Lucent Technologies 6.1 manual Timers

MERLIN LEGENDCommunications System Release 6.1	Issue 1
System Planning 555-661-112	August 1998

3Lines/Trunks

Selecting Line/Trunk Options	Page 3-48
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:

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

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

		Factory	Allowable
Name	Description	Setting	Threshold
T200	The minimum time which Layer 2 must wait	1,000 ms	500−5,000 ms, in
	for an acknowledgment of a link establishment		increments of 500 ms
	frame, an information frame, or a polling
	supervisory frame, before initiating
	retransmission procedures.
T203	The maximum time for which the Layer 2	33 seconds	10–255 seconds, in
	link can remain inactive.		increments of 1 second
T303	The delay in CO response after the system	4 seconds	2–10 seconds, in
	has sent a SETUP message to initiate an		increments of 1 second
	outgoing call.
T305	The delay in response from the CO after the	30 seconds	2−60 seconds, in
	system has initiated a DISConnect message		increments of 1 second
	for call clearing.
T308	The delay in response from the CO after the	4 seconds	2−10 seconds, in
	system has sent a RELease message for call		increments of 1 second
	clearing.

If this system is installed outside of the U.S., continue to the next section.

Otherwise, skip to the following section, “Assigning Lines/Trunks.”