Paradyne 3800 Table C-4, Online Operation, Table C-5, Leased-Line Operation, Table C-6, Symptom

COMSPHERE 3800 Series Modems

	Table C-4
	Online Operation
Symptom	Action
Data scrambled	Verify that the character format (data bits, parity, and stop bits) is set to the same value in both
	modems.
Missing data during a	Verify that you are using the same method of flow control for both the modem and the DTE.
transfer	If using XON/XOFF flow control, verify that the modem’s parity matches the DTE’s parity.

	Table C-5
	Leased-Line Operation
Symptom	Action
Modems do not train-up	Verify that the correct cabling is used for your application.
on leased lines	Verify that one modem is configured for Answer mode and the other is configured for Originate
	mode.
	Verify that both modems are using the same modulation scheme.
	Verify that modems are configured for the appropriate leased-line mode. For example, if you
	have a 4-wire leased line, then the modems must be configured for 4-wire operation.
Modems are configured	Verify that both modems have the Auto Dial Backup configuration option enabled.
for dial backup, but do
not switch to dial lines if
leased lines fail

	Table C-6
	Dial Backup Operation
Symptom	Action
Dial backup line is	Verify that the correct telephone number for the remote modem is stored in directory
present, but cannot	location 1.
connect	Verify that one modem has the Auto Dial Backup configuration option set for Disable and the
	other has it set to Enable.
Modem does not switch	Verify that the Auto Dial Standby configuration option is enabled.
back to leased-line
operation

C-4 September 1998 3810-A2-GB30-30