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12–3
Auto-handshake
If you want handshaking to occur automatically upon power-up, you have to save
the leased-line configuration to the power-on profile. How to designate a profile to
be a power-on profile is described in chapter 7. Please remember to set the hand-
shake mode before you save the configuration. Be sure that one modem is set to
originate mode and the other to answer mode.
Leased-Line Dial Backup
When a leased-line connection fails, some actions may be taken by the modem.
1) Reattempt to connect on the leased line indefinitely if the dial backup option is
disabled.
2) 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 on the leased line and monitor the dial-up line for rings.
Incoming dial-backup calls will be answered.
Dial Backup
Only the 2864L and the rack mount model have the dial backup function and ca-
pability. They have separate dial-up and leased-line phone jacks/connectors. The
dial backup option can be set by issuing an asynchronous AT command from the
terminal, or by using the front panel control.
The originating modem will try to dial the number up to nine times or until a
3-minute timeout is activated. If the dial backup attempt fails, the originating mo-
dem will go back to try the leased line connection. If this fails, it will try the dial-up
line again.
+ ORIGINATE AT*M0 When operating over a leased line, modem
will handshake in originate mode. (Default)
ANSWER AT*M1 When operating over a leased line, modem
will handshake in answer mode.
+ DISABLED AT*B0 Leased-line dial backup disabled (Default).
PH0-PH49 AT*B1-50 When 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 moni-
tor the dial-up line for rings.