Paradyne 392xPLUS operation manual Modem Ð VF Connection, Table B-5

COMSPHERE 392xPlus Modems

	Table B-5
	(1 of 2)
	Modem Ð VF Connection
Symptom	Action
The modem does not receive a dial	Attach a telephone directly to the telephone line to verify that a dial tone exists.
tone.	Make sure the VF line is connected to the modem's rear jack labeled DIAL.
The modem does not go off-hook	Verify that the Auto Answer Ring Count configuration option is set to a value
and answer an incoming call.	other than 0 (disable). Refer to Line Dialer in Chapter 4.
	Verify that the DTE is providing DTR to the modem.
	If the DTE does not provide DTR to the modem, verify that the modem's DTR
	Action configuration option is set for Ignore. Refer to DTE Interface in
	Chapter 4.
	Verify that all cables are attached to the correct connectors on the rear of the
	modem.
The modem goes off-hook, answers,	Perform a Local Analog Loopback test and verify that data entered at the DTE
but does not connect.	is echoed back to the DTE.
	Verify that the originating modem is compatible with your receiving modem.
	Verify that the originating modem recognizes your modem's answer tone.
	Verify that the originating modem supports your modem's modulation schemes.
	The 392xPlus modem recognizes CCITT V.34, V.32bis, V.32, V.22bis, V.22,
	V.21, Bell 212A, and Bell 103J. The 392xPlus modem does not support other
	vendors' proprietary modulation schemes.
	Force your modem to operate at the same modulation scheme as the
	originating modem to see if they connect.
The Originate Mode does not	Verify that the modem's DTE Dialer Type configuration option is set to the
function properly.	correct setting: either AT, DTR Dialing, V.25bis Async, V.25bis Bisync, or
	V.25bis HDLC. Refer to DTE Dialer in Chapter 4.
The modem does not go off-hook	If using AT Dialing, refer to Table B-4, Modem Ð DTE Connection.
and begin dialing.	If using DTR Dialing, verify the telephone number stored in directory location 1,
	and verify that the DTE is raising DTR from Off to ON to initiate a dial.
	If using V.25bis Async, verify that the correct character format is set to 7 data
	bits with even parity and 1 stop bit, and the carriage return and line feed are
	used as command terminators.
	If using V.25bis Bisync, verify that the correct character format uses two
	synchronous control characters and a start-of-text control character before the
	text block, and an end-of-text control character after the text block.
	If using V.25bis HDLC, verify that the character format uses flag, address, and
	control characters before the text block and a frame sequence check and flag
	after the text block.
The modem dials but does not	If the modem is operating behind a PBX, determine if a 9 and comma are
connect.	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.

B-4 November 1996 3920-A2-GN31-30