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COMSPHERE 3800 Series Modems
C-4 November 1996 3810-A2-GB30-20
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
transfer
Verify that you are using the same method of flow control for both the modem and the DTE.
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
on leased lines
Verify that the correct cabling is used for your application.
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
for dial backup, but do
not switch to dial lines if
leased lines fail
Verify that both modems have the Auto Dial Backup configuration option enabled.
Table C-6
Dial Backup Operation
Symptom
Action
Dial backup line is
present, but cannot
connect
Verify that the correct telephone number for the remote modem is stored in directory
location 1.
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
back to leased-line
operation
Verify that the Auto Dial Standby configuration option is enabled.