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If set-up for continuous lookback, a lookback will occur only after
a backup initiated after loss of carrier. During the dial backup the
modem will monitor the leased line continuous, and if this line is
"back" (transparent to tone signalling), the modem will start a
new handshake on leased line within about 2 seconds.
AT+&LB1 pial.
Continuous lookback
note that the criteria for dial backup should be loss of
carrier.
AT+&DA1¢%]
If set-up for interval lookback only, a lookback will be initiated at
fixed intervals depending on the value of +S32. This is
independent of the event leading to the backup.
| AT+&LB2¢%=|
Interval lookback.
A continuous lookback will start if loss of carrier initiated the
backup. An interval lookback will start if inactivity initiated the
backup
+ &LB3p%s|
Both interval and continuous
If the modem fails to connect at the leased line it will use Call-list
2 and try re-establishing a new switched line connection. If this
also fails, it will continuous try to connect at the leased line.
11-10
LZTR104006 R1.00
Zal 14.4/14.4-7 and 19.2/19.2-7
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