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FEATURE 5705 -
AUTO-CALL
FEATURE
OPERATIONAL
CHARACTERISTICS
Auto-Call Command
(ACC)
Digit Transfer
Reports
Malfunction (MR)
Error (ER)
Automatic Calling
Un it Options
70/721 Synchronous
Data Set Buffer
•
This feature together with an AT&T 80lA or 80lC Automatic Calling
Unit (or equivalent) enables one buffer to dial automatically and connect a
communication line under control of the processor and CCMo The Automatic
Calling Unit (ACU) and this special feature can only be used with a data set
which operates on the message network.
This special feature can be installed in the factory or in the fieldo
•
This command is used only for a buffer equipped with the Auto-Call
feature. The function of an ACC is to condition the buffer and feature, as
well as the Automatic Calling Unit, for transfer of dialing digits.
When the buffer decodes an Auto-Call Command (ACC), it so notifies
this feature which turns CRQ ono Upon termination (TERC) of the ACC, this
feature is notified. Thereafter, when DSS comes on, this feature turns CRQ
off and notifies the buffer to respond to a SEL with ENDo
•
The buffer executes an ACC as indicated. When PND is received from
the ACU, this feature causes the buffer to respond with RDY on four suc-
cessive SELs. When the four bits which represents the digit to be dialed
are received from the CCM, they are made available to the ACU on the
digit Leads by turning DPR on. DPR remains on until the ACU drops PND o
When PND comes on, this feature causes the buffer to become RDY as
beforeo This process continues until TERC along with the last bit of the
last digit to be dialed is received from the CCM. Thereafter, this feature
causes the buffer to terminate as indicated in the previous section.
•
Upon notification that an ACC is present in the buffer, this feature
notifies the buffer whenever PWI goes ofL The buffer, in turn, immediately
issues an MR to the CCMo
•
Upon notification that an ACC is present in the buffer, this feature
notifies the buffer, during the next CCM SEL if the ACU DLO lead is one
Thereafter, the DLO lead is not monitored by this feature. This feature
also notifies the buffer whenever the ACU ACR lead is one When the ACR
lead is on, the buffer reports END and ERROR to the CCM, and turns CRQ
off.
• The AT&T 80lA Automatic Calling Unit must be conditioned by the
common-carrier at installation with the indicated options described in
Bell Technical Reference: Data Auxiliary Set 80lA (Automatic Calling
Unit) Interface Specificationo
Y - ACR timer stops in DATA modeo
Z - Call termination via data seta
4-28
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