Black Box 32144 Manual page 118

MODEM 32144
Enabling Dial Line Auto-Recovery
Dial Line Auto-Recovery will not be
active until you select DIAL from
the front panel AUTO-DIAL screen
(or, in Hayes mode, use the
command AT DS=0—or, in V.25 bis
mode, use the command CRS 0). If
power is removed from the
modem, you will have to re-enable
Dial Line Auto-Recovery. To disable
Dial Line Auto-Recovery, select
RESET from MAIN MENU screen
3.
4.8.2 R P
ECOVERY
If Dial Line Auto-Recovery is
enabled and the modem goes on-
hook, it will redial the stored
phone number up to 10 times. It
will redial 5 times at 30-second
intervals, wait 2 hours, and then
redial 5 additional times at 30-
second intervals. The modem stops
redialing after 10 attempts.
If a connection has been broken
and re-established and is then
broken again, the full sequence of
10 redial attempts will not occur
unless the modem has been on-line
for more than 1 hour. The modem
will redial, but it is programmed
not to exceed more than 10 redial
attempts in 1 hour.
84
ROCEDURE
4.9 Leased Line Auto-Recovery
The Leased Line Auto-Recovery
feature allows the modem to
automatically restore operation for
a leased line application by using
dial lines as a backup when
conditions on the leased lines
deteriorate. The modem uses
signal quality and loss of carrier
detect to determine if line
conditions are unsatisfactory.
Leased Line Auto-Recovery is
accessed via the AUTO-RECOVERY
screen on the front-panel LCD.
The following conditions are
required for Leased Line Auto-
Recovery operation:
• Leased Line Auto-Recovery
must be enabled (using the
Leased Line Auto-Recovery
Select option) on both
communicating modems.
• The Leased Line Auto-Recovery
Select, Return, and Test options
must be set correctly on both
communicating modems, as
explained in the following
sections.
• A dial backup line (or lines)
must be installed.
• The phone number to be dialed
(the backup line) must be
stored in the originate modem,
as explained in the previous
section.
• Auto-answer must be enabled
on the answer modem.