Digicom 3910, 3911 Dial Standby/Return to Dial, Call Setup Dial Standby, Call Setup ReturntoDial

Call Setup Branch

Dial Standby/Return to Dial

When the modem is operating in Dial Backup mode (DialBckUp), Dial Standby and Return to Dial allow the modem to switch back and forth between primary leased-line and primary leased-line backup operation while still maintaining the backup connection (Figure 10-1). Switching between backup and primary leased-line operation can be performed manually or automatically. (Refer to Leased Line in Chapter 5, DCP Configuration, to enable the Automatic Dial Backup configuration option.)

	DIAL BACKUP LINE
	DIAL		RETURN
	STANDBY		TO DIAL
MODEM	X	X	MODEM
	LEASED-LINE
	FAILURE		496-13081-01

Figure 10-1. Dial Backup

Under normal backup conditions, when a problem occurs on the primary leased line, the modems establish a connection over the backup network.

Call Setup:

Dial Standby

F1 F2 F3

When this occurs, Dial Standby appears on the LCD in the Call Setup menu branch. If you select Dial Standby, the modem switches back to the primary leased line while still maintaining the backup connection. As a result, Return_to_Dial appears on the LCD instead of Dial Standby.

Call Setup:

Return_to_Dial

F1 F2 F3

If the primary leased line is unacceptable, select Return_to_Dial which switches the modem back to backup network operation (LCD displays Dial Standby). If, however, the primary leased line is operating properly, select Disconnect from the Call Setup branch to drop the dial backup connection. Also, if the primary leased-line operation is maintained uninterrupted for the amount of time specified in the Dial Standby configuration option, the dial backup network disconnects.

3910-A2-GN32-40 September 1998 10-5