delim @@

\| 5i'
		ANNEX D (to Recommendation Q.921) State transition table of the point-to-point procedures of the data link layer D.1 The state transition table presented in Tables D-1/Q.921 to D-3/Q.921 is based on the eight basic states (see

§ B.2) recognized in the SDL representation and the related transmitter and receiver conditions.

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.

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. ``peer receiver busy''), whilst some are confined to the receiver (e.g. ``REJ recovery''). This implies, if the concept of non-partitioning 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.

		Events are defined as follows: a) primitives; b) repertoire of frames to be received; -- unnumbered frames (SABME, DISC, UA, DM, UI, FRMR) -- supervisory frames (RR, REJ, RNR) -- information frame (I); c) internal events (servicing of queues, expiry of timers, receiver busy condition). The actions to be taken when an event occurs whilst in a specific state comprise: i) transition to another state ii) peer-to-peer frame to be transmitted iii) primitives to be issued iv) timer actions v) retry counters vi) state variables vii) P/F bit setting viii) discarding contents of queues.
D.2		Key to the state transition table Fascicle	VI.10 -- Rec. Q.921 1

D.2.1 Definition	Definition of a cell of the state transition table		Diagram [T17.921], p.
2 Fascicle	VI.10 -- Rec. Q.921

D.2.2

Key to the contents of a cell

Impossible by the definition of the data link layer service.

Impossible by the definition of the peer-to-peer data link procedures.

No action, no state change.

V(S) = V(A) = N(R) Collective term for the two actions V(S) = N(R) and V(A) = N(R).

Timer T200 Start timer T200 if not already running.

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.

``DISCARD'' Indicates the discarding of the information contained in the information field of the I frame.

(A-O) The codes used in MDL-ERROR-INDICATION signals are defined in Table II-1/Q.921 in Appendix II. When multiple codes are shown, only one applies.

	Diagram	Diagram [T18.921] + Note, p.
blanc	Fascicle VI.10 --	Rec. Q.921 3

H.T. [1T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (1 of 10) cw(342p) .

{ State transition table: receiving primitive

}

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 lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) . lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION See Note lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | lw(36p) | rw(36p) | cw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) . DL-ESTABLISH-REQUEST { MDL-ASS-IDN

| |

| | 3

} | | | | | | 3 I { RC=0 TX SABME P=1 START T200 5.0

} I {

| | DISC. I QUEUE

| | 5.0

} I I _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | rw(36p) | cw(36p) | cw(36p) . DL-RELEASE-REQUEST I I I DL-REL-CONF I | | 5.2 I I _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) . DL-DATA-REQUEST I I I I I DATA INTO I QUEUE I I _ 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 _ 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 _ lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) . DL-UNIT DATA-REQUEST { MDL-ASS-IND UNIT DATA INTO UI QUEUE 2

} {

| | UNIT DATA INTO UI QUEUE

| |

} _ 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 _ lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . MDL-ASSIGN-REQUEST { STORE TEI VALUE

\| \| \| \| 4 } { STORE TEI VALUE	RC=0 TX SABME P=1 START T200 5.0
} \| \| I \| \| I \| \| I MDL-REMOVE-REQUEST \| \| DISC. UI QUEUE	\| \| I \| \| I _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . I I I {

| |

	\| \| 1 }		{ DL-REL-IND DISC. UI QUEUE STOP T200
	\| \| 1 }		{ DL-REL-IND DISC. I and UI QUEUES STOP T200 1
	} } \| \| 1		{ DL-REL-CONF DISC. I and UI QUEUES STOP T200 1 { DL-REL-CONF DISC. UI QUEUE STOP T200

} _ lw(54p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . MDL-ERROR-RESPONSE I DISC. UI QUEUE | | 1 { DL-REL-IND DISC. UI QUEUE 1

} I I I

DEACTIVATION

{

lw(54p)

cw(36p)

lw(36p)

lw(36p) | lw(36p) .

PERSISTENT

| | DISC. UI QUEUE

| |

| | 1

} \| \| }	} \| \| \| \| 1 }	{ DL-REL-IND \| \| DISC.	{ DL-REL-IND DISC. UI QUEUE \| \| DISC. UI QUEUE { DL-REL-IND DISC. UI QUEUE STOP	T200
\| }	\| \| 4 }	{ DL-REL-IND	{ DL-REL-IND DISC. I and UI QUEUES STOP T200 4
} } \| } 4	} } \| \| 4 }	{ DL-REL-CONF { DL-REL-CONF Fascicle	{ DL-REL-CONF DISC. I and UI QUEUES STOP T200 4 { DL-REL-CONF DISC. UI QUEUE STOP T200 VI.10 -- Rec. Q.921

Note -- The transmitter condition ``pending release'' may occur only in cases of layer 2 initiated re-establishment.

Table D-1.1/Q.921 (1 of 10) [1T19.921] + Note, p.

Fascicle VI.10 -- Rec. Q.921 5

H.T. [2T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (2 of 10) cw(342p) .

