Lucent Technologies DEFINITY Extender Switch Module System Administrators Guide

							Troubleshooting
4-10   Issue 3   July 1997 8. If there is a ring but no answer, do the following:
a. Check the telephone number.
b. Check the power for the Switch Module.
c. Check the lines at the Switch Module.
Modules Retrain Too Often
When the Switch or Remote Modules retrain too often, the quality
of the line is questionable. To correct this problem, answer or do
the following:
1. Has the telephone company done any changes in the office or
home?
2. Verify that the cables are okay and that all connections are
correct.
3. Have the telephone company condition the lines as necessary.
4. Compare each module with a known good telephone if
possible. The module may be defective.
Connect Rate Too Low
To correct this problem, do the following:
1. Check that the telephone lines are within specifications.
Telephone line quality may be an issue. Check with the local
telephone company for available options. 
						

							Troubleshooting
Issue 3   July 1997   4-11
2. Check the baud rate setting in the programming menu. It can
be set for “Auto,” “F” (19.2 K), “M” (16.8 K), or “S”
(14.4 K).
Dedicated Line Problems
Dedicated lines experience many of the same problems as normal
dial lines. The difference in operation is the connect sequence.
There is no call progress such as dial tone or ringing. When you
select “Go Online,” the Remote Module sends out a calling tone
that initiates the train sequence from the Switch Module.
No Connection/No Answer
Tone
To correct this problem, do the following:
1. Does the display on the telephone say “Go Online”? Then press
2 to start the session.
2. Check the power connection on the Switch Module.
3. Check the LED on the Switch Module and compare it to the
LED diagnostic sheet. The Switch Module may be defective.
4. Check that the DIP switches on the Switch and Remote
Modules are set for a dedicated line (DIP switch #2 should be
ON).
5. Go on-line and monitor the call progress on the Remote Module
speaker. 
						

							Troubleshooting
4-12   Issue 3   July 1997 6. If there is no train sequence, do the following:
a. Check the cables on the Remote Module, and replace or
rewire them as needed.
b. Check the cables on the Switch Module, and replace or
rewire them as needed.
c. Has the cable between the locations been cut?
d. Is the T1 link between the units still up?
e. Check if the circuit is configured to look for loop current
(as in an FSO/FXS application). The telephone company
must reconfigure the circuit.
System Drops Calls
The problem of the system dropping calls can occur on dial lines
and dedicated lines. Follow these steps to correct the problem:
1. Lower the connect rate. From the Connect Rate menu, change
the setting from “Auto” to “m” or “s.” The lower rate will improve
reliability
NOTE:
Speech quality degrades at 14.4 K.
2. Turn off the Call Waiting feature. The Call Waiting tone
interrupts data. 
						

							Troubleshooting
Issue 3   July 1997   4-13
3. Disconnect additional telephones. The presence of other
telephones, answering machines, etc. on the line may cause
noise or extra non-linearity.
4. Check the wiring. If the module goes into retrain when a call is
received on a central office line, the wiring may need to be
modified to eliminate crosstalk. This can be a problem in-house
or at the telephone company.
5. Reposition wiring to eliminate possible interference. If the wiring
is too close to or on top of an air conditioner, a photocopier, or a
power transformer, interference may be generated on the line.
6. Check if voice compression equipment is used on the facility.
The Extender system does not work with voice compression
equipment.
7. Condition the line. Set the echo return loss (ERL) for minimum
echo. You may have to install a precision balanced network to
do this. 
						

							Issue 3   July 1997   GL-1
Glossary
+12 vdc
12 volt direct current.
120 vac
120 volt alternating current (North American standard electrical supply).
B
Baud Rate
The speed in kbps at which digital data can be transmitted.
D
Direct Line
A dedicated circuit or private leased line.
Dedicated Subscriber Lines
Communication lines (usually twisted pair) that are used to connect on-
premise telephone equipment (such as a PBX) to the Central Office. Also
referred to as direct lines. 
						

							Glossary
GL-2   Issue 3   July 1997
Dial Line
A telephone line which is part of the Public Switched Telephone Network
and is accessed through the DEFINITY Extender’s automatic dial-up
function.
F
Facility
Transmission facilities. Usually a two metallic pair set of cords, but can be
telephone company carriers, T-1, microwave or dial-up
telecommunications lines.
L
LED
Light-emitting diode. A semiconductor diode which emits light when a
current is passed through it, indicating that the power is on.
M
Multi-Mount Rack
A card frame with spaces for 12 Rack-Mount Modules. Each Rack-Mount
Module functions like a Standalone Switch Module. 
						

							Glossary
Issue 3   July 1997   GL-3
O
On-premise Lines
Communication lines (usually twisted-pair) that are used to connect the
PBX to the DEFINITY telephone.
P
PBX
Private Branch Exchange.
R
Rack-Mount Switch Module
An interface card that fits into one of the 12 slots in the Multi-Mount
Extender Rack. The Rack-Mount Switch Module has all the functionality of
the Standalone Switch Module.
Remote Module
The DEFINITY Extender
 module that connects to the remote DEFINITY
telephone. 
						

							Glossary
GL-4   Issue 3   July 1997
S
Standalone Switch Module
A single enclosed Switch Module; contrast with a Multi-Mount Rack
Switch Module
The DEFINITY Extender module that connects to the DEFINITY PBX.