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MODEM 325 AND MODEM 325 CARD
Appendix B: Fault Isolation Procedure
This diagnostic test procedure and the indicator lights built into the modem allow a rapid check of the
terminals, modems, and telephone-line interface. This procedure can be used to verify normal system
operation and to isolate faulty equipment in case of failure.
Make sure the units are turned on and remote loops are enabled at both sites before starting the fault
isolation procedure.
B.1 Telephone Interface
Connect the modem to the dial-up line via the DIAL jack on the back panel.
• If the dial line is installed with a standard permissive data jack, connect a standard telephone to the
TELSET/LEASED LINE jack on the back panel of the modem and use the standard phone procedure
(
).
Section B.3
• If the dial line is installed with an exclusion key telephone wired for data set controls the line, connect
an exclusion key telephone to the RJ36X jack and use the exclusion-key telephone procedure
(
).
Section B.4
B.2 Standard Phone
Configure the modem to V.32 IDLE mode by pressing the TALK/DATA button, and then lift the receiver.
No dial tone is heard. Press the TALK/DATA button to display V.32 TALK and wait for dial tone.
Dial out; the phone should operate normally.
B.3 Exclusion-Key Telephone
Configure the modem to V.32 IDLE mode, lift the receiver of the exclusion key telephone and place the
telephone in talk mode. Wait for the dial tone. Placing the telephone in data mode silences the tone.
With the telephone in talk mode, dial out. The telephone should operate normally.
If the telephone interface procedures are successful, the telephone interface is operating properly.
B.4 Fallback Rates
Since there is no standard fallback procedure from V.32 rates to V.22 rates, problems may arise when a
V.32 optioned for 9600 originates a call to a V.22 modem. If this is a problem, change the originate
modem speed to 2400 bps from the front panel or with the AT command AT%B3.
138
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