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Buffer Selector
The buffer selector is an important functional element of the DATANET-30. Low speed information
flow between the communications processor and external equipment is through buffers connected
to the buffer selector.
All units directly connected to the buffer selector will be referred to as
"buffers." The buffer selector contains one hundred twenty eight (128) channels numbered 0 to 127.
Channel Address
Each buffer occupies one channel address of the buffer selector whether it is for a simplex, half
duplex, full duplex, or any other type of transmission facility. The desired buffer selector
address of a channel is easily established by wiring a channel address plug. The address can be
changed or new addresses (buffers) added by changing the plug wiring or inserting a different
plug.
The channel addresses in any given group of buffers need not be sequential. Channel 0 is
always reserved for the paper tape reader.
DATANET-30 BUFFER MODULES
The DATANET-30 has physical space for 12 buffer modules. The buffer modules vary according
to size of buffer storage and purpose.
Depending upon the system, the twelve modules will
contain the desired configuration of:
A.
Communication Line Buffers
Bit Buffer Unit (BBU) Module
Character/Word Unit (CWU} Module
Dialing Adapter Unit (DAU) Module
Telpak A Buffer Module
B.
Interconnecting Computer Buffers
Computer Interface Unit (CIU) Modules .
Processor Interrupt Unit (PIU) Modules
C.
Peripheral Equipment Buffers
Controller Selector Unit (CSU) Modules
.
Common Peripheral Channel (CPC) Module$,
Removable Disc Unit (RDU) Module
Card Read Unit (CRU) Module
Punch Reader Unit (PRU) Modules
Other System Components
These components do not occupy space in the DATANET-30. They are connected externally to
peripheral equipment and communication lines.
1.
Parallel Channel Adapter
2.
Manual Peripheral Switch
3.
Programmed Peripheral Switch
4.
Voltage Current Adapters
5.
Digital Subsets
6.
Communication Lines
[ID/A\1J/A\~~11CJ ~@------------
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