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7.5.4
Operation of the modems:
(Synchronous DTE's are connected)
After the last configuration command, the modems will start
trying to connect on the leased line.
When the remote modem is detected, the handshake, auto login
and synchronous encryption procedure will be executed.
The modems turn CT109 and CT106 on.
At this time the DTE''s have a transparent synchronous channel.
The modems will stay in this mode as long as the leased line is
good.
If the leased line connection is lost, both modems will turn
CT 109 and CT 106 off and enter handshake mode trying
to reconnect the leased line.
If the leased line stays down, the originating modem will
detect a time-out and dial the remote modem on the
switched line.
The answering modem will detect the ring signal and
connect on switched line.
The complete login sequence is executed and the synchronous
encrypted channel is re-established.
While staying on the dialbackup line the originating modem will
continuously check the leased line.
When the leased line failure is corrected the modems will
immediately go back to leased line and set up a synchronous
encrypted channel.
7-1 8
LZTR104006 R1.00
Zat 14.4/14.4-7 and 19.2/19.2-7
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