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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
55 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.
72 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)