Paradyne COMSPHERE 3920PLUS Series, Technical Reference Manual

Page: 274 / 356

Troubleshooting
B-5 3920-A2-GH30-40 October 1998
Table B-5
(2 of 2)
Modem — VF Connection
Symptom Action
Intermittent disconnects, high error
rates, or excessive retransmissions
occur. Perform an End-to-End test. Refer to Pattern located in Chapter 8, Test Branch.
The modem establishes and then
disconnects the call. You may have a poor VF connection. Try dialing again.
The remote modem may have encountered an error control (EC) disconnect. If
the modems cannot negotiate EC, then a disconnect occurs.
The remote modem may be in a forced Error Control mode (disconnect if there
is no error control). Reconfigure your modem to V.42/MNP or Buffer and try
again.
Check the LCD to determine the reason for the disconnect.
Perform a Local Analog Loopback test.
High error rates occur when running
a local loopback or self-test. Incoming rings can cause data errors during a loopback test. Abort the test,
disconnect the modular VF cord, and restart the test.
Table B-6
Online Operation
Symptom Action
The data is scrambled. Verify that the character format (data bits, parity, and stop bits) is set to the
same value in both modems.
Data is missing during a transfer. 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-7
Misc Operation
Symptom Action
Problems in collecting Health and
Status information from tributary
modems. When a multipoint network contains tributary modems using different firmware
releases, you could encounter problems in the collection of Health and Status
information. If the above situation applies to your network, set the Mixed Trib
F/W configuration option to Yes.