.rs
.\" Troff code generated by TPS Convert from ITU Original Files
.\"                 Not Copyright ( c) 1991 
.\"
.\" Assumes tbl, eqn, MS macros, and lots of luck.
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.EN
.nr LL 40.5P
.nr ll 40.5P
.nr HM 3P
.nr FM 6P
.nr PO 4P
.nr PD 9p
.po 4P

.rs
\v | 5i'
.ce 1000
ANNEX\ D
.ce 0
.ce 1000
(to Recommendation Q.921)
.sp 9p
.RT
.ce 0
.ce 1000
\fBState transition table of the point\(hyto\(hypoint procedures\fR 
.EF '%	Fascicle\ VI.10\ \(em\ Rec.\ Q.921''
.OF '''Fascicle\ VI.10\ \(em\ Rec.\ Q.921	%'
.sp 1P
.RT
.ce 0
.ce 1000
\fBof the data link layer\fR 
.ce 0
.PP
D.1
The state transition table presented in Tables D\(hy1/Q.921 to
D\(hy3/Q.921 is based on the eight basic states (see \(sc\ B.2) recognized 
in the 
SDL representation and the related transmitter and receiver conditions.
.sp 1P
.RT
.PP
The state transition table relinquishes to any partitioning of the procedures. 
It is conceptual and does not prevent a designer from partitioning in his 
implementation. Moreover, all the processes related to primitive 
procedures, the management of queues and the exchange of information between
adjacent layers are conceptual, not visible from outside of the system and
would not impose any constraints on the implementation.
.PP
The eight basic states apply to both the transmitter and the
receiver within one data link layer entity. However, some of the conditions 
are confined to the transmitter (e.g.\ \*Qpeer receiver busy\*U), whilst 
some are 
confined to the receiver (e.g.\ \*QREJ recovery\*U). This implies, if the 
concept of non\(hypartitioning is adopted, that each transmitter condition 
has to be combined with each receiver condition resulting in composite 
states. This state 
transition table comprises 24\ composite states representing the 8\ basic 
states and the related combinations of transmitter and receiver conditions. 
.PP
Events are defined as follows:
.RT
.LP
	a)
	primitives;
.LP
	b)
	repertoire of frames to be received;
.LP
	\(em
	unnumbered frames (SABME, DISC, UA, DM, UI, FRMR)
.LP
	\(em
	supervisory frames (RR, REJ, RNR)
.LP
	\(em
	information frame (I);
.LP
	c)
	internal events (servicing of queues, expiry of timers,
receiver busy condition).
.PP
The actions to be taken when an event occurs whilst in a specific state 
comprise: 
.LP
	i)
	transition to another state
.LP
	ii)
	peer\(hyto\(hypeer frame to be transmitted
.LP
	iii)
	primitives to be issued
.LP
	iv)
	timer actions
.LP
	v)
	retry counters
.LP
	vi)
	state variables
.LP
	vii)
	P/F bit setting
.LP
	viii)
	discarding contents of queues.
.sp 2P
.LP
D.2
	\fIKey to the state transition table\fR 
.sp 1P
.RT
.sp 1P
.LP
D.2.1
	\fIDefinition of a cell of the state transition table\fR 
.sp 9p
.RT
.LP
.rs
.sp 9P
.ad r
\fBDiagram [T17.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.LP
D.2.2
	\fIKey to the contents of a cell\fR 
.sp 9p
.RT
.LP
	|
	Impossible by the definition of the data link layer service.
.LP
	/
	Impossible by the definition of the peer\(hyto\(hypeer data link
procedures.
.LP
	\(em
	No action, no state change.
.LP
	V(S) = V(A) = N(R)
	Collective term for the two actions V(S) = N(R) and   V(A) = N(R).
.LP
	Timer T200
	Start timer T200 if not already running.
.LP
	TX ACK
	The acknowledgement of the received I frame may be conveyed
by an I\ frame associated with the information flow in the
opposite direction or a supervisory response frame, as
appropriate.
.LP
	\*QDISCARD\*U
	Indicates the discarding of the information contained in
the information field of the I\ frame.
.LP
	(A\(hyO)
	The codes used in MDL\(hyERROR\(hyINDICATION signals are defined
in 
Table\ II\(hy1/Q.921 in Appendix\ II. When multiple codes are
shown, only one applies.
.LP
.rs
.sp 10P
.ad r
\fBDiagram [T18.921] + Note, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 23P
.ad r
blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [1T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (1 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving primitive\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
								
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION							See Note	
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | lw(36p) | rw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
DL\(hyESTABLISH\(hyREQUEST	 {
MDL\(hyASS\(hyIDN
 |  |
 |  |
3
\fR
 }	 |  |  |  |  |  | 3	I	 {
RC=0
TX SABME P=1
START T200
5.0
 }	I	 {
 |  |
DISC. I QUEUE 
 |  |
5.0
 }	I	I
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | rw(36p) | cw(36p) | cw(36p) .
DL\(hyRELEASE\(hyREQUEST	I	I	I	DL\(hyREL\(hyCONF	I	 |  | 5.2	I	I
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
DL\(hyDATA\(hyREQUEST	I	I	I	I	I	DATA INTO I QUEUE	I	I  
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
I FRAME IN QUEUE V(S)<V(A)+k	I	I	I	I	I	LEAVE I FRAME IN QUEUE		I
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
I FRAME IN QUEUE V(S)=V(A)+k	I	I	I	I	I			I
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
DL\(hyUNIT DATA\(hyREQUEST	 {
MDL\(hyASS\(hyIND
UNIT DATA
INTO UI QUEUE
2
 }	 {
 |  |
UNIT DATA
INTO UI QUEUE
 |  |
 }						
_
.T&
lw(54p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) .
UI FRAME IN QUEUE	I	LEAVE UI FRAME IN QUEUE		TX UI P=0				
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyASSIGN\(hyREQUEST	 {
STORE TEI
VALUE 
 |  |
 |  |
4 
 }		 {
STORE TEI VALUE
RC=0
TX SABME P=1
START T200
5.0
 }	 |  | I	 |  | I	 |  | I	 |  | I	 |  | I
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
MDL\(hyREMOVE\(hyREQUEST	I	I	I	 {
 |  |
DISC. UI QUEUE 
 |  |
 |  |
1
 }	 {
DL\(hyREL\(hyIND 
DISC. UI QUEUE 
STOP T200
 |  |
1
 }	 {
DL\(hyREL\(hyIND 
DISC. I and UI 
QUEUES
STOP T200 
1
 }	 {
DL\(hyREL\(hyCONF
DISC. I and UI 
QUEUES
STOP T200 
1
 }	 {
DL\(hyREL\(hyCONF
DISC. UI QUEUE 
STOP T200
 |  |
1
 }
_
.T&
lw(54p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyERROR\(hyRESPONSE	I	DISC. UI QUEUE  |  | 1	 {
DL\(hyREL\(hyIND
DISC. UI QUEUE
1
 }	I	I	I	I	I  
_
.T&
lw(54p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
PERSISTENT DEACTIVATION	\(em	 {
 |  |
DISC. UI QUEUE
 |  |
 |  |
1
 }	 {
DL\(hyREL\(hyIND 
DISC. UI QUEUE
 |  |
 |  |
1
 }	 |  | DISC. UI QUEUE	 {
DL\(hyREL\(hyIND 
DISC. UI QUEUE
STOP T200
 |  |
4
 }	 {
DL\(hyREL\(hyIND 
DISC. I and UI
QUEUES
STOP T200
4
 }	 {
DL\(hyREL\(hyCONF
DISC. I and UI
QUEUES
STOP T200
4
 }	 {
DL\(hyREL\(hyCONF
DISC. UI QUEUE
STOP T200
 |  |
4
 }
.TE
.LP
\fINote\ \(em\ \fR
The transmitter condition \*Qpending release\*U may occur only
in cases of layer\ 2 initiated re\(hyestablishment.
.nr PS 9
.RT
.ad r
\fBTable D\(hy1.1/Q.921 (1 of 10) [1T19.921] + Note, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (2 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) .
 {
SABME
P=1
ABLE TO ENTER STATE\ 7.0
 }	/	/	/	 {
DL\(hyEST\(hyIND
V(S,R,A)=0
TX UA F=1
START T203
7.0
 }	TX UA F=1			TX DM F=1
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=1
UNABLE TO ENTER STATE\ 7.0
 }	/	/	/	TX DM F=1	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) .
