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FEA TU RE 5705 -
AUTO-CALL FEATURE
OPERATIONAL
CHARACTERISTICS
Auto-Call Command
(ACC)
Digit Transfer
Reports
Malfunction (MR)
Error (ER)
END and Error
(EER)
70/720 Asynchronous
Data Set Buffer
•
This feature, together with an AT&T SOlA or SOlC Automatic Calling
Unit (or equivalent) enables one buffer to dial automatically and connect a
communication line under control of the processor andCCMo The Automatic
Calling Unit (ACU) and this special feature can only be used with a data set
which operates on the message network, or with TWX.
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 bu.ffer 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 o Thereafter, when DSS or DSR comes on, this feature
turns CRQ off and notifies the buffer to respond to a SEL with ENDo
When employed with the 70/720-22 buffer, END is delayed after DSR
comes on.
•
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 successive
SELs
o
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. When
PND comes on, this feature causes the buffer to become RDY as before.
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 offo 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 ono
Thereafter, the DLO lead is not monitored by this feature. The buffer
immediately reports the Error to the CCM and turns CRQ off.
• When an ACC is present, this feature notifies the buffer whenever the
ACR lead from the ACU is on. The buffer generates an END and Error
Report to the CCM and turns CRQ off.
4;...22
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