{ State transition table: receiving unnumbered frame with correct format

}

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 lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . TRANSMITTER CONDITION Establish Re-establish

{ SABME P=1 ABLE TO ENTER STATE 7.0

} / / / { DL-EST-IND V(S,R,A)=0 TX UA F=1 START T203 7.0

} TX UA F=1 TX DM F=1 _ 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 / / / / _ 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-EST-IND V(S,R,A)=0 TX UA F=0 START T203 7.0

} TX UA F=0 TX DM F=0 _ 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 / / /		/ _ 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 cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . DISC P=0 /		TX DM F=1 TX UA F=1 _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| / / TX DM F=0 TX DM F=0 TX UA F=0 _ 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-ERR-IND(C) { V(S,R,A)=0 DL-EST-CONF 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-REF-CONF STOP T200 \| \| 4 } _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . UA F=1 V(S) ¹ V(A)	/ / / {
DISC I QUEUE V(S,R,A)=0 DL-EST-IND STOP T200 START T203 7.0

} _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) . UA F=0 / / / MDL-ERR-IND(D) _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) . DM F=1 / / / -- { DL-REL-IND STOP T200

	\| \| 4 }		{ DL-REL-IND DISC I QUEUE STOP T200 4
	} } \| \| 4		{ DL-REL-CONF DISC I QUEUE STOP T200 4 { DL-REL-CONF STOP T200

} _ 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

} --

{ DM F=0

} /

command

-- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

UNABLE TO ENTER STATE 7.0

/ / -- / / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . UI

/ / / DL-UNIT DATA-IND _

Table D-1/Q.921 (2 of 10) [2T19.921], p.

6 Fascicle VI.10 -- Rec. Q.921

H.T. [3T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (3 of 10) cw(342p) .

{ State transition table: receiving FRMR unnumbered frame with correct format

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

Pending release lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting SABME / / / / -- -- -- / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting DISC / / / / / / / -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting UA / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting DM / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ FRMR response rejecting I command } / / / / -- -- --		-- _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) .
{ FRMR response rejecting S frame } / / / / -- -- --		-- _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . FRMR
response rejecting FRMR / /	/	/ / / / / _ Table D-1/Q.921 (3 of 10) [3T19.921], p. Fascicle VI.10 -- Rec. Q.921 7

H.T. [4T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (4 of 10) cw(342p) .

{ State transition table: receiving RR supervisory frame with correct format

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

Pending release lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RR command P=1 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RR command P=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RR response F=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RR response F=1 / / / -- -- -- -- -- _

Table D-1/Q.921 (4 of 10) [4T19.921], p. 8 Fascicle VI.10 -- Rec. Q.921

H.T. [5T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (5 of 10) cw(342p) .

{ State transition table: receiving REJ supervisory frame with correct format

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

Pending release lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . REJ command P=1 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . REJ command P=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . REJ response F=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . REJ response F=1 / / / -- -- -- -- -- _

Table D-1/Q.921 (5 of 10) [5T19.921], p.

Fascicle VI.10 -- Rec. Q.921 9

H.T. [6T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (6 of 10) cw(342p) .

{ State transition table: receiving RNR supervisory frame with correct format

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

Pending release lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RNR command P=1 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RNR command P=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RNR response F=0 / / / -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . RNR response F=1 / / / -- -- -- -- -- _

Table D-1/Q.921 (6 of 10) [6T19.921], p. 10 Fascicle VI.10 -- Rec. Q.921

H.T. [7T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (7 of 10) cw(342p) .

{ State transition table: receiving I command frame with correct format acknowledging all outstanding I frames or containing an N(R) which satisfies V(A) | (= | (R) | (= | (S)

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

{ I command } / /

P=1 N(S) = V(R) N(R) = V(S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) = V(R) N(R) = V(S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) ¹ V(R) N(R) = V(S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) ¹ V(R) N(R) = V(S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) = V(R) V(A) | (= | (R) | (= | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) = V(R) V(A) | (= | (R) | (= | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) ¹ V(R) V(A) | (= | (R) | (= | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) ¹ V(R) V(A) | (= | (R) | (= | (S)

/ -- -- -- -- -- _

Table D-1/Q.921 (7 of 10) [7T19.921], p.

Fascicle VI.10 -- Rec. Q.921 11

H.T. [8T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (8 of 10) cw(342p) .

{ State transition table: receiving I command frame with correct format containing an N(R) which satisfies V(A) | | (R) | | (S), or an N(R) error

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

{ I command } / /

P=1 N(S) = V(R) V(A) | | (R) | | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) = V(R) V(A) | | (R) | | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) ¹ V(R) V(A) | | (R) | | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) ¹ V(R) V(A) | | (R) | | (S)

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) = V(R) N(R) error

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) = V(R) N(R) error

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=1 N(S) ¹ V(R) N(R) error

/ -- -- -- -- -- _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

P=0 N(S) ¹ V(R) N(R) error

/ -- -- -- -- -- _

Table D-1/Q.921 (8 of 10) [8T19.921], p.

12 Fascicle VI.10 -- Rec. Q.921

H.T. [9T19.921]

center box; cw(342p) . TABLE D-1/Q.921 (9 of 10) cw(342p) .

{ State transition table: Internal events (expiry of timers, receiver busy condition)

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

} { RC=RC+1 TX DISC P=1 START T200

} _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) . T200 TIME-OUT RC = N200

{

| | DL-REL-IND MDL-ERR-IND(G) 4

} { DISC I QUEUE DL-REL-IND MDL-ERR-IND(G) 4

} { DISC I QUEUE DL-REL-CONF MDL-ERR-IND(G) 4

} {

| | DL-REL-CONF MDL-ERR-IND(H) 4

} _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p)

cw(36p)

T203

TIME-OUT / / / / / / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . SET OWN RECEIVER BUSY (Note) / / / / / / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ CLEAR OWN RECEIVER BUSY (Note)

} / / / / / / / /

Note -- These signals are generated outside the procedures specified in this state transition table, and may be generated by the connection management entity.

Table D-1/Q.921 (9 of 10) [9T19.921], p.

Fascicle VI.10 -- Rec. Q.921 13

H.T. [10T19.921]

center box; cw(342p) .

