3-6 CHAPTER 3: TROUBLESHOOTING
On-line Operation
Data is scrambled
Check that the character format (data bits, parity, and stop bits) is set to the same value in both modems.
Missing data during a transfer
Check that you are using the same method of flow control for both the modem and the DTE.
If using XON/XOFF flow control, check that the modem’s parity matches the DTE’s parity.
Private-line Operation
Modems do not
Check that the correct cabling is used for your application.
Check that one modem is configured for answer mode and the other is configured for originate mode.
Check that both modems are using the same modulation scheme.
Dial Backup Operation
Modems do not establish a PSTN link when the Private line fails
Check that the communicating modems are configured to support dial backup, as described in the AccessBuilder 7000 AT Command Reference.
Check that one modem is configured to initiate the backup (i.e. is the master modem, and has the backup telephone number stored in its directory location 8) and the other modem is configured to be a slave (its directory location 8 is empty).
Check that both modems are using the same modulation scheme over their PSTN line.