 {
SABME
P=0
ABLE TO ENTER STATE\ 7.0
 }	/	/	/	 {
DL\(hyEST\(hyIND
V(S,R,A)=0
TX UA F=0
START T203
7.0
 }	TX UA F=0			TX DM F=0
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=0
UNABLE TO ENTER STATE\ 7.0
 }	/	/	/	TX DM F=0	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=1	/	/	/	TX DM F=1	TX DM F=1			TX UA F=1
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=0	/	/	/	TX DM F=0	TX DM F=0			TX UA F=0
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
UA F=1 V(S) = V(A)	/	/	/	MDL\(hyERR\(hyIND(C)	 {
V(S,R,A)=0
DL\(hyEST\(hyCONF
STOP T200
START T203
7.0
 }	 {
V(S,R,A)=0
STOP T200
START T203
 |  |
7.0
 }	 {
DISC I QUEUE
RC=0
TX DISC P=1
RESTART T200
6
 }	 {
 |  |
DL\(hyREF\(hyCONF
STOP T200
 |  |
4
 }
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
UA F=1 V(S) \(!= V(A)	/	/	/			 {
DISC I QUEUE
V(S,R,A)=0
DL\(hyEST\(hyIND
STOP T200
START T203
7.0
 }		
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
UA F=0	/	/	/	MDL\(hyERR\(hyIND(D) 				
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
DM F=1	/	/	/	\(em	 {
DL\(hyREL\(hyIND
STOP T200
 |  |
4
 }	 {
DL\(hyREL\(hyIND
DISC I QUEUE
STOP T200
4
 }	 {
DL\(hyREL\(hyCONF
DISC I QUEUE
STOP T200
4
 }	 {
DL\(hyREL\(hyCONF
STOP T200
 |  |
4
 }
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DM
F=0
ABLE TO ENTER STATE\ 7.0
 }	/	/	/	 {
RC=0
TX SABME P=1
START T200
5.1
 }	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DM
F=0
UNABLE TO ENTER STATE\ 7.0
 }	/	/	/	\(em	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UI command	/	/	/	DL\(hyUNIT DATA\(hyIND				
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (2 of 10) [2T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (3 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving FRMR unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting SABME	/	/	/	/	\(em	\(em	\(em	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DISC	/	/	/	/	/	/	/	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting UA	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DM	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting I command
 }	/	/	/	/	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting S frame
 }	/	/	/	/	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting FRMR	/	/	/	/	/	/	/	/  
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (3 of 10) [3T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [4T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (4 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RR command P=1	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RR command P=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RR response F=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RR response F=1	/	/	/	\(em	\(em	\(em	\(em	\(em    
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (4 of 10) [4T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [5T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (5 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving REJ supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
REJ command P=1	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
REJ command P=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
REJ response F=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
REJ response F=1	/	/	/	\(em	\(em	\(em	\(em	\(em    
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (5 of 10) [5T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [6T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (6 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RNR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RNR command P=1	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RNR command P=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RNR response F=0	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RNR response F=1	/	/	/	\(em	\(em	\(em	\(em	\(em    
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (6 of 10) [6T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [7T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (7 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBacknowledging all outstanding\fR
\fBI frames or containing an N(R) which satisfies\fR
\fBV(A) | (= | (R) | (= | (S)\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) = V(S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) = V(S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) = V(S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
N(R) = V(S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A) | (= | (R) | (= | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A) | (= | (R) | (= | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A) | (= | (R) | (= | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A) | (= | (R) | (= | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (7 of 10) [7T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [8T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (8 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBcontaining an N(R)\fR
\fBwhich satisfies V(A) |  | (R) |  | (S), or an N(R) error\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A) |  | (R) |  | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A) |  | (R) |  | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) error
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) error
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) error
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
N(R) error
 }	/	/	/	\(em	\(em	\(em	\(em	\(em
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (8 of 10) [8T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [9T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy1/Q.921 (9 of 10)
.T&
cw(342p) .
 {
\fBState transition table: Internal events (expiry of\fR
\fBtimers, receiver busy condition)\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) .
T200 TIME\(hyOUT RC < | 200	/	/	/	/	 {
RC=RC+1
TX SABME P=1
START T200
 }			 {
RC=RC+1
TX DISC P=1
START T200
 }
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
T200 TIME\(hyOUT RC = N200	/	/	/	/	 {
 |  |
DL\(hyREL\(hyIND
MDL\(hyERR\(hyIND(G)
4
 }	 {
DISC I QUEUE
DL\(hyREL\(hyIND
MDL\(hyERR\(hyIND(G)
4
 }	 {
DISC I QUEUE
DL\(hyREL\(hyCONF
MDL\(hyERR\(hyIND(G)
4
 }	 {
 |  |
DL\(hyREL\(hyCONF
MDL\(hyERR\(hyIND(H)
4
 }
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
T203 TIME\(hyOUT	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SET OWN RECEIVER BUSY (Note)	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
CLEAR
OWN RECEIVER BUSY (Note)
 }	/	/	/	/	/	/	/	/
.TE
.LP
\fINote\ \(em\ \fR
These signals are generated outside the procedures specified
in this state transition table, and may be generated by the
connection management entity.
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (9 of 10) [9T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [10T19.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy1/Q.921 (10 of 10)
 }
.T&
cw(342p) .
 {
\fBState transition table: Receiving frame with incorrect format\fR
\fBor frame not implemented\fR
 }
.TE
.TS
cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) .
BASIC STATE  	TEI UNASSIGNED  	ASSIGN AWAITING TEI  	ESTABLISH AWAITING TEI  	TEI ASSIGNED  	AWAITING ESTABLISHMENT  	AWAITING RELEASE
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
TRANSMITTER CONDITION					Establish	Re\(hyestablish \fR  	Pending release	
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) .
RECEIVER CONDITION								
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	1	2	3	4	5.0	5.1	5.2	6
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME incorrect length	/	/	/	MDL\(hyERR\(hyIND(N)				
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC incorrect length	/	/	/					
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA incorrect length	/	/	/					
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM incorrect length	/	/	/					
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR incorrect length	/	/	/					
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Supervisory frame
RR, REJ, RNR
incorrect length
 }	/	/	/					
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
N201 error	/	/	/	MDL\(hyERR\(hyIND(O)				
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Undefined command and response frames
 }	/	/	/	MDL\(hyERR\(hyIND(L)				
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
I field not permitted	/	/	/	MDL\(hyERR\(hyIND(M)				
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy1/Q.921 (10 of 10) [10T19.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [1T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (1 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving primitive\fR
 }
.T&
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DL\(hyESTABLISH\(hyREQUEST
 |  |
 }	 {
DISC I QUEUE
RC=0
TX SABME P=1
STOP T203
RESTART T200
5.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DL\(hyRELEASE\(hyREQUEST
 |  |
 }	 {
DISC I QUEUE
RC=0
TX DISC P=1
STOP T203
RESTART T200
6.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DL\(hyDATA\(hyREQUEST	DATA INTO I QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I FRAME IN QUEUE
V(S) |  | (A)+k
 }	 {
TX I P=0
V(S)=V(S)+1
STOP T203
TIMER T200
 }				LEAVE I FRAME IN QUEUE			
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
I FRAME IN QUEUE V(S)=V(A)+k	LEAVE I FRAME IN QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
DL\(hyUNIT DATA\(hyREQUEST	UNIT DATA INTO UI QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
UI FRAME IN QUEUE	TX UI P=0							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyASSIGN\(hyREQUEST	I							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
MDL\(hyREMOVE\(hyREQUEST
 |  |
 }	 {
DL\(hyREL\(hyIND
DISC I and UI QUEUES
STOP T200
STOP T203
1
 }							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyERROR\(hyRESPONSE	I							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
PERSISTENT DEACTIVATION  |  |	 {
DL\(hyREL\(hyIND
DISC I and UI QUEUES
STOP T200
STOP T203
4
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (1 of 10) [1T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (2 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving unnumbered frame\fR
\fBwith correct format\fR
 }
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME P=1 V(S) = V(A)  |  |	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=1
STOP T200
START T203
 |  |
 }	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=1
STOP T200
START T203
7.0
 }						
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=1
V(S) \(!= V(A)
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC I QUEUE
V(S,R,A)=0
TX UA F=1 
STOP T200
START T203
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC I QUEUE
V(S,R,A)=0
TX UA F=1 
STOP T200
START T203
7.0
 }						
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME P=0 V(S) = V(A)  |  |	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=0
STOP T200
START T203
 |  |
 }	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=0
STOP T200
START T203
7.0
 }						
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=0
V(S) \(!= V(A)
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC I QUEUE
V(S,R,A)=0
TX UA F=0 
STOP T200
START T203
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC I QUEUE
V(S,R,A)=0
TX UA F=0 
STOP T200
START T203
7.0
 }						