{ TABLE D-1/Q.921 (10 of 10)

} cw(342p) .

{ State transition table: Receiving frame with incorrect format or frame not implemented

}

cw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(108p) | cw(36p) . BASIC STATE TEI UNASSIGNED ASSIGN AWAITING TEI

Pending release lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) . RECEIVER CONDITION lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 1 2 3 4 5.0 5.1 5.2 6 lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . SABME incorrect length / / / MDL-ERR-IND(N) _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DISC incorrect length / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . UA incorrect length / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DM incorrect length / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR incorrect length / / /

_ 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

} / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . N201 error / / / MDL-ERR-IND(O) _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ Undefined command and response frames } / / / MDL-ERR-IND(L)		_ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \|
cw(36p) . I field not permitted / / /		MDL-ERR-IND(M) _ Table D-1/Q.921 (10 of 10) [10T19.921], p.
14 Fascicle VI.10 -- Rec. Q.921

H.T. [1T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (1 of 10) cw(342p) .

{ State transition table: receiving primitive

} cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ DL-ESTABLISH-REQUEST

| |

} { DISC I QUEUE RC=0 TX SABME P=1 STOP T203 RESTART T200 5.0

} _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ DL-RELEASE-REQUEST \| \| } { DISC I QUEUE RC=0 TX DISC P=1	P=1 STOP T203 RESTART T200 6.0
} _ DL-DATA-REQUEST DATA INTO lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . { I FRAME IN QUEUE V(S) \| \| (A)+k	lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . I QUEUE _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \|

} { TX I P=0 V(S)=V(S)+1 STOP T203 TIMER T200

} LEAVE I FRAME IN QUEUE _ 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 _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) . DL-UNIT DATA-REQUEST UNIT DATA INTO UI QUEUE _ 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 _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) . MDL-ASSIGN-REQUEST I _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ MDL-REMOVE-REQUEST

| |

} { DL-REL-IND DISC I and UI QUEUES STOP T200 STOP T203 1

} _ lw(54p) | cw(36p) |

MDL-ERROR-RESPONSE I

cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .

_ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) |

cw(36p) . PERSISTENT DEACTIVATION | | { DL-REL-IND DISC I and UI QUEUES STOP T200 STOP T203 4

	}		_
				Table Fascicle VI.10	Table D-2/Q.921 (1 of 10) [1T20.921], p. -- Rec. Q.921 15

H.T. [2T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (2 of 10) cw(342p) .

{ State transition table: receiving unnumbered frame with correct format

} BASIC STATE MULTIPLE FRAME ESTABLISHED

| |

} { MDL-ERR-IND(F) V(S,R,A)=0 TX UA F=1 STOP T200 START T203 7.0

} _ lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ SABME P=1 V(S) ¹ V(A)

	\| \| }		{ DL-EST-IND MDL-ERR-IND(F) DISC I QUEUE V(S,R,A)=0 TX UA F=1 STOP T200 START T203
	\| \| }		{ DL-EST-IND MDL-ERR-IND(F) DISC I QUEUE V(S,R,A)=0 TX UA F=1 STOP T200 START T203 7.0
	}		_ 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-ERR-IND(F) V(S,R,A)=0 TX UA F=0 STOP T200 START T203

| |

} { MDL-ERR-IND(F) V(S,R,A)=0 TX UA F=0 STOP T200 START T203 7.0

} _ lw(54p) \| lw(36p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . { SABME P=0 V(S) ¹ V(A) \| \| } { DL-EST-IND MDL-ERR-IND(F) DISC I QUEUE V(S,R,A)=0 TX UA F=0 STOP T200 START T203 \| \| } { DL-EST-IND MDL-ERR-IND(F) DISC I QUEUE V(S,R,A)=0 TX UA F=0 STOP T200 START T203 7.0 } _ lw(54p) \| lw(36p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p)	. DISC P=1 \| \| {
DL-REL-IND DISC I QUEUE TX UA F=1 STOP T200, T203 4

} _ lw(54p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DISC P=0 | |

{ DL-REL-IND DISC I QUEUE TX UA F=0 STOP T200, T203 4

}	}		_
16		Fascicle VI.10 -- Rec. Q.921			Table D-2/Q.921 (2 of 10) [2T.20.921], p.

H.T. [3T20.921]

center box; cw(342p) .

{ TABLE D-2/Q.921 (2 of 10 cont. )

} cw(342p) .

{ State transition table: receiving unnumbered frame with correct format

}

center box ; cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . UA F=1 MDL-ERR-IND(C) _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . UA F=0 MDL-ERR-IND(D) _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DM F=1 MDL-ERR-IND(B) _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) . DM F=0 | | { MDL-ERR-IND(E) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }		{ MDL-ERR-IND(E) RC = 0 TX SABME P=1 RESTART T200 _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . UI command DL-UNIT
DATA-IND		_ Table D-2/Q.921 (2 of 10 cnt'd) [3T20.921], p. Fascicle VI.10 -- Rec. Q.921 17

H.T. [4T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (3 of 10) cw(342p) .

{ State transition table: receiving FRMR unnumbered frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting SABME / / / / / / / / _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR response rejecting DISC / / / / / / / / _ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ FRMR response rejecting UA

| |

} { MDL-ERR-IND(K) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }						{ MDL-ERR-IND(K) RC = 0 TX SABME P=1 RESTART T200 _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . FRMR	FRMR response rejecting
DM		/		/		/ / / / / / _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| cw(36p) \| cw(36p)	\| cw(36p) .

