Paradyne COMSPHERE 3821Plus User Manual page 124

COMSPHERE 3821Plus Modem
Symptom
Intermittent disconnects,
high error rates, or
excessive retransmissions
Modem connects but sends
ERROR result code to DTE
Modem establishes and
disconnects a call disconnects a call
High error rates occur when
running a local loopback or
self-test.
Symptom
Modem cannot send or
receive a fax receive a fax
Sections of your fax are
missing
Your fax did not complete,
and your modem displays
result codes in the numeric
format
C-4
Table C-5
(2 of 2)
Modem – VF Connection
Use the AT&T7 command to perform a remote digital loopback test with pattern test.
Your modem may be configured to use security and you are not supplying the proper
passwords. See Chapter 7,
You may have a poor VF connection. Disconnect and dial again.
The remote modem may have encountered an EC Disconnect, where the modem is
configured to establish a call using error correction.
If the modems cannot negotiate EC, then a disconnect occurs.
The remote modem may be in a forced Error Control mode (causing it to disconnect if there
is no error control). Reconfigure your modem to V.42/MNP or Buffer and try again.
Perform a Local Analog Loopback test to check the modem's hardware operation.
Incoming rings can cause data errors during a loopback test. If possible, disconnect the VF
line, then abort and restart the test.
Table C-6
Fax Operation
Make sure that your fax software is correctly installed.
Check your fax software to see if there is an Answer mode or Receive Fax setting that must
be enabled.
This often indicates a noisy telephone line or a flow control problem. To resolve the flow
control problem, try using hardware flow control (RTS/CTS). This must be enabled in your
software (refer to the software's documentation) and set within your modem using the
AT&K3 command (RTS/CTS flow control).
For some reason your modem and software are no longer communicating, and, as a result,
your modem is stuck in fax mode. Type ATE1V1 and press Enter. The software should
respond with an OK. Try sending or receiving the fax again.
February 1998
Action
Security .
Action
3821-A2-GB20-30