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=1  |  |	 {
DL\(hyREL\(hyIND
DISC I QUEUE
TX UA F=1
STOP T200,
T203
4
 }							
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=0  |  |	 {
DL\(hyREL\(hyIND
DISC I QUEUE
TX UA F=0
STOP T200,
T203
4
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (2 of 10) [2T.20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy2/Q.921 (2 of 10 \fIcont.\fR
)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA F=1	MDL\(hyERR\(hyIND(C)							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA F=0	MDL\(hyERR\(hyIND(D)							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM F=1	MDL\(hyERR\(hyIND(B)							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM F=0  |  |	 {
MDL\(hyERR\(hyIND(E)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(E)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
UI\ command	DL\(hyUNIT DATA\(hyIND							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (2 of 10 cnt'd) [3T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [4T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (3 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving FRMR unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting SABME	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DISC	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting UA
 |  |
 }	 {
MDL\(hyERR\(hyIND(K)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(K)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DM	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting I command
 |  |
 }	 {
MDL\(hyERR\(hyIND(K)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(K)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting S frame
 }								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting FRMR	/	/	/	/	/	/	/	/
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (3 of 10) [4T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [5T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (4 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
N(R)=V(S)
 |  |
 }	 {
TX RR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }		 {
TX RNR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }		 {
TX RR F=1
STOP T200
START T203
V(A)=N(R)
7.0
 }	 {
TX RR F=1
STOP T200
START T203
V(A)=N(R)
7.1
 }	 {
TX RNR F=1
STOP T200
START T203
V(A)=N(R)
7.2
 }	 {
TX RNR F=1
STOP T200
START T203
V(A)=N(R)
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=0
N(R)=V(S)
 |  |
 }	 {
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }				 {
STOP T200
START T203
V(A)=N(R)
7.0
 }	 {
STOP T200
START T203
V(A)=N(R)
7.1
 }	 {
STOP T200
START T203
V(A)=N(R)
7.2
 }	 {
STOP T200
START T203
V(A)=N(R)
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RR response F=0 N(R)=V(S)								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=1
N(R)=V(S)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }				 {
MDL\(hyERR\(hyIND(A)
STOP T200
START T203
V(A)=N(R)
7.0
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T200
START T203
V(A)=N(R)
7.1
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T200
START T203
V(A)=N(R)
7.2
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T200
START T203
V(A)=N(R)
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
 |  |
 }		 {
TX RNR F=1
RESTART T200
V(A)=N(R)
 |  |
 }		 {
TX RR F=1
RESTART T200
V(A)=N(R)
7.0
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
7.1
 }	 {
TX RNR F=1
RESTART T200
V(A)=N(R)
7.2
 }	 {
TX RNR F=1
RESTART T200
V(A)=N(R)
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=0
V(A) \(= N(R) < V(S)
 |  |
 }	RESTART T200 V(A)=N(R)  |  |				RESTART T200 V(A)=N(R) 7.0	RESTART T200 V(A)=N(R) 7.1	RESTART T200 V(A)=N(R) 7.2	RESTART T200 V(A)=N(R) 7.3
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=0
V(A) \(= N(R) < V(S)
 }								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
 |  |
 }				 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.0
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.1
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.2
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.3
 }
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (4 of 10) [5T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [6T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy2/Q.921 (4 of 10 \fIcont.\fR
)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving RR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
V(A) = N(R) < V(S)
 }	TX RR F=1  |  |		TX RNR F=1  |  |		TX RR F=1 7.0	TX RR F=1 7.1	TX RNR F=1 7.2	TX RNR F=1 7.3  
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | rw(36p) | rw(36p) | rw(36p) | rw(36p) .
 {
RR command
P=0
V(A) = N(R) < V(S)
 |  |
 }	\(em	\(em	\(em	\(em	7.0	7.1	7.2	7.3
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | rw(36p) | rw(36p) | rw(36p) | rw(36p) .
 {
RR command
F=0
V(A) = N(R) < V(S)
 }	\(em	\(em	\(em	\(em				
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=1
V(A) = N(R) < V(S)
 }	MDL\(hyERR\(hyIND(A)  |  |				MDL\(hyERR\(hyIND(A) 7.0	MDL\(hyERR\(hyIND(A) 7.1	MDL\(hyERR\(hyIND(A) 7.2	MDL\(hyERR\(hyIND(A) 7.3  
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }			 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }				
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RR response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=1
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }			 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }				
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (4 of 10 cnt'd) [6T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [7T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (5 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving REJ supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=1
N(R)=V(S)\ (Note)
 |  |
 }	 {
TX RR F=1
V(A)=N(R)
STOP T200
RESTART T203
 |  |
 }		 {
TX RNR F=1
V(A)=N(R)
STOP T200
RESTART T203
 |  |
 }		 {
TX RR F=1
V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
TX RR F=1
V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
TX RNR F=1
V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
TX RNR F=1
V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=0
N(R)=V(S)\ (Note)
 |  |
 }	 {
V(A)=N(R)
STOP T200
RESTART T203
 |  |
 }				 {
V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=0
N(R)=V(S)\ (Note)
 }								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=1
N(R)=V(S)\ (Note)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
V(A)=N(R)
STOP T200
RESTART T203
 |  |
 }				 {
MDL\(hyERR\(hyIND(A)
V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
MDL\(hyERR\(hyIND(A)
V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
MDL\(hyERR\(hyIND(A)
V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
MDL\(hyERR\(hyIND(A)
V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
TX RR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
 |  |
 }		 {
TX RNR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
 |  |
 }		 {
TX RR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
TX RR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
TX RNR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
TX RNR F=1
V(S)=V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=0
V(A) \(= N(R) < V(S)
 |  |
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
 |  |
 }				 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=0
V(A) \(= N(R) < V(S)
 }								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
V(S)=V(A)=N(R)
STOP T200
START T203
 |  |
 }				 {
MDL\(hyERR\(hyIND(A)
V(S)=V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
MDL\(hyERR\(hyIND(A)
V(S)=V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
MDL\(hyERR\(hyIND(A)
V(S)=V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
MDL\(hyERR\(hyIND(A)
V(S)=V(A)=N(R)
STOP T200
START T203
7.3
 }
\fINote\ \(em\ \fR
This event is impossible by the definition of the peer\(hyto\(hypeer
data link procedures. However, it would not harm the information
transfer, if actions according to this table are taken.
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (5 of 10) [7T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [8T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy2/Q.921 (5 of 10 \fIcont.\fR
)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving REJ supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC. BUSY	REJ and own REC. busy	NORMAL	REJ RECOVERY	OWN REC. BUSY	REJ and own REC. busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
REJ command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
REJ command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
REJ response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
REJ response
F=1
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (5 of 10 cnt'd) [8T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [9T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (6 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RNR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=1
N(R)=V(S)
 |  |
 }	 {
TX RR F=1
STOP T203
RESTART T200
V(A)=N(R)
7.4
 }	 {
TX RR F=1
STOP T203
RESTART T200
V(A)=N(R)
7.5
 }	 {
TX RNR F=1
STOP T203
RESTART T200
V(A)=N(R)
7.6
 }	 {
TX RNR F=1
STOP T203
RESTART T200
V(A)=N(R)
7.7
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
 |  |
 |  | \fR
 }		 {
TX RNR F=1
RESTART T200
V(A)=N(R)
 |  |
 |  | \fR
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=0
N(R)=V(S)
 |  |
 }	 {
STOP T203
RESTART T200
V(A)=N(R)
7.4
 }	 {
STOP T203
RESTART T200
V(A)=N(R)
7.5
 }	 {
STOP T203
RESTART T200
V(A)=N(R)
7.6
 }	 {
STOP T203
RESTART T200
V(A)=N(R)
7.7
 }	 {
RESTART T200
V(A)=N(R)
 |  |
 |  |
 }			
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
RNR response F=0 N(R)=V(S)								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR response
F=1
N(R)=V(S)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T203
RESTART T200
V(A)=N(R)
7.4
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T203
RESTART T200
V(A)=N(R)
7.5
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T203
RESTART T200
V(A)=N(R)
7.6
 }	 {
MDL\(hyERR\(hyIND(A)
STOP T203
RESTART T200
V(A)=N(R)
7.7
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
 |  |
7.6
 }			
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
7.4
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
7.5
 }	 {
TX RNR F=1
RESTART T200
V(A)=N(R)
7.6
 }	 {
TX RNR F=1
RESTART T200
V(A)=N(R)
7.7
 }	 {
TX RR F=1
RESTART T200
V(A)=N(R)
 |  |
 }		 {
TX RNR F=1
RESTART T200
V(A)=N(R)
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=0
V(A) \(= N(R) < V(S)
 |  |
 }	RESTART T200 V(A)=N(R) 7.4	RESTART T200 V(A)=N(R) 7.5	RESTART T200 V(A)=N(R) 7.6	RESTART T200 V(A)=N(R) 7.7	RESTART T200 V(A)=N(R)  |  |			
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR response
F=0
V(A) \(= N(R) < V(S)
 }								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR response
F=1
V(A) \(= N(R) < V(S)
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.4
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.5
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.6
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
7.7
 }	 {
MDL\(hyERR\(hyIND(A)
RESTART T200
V(A)=N(R)
 |  |
 }			
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (6 of 10) [9T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [10T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy2/Q.921 (6 of 10 \fIcont.\fR
