Aborting From Leased-Line Operation; Terminating A Leased Line Connection - ZyXEL Communications U-336S User Manual

fails, the originating modem will go back to try the leased line
connection. If this fails, it will try the dial-up line again.
It will try these two alternatives indefinitely. If the dial backup
attempt succeeds, the value of S-register S34 determines the
interval of the dial backup connection before going back to check
the leased line.
AT-Command Description
ATS34=0
ATS34=n;
(1≤ n ≤ 255;
default:30)

Aborting from Leased-Line Operation

If the leased line has not been connected, pressing any key on the
front panel will abort the attempt to connect to the leased line. If
dial backup is enabled, backup action will be taken. Pressing any
key again will abort the backup action and revert to the IDLE
SCREEN display.

Terminating a Leased Line Connection

Disconnecting the leased line manually will force your modem to
switch to the IDLE SCREEN. Either going on-line manually or, if
you have set the leased line as the power-on default, turning the
power OFF and ON, will make the modem try the leased line again.
46 Leased Line Operation
The dial backup line continues to be used
indefinitely.
Retries leased line after n minutes. If the leased
line has still not been recovered, the modem will
continue to use the dial backup line.