Paradyne 3910 Table B-5 Modem Ð VF Connection Symptom Action, Table B-6, Online Operation

Troubleshooting

Table B-5

(2 of 2)

Modem Ð VF Connection

Symptom

Action

The modem dials but does not	If the modem is operating behind a PBX, determine if a 9 and comma
connect.	are needed before the telephone number.
	Verify whether Tone or Pulse dialing is needed.
	Verify that both modems are configured the same in regard to Error
	Control. Try calling in Buffer mode.
	If both modems use V.32bis or V.32 modulation, try setting the
	modem's V.32bis Train configuration option to Long.
Intermittent disconnects, high	Perform an End-to-End test. Refer to Pattern located in the Test
error rates, or excessive	Branch section of Chapter 3.
retransmissions occur.
The modem establishes and	You may have a poor VF connection. Try dialing again.
then disconnects the call.	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	Incoming rings can cause data errors during a loopback test. Abort the
running a local loopback or	test, disconnect the modular VF cord, and restart the test.
self-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.

3910-A2-GN32-30 November 1996 B-5