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41. Leased line.
11.2
Dial backup
When the modem is set to operate in leased line mode you normally
expect to have the modem connection established all the time. It may
however occur that these lines go down and the modems lose the
carrier. It may also happen that the connected DTE malfunctions and
as a resuit of this the data stream stops (data inactivity). The modem
can be set up to be aware of such situations and to automatically call
a modem connection on a switched line. This is possible because the
modem has separate line terminals for switched and leased line
connections.
A spare connection can be established manually or automatically:
a
= | Use manual dial backup
: Use automatic dial backup.
11.2.1.
Manual Dial backup. (+J0)
Use "Manual Dial backup" if an error has occurred on the leased
connection. It is necessary to disconnect the leased connection
before establishing a switched connection to another modem.
You may do this by entering AT-commands to the modem, or
use the front control facilities.
AT-command:
(Connection established)
= Enter escape code to the modem and wait for resultcode OK.
= Enter the forowing commands.
:
:--[ Disconnect the leased line connection
| Enter switched line mode.
xa
The modem dials number n.
LZTR104006 R1.00
11-3
Zat 14.4/14.4-7 and 19.2/19.2-7
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