Paradyne COMSPHERE 3825Plus User Manual page 62

COMSPHERE 3825Plus Modem
Symptom
Data scrambled or
unreadable
Missing data during a
transfer transfer
Symptom
Modems do not train-up on
leased lines
Symptom
Modem does not receive a
dial tone
Modem does not go
off-hook and answer an
incoming call incoming call
Modem goes off-hook,
answers, but does not
connect connect
B-2
Table B-2
Online Operation
Verify that the character format (data bits, parity, and stop bits) is set to the same value in
both modems.
Verify that you are using the same method of flow control for both the modem and the DTE.
If using XON/XOFF flow control, verify that the modem's parity matches the DTE's parity.
Table B-3
Leased-Line Operation
Verify that the correct cabling is used for your application. Refer to Chapter 2 for modem
installation instructions.
Verify that one modem is configured for Answer mode and the other is configured for
Originate mode.
Table B-4
(1 of 3)
Modem – VF Connection
Attach the telephone directly to the wall outlet to verify that a dial tone exists.
Make sure the VF line is connected to the modem's rear jack labeled LINE.
Verify that the Auto-Answer Ring Count configuration option (S-register 0) is set to a value
other than 0 (disable).
Verify that the DTE is providing DTR to the modem.
If the DTE does not provide DTR to the modem, verify that the modem's &D command
(DTR Action configuration option) is set for Ignore (&D0).
Verify that all cables are attached to the correct connectors on the rear of the modem.
Perform a Local Analog Loopback test and verify that data entered at the DTE is echoed
back to the DTE.
Verify that the originating modem is compatible.
Verify that originating modem recognizes your modem's answer tone.
November 1996
Action
Action
Action
3825-A2-GB30-20