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Dialing Adapter Unit Module (DAU 930)
The Dialing Adapter Unit module may contain from one to ten Dialing Adapter Channels, DAC 930.
The module is mounted in one of the spaces provided for buffer modules that interface with the
buffer selector.
Each DAC is an independent unit operating through the buffer selector and is
associated with one transmit/receive buffer, such as a bit buffer, or character buffer, etc. Two
buffer selector addresses are required, one for the DAC and one for the associated buffer.
DIALING ADAPTER CHANNEL (DAC 930).
The
General
Electric Dialing Adapter Channel
(DAC 930) provides the means for dialing telephone numbers of remote locations to transmit or
receive data.
The DAC 930, with its associated telephone equipment, enables the DATANET-30
to dial virtually any telephone number connected with the Bell System.
The associated telephone equipment consists of an Automatic Calling Unit (ACU) and a Data Set.
The DAC 930 is used only to place the telephone call. The ACU actually dials the number and
makes the connection.
The transmission or reception of data takes place through the associated Data Set and buffer on
the buffer selector. Only one transmission line is associated with each DAC, ACU, and Data Set.
If
it is desired to dial out on more than one line, a separate DAC, ACU, and Data Set are used for
each line (or call). Incoming calls are handled by the Data Set.
The DAC provides one four-bit digit buffer. One four-bit binary-coded decimal digit (O
10
-9
10 )
at a time is presented to the DAC by the DATANET-30 program. This digit occupies the four
least-significant positions of a DATANET-30 word.
The DAC then presents this digit to the
telephone company ACU for dialing.
Configurations
A DAU may be set up in the configurations shown in Figures 19 and 20.
Controls and Indicators
There are no controls or indicators in the usual sense except for the MANUAL CLEAR button on
the DATANET-30 control panel. All other controls and indicators are by program only.
Buffer Operations
The Dialing Adapter Channel and the Automatic Calling Unit may be used with several different
digital subsets and transmit/receive buffers.
The buffers in turn can connect to a variety of
terminal equipment.
The DEF and NES instructions for the transmit/receive buffers vary in
accordance with the buffer used, the digital subset used, and the terminal equipment.
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