{ FRMR response rejecting I command

| |

} { MDL-ERR-IND(K) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { MDL-ERR-IND(K) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

}

_ lw(54p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ FRMR response rejecting S frame }		_ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . FRMR
response rejecting FRMR / /	/	/ / / / / _ Table D-2/Q.921 (3 of 10) [4T20.921], p.
18 Fascicle VI.10 -- Rec. Q.921

H.T. [5T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (4 of 10) cw(342p) .

{ State transition table: receiving RR supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ 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

} _ 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

} _ 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) _ 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-ERR-IND(A) STOP T200 RESTART T203 V(A)=N(R)
	\| \| }		{ MDL-ERR-IND(A) STOP T200 START T203 V(A)=N(R) 7.0
	} } }		{ MDL-ERR-IND(A) STOP T200 START T203 V(A)=N(R) 7.1 { MDL-ERR-IND(A) STOP T200 START T203 V(A)=N(R) 7.2 { MDL-ERR-IND(A) STOP T200 START T203 V(A)=N(R) 7.3

} _ 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

} _ 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 _ 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)

} _ 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-ERR-IND(A) RESTART T200 V(A)=N(R)

Fascicle VI.10 -- Rec. Q.921 19

\| \| } } } } } _	\| \| } } } } } _	{ MDL-ERR-IND(A) { MDL-ERR-IND(A) { MDL-ERR-IND(A)	{ MDL-ERR-IND(A) RESTART T200 V(A)=N(R) 7.0 { MDL-ERR-IND(A) RESTART T200 V(A)=N(R) 7.1 { MDL-ERR-IND(A) RESTART T200 V(A)=N(R) 7.2 { MDL-ERR-IND(A) RESTART T200 V(A)=N(R) 7.3
20		Fascicle	VI.10 -- Rec. Q.921	Table D-2/Q.921 (4 of 10) [5T20.921], p.

H.T. [6T20.921]

center box; cw(342p) .

{ TABLE D-2/Q.921 (4 of 10 cont. )

} cw(342p) .

{ State transition table: receiving RR supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ 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

cw(36p) | cw(36p) | cw(36p) | rw(36p) | rw(36p) | rw(36p) | rw(36p) .

{ RR command P=0 V(A) = N(R) < V(S)

| |

TX RNR F=1 7.2

TX RNR F=1 7.3 _ lw(54p) | cw(36p) |

} -- -- -- -- 7.0 7.1 7.2 7.3 _ 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) } -- -- -- --		_ 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-ERR-IND(A) \| \|		MDL-ERR-IND(A) 7.0 MDL-ERR-IND(A) 7.1 MDL-ERR-IND(A)

7.2 MDL-ERR-IND(A) 7.3 _ 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-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} _ 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-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }		{ MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 _ 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		_ 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-ERR-IND(A) MDL-ERR-IND(J)	RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1
	} { MDL-ERR-IND(A) \| \| 5.1 } _	MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200
		Table D-2/Q.921 (4 of 10 cnt'd) [6T20.921], p. Fascicle VI.10 -- Rec. Q.921 21

H.T. [7T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (5 of 10) cw(342p) .

{ State transition table: receiving REJ supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ REJ \| \| } \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } } } } } _ { REJ }	{ 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 } _ 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 } _ 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) } _ lw(54p) \| lw(36p) \| cw(36p) \| lw(36p) \| cw(36p)	\| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) .
{ REJ \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } } } } 22	{ REJ response F=1 N(R)=V(S) (Note) \| \| } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 RESTART T203 \| \| } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.0 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.1 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.2 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.3 } _ 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 } _ 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 Fascicle VI.10 -- Rec. Q.921

} _ 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)

} _ 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-ERR-IND(A) V(S)=V(A)=N(R) STOP T200 START T203
	\| \| }		{ MDL-ERR-IND(A) V(S)=V(A)=N(R) STOP T200 START T203 7.0
	} } }		{ MDL-ERR-IND(A) V(S)=V(A)=N(R) STOP T200 START T203 7.1 { MDL-ERR-IND(A) V(S)=V(A)=N(R) STOP T200 START T203 7.2 { MDL-ERR-IND(A) V(S)=V(A)=N(R) STOP T200 START T203 7.3

} Note -- This event is impossible by the definition of the peer-to-peer data link procedures. However, it would not harm the information transfer, if actions according to this table are taken.

Table D-2/Q.921 (5 of 10) [7T20.921], p.

Fascicle VI.10 -- Rec. Q.921 23

H.T. [8T20.921]

center box; cw(342p) .

{ TABLE D-2/Q.921 (5 of 10 cont. )

} cw(342p) .

{ State transition table: receiving REJ supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ REJ command P=1 N(R) error

| |

} { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} _ 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-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }		_		{ MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 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				_ 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-ERR-IND(A) MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }	} \| \| 5.1 }	_	_		{ MDL-ERR-IND(A) MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200
24	Fascicle	VI.10		--	Table D-2/Q.921 (5 of 10 cnt'd) [8T20.921], p. Rec. Q.921

H.T. [9T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (6 of 10) cw(342p) .

