Bri Timers - AT&T MERLIN LEGEND Reference

System Programming

BRI Timers

The programmable times on the 800 CO-BRI module set the time limits for
waiting for responses from the central office (CO). When no response is received
f r o m t h e C O , t h e s y s t e m t a k e s t h e a p p r o p r i a t e c o r r e c t i v e a c t i o n .
The factory settings for these timers are standard and rarely need to be
changed. If you are not sure of the correct timer settings for your BRI lines,
check with your authorized support representative before you make a
change.
Incorrect settings can cause the BRI lines to malfunction.
Follow these procedures to program the timers on the 800 CO-BRI module.
The timers are:
T200 Timer—the minimum time which Layer 2 must wait for an
acknowledgment of an information frame before initiating retransmission
procedures.
T203 Timer—the maximum time for which the Layer 2 link can remain
active.
T303 Timer—the amount of time the system waits for the CO to respond
when the system sends a SETUP message to initiate an outgoing call.
Corrective action is taken if the timer expires before the CO responds with
either a SETUP Acknowledge or a call Proceeding message.
T305 Timer—the amount of time the system waits for the CO to respond
when the system initiates a Disconnect message for call clearing.
Corrective action is taken if the timer expires before the CO responds with
either a Disconnect or RELease message.
T308 Timer—the amount of time the system waits for the CO to respond
when the system sends a RELease message for call clearing. Corrective
action is taken if the timer expires before the CO responds with a
RELease COMplete message.
NOTE:
If you enter an invalid timer value, the number you enter is truncated to the
closest valid value. For example, if you enter 45 for a timer that ranges from O
through 30, 4 is recorded.
BRI Timers
5-10