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1991-12-31
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ANNEX A
(to Recommendation Q.764)
Timers used in Recommendation Q.764 (Sheet 1 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T1 4-15 s Local When release At the receipt of Retransmit Same as the first
message is sent release complete release message expiry
message and reinitialize
timer T1
T2 3 min Dual When At the receipt of Initiate -
controlling resume (user) release
exchange message at procedure
receives suspend controlling
(user) message exchange
T3 3 min Dual When local When hold Initiate -
exchange sends condition is release
delayed release removed procedure
message
T4 4-15 s Dual When local
Fascicle VI.8 - Rec. Q.764
PAGE1
exchange sends At the reception -
call call modification
modification complete message
request message
T5 1 min Local When initial At receipt of Send reset The sending of
release message release complete circuit message, the de reset
is sent message alert circuit message
maintenance should continue at
personnel, and 1-min intervals
remove the until maintenance
circuit from intervention
service occurs
T6 Covered in Dual When At the receipt of Initiate -
Q.118 controlling resume (network) release
exchange message procedure
receives suspend
(network)
PAGE6 Fascicle VI.8 - Rec. Q.764
Timers used in Recommendation Q.764 (Sheet 2 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T7 20-30 s Dual When the latest When the Release all -
address message condition for equipment and
is sent normal release of connection (Send
address and release message)
routing
informations is
met (receipt of
ACM, CON,
messages)
T8 10-15 s Local When transit of At receipt of Release all -
incoming continuity message equipment and
international connection into
exchange national network
receives initial (Send release
adress message message)
T9 Interval Dual When national At the receipt of Release -
specified controlling or answer connection send
in Q.118 outgoing back release
international message
exchange sends
latest address
message after
the receipt of
ACM
T10 4-6 s Dual When last digit
Fascicle VI.8 - Rec. Q.764
PAGE1
is received in At the receipt of Send address -
interworking fresh information complete message
situations
T11 15-20 s Dual When latest Send ACM Send address -
address message complete message
is received in
interworking
situations
PAGE6 Fascicle VI.8 - Rec. Q.764
Timers used in Recommendation Q.764 (Sheet 3 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T12 4-15 s Local When blocking At receipt of Retransmit Same as the left
message is sent blocking blocking message until T13 expires
acknowledgement and initiate T12
T13 1 min Local When initial At receipt of Retransmit The reception of
blocking message blocking blocking message message should be
is sent acknowledgement and alert continued until
maintenance maintenance
personnel and intervention
start T13. Stop occurs and circuit
T12 taken out of
service as
appropriate
T14 4-15 s Local When unblocking At receipt of Retransmit Same as the left
message is sent unblocking unblocking until T15 expires
acknowledgement message and
initiate T14
timer
T15 1 min Local When initial
Fascicle VI.8 - Rec. Q.764
PAGE1
unblocking At receipt of Retransmit The repetition of
message is sent unblocking unblocking message should be
acknowledgement message alert continued until
maintenance maintenance
personnel, start intervention
T15 timer and occurs and circuit
stop T14 taken out of
service as
appropriate
T16 4-15 s Local When reset At the receipt of Retransmit Same as the left
circuit message the reset circuit until T17 expires
is sent acknowledgement message and
(RLC message) restart T16
T17 1 min Local When initial At receipt of the Alert The repetition of
reset circuit acknowledgement maintenance message should be
message is sent personnel continued until
retransmit reset maintenance
circuit message, intervention
restart T17 and occurs
stop T16
PAGE6 Fascicle VI.8 - Rec. Q.764
Timers used in Recommendation Q.764 (Sheet 4 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T18 4-15 s Local When group At receipt of Retransmit Same as the left
blocking message group blocking group blocking until T18 expires
is sent acknowledgement message and
initiate T18
T19 1 min Local When initial At receipt of Retransmit The repetition of
group blocking group blocking group blocking message should be
message is sent acknowledgement message, alert continued until
maintenance maintenance
personnel, intervention
initiate T19 and occurs and
stop T18 circuits taken out
of service as
appropriate
T20 4-15 s Local When group At receipt of Retransmit Same as the left
unblocking group unblocking group unblocking until T20 expires
message is sent acknowledgement message and
initiate T20
T21 1 min Local When initial
Fascicle VI.8 - Rec. Q.764
PAGE1
group unblocking At receipt of Retransmit The repetition of
message is sent group unblocking group unblocking message should be
acknowledgement message, alert continued until
maintenance maintenance
personnel, intervention
initiate T21 and occurs and
stop T20 circuits taken out
of service as
appropriate
T22 4-15 s Local When circuit At the receipt of Retransmit Same as the first
group reset the circuit group expiry until T23
message is sent acknowledgement reset message expires
and restart T22
PAGE6 Fascicle VI.8 - Rec. Q.764
Timers used in Recommendation Q.764 (Sheet 5 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T23 1 min Local When initial At the receipt of Alert The reception of
circuit group the maintenance message should be
reset message is acknowledgement personnel and continued until
sent restart Timer maintenance
T23. Retransmit intervention
circuit group occurs
reset message.
Stop timer T22
T24 < 2 s Local When check tone At the receipt of Report failure -
is sent backward check
tone
T25 1-10 s Local When continuity - Send CCR -
check failure is message
detected (on
receipt of
continuity
recheck request)
T26 1-3 min Local When second
Fascicle VI.8 - Rec. Q.764
PAGE1
continuity check - Send CCR -
failure is message
detected
T27 4 min Local When continuity At receipt of Return to idle -
recheck request continuity check
is requested request message
T28 10 s Local When send CQM At receipt of CQR Alert -
maintenance
PAGE6 Fascicle VI.8 - Rec. Q.764
Timers used in Recommendation Q.764 (Sheet 6 of 6)
Symbol Time-out Cause for Normal At the first At the following
value Significanc initiation termination expiry expiry
e
T29 300-600 ms Local First - - -
congestion/first
congestion
indication after
T30 expires
T30 5-10 s Local First - - -
congestion
indication
T31 > 6 min Local Release of ISDN On expiry - Call reference
User part reusable
signalling
connection based
on CO SCCP
T32 3-5 s Local On receipt of
Fascicle VI.8 - Rec. Q.764
PAGE1
end-to-end On expiry - End-to-end
message message to be sent
T33 12-15 s Local When send INR On receipt of INF Release call -
T34 12-15 s Local When send On receipt of Maintenance -
circuits group circuits group action
query query response
PAGE6 Fascicle VI.8 - Rec. Q.764