)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving RNR supervisory frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
RNR response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR response
F=1
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }				 {
MDL\(hyERR\(hyIND(A)
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }			
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (6 of 10 cnt'd) [10T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [11T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (7 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBacknowledging all outstanding\fR
\fBI frames or containing an N(R) which satisfies\fR
\fBV(A) |  | (R) |  | (S)\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) = V(S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
STOP T200
RESTART T203
V(A)=N(R)
7.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
 |  |
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
 |  |
7.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) = V(S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
STOP T200
RESTART T203
V(A)=N(R)
7.0
 }	 {
\*QDISCARD\*U
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
 |  |
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
 |  |
7.4
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) = V(S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
STOP T200
RESTART T203
V(A)=N(R)
7.1
 }	 {
\*QDISCARD\*U
TX RR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 }		 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
 |  |
 |  |
7.5
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 |  |
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
N(R) = V(S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
STOP T200
RESTART T203
V(A)=N(R)
7.1
 }	 {
\*QDISCARD\*U
STOP T200
RESTART T203
V(A)=N(R)
 |  |
 |  |
 }			 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
 |  |
 |  |
7.5
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 |  |
 }		
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
RESTART T200
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
RESTART T200
V(A)=N(R)
7.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
RESTART T200
V(A)=N(R)
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
7.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
RESTART T200
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
RESTART T200
V(A)=N(R)
7.0
 }	 {
\*QDISCARD\*U
RESTART T200
V(A)=N(R)
 |  |
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
7.4
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
RESTART T200
V(A)=N(R)
7.1
 }	 {
\*QDISCARD\*U
TX RR F=1
RESTART T200
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
RESTART T200
V(A)=N(R)
 |  |
 }		 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
 |  |
7.5
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=0
RESTART T200
V(A)=N(R)
7.1
 }	 {
\*QDISCARD\*U
RESTART T200
V(A)=N(R)
 |  |
 |  |
 }			 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
 |  |
7.5
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 }		
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (7 of 10) [11T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [12T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (8 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBcontaining an N(R) which satisfies\fR
\fB V(A) |  | (R) |  | (S), or an N(R) error\fR
\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A)=N(R) |  | (S)
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
7.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
7.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A)=N(R) |  | (S)
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
7.0
 }	 {
\*QDISCARD\*U
 |  |
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
7.4
 }	 {
\*QDISCARD\*U
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A)=N(R) |  | (S)
 }	\*QDISCARD\*U TX REJ F=1 7.1	\*QDISCARD\*U TX RR F=1  |  |	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 }		\*QDISCARD\*U TX REJ F=1 7.5	\*QDISCARD\*U TX RR F=1  |  |	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A)=N(R) |  | (S)
 }	\*QDISCARD\*U TX REJ F=0 7.1	\*QDISCARD\*U  |  |  |  |			\*QDISCARD\*U TX REJ F=0 7.5	\*QDISCARD\*U  |  |  |  |		
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) error
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
 |  |
5.1
 }		 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) error
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
 |  |
5.1
 }		 {
V(R)=V(R)+1
DL=DATA=IND
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
\*QDISCARD\*U
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) error
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
TX REJ F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	 {
\*QDISCARD\*U
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
N(R) error
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=0
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
 |  |
5.1
 }			 {
\*QDISCARD\*U
TX REJ F=0
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	 {
\*QDISCARD\*U
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
 |  |
5.1
 }		
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (8 of 10) [12T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [13T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy2/Q.921 (9 of 10)
.T&
cw(342p) .
 {
\fBState transition table: internal events (expiry of timers,
\fB receiver busy condition)\fR
\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
T200 TIME\(hyOUT
RC < | 200
 |  |
 }	 {
RC=0
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RR P=1
then
RC=RC+1
START T200
8.0
 }	 {
RC=0
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RR P=1
then
RC=RC+1
START T200
8.1
 }	 {
RC=0
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RNR P=1
then
RC=RC+1
START T200
8.2
 }	 {
RC=0
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RNR P=1
then
RC=RC+1
START T200
8.3
 }	 {
RC=0
TX RR P=1
RC=RC+1
START T200
8.4
 }	 {
RC=0
TX RR P=1
RC=RC+1
START T200
8.5
 }	 {
RC=0
TX RNR P=1
RC=RC+1
START T200
8.6
 }	 {
RC=0
TX RNR P=1
RC=RC+1
START T200
8.7
 }
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
T200 TIME\(hyOUT
RC = N200
 |  |
 }	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
T203 TIME\(hyOUT  |  |	RC=0 TX RR P=1 START T200 8.0	RC=0 TX RR P=1 START T200 8.1	 {
RC=0
TX RNR P=1
START T200
8.2
 }	 {
RC=0
TX RNR P=1
START T200
8.3
 }	/	/	/	/
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) .
SET OWN RECEIVER BUSY (Note)	TX RNR F=0 7.2	TX RNR F=0 7.3	\(em	\(em	TX RNR F=0 7.6	TX RNR F=0 7.7	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) .
 {
CLEAR
OWN RECEIVER BUSY (Note)
 }	\(em	\(em	TX RR F=0 7.0	TX RR F=0 7.1	\(em	\(em	TX RR F=0 7.4	 {
TX RR F=0
7.5
 }
.TE
.LP
\fINote\ \(em\ \fR
These signals are generated outside the procedures specified
in this state transition table, and may be generated by the
connection management entity.
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (9 of 10) [13T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [14T20.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy2/Q.921 (10 of 10)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving frame with incorrect\fR
\fBformat or frame not implemented\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	MULTIPLE FRAME ESTABLISHED
.TE
.TS
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	7.0	7.1	7.2	7.3	7.4	7.5	7.6	7.7
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME incorrect length  |  |	 {
MDL\(hyERR\(hyIND(N)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Supervisory frame
RR, REJ, RNR
incorrect length
 }								
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
N201 error  |  |	 {
MDL\(hyERR\(hyIND(0)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Undefined command and response frames
 |  |
 }	 {
MDL\(hyERR\(hyIND(L)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
I field not permitted  |  |	 {
MDL\(hyERR\(hyIND(M)
RC = 0
TX SABME P=1
STOP T203
RESTART T200
5.1
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy2/Q.921 (10 of 10) [14T20.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [1T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (1 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving primitive\fR
 }
.T&
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DL\(hyESTABLISH\(hyREQUEST
 |  |
 }	 {
DISC. I QUEUE
RC=0
TX SABME P=1
RESTART T200
5.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
DL\(hyRELEASE\(hyREQUEST
 |  |
 }	 {
DISC. I QUEUE
RC=0
TX DISC P=1
RESTART T200
6
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DL\(hyDATA\(hyREQUEST	DATA INTO I QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
I FRAME IN QUEUE
V(S) |  | (A)+k
 }	LEAVE I FRAME IN QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
I FRAME IN QUEUE V(S)=V(A)+k								
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DL\(hyUNIT DATA\(hyREQUEST	UNIT DATA INTO UI QUEUE							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UI FRAME IN QUEUE	TX UI P=0							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyASSIGN\(hyREQUEST	I							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
MDL\(hyREMOVE\(hyREQUEST
 |  |
 }	 {
DL\(hyREL\(hyIND
DISC. I and UI QUEUES
STOP T200
1
 }							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
MDL\(hyERROR\(hyRESPONSE	I							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
PERSISTENT DEACTIVATION  |  |	 {
DL\(hyREL\(hyIND
DISC. I and UI QUEUES
STOP T200
4
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (1 of 10) [1T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [2T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (2 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME P=1 V(S) = V(A)  |  |	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=1
STOP T200
START T203
7.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=1
V(S) \(!= V(A)
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC. I QUEUE
V(S,R,A)=0
TX UA F=1 
STOP T200
START T203
7.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME P=0 V(S) = V(A)  |  |	 {
MDL\(hyERR\(hyIND(F)
V(S,R,A)=0
TX UA F=0
STOP T200
START T203
7.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
SABME
P=0
V(S) \(!= V(A)
 |  |
 }	 {
DL\(hyEST\(hyIND
MDL\(hyERR\(hyIND(F)
DISC. I QUEUE
V(S,R,A)=0
TX UA F=0 
STOP T200
START T203
7.0
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=1  |  |	 {
DL\(hyREL\(hyIND
DISC. I QUEUE
TX UA F=1
STOP T200
4
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC P=0  |  |	 {
DL\(hyREL\(hyIND
DISC. I QUEUE
TX UA F=0
STOP T200
4
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (2 of 10) [2T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [3T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy3/Q.921 (2 of 10 \fIcont.\fR
)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA F=1	MDL\(hyERR\(hyIND(C)							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA F=0	MDL\(hyERR\(hyIND(D)							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM F=1  |  |	 {
MDL\(hyERR\(hyIND(B)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM F=0  |  |	 {
