Specifications

<C#>-18 V.3229 / V.3229L
<Re
f
erence>
Operation
¥Automatic - backup due to extended loss of carrier
or 4 unsuccessful retrains in 3 minutes
¥Manual - user determined using front panel controls
or AT commands
Note: In 4-wire leased line operation, if both units
have autodial backup enabled, one must be config-
ured for forced answer. This prevents both units from
dialing if the leased line fails.
Both methods use the prestored autodial number. If
the dial attempt is unsuccessful after three tries, a
retrain on the leased line will be initiated.
In automatic and manual mode the return to leased
line is initiated after the lookback time in register S28
has elapsed. In automatic mode unnecessary termi-
nation of the dial line connection is prevented by a
leased line lookback test. If the leased line is not
acceptable, the dial connection is resumed with a
retrain. If the leased line is acceptable, the dial
connection is dropped and normal leased line mode
is resumed. If return to lease line is manually invoked
in manual dial backup mode the dial line is dropped
immediately.
When the unit attempts to return to leased line, the
LCD displays LEASE LOOKBACK. If the leased
line has been restored to service, data can be passed
approximately 10 seconds after LEASE LOOK-
BACK was initiated. The LCD will continue to
display LEASE LOOKBACK for slightly more than
a minute. When the LCD displays ON LINE again
the dial line is disconnected.
Note: A diagnostic test initiated during dial backup