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Options
Automatic Calling
Unit Options
FEATURE 5714 -
FULL-DUPLEX
OPERATION
COMMANDS AND
DATA TRANSFER
REPORTS
OPTIONS
70/720 Asynchronous
Data Set Buffer
•
The AT&T 801 Automatic Calling Unit must be conditioned by the
common-carrier at installation with the indicated options described in the
appropriate Bell System Technical Reference. The ACU options used with
this buffer are:
Option Y - ACR timer stops in DATA mode.
Option
Z -
C all termination via data set.
•
This feature enables a pair of buffers (Model 70/720-21, only) to be used
for full-duplex operation on leased lines with any of the following data sets
(or equivalents): AT&T 103F and 202D .. One of the buffers is always the
transmitter and the other is always the receiver. This feature precludes
the Auto-Call feature and the buffer option.
It
can be installed in the factory
or in the field.
•
This special feature does not affect the buffer command and data transfer
functions. However, the program must route the proper commands to the
associated pair of buffers.
• The report functions of the individual buffers apply when this feature
is implemented, except that there will be no ring reportso
•
None .. However, the communications facilities and data sets must be
conditioned for full-duplex operation.
4-23
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