{ State transition table: receiving RNR supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ RNR command P=1 N(R)=V(S) \| \| } { TX RR F=1 STOP T203 RESTART T200	T200 V(A)=N(R) 7.4
} { TX RR F=1 STOP T203 RESTART T200 } { TX RNR F=1 STOP T203 RESTART } { TX RNR F=1 STOP T203 RESTART } { TX RR F=1 RESTART T200 V(A)=N(R) \| \| \| \| } { TX RNR F=1 RESTART T200 V(A)=N(R)	T200 V(A)=N(R) 7.5 T200 V(A)=N(R) 7.6 T200 V(A)=N(R) 7.7 V(A)=N(R) T200 V(A)=N(R)
\| \| \| \| } _ lw(54p) \| lw(36p) \| 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)	V(A)=N(R) 7.4
} { STOP T203 RESTART T200 V(A)=N(R) } { STOP T203 RESTART T200 V(A)=N(R) } { STOP T203 RESTART T200 V(A)=N(R) } { RESTART T200 V(A)=N(R) \| \| \| \| } _ lw(54p) \| lw(36p)	V(A)=N(R) 7.5 V(A)=N(R) 7.6 V(A)=N(R) 7.7 \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| cw(36p) . RNR response F=0
N(R)=V(S)	_ 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-ERR-IND(A) STOP T203 RESTART T200 V(A)=N(R) 7.4

} { MDL-ERR-IND(A) STOP T203 RESTART T200 V(A)=N(R) 7.5

} { MDL-ERR-IND(A) STOP T203 RESTART T200 V(A)=N(R) 7.6

} { MDL-ERR-IND(A) STOP T203 RESTART T200 V(A)=N(R) 7.7

} { MDL-ERR-IND(A) RESTART T200 V(A)=N(R)

| | 7.6

}

_ 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)
	\| \| }		_ 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) \| \| .	_ 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)

Fascicle VI.10 -- Rec. Q.921 25

} _ lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | cw(36p) .

{ RNR \| \| }	{ RNR response F=1 V(A) N(R) < V(S) \| \| } { MDL-ERR-IND(A) RESTART T200	V(A)=N(R) 7.4
} } } } \| \| }	} { MDL-ERR-IND(A) RESTART T200 } { MDL-ERR-IND(A) RESTART T200 } { MDL-ERR-IND(A) RESTART T200 } { MDL-ERR-IND(A) RESTART T200 \| \| } _	V(A)=N(R) 7.5 V(A)=N(R) 7.6 V(A)=N(R) 7.7 V(A)=N(R)
26	Fascicle VI.10 -- Rec. Q.921	Table D-2/Q.921 (6 of 10) [9T20.921], p.

H.T. [10T20.921]

center box; cw(342p) .

{ TABLE D-2/Q.921 (6 of 10 cont. )

} cw(342p) .

{ State transition table: receiving RNR supervisory frame with correct format

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ RNR command P=1 N(R) error

| |

} { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200

| | 5.1

} _ 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-ERR-IND(J) RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1

} \| \| 5.1 }		{ MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 _ 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		_ 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-ERR-IND(A) MDL-ERR-IND(J)	RC =0 TX SABME P=1 STOP T203 RESTART T200 5.1
	} { MDL-ERR-IND(A) \| \| 5.1 } _	MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200
		Table D-2/Q.921 (6 of 10 cnt'd) [10T20.921], p. Fascicle VI.10 -- Rec. Q.921 27

H.T. [11T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (7 of 10) cw(342p) .

{ State transition table: receiving I command frame with correct format acknowledging all outstanding I frames or containing an N(R) which satisfies V(A) | | (R) | | (S)

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .

{ I \| \| } \| \| }	{ 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	7.0
} \| \| \| \| } \| \| \| \| \| \| } \| \| \| \| 7.4 } \| \| \| \| \| \| \| \| }	} { ``DISCARD'' TX RNR F=1 STOP T200 RESTART T203 V(A)=N(R) \| \| \| \| } { 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) \| \| \| \| 7.4 } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .	.
{ I \| \| } \| \| } } \| \| \| \| \| \| } \| \| \| \| \| \| } \| \| \| \| 7.4 } \| \| \| \| \| \| \| \| \| \| }	{ 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 } { ``DISCARD'' STOP T200 RESTART T203 V(A)=N(R) \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| \| \| 7.4 } { ``DISCARD'' V(A)=N(R) \| \| \| \| \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .	.
{ I \| \| } } \| \| 28	{ I command P=1 N(S) ¹ V(R) N(R) = V(S) \| \| } { ``DISCARD'' TX REJ F=1 STOP T200 RESTART T203 V(A)=N(R) 7.1 } { ``DISCARD'' TX RR F=1 STOP T200 RESTART T203 V(A)=N(R) \| \| Fascicle VI.10 -- Rec. Q.921

} { ``DISCARD'' TX RNR F=1 STOP T200 RESTART T203 V(A)=N(R) \| \| } { ``DISCARD'' TX REJ F=1 V(A)=N(R) \| \| \| \| 7.5 } { ``DISCARD'' TX RR F=1 V(A)=N(R) \| \| \| \| \| \| } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p)	\| cw(36p) .
{ I command P=0 N(S) ¹ V(R) N(R) = V(S) \| \| } { ``DISCARD'' TX REJ F=1 STOP T200 RESTART T203 V(A)=N(R) 7.1 } { ``DISCARD'' STOP T200 RESTART T203 V(A)=N(R) \| \| \| \| } { ``DISCARD'' TX REJ F=0 V(A)=N(R) \| \| \| \| 7.5 } { ``DISCARD'' V(A)=N(R) \| \| \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(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	7.0
} { ``DISCARD'' TX RNR F=1 RESTART T200 V(A)=N(R) \| \| \| \| } { 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) \| \| 7.4 } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| \| \| } _ 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
} { ``DISCARD'' RESTART T200 V(A)=N(R) \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| 7.4 } { ``DISCARD'' V(A)=N(R) \| \| \| \|

