Motorola and V.32bis, V.34-SDC, 326X V.34 manual Call Termina Tion

326X Series Modem Troubleshooting Guide (Continued)

Problem	Diagnosis/Test	Possible Solution
CALL TERMINA-
TION
Modem takes too long to	Check to see if remote modem	If remote modem doesn’t support PSTN cleardown, try to
disconnect	supports PSTN cleardown.	change the setting of DCD Loss Disconnect (AT*CD)
		to a smaller number.
Modem doesn’t discon-	Check modem’s DTR option for	• Set DTR to an option other than High.
nect when DTR drops,	correct setting.	• Set DTR=Discon (AT&D2).
or
Modem doesn’t discon-
nect when communica-
tions software package
does
Communications soft-	Check the delay between issuing	Ensure the escape sequence (+++) complies with the
ware package won’t sig-	the escape sequence (+++) and	modem’s guard time requirements (refer to Line feed
nal the modem to return	the ATH command.	character:S-Register 4 for details).
to command state when
escape sequence (+++)
is issued
	Check whether the modem is set	Set ACU Select=AT (ACU OPT's menu).
	for AT ACU.
FILE TRANSFER
Can’t transfer all of a	Check the modem’s flow control	Ensure that the DTE's flow control is the same as the
file or a file aborts in	settings.	modem’s setting (for example XON-XOFF, RTS/CTS).
the middle of transfer
	Check whether your	If your communications software supports speed conver-
	communications package	sion, set modem’s Speed Conver=On (AT*SC1).
	supports speed conversion.
It takes longer than	Confirm which file transfer	Use different protocol, for example, YMODEM,
expected to transfer a	protocol you are using.	Y-GMODEM.
file

If operating the 326X-SDC modem in SDC mode, and you experience this type of problem...

BER tests do not work	BER tests do not work in SDC
	mode because data is not framed.
Modem won’t pass data	Ensure your DTE protocol is	If your protocol is not HDLC/SDLC-like, use direct
	HDLC/SDLC-like data.	mode.
	Check for data format mismatch	Set data format option to match the DTE [NRZ
	between modem and DTE	(AT*DF0) or NRZI (AT*DF1)].
	(AT*DF).
	Check clocking requirements.	Set modem for internal or external clock as required by
		your application.

Troubleshooting

Troubleshooting Guide 6-7