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Automatic Calling Unit (ACU)
The Telephone Company Data Auxiliary Set 801A for automatic calling is not covered in great
detail.
Anyone interested in more information than contained here may obtain a copy of the
Data Auxiliary Set 801A-Interface Specification (March 1964) from:
Data and Teletypewriter Planning Engineer
American Telephone and Telegraph Company
195 Broadway
New York, New York 10007
The operating features of the ACU pertinent to the operation of the DAC are:
1.
The ACU obtains the dial tone in response to a Call Request from the DAC.
2.
The ACU dials the digit received from the DAC.
3.
When the last digit has been dialed, the ACU waits for the called location to answer.
4.
The ACU detects the answer signal.
5.
The ACU then transfers control of the call (telephone line) to the Data Set connected to
the ACU and the transmit/receive buffer.
6.
If
the call cannot be successfully completed, the Abandon Call and Retry timer of the
ACU notifies the program.
INTERCONNECTING COMPUTER BUFFERS
Processor Interrupt Unit (PIU 930)
The DATANET-30 Processor Interrupt Unit (PIU 930) allows transfer of data from the memory
of one DATANET-30 to the memory of another.
One processor interrupt unit (PIU) for each
DATANET-30 is required. Each PIU occupies one option module space and is assigned an address
on the buffer selector. The address is specified by the address plug for the PIU.
DATANET-30
Buffer
Selector
Memory
Interrupt
Interface
PIU
~00
feet
(Maximum)
PIU
Figure 21. PIU Connecting Two DATANET-30's
DATANET-30
Buffer
Selector
Memory
Interrupt
Interface
IDJ&1i~~~1ic::J ~®------------
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