Digicom 3911, 3910 Table B-2, Leased-Line Operation, Table B-3, Dial Backup Operation

COMSPHERE 3900 Series Modems

	Table B-2
	Leased-Line Operation
Symptom	Action
The modems do not train-up on	Verify that the correct cabling is used for your application. Refer to
leased lines.	Chapter 2, Modem Installation.
	Verify that one modem is configured for Answer mode and the other is
	configured for Originate mode. (For TMp operation one modem must
	be configured as a control modem and the other as a tributary
	modem.)
	Verify that both modems are using the same modulation scheme.
	Verify that both 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.

	Table B-3
	Dial Backup Operation
Symptom	Action
The dial backup line is present,	Verify that the correct telephone number for the remote modem is
but the modems cannot connect.	stored in directory location 1.
	Verify that both modems have the Auto Dial Backup configuration
	option set to Enable. Refer to Leased Line in Chapter 5, DCP
	Configuration.
	Call the answering modem with a handset and verify that the modem’s
	answer tone is transmitted.
The modem does not switch	Verify that the Auto Dial Standby configuration option is enabled. Refer
back to leased-line operation.	to Leased Line in Chapter 5, DCP Configuration.

B-2 September 1998 3910-A2-GN32-40