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COMSPHERE 3900 Series Modems
B-2 September 1998 3910-A2-GN32-40
Table B-2
Leased-Line Operation
Symptom
Action
The modems do not train-up on
leased lines.
Verify that the correct cabling is used for your application. Refer to
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,
but the modems cannot connect.
Verify that the correct telephone number for the remote modem is
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
back to leased-line operation.
Verify that the Auto Dial Standby configuration option is enabled. Refer
to Leased Line in Chapter 5, DCP Configuration.