Specifications

Chapter 6: Programming
Configuring a Single-Port/Dual-Port T1/E1/PRI Module (T1M/T1M-2)
Mitel
®
5000 Installation Manual – Issue 3.0, October 2008 Page 6-125
Timers
(Timers are programmed only for PRI-equipped modules). The ISDN timer default values, listed
in Table 5-12, have been carefully selected to ensure proper system operation under most
circumstances. Occasionally, one or more of the timers may need to be adjusted.
To program a timer:
1. Select the current Value, and then enter the new value in the text box.
2. Press ENTER or click another field to save the change.
Table 6-20. PRI-Equipped Module Timers
Timer Default Range Purpose
Call Proceeding (T310) 25 1–255
sec
This is used for AT&T 5ESS custom switch type only. If the
appropriate Call Proceeding response (Alerting, Connect, or
Disconnect) is not received before this timer expires, the
requesting system sends a Disconnect.
Connect Ack. (T313) 9 1–255
sec
If the appropriate Call Proceeding response (Alerting, Connect,
or Disconnect) is not received before this timer expires, the
requesting system sends a Disconnect.
Data Link
Disconnect (T309)
90 1–255
seconds
(T1/PRI Only) This timer is initiated when the data link layer is
disconnected. The timer is terminated when the data link is re-
established.
Disconnect (T305) 4 1–255
sec
If the appropriate Disconnect response (Disconnect or Release)
is not received before this timer expires, the requesting system
sends a Release.
Idle Link (T203) 100 1–65535
tenths
This timer controls how long the ISDN Data Link layer will
remain idle before transmitting a Receive Ready (RR)
Supervisory frame or an information frame, once multi-frame
operation has been established.
Overlap Receiving
(T302)*
15 1–255
sec
This timer determines the number of seconds that the system
will wait between messages during the overlap receiving
process. This timer is started whenever the system receives a
setup acknowledge message. It is then restarted every time the
system receives an information message during the overlap
receiving process. Once the last information message is
received, the system has until this timer expires to send a call
progress message (for example, alerting, connected, etc.). If
the system does not send a call progress message or if the
system does not receive an information message before this
timer expires, the call is cleared.
Overlap Sending
(T304)*
20 1–255
sec
This timer determines the number of seconds that the system
will wait between messages during the overlap sending
process. This timer is started when the system receives the
setup acknowledge message from the network provider. It is
then restarted every time the system sends an information
message during the overlap sending process. Once the last
information message is sent, the system waits for a call
progress message (for example, alerting, connected, etc.) from
the network provider. If the system does not receive a call
progress message or if the system does not send an
information message before this timer expires, the call is
cleared.
* Currently, the overlap sending/receiving protocols are supported with PRI Net 5 and BRI Net 3 switch types,
which are prevalent in the Europe and Mexico markets.