Ni-1 Bri Timers - Lucent Technologies MERLIN LEGEND Release 6.0 System Planning Manual

MERLIN LEGEND Communications System Release 6.0
System Planning 555-660-112
3 Lines/Trunks
Selecting Line/Trunk Options
Timers
Timers ensure that the system takes the appropriate corrective action when the
expected response is not received from the network during normal operation.
! !
CAUTION: CAUTION:
Since incorrect settings can hinder the operation of BRI facilities, consult
with an Lucent Technologies representative or authorized dealer before
making changes. The factory-set thresholds are standard settings and
should rarely be changed.
The timers, descriptions, factory settings, and allowable thresholds are shown in
Table 3-5.
Planning Form Instructions
On Form 3i, Incoming Trunks: BRI Options (800 NI-BRI Module), under the
"Timers and Counters" heading on page 2:
1. For each timer:
Table 3-5.

NI-1 BRI Timers

Name Description
T200 The minimum time which Layer 2 must wait for
an acknowledgment of a link establishment
frame, an information frame, or a polling
supervisory frame, before initiating
retransmission procedures.
T203 The maximum time for which the Layer 2
link can remain inactive.
T303 The delay in CO response after the system
has sent a SETUP message to initiate an
outgoing call.
T305 The delay in response from the CO after the
system has initiated a DISConnect message
for call clearing.
T308 The delay in response from the CO after the
system has sent a RELease message for call
clearing.
To keep the factory setting, check the first box under the timer name.
To change the factory setting, check the second box under the timer
name and write the new threshold in the space provided.
3
Factory Allowable
Setting Threshold
1,000 ms 500 5,000 ms in
increments of 500 ms
33 seconds 10–255 seconds in
increments of 1 second
4 seconds 2–10 seconds in
increments of 1 second
30 seconds 2 60 seconds in
increments of 1 second
4 seconds 2 10 seconds in
increments of 1 second
Issue 1
February 1998
Page 3-50
3