ZyXEL Communications U-336R/RE manual Leased-Line Dial Backup, Leased Line Operation

configuration. Be sure that one modem is set to originate mode and the other to answer mode.

AT-Command	Description
AT*M0	When operating over a leased line, modem will
	handshake in originate mode. (Default)
AT*M1	When operating over a leased line, modem will
	handshake in answer mode.

Leased-Line Dial Backup

When a leased-line connection fails, the following actions may be taken by the modem:

∙Reattempt to connect on the leased line indefinitely if the dial backup option is disabled.

∙If the dial backup is enabled, the originating modem attempts to dial a pre-stored telephone number to backup the connection; the answering modem will reattempt to connect to the leased line and monitor the dial-up line for rings. Incoming dial-backup calls will be answered.

Dial Backup

The dial backup option can be set by issuing an asynchronous AT command from the terminal, or by using the RS-1612 LCD control panel.

AT-Command	Description
AT*B0	Leased-line dial backup disabled (Default).
AT*B1-50	When the leased-line cannot continue operation,
	the originate mode modem will automatically
	dial the number stored in the memory address
	selected. The answer mode modem will monitor
	the dial-up line for rings.

Leased Line Operation 37