MDL\(hyERR\(hyIND(E)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UI\ command	DL\(hyUNIT DATA\(hyIND							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (2 of 10 cnt'd) [3T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [4T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (3 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving FRMR unnumbered frame\fR
\fBwith correct format\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting SABME	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DISC	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting UA	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting DM	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting I command
 |  |
 }	 {
MDL\(hyERR\(hyIND(K)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
FRMR response
rejecting S frame
 }								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR response rejecting FRMR	/	/	/	/	/	/	/	/
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (3 of 10) [4T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [5T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (4 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RR supervisory frame\fR
\fBwith correct format, clearance of timer recovery\fR
\fBif there is F\ =\ 1\ only\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
V(A) \(= N(R) \(= V(S)
 |  |
 }	TX RR F=1 V(A)=N(R)  |  |		TX RNR F=1 V(A)=N(R)  |  |		TX RR F=1 V(A)=N(R) 8.0	TX RR F=1 V(A)=N(R) 8.1	TX RNR F=1 V(A)=N(R) 8.2	TX RNR F=1 V(A)=N(R) 8.3  
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=0
V(A) \(= N(R) \(= V(S)
 }	V(A)=N(R)  |  |				V(A)=N(R) 8.0	V(A)=N(R) 8.1	V(A)=N(R) 8.2	V(A)=N(R) 8.3
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=0
V(A) \(= N(R) \(= V(S)
 }								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR response
F=1
V(A) \(= N(R) \(= V(S)
 |  |
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.0
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.1
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.2
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.3
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.0
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.1
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.2
 }	 {
V(S)=N(R)
STOP T200
START T203
V(A)=N(R)
7.3
 }
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RR command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RR response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RR response F=1 N(R) error								
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (4 of 10) [5T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [6T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (5 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving REJ supervisory frame\fR
\fBwith correct format, clearance of timer recovery\fR
\fBif there is F\ =\ 1\ only\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=1
V(A) \(= N(R) \(= V(S)
 }	TX RR F=1 V(A)=N(R)		TX RNR F=1 V(A)=N(R)		TX RR F=1 V(A)=N(R) 8.0	TX RR F=1 V(A)=N(R) 8.1	TX RNR F=1 V(A)=N(R) 8.2	TX RNR F=1 V(A)=N(R) 8.3  
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=0
V(A) \(= N(R) \(= V(S)
 }	V(A)=N(R)				V(A)=N(R) 8.0	V(A)=N(R) 8.1	V(A)=N(R) 8.2	V(A)=N(R) 8.3
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=0
V(A) \(= N(R) \(= V(S)
 }								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ response
F=1
V(A) \(= N(R) \(= V(S)
 |  |
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.3
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.0
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.1
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.2
 }	 {
V(S)=V(A)=N(R)
STOP T200
START T203
7.3
 }
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
REJ command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
REJ response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
REJ response F=1 N(R) error								
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (5 of 10) [6T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [7T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (6 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving RNR supervisory frame\fR
\fBwith correct format, clearance of timer recovery\fR
\fBif there is F\ =\ 1\ only\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=1
V(A) \(= N(R) \(= V(S)
 }	TX RR F=1 V(A)=N(R) 8.4	TX RR F=1 V(A)=N(R) 8.5	TX RNR F=1 V(A)=N(R) 8.6	TX RNR F=1 V(A)=N(R) 8.7	TX RR F=1 V(A)=N(R)		TX RNR F=1 V(A)=N(R)	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR command
P=0
V(A) \(= N(R) \(= V(S)
 }	V(A)=N(R) 8.4	V(A)=N(R) 8.5	V(A)=N(R) 8.6	V(A)=N(R) 8.7	V(A)=N(R)			
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .
 {
RNR response
F=0
V(A) \(= N(R) \(= V(S)
 }								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RNR response
F=1
V(A) \(= N(R) \(= V(S)
 |  |
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.4
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.5
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.6
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.7
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.4
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.5
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.6
 }	 {
V(S)=N(R)
RESTART T200
V(A)=N(R)
7.7
 }
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RNR command
P=1
N(R) error
 |  |
 }	 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }		 {
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
 {
RNR command
P=0
N(R) error
 |  |
 }	 {
MDL\(hyERR\(hyIND(J)
RC =0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RNR response F=0 N(R) error								
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .
RNR response F=1 N(R) error								
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (6 of 10) [7T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [8T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (7 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBacknowledging all outstanding I frames or containing\fR
\fBan N(R) which satisfies V(A) |  | (R) |  | (S); no clearance\fR
\fB of timer recovery\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) = V(S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
V(A)=N(R)
8.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
8.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) = V(S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
V(A)=N(R)
8.0
 }	 {
\*QDISCARD\*U
 |  |
V(A)=N(R)
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
8.4
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) = V(S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
8.1
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 }		 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
8.5
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
N(R) = V(S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
8.1
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 }			 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
8.5
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 }		
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
V(A)=N(R)
8.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
V(A)=N(R)
8.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
V(A)=N(R)
8.0
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
V(A)=N(R)
8.4
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
8.1
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 }		 {
\*QDISCARD\*U
TX REJ F=1
V(A)=N(R)
8.5
 }	 {
\*QDISCARD\*U
TX RR F=1
V(A)=N(R)
 |  |
 }	 {
\*QDISCARD\*U
TX RNR F=1
V(A)=N(R)
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A) |  | (R) |  | (S)
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
8.1
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 }			 {
\*QDISCARD\*U
TX REJ F=0
V(A)=N(R)
8.5
 }	 {
\*QDISCARD\*U
V(A)=N(R)
 |  |
 |  |
 }		
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (7 of 10) [8T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [9T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (8 of 10)
.T&
cw(342p) .
 {
\fBState transition table: receiving I command frame with correct format\fR
\fBcontaining an N(R) which satisfies\fR
\fB V(A) |  | (R) |  | (S), or an N(R) error\fR
\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
V(A)=N(R) |  | (S)
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
8.0
 }	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=1
8.4
 }	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
V(A)=N(R) |  | (S)
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX ACK
8.0
 }	 {
\*QDISCARD\*U
 |  |
 |  |
 |  |
 }		 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
 |  |
 }	 {
V(R)=V(R)+1
DL\(hyDATA\(hyIND
TX RR F=0
8.4
 }	 {
\*QDISCARD\*U
 |  |
 |  |
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
V(A)=N(R) |  | (S)
 }	\*QDISCARD\*U TX REJ F=1 8.1	\*QDISCARD\*U TX RR F=1  |  |	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 }		\*QDISCARD\*U TX REJ F=1 8.5	\*QDISCARD\*U TX RR F=1  |  |	 {
\*QDISCARD\*U
TX RNR F=1
 |  |
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) \(!= V(R)
V(A)=N(R) |  | (S)
 }	\*QDISCARD\*U TX REJ F=0 8.1	\*QDISCARD\*U  |  |  |  |			\*QDISCARD\*U TX REJ F=0 8.5	\*QDISCARD\*U  |  |  |  |		
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) = V(R)
N(R) error
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
V(R)=V(R)+1
DL=DATA=IND
TX RR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=0
N(S) = V(R)
N(R) error
 |  |
 }	 {
V(R)=V(R)+1
DL=DATA=IND
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }		 {
V(R)=V(R)+1
DL=DATA=IND
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
MDL\(hyERR\(hyINJ(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
I command\ \ \ P=1
N(S) \(!= V(R)
N(R) error
 |  |
 }	 {
\*QDISCARD\*U
TX REJ F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }		 {
\*QDISCARD\*U
TX REJ F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX RNR F=1
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	
_
.T&
lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .
 {
\*QDISCARD\*U
TX REJ F=0
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
TX REJ F=0
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }				 {
\*QDISCARD\*U
TX REJ F=0
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }	 {
\*QDISCARD\*U
MDL\(hyERR\(hyIND(J)
RC = 0
TX SABME P=1
RESTART T200
 |  |
5.1
 }	
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (8 of 10) [9T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [10T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
TABLE\ D\(hy3/Q.921 (9 of 10)
.T&
cw(342p) .
 {
\fBState transition table: internal events (expiry of timers,
\fB receiver busy condition); initiation of a re\(hyestablishment procedure\fR
\fBif the value of the retransmission count variable is equal to N200\fR
\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) .
 {
T200 TIME\(hyOUT
RC < | 200
V(A) < V(S)
 |  |
 }	 {
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RR P=1
then
RC=RC+1
START T200
 }		 {
either
V(S)=V(S)\(em1
TX I P=1
V(S)=V(S)+1
or
TX RNR P=1
then
RC=RC+1
START T200
 }		 {
TX RR P=1
RC=RC+1
START T200
 |  |
 |  | 
 |  | 
 |  | 
 |  |
 }	 {
TX RNR P=1
RC=RC+1
START T200
 |  |
 |  | 
 |  | 
 |  | 
 |  |
 }		
_
.T&
lw(54p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) .
 {
T200 TIME\(hyOUT
RC < | 200
V(A) = V(S)
 }	 {
TX RR P=1
RC = RC+1
START T200
 }		 {
TX RR P=1
RC = RC+1
START T200
 }					
_
.T&
lw(54p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) .
