TABLE 1/Q.791
Monitoring and measurements for Signalling System No. 7
networks MTP – signalling link performance

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
1.1	Duration of Link in the In–Service State	secs/SL b)	O		A	M			30 min.	2	Yes	perm.		
1.2	SL Failure–All Reasons	event/SL		M			on occur.	2	Yes			
1.3	SL Failure–Abnormal – FIBR/BSNR	event/SL		M			on occur.	2	No	perm.	Q.703, § 5.3	
1.4 	SL Failure–Excessive delay of ack.	event/SL		M			on occur.	2	No		Q.703, § 5.3.1	
1.5 	SL Failure–Excessive error rate	event/SL		M			on occur.	2	No		Q.703, § 11.2.2	
1.6 	SL Failure–Excessive duration of congestion	event/SL		M			on occur.	2	No		Q.703	
1.7	SL alignment failure	events/SL		M			30 min.	2	No		Q.703, § 11.3	
1.8 	Number of Signal Units in error c)	events/SL		M			30 min.	2	Yes 	perm.	Q.703, § 4	
1.9 	Number of negative ack. received	events/SL		M			30 min.	2	No			
1.10	Local Automatic changeover	events/SL event/SL	O	M			30 min.
on occur.	3
3	No
No		Q.704, § 5	
1.11	Local Automatic changeback	event/SL	O	M			on occur.	3	No		Q.704, § 6	
1.12	SL Restoration	event/SL		M			on occur.	3	No		Q.703, § 3.2.3	
										
	a)	See § 3.1.2 (applies to all tables).
	b)	SL = Signalling Link.
	c)	The interpretation of this count is implementation dependant.

TABLE 2/Q.791
Monitoring and measurements for Signalling System No. 7
networks – MTP signalling link availability

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
2.1 	Duration of SL unavailability (for any reason)	secs/SL	O		A	M			30 min.	3	Yes	 perm.		
2.2–2.4  Deleted										
2.5	Duration of SL inhibition due to local management actions	secs/SL		M			30 min.	3	No		Q.704, § 3.2.8	
2.6	Duration of SL inhibition due to remote management actions	secs/SL		M			30 min.	3	No		Q.704, § 3.2.8	
2.7	Duration of SL unavailability due to link failure	secs/SL		M			30 min.	3	No		Q.704, § 3.2.2	
2.8 	Deleted.										
2.9 	Duration of SL unavailability due to remote processor outage	secs/SL	O	M			30 min.	3	No		Q.704, § 3.2.6	
2.10	Start of remote processor outage	event/SL	O	M			on occur.	3	No		Q.704, § 3.2.6	
2.11	Stop of remote processor outage	event/SL	O	M			on occur.	3	No		Q.704, § 3.2.7	
2.12	Deleted										
2.13	Local Management Inhibit	events/SL events/SL	O	M			30 min.
  5 min.	3
3	No
No		Q.704, § 10.2	
2.14	Local Management Uninhibit	events/SL events/SL	O	M			30 min.
  5 min.	3
3	No
No		Q.704, § 10.3	
2.15	Duration of Local Busy	secs/SL	O			30 min.	2	No		Q.704, § 9.3	

TABLE 3/Q.791
Monitoring and measurements for Signalling System No. 7 networks
MTP signalling link utilization

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
3.1	Number of SIF and SIO octets transmitted	octets/SL	O		A	M			30 min.	3/2	Yes	act.	Q.703, § 2.3.8	
3.2 	Octets retransmitted	octets/SL		A			30 min.	2	No		Q.703, § 5	
3.3	Number of message signal units transmitted	MSUs/S		A			30 min.	3/2	No			
3.4	Number of SIF and SIO octets received	octets/SL	O		A	M			30 min.	3/2	Yes	act.		
3.5	Number of message signal units received	MSUs/SL		A			30 min.	3/2	No			
3.6	SL congestion indications	events/SL events/SL event/SL	O	A	M
O			30 min.
  5 min.
on occur.		No
No
No		Q.704, § 3.8	
3.7	Cumulative duration of SL congestion	secs/SL	O	A	M			30 min.	3	No			
3.8	Deleted										
3.9	Stop of SL congestion	event/SL	O			on occur.	3	No			
3.10	MSUs discarded due to SL congestion	MSUs/SL	O			30 min.	3	Yes	perm.		
3.11	Number of congestion events resulting in loss of MSUs	events/SL event/SL	O	M			30 min.
on occur.	3
3	No
No			

TABLE 4/Q.791
Monitoring and measurements for Signalling System No. 7 networks
MTP signalling link set and route set availability

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
4.1	Deleted										
4.2	Duration of unavailability of signalling linkset	secs/linkset	O	M
			30 min.	3	No			
4.3	Start of linkset failure	event/linkset	O	M			on occur.	3	No			
4.4	Stop of linkset failure	event/linkset	O	M			on occur.	3	No			
4.5	Initiation of broadcast TFP due to failure of measured linkset a)	event/linkset	O	M
			on occur.	3	No		Q.704, § 13	
4.6	Initiation of broadcast TFA for recovery of measured linkset a)	event/linkset	O	M			on occur.	3	No		Q.704, § 13	
4.7 – 4.8   Deleted										
4.9	Unavailability of route set to a given destination of set of destinations	events/destina-tion(s)	O	A	M			30 min.	3	b)	perm.	Q.704, § 11.2.1	
4.10	Duration of unavailability in 4.9	secs/destination(s)	O	A	M			30 min.	3	b)	perm.	Q.704, § 11.2.2	
4.11	Start of unavailability in 4.9	event/destination(s)	O	M			on occur.	3	No		Q.704, § 11.2.1	
4.12	Stop of unavailability in 4.9	event/destination(s)	O	M			on occur.	3	No		Q.704, § 11.2.2	
										
	a)	These measurements only apply to Signal Transfer Points.
	b)	These measurements are only obligatory in the international network.

