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AT Commands
In manual mode, the return to leased line is only done when
commanded. In automatic mode the return to leased line is initiated after
the lookback time in register S28 has elapsed. To prevent unnecessary
termination of the dial line connection, a leased line lookback test is
performed. If the leased line is not acceptable, the dial connection is
resumed with a retrain. If the leased line is acceptable, the dial connec-
tion is dropped and normal leased line mode is resumed.
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 LOOK-
BACK for slightly more than a minute. During this time the dial line
connection is maintained if a return to dial line operation is required.
When the LCD displays ON LINE again the dial line is disconnected.
Note
A diagnostic test initiated during dial backup mode termi-
nates when the modem performs a leased line lookback.
Dial / Leased Line &L
&L selects line operation as required:
Command
&L
&L1
&L2
* default
5-36
Dial (switched) *
Leased (private) 2-wire
Leased (private) 4-wire
Operation
V.3400
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