 {
T200 TIME\(hyOUT
RC = N200
 |  |
 }	 {
MDL\(hyERR\(hyIND(I)
RC=0
TX SABME P=1
START T200
5.1
 }							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
T203 TIME\(hyOUT	/	/	/	/	/	/	/	/
_
.T&
lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) .
SET OWN RECEIVER BUSY (Note)	TX RNR F=0 8.2	TX RNR F=0 8.3	\(em	\(em	TX RNR F=0 8.6	TX RNR F=0 8.7	\(em	\(em
_
.T&
lw(54p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) .
 {
CLEAR
OWN RECEIVER BUSY (Note)
 }	\(em	\(em	TX RR F=0 8.0	TX RR F=0 8.1	\(em	\(em	TX RR F=0 8.4	TX RR F=0 8.5
.TE
.LP
\fINote\ \(em\ \fR
These signals are generated outside the procedures specified
in this state transition table, and may be generated by the
connection management entity.
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (9 of 10) [10T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [11T21.921]\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(342p) .
 {
TABLE\ D\(hy3/Q.921 (10 of 10)
 }
.T&
cw(342p) .
 {
\fBState transition table: receiving frame with incorrect\fR
\fBformat or frame not implemented\fR
 }
.TE
.TS
center box ;
cw(54p) | cw(288p) .
BASIC STATE	TIMER RECOVERY
.TE
.TS
center box ;
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
TRANSMITTER CONDITION	NORMAL	NORMAL	NORMAL	NORMAL	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY	PEER REC BUSY
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
RECEIVER CONDITION	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy	NORMAL	REJ RECOVERY	OWN REC BUSY	REJ and own REC busy
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
STATE NUMBER\fR	8.0	8.1	8.2	8.3	8.4	8.5	8.6	8.7
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
SABME incorrect length  |  |	 {
MDL\(hyERR\(hyIND(N)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DISC incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
UA incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
DM incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
FRMR incorrect length  								
_
.T&
lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Supervisory frame
RR, REJ, RNR
incorrect length
 }								
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
N201 error  |  |	 {
MDL\(hyERR\(hyIND(0)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
 {
Undefined command and response frames
 |  |
 }	 {
MDL\(hyERR\(hyIND(L)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.T&
lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .
I field not permitted  |  |	 {
MDL\(hyERR\(hyIND(M)
RC = 0
TX SABME P=1
RESTART T200
5.1
 }							
_
.TE
.nr PS 9
.RT
.ad r
\fBTable D\(hy3/Q.921 (10 of 10) [11T21.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce 1000
APPENDIX\ I
.ce 0
.ce 1000
(to Recommendation Q.921)
.sp 9p
.RT
.ce 0
.sp 1P
.ce 1000
\fBRetransmission of REJ response frames\fR 
.sp 1P
.RT
.ce 0
.sp 1P
.LP
I.1
	\fIIntroduction\fR 
.sp 1P
.RT
.PP
This appendix describes an optional procedure which may be used to provide 
a reject retransmission procedure. 
.RT
.sp 2P
.LP
I.2
	\fIProcedure\fR 
.sp 1P
.RT
.PP
This optional reject retransmission procedure can supplement the
Q.921 LAPD protocol by defining a new variable for multiple frame operation
(\(sc\ 3.5.2), and by modifying the N(S) sequence error exception condition
reporting and recovery (\(sc\ 5.8.1).
.RT
.sp 1P
.LP
I.2.1
	\fIRecovery state variable V(M)\fR 
.sp 9p
.RT
.PP
Each point\(hyto\(hypoint data link entity may have an associated V(M)
when using I\ frame commands and supervisory frame commands/responses. V(M)
denotes the sequence number of the last frame received which caused an N(S)
sequence error condition. V(M) can take on the value\ 0 to 127 and may be
used to determine if another REJ response frame should be sent on receipt 
of an N(S) sequence error while in the REJ exception condition. 
.RT
.sp 1P
.LP
I.2.2
	\fIN(S) sequence error supplementary procedure\fR 
.sp 9p
.RT
.PP
The first three paragraphs of \(sc\ 5.8.1, N(S) sequence error,
apply. The remainder of the section if as follows:
.PP
The REJ frame is used by a receiving data link layer entity to
initiate an exception recovery (retransmission) following the detection 
of an N(S) sequence error. The receiving data link entity shall set V(M) 
to the N(S) sequence number which caused the N(S) sequence error condition. 
.PP
Only one REJ exception condition for a given direction of information transfer 
shall be established at a time [that is, all REJ frames must have the same 
N(R) value until the REJ reception is cleared]. 
.PP
A data link layer entity receiving an REJ command or response shall
initiate sequential transmission (retransmission) of I\ frames starting 
with the I\ frame indicated by the N(R) contained in the REJ frame. 
.PP
A REJ exception is cleared when the requested I\ frame is received or when 
SABME, or DISC is received. 
.PP
If an N(S) sequence error exception occurs when the receiving data
link layer entity is in the REJ exception condition, then check the N(S) 
of the received frame to see if the data link layer entity which received 
the REJ 
frame has retransmitted in response to the REJ frame [i.e.,\ is N(S) within
the range V(R)\ +\ 1\ \(=\ N(S)\ \(=\ V(M)]. If the N(S) of the received 
frame is within the above range, then send another REJ response frame, 
issue an 
MDL\(hyERROR\(hyINDICATION primitive to the connection management entity, 
and set 
V(M) equal to N(S). The transmitting side will not need to wait for timer\ 
T200 to expire before it can retransmit the lost frame. 
.PP
If an N(S) sequence error occurs when the receiving data link layer
entity is in the REJ exception condition, and it cannot be determined if the
data link layer entity which received the REJ frame has retransmitted in
response to that frame [i.e.,\ if N(S)\ >\ V(M)], then set V(M) equal to 
the N(S) of the received frame. 
.RT
.LP
.rs
.sp 3P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce 1000
APPENDIX\ II
.ce 0
.ce 1000
(to Recommendation Q.921)
.sp 9p
.RT
.ce 0
.ce 1000
\fBOccurrence of\fR 
\fBMDL\(hyERROR\(hyINDICATION\fR 
.sp 1P
.RT
.ce 0
.ce 1000
\fBwithin the basic states and actions\fR 
.ce 0
.sp 1P
.ce 1000
\fBto be taken by the management entity\fR 
.ce 0
.sp 1P
.LP
II.1
	\fIIntroduction\fR 
.sp 1P
.RT
.PP
Table II\(hy1/Q.921 gives the error situations in which the
MDL\(hyERROR\(hyINDICATION primitive will be generated. This primitive 
notifies the data link layer's connection management entity of the occurred 
error situation. The associated error parameter contains the error code 
that describes the 
unique error conditions. Table\ II\(hy1/Q.921 also identifies the associated
connection management actions to be taken from the network and the user 
side, based on the types of error conditions reported. 
.PP
This appendix does not incorporate the retransmission of REJ response frames 
described in Appendix\ I. 
.RT
.sp 2P
.LP
II.2
	\fILayout of Table II\(hy1/Q.921\fR 
.sp 1P
.RT
.PP
The \*QError code\*U column gives the identification value of each
error situation to be included as a parameter with the MDL\(hyERROR\(hyINDICATION 
primitive.
.PP
The column entitled \*QError condition\*U together with the \*QAffected
states\*U describes unique protocol error events and the basic state of 
the data link layer entity at the point that the MDL\(hyERROR\(hyINDICATION 
primitive is 
generated.
.PP
For a given error condition, the column entitled \*QNetwork management 
action\*U describes the preferred action to be taken by the network management 
entity.
.PP
The column entitled \*QUser management action\*U describes the preferred 
action to be taken by the user side management entity on a given error 
condition.
.RT
.sp 2P
.LP
II.3
	\fIPreferred management actions\fR 
.sp 1P
.RT
.PP
The various preferred layer management actions on an error
situation may be described as one of the following:
.RT
.LP
	a)
	Error log
.LP
	This suggests that the network side connection management entity
has the preferred action of logging the event into an error counter.
The length and the operation of the counter mechanisms for the error
situations is implementation dependent.
.LP
	b)
	TEI check
.LP
	 This means that the network side layer management entity invokes the 
TEI check procedure. 
.LP
	c)
	TEI verify
.LP
	This means that the user side layer management entity may
optionally invoke a TEI verify request procedure that asks the
network side layer management entity to issue a TEI check procedure.
.LP
	d)
	TEI remove
.LP
	 This means that the user side layer management entity may directly remove 
its TEI value from service. 
.PP
In most of the described error situations, there is either no
action to be taken on the user side layer management or the action to be 
taken is implementation dependent, as Table\ II\(hy1/Q.921 shows. \*QImplementation 
dependent\*U means that it is optional whether the user side layer management 
has incorporated any form of error counter to log (store) the reported 
event. If 
action is taken, the layer management has to take into account that the data
link layer will have initiated a recovery procedure.
