Compensating For Slow Dial Tone (International) - Lucent Technologies MERLIN LEGEND Release 5.0 System Planning Manual

MERLIN LEGEND Communications System Release 5.0
System Planning 555-650-112
3 Lines/Trunks
Selecting Line/Trunk Options
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:
Table 3-5. NI-1 BRI Timers
Name Description
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.
T203 The maximum time for which the Layer 2
link can remain inactive.
T303 The delay in CO response after the system
has sent a SETUP message to initiate an
outgoing call.
T305 The delay in response from the CO after the
system has initiated a DISConnect message
for call clearing.
T308 The delay in response from the CO after the
system has sent a RELease message for
call clearing.
Compensating for Slow Dial Tone
If this system is being installed outside of the US , problems can arise because of
slow dial tone from local telephone companies due to the limitations of their
switching equipment. If this is the case, be aware of the following:
Users should be instructed to wait for dial tone before they dial. (Due to
changes made to internal timers, the system will allow the delay.)
The following features cannot be used:
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.
(International)3
— Automatic Route Selection
— Remote Call Forwarding
— Remote Access (outgoing)
Factory Allowable
Setting Threshold
1,000 ms 500 5,000 ms in
increments of 500 ms
33 seconds 10–255 seconds in
increments of 1 second
4 seconds 2–10 seconds in
increments of 1 second
30 seconds 2 60 seconds in
increments of 1 second
4 seconds 2 10 seconds in
increments of 1 second
Issue 1
June 1997
Page 3-44