Fascicle VI.10 -- Rec. Q.921 29

\| \| \| \| }	\| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p)	\| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .
{ I \| \| }	{ I command P=1 N(S) ¹ \| \| } { ``DISCARD'' TX REJ	P=1 N(S) ¹ V(R) V(A) \| \| (R) \| \| (S) TX REJ F=1 RESTART T200 V(A)=N(R) 7.1
} \| \| }	} { ``DISCARD'' TX RR \| \| } { ``DISCARD'' TX RNR	TX RR F=1 RESTART T200 V(A)=N(R) TX RNR F=1 RESTART T200 V(A)=N(R)
\| \| }	\| \| } { ``DISCARD''	TX REJ F=1 V(A)=N(R)
\| \| 7.5 }	\| \| 7.5 } { ``DISCARD''	TX RR F=1 V(A)=N(R)
\| \| \| \| }	\| \| \| \| } { ``DISCARD''	TX RNR F=1 V(A)=N(R)
\| \| \| \| }	\| \| \| \| } _ lw(54p) \| lw(36p)	\| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .
{ I \| \| }	{ I command P=0 N(S) \| \| } { ``DISCARD''	P=0 N(S) ¹ V(R) V(A) \| \| (R) \| \| (S) TX REJ F=0 RESTART T200 V(A)=N(R) 7.1
} \| \| \| \| }	} { ``DISCARD'' \| \| \| \| } { ``DISCARD''	RESTART T200 V(A)=N(R) { ``DISCARD'' TX REJ F=0 V(A)=N(R)
\| \| 7.5 }	\| \| 7.5 } { ``DISCARD''	V(A)=N(R)
\| \| \| \| \| \| }	\| \| \| \| \| \| } _
30	Fascicle	Table D-2/Q.921 (7 of 10) [11T20.921], p. VI.10 -- Rec. Q.921

H.T. [12T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (8 of 10) cw(342p) .

{ State transition table: receiving I command frame with correct format containing an N(R) which satisfies

V(A) | | (R) | | (S), or an N(R) error

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

{ 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 } { ``DISCARD'' TX RNR F=1 \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=1 \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=1 7.4 } { ``DISCARD'' TX RNR F=1 \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(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 } { ``DISCARD'' \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 7.4 } { ``DISCARD'' \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p)	\| cw(36p) .
{ I command P=1 N(S) ¹ V(R) V(A)=N(R) \| \| (S) } ``DISCARD'' TX REJ F=1 7.1 ``DISCARD'' TX RR F=1 \| \| { ``DISCARD'' TX	TX RNR F=1
\| \| } ``DISCARD'' TX REJ F=1 7.5 ``DISCARD'' TX RR F=1 \| \| { ``DISCARD''	{ ``DISCARD'' TX RNR F=1
\| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p)	\| cw(36p) .
{ I command P=0 N(S) ¹ V(R) V(A)=N(R) \| \| (S) } ``DISCARD'' TX REJ F=0 7.1 ``DISCARD'' \| \| \| \| ``DISCARD''	TX REJ F=0 7.5 ``DISCARD'' \| \| \| \| _ 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-ERR-INJ(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' TX RNR F=1 MDL-ERR-INJ(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-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

} { ``DISCARD'' TX RNR F=1 MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200

| |

Fascicle VI.10 -- Rec. Q.921

| | 5.1

} _ 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-ERR-INJ(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' MDL-ERR-INJ(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200

| | 5.1

} { V(R)=V(R)+1 DL=DATA=IND MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

} { ``DISCARD'' MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200

| |

| | 5.1

} _ lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .

{ I command P=1 N(S) ¹ V(R) N(R) error

| |

} { ``DISCARD'' TX REJ F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' TX RR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' TX RNR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' TX REJ F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

} { ``DISCARD'' TX RR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

} { ``DISCARD'' TX RNR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200

| | 5.1

} _ lw(54p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) .

{ I command P=0 N(S) ¹ V(R) N(R) error

| |

} { ``DISCARD'' TX REJ F=0 MDL-ERR-IND(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} { ``DISCARD'' MDL-ERR-IND(J) RC = 0 TX SABME P=1 STOP T203 RESTART T200

| | 5.1

} { ``DISCARD'' TX REJ F=0 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200

\| \| 5.1 } \| \| \| \| 5.1 }	\| \| 5.1 } { ``DISCARD'' MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 \| \| \| \| 5.1 } _
32	Fascicle VI.10 -- Rec. Q.921	Table D-2/Q.921 (8 of 10) [12T20.921], p.

H.T. [13T20.921]

center box; cw(342p) . TABLE D-2/Q.921 (9 of 10) cw(342p) .

{ State transition table: internal events (expiry of timers,

receiver busy condition)

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) .

{ T200 TIME-OUT RC < | 200

	\| \| }		{ RC=0 either V(S)=V(S)--1 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)--1 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)--1 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)--1 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

} _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

{ T200 TIME-OUT RC = N200

| |

} / / / / / / / / _ lw(54p) | lw(36p) | lw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . T203 TIME-OUT | | 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

} / / / / _ 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 -- -- TX RNR F=0 7.6 TX RNR F=0 7.7 -- -- _ lw(54p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) | cw(36p) | cw(36p) | lw(36p) | lw(36p) .

{ CLEAR OWN RECEIVER BUSY (Note)

} -- -- TX RR F=0 7.0 TX RR F=0 7.1 -- -- TX RR F=0 7.4 { TX RR F=0 7.5

}

Note -- These signals are generated outside the procedures specified in this state transition table, and may be generated by the connection management entity.

Table D-2/Q.921 (9 of 10) [13T20.921], p.

Fascicle VI.10 -- Rec. Q.921 33

H.T. [14T20.921]

center box; cw(342p) .