.LP
.rs
.sp 3P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce
\fBH.T. [T22.921]\fR 
.ce
TABLE\ II\(hy1/Q.921
.ce
\fBManagement Entity Actions for MDL Error Indications\fR 
.ps 9
.vs 11
.nr VS 11
.nr PS 9
.TS
center box;
cw(36p) | cw(24p) | cw(48p) | cw(24p) | cw(48p) | cw(48p) .
\fIError Type\fR	\fIError Code\fR	\fIError Condition\fR  	 {
\fIAffected\fR
\fIstates\fR
\fI(See Note\fR
\fI1)\fR
 }	 {
\fINetwork\fR
\fIManagement Action\fR
 }	 {
\fIUser\fR
\fIManagement Action\fR
 }
_
.T&
cw(36p) | lw(24p) | lw(48p) | lw(24p) | lw(48p) | lw(48p) , ^  | l | l | l | l | l 
^  | l | l | l | ^ | ^ , ^  | l | l | l | l | l 
^  | l | l | l | l | l.
 {
Receipt of unsolicited response
A
Supervisory (F = 1)
7
Error log
implementation dependent
B
DM (F = 1)
7,8
Error log
implementation dependent
C
UA (F = 1)
4,7,8
D
UA (F = 1)
4,5,6,7,8
TEI removal procedure or
TEI check procedure; then, if TEI:
\(em
free, remove TEI
\(em
single, no action
\(em
multiple, TEI removal procedure
TEI identity verify
procedure
or
remove TEI
E
Receipt of DM
response (F = 0)
7,8
Error log
implementation dependent
 }					
								
										
_
.T&
lw(36p) | lw(24p) | lw(48p) | lw(24p) | lw(48p) | lw(48p) .
					
Unable to convert table
.TE
.nr PS 9
.RT
.ad r
\fBTable II\(hy1/Q.921 [T22.921] + Notes, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.rs
.sp 6P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.ce 1000
APPENDIX\ III
.ce 0
.ce 1000
(to Recommendation Q.921)
.sp 9p
.RT
.ce 0
.sp 1P
.ce 1000
\fBOptional basic access deactivation procedures\fR 
.sp 1P
.RT
.ce 0
.sp 1P
.LP
III.1
	\fIIntroduction\fR 
.sp 1P
.RT
.PP
This appendix provides one example of a deactivation procedure
which can be used by the network side system management to control deactivation 
of the access. Figure\ III\(hy1/Q.921 provides a conceptual model of the 
interactions which are required for this deactivation procedure.
.RT
.LP
.rs
.sp 29P
.ad r
\fBFigure III\(hy1/Q.921, p.\fR 
.sp 1P
.RT
.ad b
.RT
.sp 2P
.LP
III.2
	\fIDescription of the Conceptual Model\fR 
.sp 1P
.RT
.PP
The monitor function uses layer 2 activity as the basis for
establishing whether deactivation of the access can take place. The signal
INFORMATION is used to report the layer\ 2 activity in the following
manner:
.RT
.LP
	\(em
	INFORMATION (FREE) indicates that there is no data link
connection in the multiple\(hyframe mode of operation;
.LP
	\(em
	INFORMATION (IN USE) indicates that there is at least one
data link connection in the mode\(hysetting or multiple\(hyframe mode
of operation; and
.LP
	\(em
	INFORMATION (UNIT DATA) indicates that a UI frame is about
to be transmitted, or has just been received.
.bp
.PP
Within the data link layer entity the
DL\(hyESTABLISH\(hyREQUEST/INDICATION primitives and DL\(hyRELEASE\(hyINDICATION/CONFIRM 
mark the duration of the multiple\(hyframe mode of operation, and the MDL/DL/UNIT 
DATA\(hyREQUEST/INDICATION primitives mark the transmission and reception 
of 
UI\ frames.
.PP
A signal Status is used to represent the ability of higher layers to enable 
or disable the deactivation procedures: 
.RT
.LP
	\(em
	STATUS (ENABLE) deactivation procedures enabled; and
.LP
	\(em
	STATUS (DISABLE) deactivation procedures disabled.
.PP
The MPH\(hyDEACTIVATE\(hyREQ, MPH\(hyDEACTIVATE\(hyIND and MPH\(hyACTIVATE\(hyIND 
primitives are used as described in \(sc\ 4. The definition and usage of these
primitives are also described in Recommendation\ I.430\ [4] which specifies
layer\ 1.
.PP
Since, in Recommendation I.430, the usage of the MPH\(hyDEACTIVATE\(hyIND
primitive is an implementation option, two cases of deactivation are described 
below. 
.PP
\(sc III.3 provides a description of the deactivation procedure when
the MPH\(hyDEACTIVATE\(hyIND primitive is delivered to the system management 
entity. 
.PP
\(sc III.4 provides a description of the deactivation procedure when
the MPH\(hyDEACTIVATE\(hyIND primitive is not delivered to the system management 
entity.
.PP
\fINote\fR \ \(em\ These procedures require that all layer 3 entities making 
use of the acknowledged information transfer service, must release the 
data link 
connection at an appropriate point after the completion of the information
transfer.
.RT
.sp 2P
.LP
III.3
	\fIDeactivation procedure with MPH\(hyDEACTIVATE\(hyIND\fR 
.sp 1P
.RT
.PP
This deactivation procedure makes use of the MPH\(hyDEACTIVATE\(hyIND
primitive to provide an option of layer\ 1 implementation.
.PP
Figure III\(hy2/Q.921 provides a state transition diagram of the
deactivation procedure with the MPH\(hyDEACTIVATE\(hyIND primitive.
.PP
This deactivation procedure can be represented by six
states:
.RT
.LP
	State 1
	Information transfer not available and free;
.LP
(\fINo info xfer and free\fR )
.LP
	State 2
	Information transfer available and free;
.LP
(\fIInfo xfer and free\fR )
.LP
	State 3
	Information transfer available and in use;
.LP
(\fIInfo xfer and in use\fR )
.LP
	State 4
	Information transfer not available and in use;
.LP
(\fINo info transfer and in use\fR )
.LP
	State 5
	Information transfer interrupted and free;
.LP
(\fIInfo interrupted and free\fR )
.LP
	State 6
	Information transfer interrupted and in use;
.LP
(\fIInfo interrupted and in use\fR )
.PP
These six states are described as follows:
.LP
	\(em
	State 1 represents the state where the access is assumed to be
deactivated and no data link connections are in a mode setting or
multiple\(hyframe mode of operation.
.LP
	\(em
	State 2 represents the state where the access is activated and no
data link connection is in a mode setting or multiple\(hyframe mode of
operation. Timer TM01 is running, and upon its expiry, if deactivation
is enabled, then an MPH\(hyDEACTIVATE\(hyREQ primitive may be issued to
layer\ 1. The access is then assumed to be deactivated.
.LP
	\(em
	State 3 represents the state where the access is activated and at
least one data link connection is in a mode setting or multiple\(hyframe
mode of operation.
.bp
.LP
	\(em
	State 4 represents the state where the access is regarded as being in
an transient state (neither deactivated nor activated) and at least
one data link connection is in a mode setting or multiple\(hyframe mode
of operation. [This state can be entered, for example, due to the
arrival of an INFORMATION (IN USE) signal before an MPH\(hyACTIVATE\(hyIND
primitive.]
.LP
	\(em
	State 5 represents the state where the access is regarded as being
in a transient state (neither deactivated nor activated) and no data
link connection is in a mode setting or multiple\(hyframe mode of
operation. Timer TM01 is running and upon its expiry, if deactivation
is enabled, then an MPH\(hyDEACTIVATE\(hyREQ primitive will be issued to
layer\ 1. The access is assumed to be deactivated.
.LP
	\(em
	State 6 represents the state where the access is regarded as being in
the transient state (neither deactivated nor activated) and at least
one data link connection is in a mode setting or multiple frame mode
of operation.
.PP
Timer TM01 is started whenever state 2 is entered:
.LP
	\(em
	on receipt of an MPH\(hyACTIVATE\(hyIND primitive in state\ 1; and
.LP
	\(em
	on receipt of an INFORMATION (FREE) signal in state 3.
.PP
Timer TM01 is started whenever state 5 is entered:
.LP
	\(em
	on receipt of an INFORMATION (FREE) signal in state 6.
.PP
Timer TM01 is restarted in states 2 and 3 when:
.LP
	\(em
	 TM01 expires while deactivation is disabled by the receipt of a STATUS 
(DISABLE) signal; and 
.LP
	\(em
	an INFORMATION (UNIT DATA) signal is received in order to allow
sufficient time for current and further unacknowledged information
transfer.
.PP
Timer TM01 has a value of ten seconds at the network side.
.LP
.rs
.sp 30P
.ad r
Blanc
.ad b
.RT
.LP
.bp
.LP
.rs
.sp 47P
.ad r
\fBFigure III\(hy2/Q.921, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 2P
.LP
III.4
	\fIDeactivation procedure without MPH\(hyDEACTIVATE\(hyIND\fR 
.sp 1P
.RT
.PP
This deactivation procedure does not make use of the
MPH\(hyDEACTIVATE\(hyIND primitive to provide an option of layer\ 1 implementation. 
