(Note that when configuring a directory location of a rackmounted modem,
there is no prompt message asking for a configuration number.)
On answering a call from the master modem, the answering modem looks
at the directory location held in S-register S43. If the
<Ctrl-F>
character
is present, the associated configuration is loaded. The directory location
held in S43 can be altered to any of the possible locations 0-20 (the default
for S43 is directory location 10).
When transmission is restored to the leased line, both modems will revert
to their original configuration.
For your convenience three V.32bis backup configurations have been pre-
stored in user configuration locations 0, 1 and 2. These were described in
Section 4.2.
6.4.2 Automatic Dial Backup with Autorestoral
When configured for automatic dial backup with autorestoral, each modem
monitors the leased line. If the master modem detects a loss of carrier for a
period greater than that stored in S10, then it initiates a dial backup.
When the dial backup calls have been established and data is routed via
the PSTN, the leased line is monitored for recovery by a series of special
tones. On detecting that the leased line has recovered and is working in
both directions (for a period greater than that stored in S57 if you are using
2-wire, the period of time being fixed at 20 seconds on a 4-wire leased line
circuit), the master modem will signal the slave modem to drop the PSTN
call and return to leased line operation.
6.4.3 Manual Dial Backup Via the Front Panel
If manual dial backup is enabled (
*L1
being set), pressing the front panel
DB
button on the master modem will initiate a dial backup. To return to
leased line operation, release the
DB
button on the master modem.
6.4.4 Manual Dial Backup Via Software Command
If manual dial backup is enabled (
*L1
being set), issuing the command
''B
will force the modem into dial backup mode, regardless of the state of the
leased line. To return to leased line operation, issue the command
''L
.
X450-310851 Issue 2
6-9
Rev.0
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