AT&T MERLIN LEGEND Release 3.1 System Programming Manual page 560

BRI Facilities
The timers are listed below.
T200 Timer. Minimum time that the link layer waits for an
acknowledgement of a message sent from the communication system to
the network.
T203 Timer. Maximum time that the link layer can remain inactive.
T303 Timer. Times the delay in network response when the
communication system sends a setup message to initiate an outgoing
call.
T305 Timer. Times the delay in network response when the
communication system sends a disconnect message to clear a call.
T308 Timer. Times the delay in network response when the
communication system sends a release message to clear a call.
NOTE:
If you enter an invalid timer value, you will hear an error beep and the value that
was previously stored will be displayed on the screen.
Table 4–4 shows the factory setting for each timer and the valid range for each
threshold.
Summary: Timers
Programmable by
Mode
Idle Condition
Planning Form
Factory Setting
Valid Entries
Inspect
Copy Option
Console Procedure
PC Procedure
4–188
Programming Procedures
System manager
Key, Hybrid/PBX
Not required
See Table 4–4
See Table 4–4
No
No
LinesTrunks
More
Dial no. of seconds or ms
no. of seconds or ms
BRI Timers
Select timer
Enter Exit
Select timer +
Drop
Exit
2
Type