Thus this procedure can be represented by only four states, i.e.\ state\ 1,
state\ 2, state\ 3, and state\ 4. States\ 5 and\ 6 have disappeared.
.PP
Figure III\(hy3/Q.921 provides a state transition diagram of this
deactivation procedure without the MPH\(hyDEACTIVATE\(hyIND primitive.
.RT
.LP
.rs
.sp 44P
.ad r
\fBFigure III\(hy3/Q.921, p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.ce 1000
APPENDIX\ IV
.ce 0
.ce 1000
(to Recommendation Q.921)
.sp 9p
.RT
.ce 0
.sp 1P
.ce 1000
\fBAutomatic negotiation of data link layer parameters\fR 
.sp 1P
.RT
.ce 0
.sp 1P
.LP
IV.1
	\fIGeneral\fR 
.sp 1P
.RT
.PP
Each data link layer entity has an associated data link connection management 
entity. The data link connection management entity has the 
responsibility for initializing the link parameters necessary for correct
peer\(hyto\(hypeer information transport.
.PP
The method of initialization of the parameters follows one of the
two\ methods below:
.RT
.LP
	\(em
	initialization to the default values as specified in \(sc 5.9;   or
.LP
	\(em
	initialization based on the values supplied by its peer
entity.
.PP
The latter method utilizes the 
parameter negotiation
procedure
described in this appendix. Typically, after the assignment of a TEI value 
to the management entity, the data link connection management entity is 
notified by its layer management entity that parameter initialization is 
required.
.PP
The data link connection management entity will invoke the
peer\(hyto\(hypeer notification procedure
. After parameter initialization,
the data link connection management entity will notify the layer management
entity that parameter initialization has occurred, and the layer management
entity will issue the MDL\(hyASSIGN\(hyREQUEST.
.RT
.sp 2P
.LP
IV.2
	\fIParameter initialization\fR 
.sp 1P
.RT
.PP
The parameter initialization procedure may invoke either the
internal initialization procedure or the automatic notification of data link
parameter procedure.
.RT
.sp 2P
.LP
IV.3
	\fIInternal parameter initialization\fR 
.sp 1P
.RT
.PP
When the layer management entity notifies the connection management entity 
of TEI assignment, the connection management entity shall initialize the 
link parameters to the default values and notify the layer management of 
task completion. 
.RT
.sp 2P
.LP
IV.4
	\fIAutomatic notification of data link layer parameter values\fR 
.sp 1P
.RT
.PP
For each data link layer an exchange of certain data link layer
parameters may take place between the peer data link connection management
entities before entering the \fITEI\(hyassigned\fR state. This exchange may be
initiated after acquiring a TEI, that is, after:
.RT
.LP
	\(em
	 receipt of a DL\(hyESTABLISH\(hyREQUEST or a DL\(hyUNIT DATA\(hyREQUEST 
primitive following a power\(hyup condition associated with 
non\(hyautomatic TEI user equipment.
.LP
	\(em
	 receipt of the Identity assigned response for automatic TEI assignment 
user equipment. This message contains the TEI 
received by the layer management entity.
.PP
The data link connection management entity, following assignment of a TEI 
from the layer management entity, shall issue an XID command with the P\ 
bit set to 0 and containing the parameter message shown in 
Figure\ IV\(hy1/Q.921, and start the connection management timer\ TM20.
.PP
The I field of the XID command frame shall reflect the parameters
desired for future communications across this data link layer connection.
.PP
The peer data link connection management entity, upon receipt of
this XID command frame, shall transmit an XID response with the F\ bit set to
0 containing the list of parameter values that the peer can
support.
.bp
.PP
If the data link connection management entity receives the above XID response 
prior to expiry of timer\ TM20, it shall stop the timer, and shall 
notify the layer management entity of a successful parameter exchange. 
However, if timer\ TM20 expires before receiving the XID response, the 
data link 
connection management entity shall retransmit the XID command, increment the
retransmission counter and restart timer\ TM20. This retransmission process 
is repeated if timer\ TM20 expires again. Should the retransmission counter 
equal NM20, or an XID response frame with a zero length I\ field be received, 
the data link connection management entity shall issue an indication to 
the layer 
management entity and initialize the parameters to the default values. The
layer management entity may log this condition and then issue the
MDL\(hyASSIGN\(hyREQUEST primitive to the data link layer.
.PP
The timer TM20 is set to 2.5 seconds and NM20 is set to\ 3.
.RT
.LP
.rs
.sp 40P
.ad r
\fBFigure IV\(hy3/Q.921 [T23.921], p.\fR 
.sp 1P
.RT
.ad b
.RT
.LP
.bp
.sp 1P
.ce 1000
\fBABBREVIATIONS\ AND\ ACRONYMS\ USED\ IN\ RECOMMENDATION\ Q.921\fR 
.sp 1P
.RT
.ce 0
.sp 1P
.sp 2P
.LP
\fIAbbreviation\fR 	\fIMeaning\fR 
.sp 1P
.RT
.LP
	\fIof acronym\fR 
.sp 1P
.LP
Ai
	Action indicator
.sp 9p
.RT
.LP
ASP
	Assignment source point
.LP
CEI
	Connection endpoint identifier
.LP
CES
	Connection endpoint suffix
.LP
C/R
	Command/response field bit
.LP
DISC
	Disconnect
.LP
DL\(hy
	Communication between Layer 3 and data link layer
.LP
DLCI
	Data link connection identifier
.LP
DM
	Disconnected mode
.LP
EA
	Extended address field bit
.LP
ET
	Exchange termination
.LP
FCS
	Frame check sequence
.LP
FRMR
	Frame reject
.LP
I
	Information
.LP
ID
	Identity
.LP
ISDN
	Integrated Services Digital Network
.LP
L1
	Layer 1
.LP
L2
	Layer 2
.LP
L3
	Layer 3
.LP
LAPB
	Link access procedure \(em Balanced
.LP
LAPD
	Link access procedure on the D\(hychannel
.LP
M
	Modifier function bit
.LP
MDL\(hy
	Communication between management entity and data link layer
.LP
MPH\(hy
	Communication between system management and physical layer
.LP
N(R)
	Receive sequence number
.LP
N(S)
	Send sequence number
.LP
P/F
	Poll/Final bit
.LP
PH\(hy
	Communication between data link layer and physical layer
.LP
RC
	Retransmission counter
.LP
REC
	Receiver
.LP
REJ
	Reject
.LP
Ri
	Reference number
.LP
RNR
	Receive not ready
.LP
RR
	Receive ready
.bp
.LP
S
	Supervisory
.LP
S
.FS
A different acronym has to be found for Supervisory
function bit.
.FE
	Supervisory function bit
.LP
SABME
	Set asynchronous balanced mode extended
.LP
SAP
	Service access point
.LP
SAPI
	Service access point identifier
.LP
TE
	Terminal equipment
.LP
TEI
	Terminal endpoint identifier
.LP
TX
	Transmit
.LP
U
	Unnumbered
.LP
UA
	Unnumbered acknowledgement
.LP
UI
	Unnumbered information
.LP
V(A)
	Acknowledge state variable
.LP
V(M)
	Recovery state variable
.LP
V(R)
	Receive state variable
.LP
V(S)
	Send state variable
.LP
XID
	Exchange identification
.sp 2P
.LP
	\fBReferences\fR 
.sp 1P
.RT
.LP
[1]
	 CCITT Recommendation Q.920 (I.440), \fIISDN user\(hynetwork interface 
data\fR \fIlink layer \(em General aspects\fR . 
.LP
[2]
	CCITT Recommendation Q.930 (I.450), \fIISDN user\(hynetwork interface\fR 
\fIlayer 3 \(em General aspects\fR .
.LP
[3]
	CCITT Recommendation Q.931 (I.451), \fIISDN user\(hynetwork interface\fR 
\fIlayer 3 specification\fR .
.LP
[4]
	CCITT Recommendation I.430, \fIBasic user\(hynetwork interface layer 1\fR 
\fIspecification\fR .
.LP
[5]
	CCITT Recommendation I.431, \fIPrimary rate user\(hynetwork interface\fR 
\fIlayer 1 specification\fR .
.LP
[6]
	 CCITT Recommendation X.25, \fIInterface between data terminal equipment\fR 
\fI(DTE) and data circuit terminating equipment (DCE) for terminals\fR 
\fIoperating in the packet mode and connected to public data networks\fR 
\fIby dedicated circuit\fR .
.sp 1P
.ce 1000
.sp 1P
.RT
.ce 0
.sp 1P
.LP
.sp 18
.bp
.LP
\fBMONTAGE: PAGE PAIRE = PAGE BLANCHE\fR 
.sp 1P
.RT
.LP
.bp