{ TABLE D-2/Q.921 (10 of 10)

} cw(342p) .

{ State transition table: receiving frame with incorrect format or frame not implemented

}

cw(54p) | cw(288p) . BASIC STATE MULTIPLE FRAME ESTABLISHED

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 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 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . STATE NUMBER 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . SABME incorrect length | | { MDL-ERR-IND(N) RC = 0 TX SABME P=1 STOP T203 RESTART T200 5.1

} _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DISC incorrect length _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . UA incorrect length _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . DM incorrect length _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) . FRMR incorrect length _ lw(54p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) | cw(36p) .

\| \| \| \| 4 } { STORE TEI VALUE	RC=0 TX SABME P=1 START T200 5.0
} \| \| I \| \| I \| \| I MDL-REMOVE-REQUEST \| \| DISC. UI QUEUE	\| \| I \| \| I _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . I I I {

} \| \| }	} \| \| \| \| 1 }	{ DL-REL-IND \| \| DISC.	{ DL-REL-IND DISC. UI QUEUE \| \| DISC. UI QUEUE { DL-REL-IND DISC. UI QUEUE STOP	T200
\| }	\| \| 4 }	{ DL-REL-IND	{ DL-REL-IND DISC. I and UI QUEUES STOP T200 4
} } \| } 4	} } \| \| 4 }	{ DL-REL-CONF { DL-REL-CONF Fascicle	{ DL-REL-CONF DISC. I and UI QUEUES STOP T200 4 { DL-REL-CONF DISC. UI QUEUE STOP T200 VI.10 -- Rec. Q.921

{ DL-RELEASE-REQUEST \| \| } { DISC I QUEUE RC=0 TX DISC P=1	P=1 STOP T203 RESTART T200 6.0
} _ DL-DATA-REQUEST DATA INTO lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . { I FRAME IN QUEUE V(S) \| \| (A)+k	lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . I QUEUE _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \|

{ REJ \| \| } \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } } } } } _ { REJ }	{ 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 } _ 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 } _ 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) } _ lw(54p) \| lw(36p) \| cw(36p) \| lw(36p) \| cw(36p)	\| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) .
{ REJ \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } \| \| } } } } } _ { REJ \| \| } \| \| } } } } 22	{ REJ response F=1 N(R)=V(S) (Note) \| \| } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 RESTART T203 \| \| } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.0 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.1 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.2 } { MDL-ERR-IND(A) V(A)=N(R) STOP T200 START T203 7.3 } _ 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 } _ 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 Fascicle VI.10 -- Rec. Q.921

{ I \| \| } \| \| }	{ 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	7.0
} \| \| \| \| } \| \| \| \| \| \| } \| \| \| \| 7.4 } \| \| \| \| \| \| \| \| }	} { ``DISCARD'' TX RNR F=1 STOP T200 RESTART T203 V(A)=N(R) \| \| \| \| } { 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) \| \| \| \| 7.4 } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .	.
{ I \| \| } \| \| } } \| \| \| \| \| \| } \| \| \| \| \| \| } \| \| \| \| 7.4 } \| \| \| \| \| \| \| \| \| \| }	{ 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 } { ``DISCARD'' STOP T200 RESTART T203 V(A)=N(R) \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| \| \| 7.4 } { ``DISCARD'' V(A)=N(R) \| \| \| \| \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .	.
{ I \| \| } } \| \| 28	{ I command P=1 N(S) ¹ V(R) N(R) = V(S) \| \| } { ``DISCARD'' TX REJ F=1 STOP T200 RESTART T203 V(A)=N(R) 7.1 } { ``DISCARD'' TX RR F=1 STOP T200 RESTART T203 V(A)=N(R) \| \| Fascicle VI.10 -- Rec. Q.921

{ DL-RELEASE-REQUEST \| \| } { DISC. I QUEUE RC=0 TX DISC P=1	RESTART T200 6
} _ DL-DATA-REQUEST DATA INTO cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . { I FRAME IN QUEUE V(S) \| \| (A)+k	lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . I QUEUE _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \|

	}		_
				Table Fascicle VI.10	Table D-3/Q.921 (1 of 10) [1T21.921], p. -- Rec. Q.921 35

\| \| }		{ DL-EST-IND MDL-ERR-IND(F) DISC. I QUEUE V(S,R,A)=0 TX UA F=0 STOP T200 START T203 7.0
} \| } \| }		_ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . DISC P=1 \| { DL-REL-IND DISC. I QUEUE TX UA F=1 STOP T200 4 _ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . DISC P=0 \| { DL-REL-IND DISC. I QUEUE TX UA F=0 STOP T200 4 _ Table D-3/Q.921 (2 of 10) [2T21.921], p.
36		Fascicle VI.10 -- Rec. Q.921

} { FRMR response rejecting S frame }		_ lw(54p) \| lw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . _ lw(54p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) \| cw(36p) . FRMR
response rejecting FRMR / /		/ / / / / / _ Table D-3/Q.921 (3 of 10) [4T21.921], p.
38 Fascicle VI.10 -- Rec. Q.921

	\| \| }		{ 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

	\| \| }		{ TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 5.1
	} } } }		{ TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 5.1 { TX RR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 5.1 { TX RNR F=1 MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 5.1 _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) .

