CXR V.34bis series, Руководство по эксплуатации и установке

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Leased Line Operation
V.34bis Series Standalone & Rackmount Modems
79
For both of the above S77 settings the S78 setting is
not relevant.
77 = This is the hour clock setting for the test of the dial
back up link with 24 considered as midnight.
f the dial back
The dial back up link test will establish a link with both carriers detected and
on
terval of 500 milli-seconds. For this indication the dip switch settings must
d S2-4 in the ON position.
Additional Dial Back-Up Lookback Features
Using S-Registers 77 and 78, two additional features can be invoked for the
dial back up operations. The first is to have the modem make the dial back
up call and maintain the dial connection for five minutes before attempting
the lookback action. The second is to have the modem test the dial back
up link once every twenty-four hours. These features are controlled by the
S77 and S78 registers as follows:
S77 = 0
Disables these features
S77 = 25 Enables the five minute hold on the dial connection
before attempting a lookback.
1 through 24 S
S78 = 0 through 59 This is the minute setting for the test o
up link.
then will hang-up and return to lease line operation. If this test is successful
pin 25 of the EIA connector will toggle from OFF to ON then OFF with an
in
include S2-3 in the OFF position an