Telenetics V.32bis Series, V.34-SDC, 326X V.34 manual Data stops passing

Troubleshooting

326X Series Modem Troubleshooting Guide (Continued)

Problem	Diagnosis/Test	Possible Solution
Data is garbled or lost Check the modem’s flow control		•	Ensure that the DTE's flow control is the same as the
	settings.		modem setting
			(for example, XON-XOFF, RTS/CTS).
		•	If your communications package’s file transfer
			protocol is used, and the package supports RTS/CTS
			Flow control, set Flow=RTS/CTS (AT*FL3). If the
			package does not support RTS/CTS flow control, set
			Flow=Off (AT*FL0).
	Check that the modem’s DTE	If they do not match, adjust as necessary.
	rate, parity, and character length
	match the DTE’s settings.

If in normal mode, check line quality:

•Check CQMS parameters (signal quality and error probability).

	•	Run a remote digital	If no errors occur, the line is good.
		loopback (RDL) or RDL	If errors occur, perform a manual retrain, or retry the
		with pattern test.
			phone call.
	•	If you are still receiving	If the LAL or LAL with pattern test fails, contact Telenet-
		errors, disconnect the	ics Customer Support or your local distributor.
		modem from the line and	If the LAL or LAL with pattern test passes, you may have
		perform a local analog
			a line problem (contact your telephone company) or a
		loopback (LAL) or LAL
			problem with your application (check with your software
		with pattern test (with
			vendor).
		modem flow control off).
Data stops passing	Modem could be in “flow off”		• Set the modem for hardware flow control.
	condition (modem set for XON-		• Set Flow=Off (AT*FL0).
	XOFF and DTE set for hardware

flow control).

The modem connects at a lower rate than the maximum (as set in the Max Rate (AT*MX) option)

Check CQMS parameters for line quality.

Ensure that the remote modem supports the DCE rates you anticipate.

Line quality is not sufficient to support higher data rate. If line quality improves, the modem will increase its speed automatically.

Excessive modem	Retry call.	Continuous retrains indicate a line problem. Contact your
retrains		telephone company.

6-6 Troubleshooting Guide