TABLE 5/Q.791
Monitoring and measurements for Signalling System No. 7 networks
MTP adjacent signalling point status accessibility

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
5.1	Adjacent SP inaccessible	event/SP 	O	M
	M			on occur.
30 min.
    5 min.	3	Yes	perm.		
5.2	Duration of adjacent SP inaccessible	events/SP
secs/SP	O
O			   5 min.
30 min.	3	Yes	perm.		
5.3	Deleted			M								
5.4	Stop of adjacent SP inaccessible	event/SP	O	M			on occur.	3	No			

5.5	MSU discarded due to a routing data 	error a)	
MSUs/SP		A
O		M			30 min.
  5 min.		Yes
No	perm.
perm.	Q.795	

								
	a)	The number of MSUs discarded can be used to trigger the MTP Route Verification Test (MVRT) described in Recommendation Q.795, § 2.3.

TABLE 6/Q.791
Monitoring and measurements for Signalling System No. 7 networks
MTP signalling link traffic distribution (Signalling route utilization)

Description of measurements
		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
6.1	Number of SIF and SIO octets received with given OPC	octets/OPC	A			30 min.	3	No			
6.2	Number of SIF and SIO octets transmitted with given DPC	octets/DPC	A			30 min.	3	No			
6.3	Number of SIF and SIO octets handled with given SIO	octets/SIO	A			30 min.	3	No			
6.4	Number of SIF and SIO octets received with given OPC and SIO	octets/SIO/OPC	A			30 min.	3	No			
6.5	Number of SIF and SIO octets transmitted with given DPC and SIO	octets/SIO/DPC	A			30 min.	3	No			
6.6	Number of SIF and SIO octets handled with given OPC, DPC and SIO	octets/SIO/
OPC/DPC	A			30 min.	3	No			
										
	Note 1 – Activation of these measurements is recommended on per point code or sets of point codes and/or SIO.
	Note 2 – Some of these measurements may be of interest for accounting purposes.

TABLE 7/Q.791
Monitoring and measurements for Signalling System No. 7 networks
SCCP performance

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
7.1	Routing Failure – No translation for address of such nature a)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.2	Routing Failure – No translation for this specific address a)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act. 
perm.	Q.714, § 2.4	
7.3	Routing Failure – Network Failure (Point Code not available)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.4	Routing Failure – Network Congestion	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.5	Routing Failure – Subsystem Failure (unavailable)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.6	Routing Failure – Subsystem Congestion b)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.7	Routing Failure – Unequipped user (Subsystem)	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
7.8	Syntax error detected	event
msgs		M
	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 4.3	
7.9	Routing Failure – Reason unknown	event
msgs	O
	A	M			on occur.
30 min.	SCCP
SCCP	Yes	act.
perm.	Q.714, § 2.4	
										
	a)	These measurements only required at SCCP nodes with global title translation capabilities.
	b)	For further study.

TABLE 8/Q.791
Monitoring and measurements for Signalling System No. 7 networks
sub–system availability

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
8.1	Start of local SCCP unavailable failure a)	event	O			on occur.	SCCP	No	perm.		
8.2	Start of local SCCP unavailable – maintenance made busy a)	event	O			on occur.	SCCP	No	perm.		
8.3	Start of local SCCP unavailable – congestion a)	event	O			on occur.	SCCP	No	perm.		
8.4	Stop of local SCCP unavailable – (all reasons) a)	event	O			on occur.	SCCP	No	perm.		
8.5	Duration of local SCCP unavailable – (all reasons) a)	secs	A			30 min.	SCCP	No	perm.		
8.6	Subsystem out–of–service request granted	event		M			on occur.	SCCP	b)	perm.	Q.714, § 5.3.5.3	
8.7	Subsystem out–of–service request denied	event		M			on occur.	SCCP	b)	perm.	Q.714, § 5.3.5.3	
										
	a)	These measurements are system architecture dependent.
	b)	These measurements are obligatory for replicated systems.

TABLE 9/Q.791
Monitoring and measurements for Signalling System No. 7 networks
SCCP – Utilization

Description of measurements		
Units	Usage
O		A	M	
Duration of measurement	
Level	
Obligatory a)	
Act. perm.	
References	
9.1	UDTS message sent	msgs	O	A			30 min.	SCCP	No	perm.	Q.714, § 4.2	
9.2	UDTS message received	msgs	O	A			30 min.	SCCP	No	perm.	Q.714, § 4.2	
9.3	Total messages handled (from local or remote subsystems)	msgs	A			30 min.	SCCP	No	perm.	Q.714, § 2.3	
9.4	Total messages intended for local subsystems	msgs	A			30 min.	SCCP	No	perm.	Q.714, § 2.3	
9.5	Messages requiring global title translation a)	msgs	A			30 min.	SCCP	No	perm.	Q.714, § 2.2	
9.6	Total messages sent (for connectionless only) (by class 0, 1)	msgs/class	A			30 min.	SCCP	Yes	perm.	Q.714, § 1.1.2	
9.7	Total messages received (for connectionless only) (by class 0, 1)	msgs/class	A			30 min.	SCCP	Yes	perm.	Q.714, § 1.1.2	
9.8	Messages sent to a backup subsystem	msgs/SS	A			30 min.	SCCP	Note b)	perm.	Q.714, § 5.3.2	
										
	a)	This measurement is only required at SCCP nodes with global title translation capabilities.
	b)	This measurement is obligatory for replicated systems.