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MERLIN LEGENDCommunications System Release 6.1
System Planning
555-661-112
Issue 1
August 1998
Lines/Trunks
Page 3-48Selecting Line/Trunk Options
3
Timers 3
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 a 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 3
On Form 3i, Incoming Trunks: BRI Options (800 NI-BRI Module), under the
“Timers and Counters” heading on page 2:
1. For each timer:
■ 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.
Table 3–5. NI-1 BRI Timers
If this system is installed outside of the U.S., continue to the next section.
Otherwise, skip to the following section, “Assigning Lines/Trunks.”
Name Description
Factory
Setting
Allowable
Threshold
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.
1,000 ms 500−5,000 ms, in
increments of 500 ms
T203 The maximum time for which the Layer 2
link can remain inactive.
33 seconds 10–255 seconds, in
increments of 1 second
T303 The delay in CO response after the system
has sent a SETUP message to initiate an
outgoing call.
4 seconds 2–10 seconds, in
increments of 1 second
T305 The delay in response from the CO after the
system has initiated a DISConnect message
for call clearing.
30 seconds 2−60 seconds, in
increments of 1 second
T308 The delay in response from the CO after the
system has sent a RELease message for call
clearing.
4 seconds 2−10 seconds, in
increments of 1 second