\| \| }		{ MDL-ERR-IND(J) RC =0 TX SABME P=1 RESTART T200 5.1
} N(R)		_ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . RR response F=0 error _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . RR

	\| \| }		{ 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

} N(R) error response F=1 N(R) error		_ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . REJ response F=0 _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| lw(36p) . REJ _ Table D-3/Q.921 (5 of 10) [6T21.921], p.
40 Fascicle VI.10 -- Rec.	Q.921

{ 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)		_ 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)

	\| \| }		{ 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

{ I \| \| } \| \| }	{ 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	8.0
} \| \| \| \| } \| \| } } \| \| \| \| }	} { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| } { 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) 8.4 } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p)	\| lw(36p) \| lw(36p) \| cw(36p) .
{ I \| \| } \| \| } } \| \| V(A)=N(R) \| \| \| \| } \| \| } } \| \| \| \| \| \| }	{ 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 } { ``DISCARD'' \| \| V(A)=N(R) \| \| \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) \| \| } { V(R)=V(R)+1 DL-DATA-IND TX RR F=0 V(A)=N(R) 8.4 } { ``DISCARD'' V(A)=N(R) \| \| \| \| \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p)	\| lw(36p) \| lw(36p) \| cw(36p) .
{ I \| \| } } \| \| } \| \| } } \| \| } \| \| }	{ I command P=1 N(S) ¹ V(R) N(R) = V(S) \| \| } { ``DISCARD'' TX REJ F=1 V(A)=N(R) 8.1 } { ``DISCARD'' TX RR F=1 V(A)=N(R) \| \| } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| } { ``DISCARD'' TX REJ F=1 V(A)=N(R) 8.5 } { ``DISCARD'' TX RR F=1 V(A)=N(R) \| \| } { ``DISCARD'' TX RNR F=1 V(A)=N(R) \| \| } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p)	\| lw(36p) \| lw(36p) \| cw(36p) .
{ I \| \| } 42	{ I command P=0 N(S) ¹ V(R) N(R) = V(S) \| \| } { ``DISCARD'' TX REJ F=0 V(A)=N(R) 8.1 Fascicle VI.10 -- Rec. Q.921

} \| \| \| \| }		{ ``DISCARD'' V(A)=N(R) { ``DISCARD'' TX REJ F=0 V(A)=N(R) 8.5
} \| \| \| \| }		{ ``DISCARD'' V(A)=N(R) _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .

	\| \| } { V(R)=V(R)+1 DL=DATA=IND TX RR F=1 MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200 5.1 } { ``DISCARD'' TX RNR F=1 MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200 \| \| 5.1 } { V(R)=V(R)+1 DL=DATA=IND TX RR F=1 MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200 5.1	5.1
	} { ``DISCARD'' TX RNR F=1 MDL-ERR-INJ(J) RC = 0 TX SABME P=1 RESTART T200 \| \| 5.1 } _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) . Fascicle VI.10 -- Rec.	Q.921 45

	\| \| }		{ ``DISCARD'' TX REJ F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1
	} } } } } }		{ ``DISCARD'' TX RR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1 { ``DISCARD'' TX RNR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1 { ``DISCARD'' TX REJ F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1 { ``DISCARD'' TX RR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1 { ``DISCARD'' TX RNR F=1 MDL-ERR-IND(J) RC = 0 TX SABME P=1 RESTART T200 5.1 _ lw(54p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| lw(36p) \| cw(36p) .

	\| \| }		{ either V(S)=V(S)--1 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)--1 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
	\| \| \| \| \| \| \| \| \| \| }		_ lw(54p) \| lw(36p) \| cw(36p) \| lw(36p) \| cw(36p) \| lw(36p) \| lw(36p) \| cw(36p) \| cw(36p) .

I.1		Introduction This appendix describes an optional procedure which may be used to provide a reject retransmission procedure.
I.2		Procedure This optional reject retransmission procedure can supplement the Q.921 LAPD protocol by defining a new variable for multiple frame

} lw(48p) \| lw(24p) \| lw(48p) \| lw(48p) .	Unable to convert table	_ lw(36p) \| lw(24p) \|
		Table II-1/Q.921 [T22.921] + Notes, p.
Blanc 52 Fascicle VI.10 -- Rec. Q.921

The timer	The timer TM20 is set to 2.5 seconds and NM20 is set to 3.
60 Fascicle	VI.10 -- Rec. Q.921		Figure IV-3/Q.921 [T23.921], p.

Abbreviation Meaning of acronym Ai Action indicator ASP Assignment source point	point
CEI Connection endpoint identifier CES Connection endpoint suffix C/R Command/response field bit DISC Disconnect DL- Communication between Layer	identifier suffix field bit between Layer 3 and data link layer
DLCI Data link connection identifier DM Disconnected mode EA Extended address field bit	identifier field bit
ET Exchange termination FCS Frame check sequence FRMR Frame reject I Information ID Identity ISDN Integrated Services Digital	Digital Network
L1 Layer 1 L2 Layer 2 L3 Layer 3 LAPB Link access procedure	-- Balanced
LAPD Link access procedure M Modifier function bit MDL- Communication between MPH- Communication between N(R) Receive sequence number N(S) Send sequence number P/F Poll/Final bit PH- Communication between data	on the D-channel bit between management entity and data link layer between system management and physical layer number number between data link layer and physical layer

		References
[1] [2] [3] [4] [5] [6]		CCITT Recommendation Q.920 (I.440), ISDN user-network interface data link layer -- General aspects . CCITT Recommendation Q.930 (I.450), ISDN user-network interface layer 3 -- General aspects . CCITT Recommendation Q.931 (I.451), ISDN user-network interface layer 3 specification . CCITT Recommendation I.430, Basic user-network interface layer 1 specification . CCITT Recommendation I.431, Primary rate user-network interface layer 1 specification . CCITT Recommendation X.25, Interface between data terminal equipment (DTE) and data circuit terminating equipment (DCE) for