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Chapter 5 Parameter Definitions
5.3
Signaling Gateway Timers
5.3.1
Signaling Gateway-Specific Timers
Table 4
shows the Signaling Gateway specific timers. Timers for specific protocols are given in subsequent
tables in this section.
5.3.2
MTP3-Specific Timers
MTP3 ITU timers are given in
Table 5
.
MTP3 ANSI timers are given in
Table 6
.
Table 4. Signaling Gateway Specific Timers
T0
Range
(seconds)
Default
(seconds)
Description
5
5 to 20
7
Wait for board response guard timer. This timer starts when internal
messages are sent to a signaling board and stopped when an
acknowledgement is received. On timer expiry, it reports an error. If the
internal message sent to a board related to setting up a speech path for a
call, then the call is released using internal token 135.
7
2 to 10
3
MML wait for maintenance confirmation timer. The timer is started when a
MML maintenance request is performed. It is stopped when a confirmation
from the remote site to the maintenance request is received. On timer
expiry, a confirmation to the request is internally generated allowing
further MML commands to be entered.
Table 5. MTP3 ITU Timers
TO
Range
(milliseconds)
Default
(milliseconds)
Description
1
500 to 1200
1000
Delay to avoid message mis-sequencing on changeover
2
700 to 2000
1500
Waiting for changeover acknowledgement
3
500 to 1200
1000
Time controlled diversion-delay to avoid mis-sequencing on
changeback
4
500 to 1200
1000
Waiting for changeback acknowledgement (first attempt)
5
500 to 1200
1000
Waiting for changeback acknowledgement (second attempt)
6
500 to 1200
1000
Delay to avoid message mis-sequencing on controlled rerouting
10
30 to 60 sec.
45 sec.
Waiting to repeat signaling route set test message
12
800 to 1500
1200
Waiting for uninhibit acknowledgement
13
800 to 1500
1200
Waiting for force uninhibit
14
2000 to 3000
3000
Waiting to start signaling route set congestion test
17
800 to 1500
1000
Delay to avoid oscillation of initial alignment failure and link
restart
22
180 to 360 sec.
270 sec.
Local inhibit test timer
23
180 to 360 sec.
270 sec.
Remote inhibit test timer
24
N/A
N/A Reserved
Table 6. MTP3 ANSI Timers
TO
Range
(milli-
seconds)
Default
(milliseconds)
Description
1
500 to 1200
1000
Delay to avoid message mis-sequencing on changeover
2
700 to 2000
1500
Waiting for changeover acknowledgement
3
500 to 1200
1000
Time controlled diversion-delay to avoid mis-sequencing on
changeback
4
500 to 1200
1000
Waiting for changeback acknowledgement (first attempt)
5
500 to 1200
1000
Waiting for changeback acknowledgement (second attempt)
