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SYSTEM CONSIDERATIONS
The Message Switching Center
When operating as a message switching center, the configuration of the overall system must
be considered:
1.
Number and type of incoming/outgoing lines -- half duplex, full duplex, etc.
2.
Number of receive-only remote terminals
3.
Number of stations per multipoint line
4.
The speed of transmission on each line, if there are transmission speed differences
in the system.
5.
The handling of priority messages, if any
6.
Whether or not another DATANET-30 is included in the system
7.
Routing codes: multiple broadcast or single address
8.
Remote station identification codes
9.
Message format
10.
How communication with other networks will be handled
11.
Control of the system for beginning of day and end of day
12.
The type of remote terminal equipment and all operating characteristics.
The above list only partially covers the considerations necessary. After the characteristics
of each system have been determined, the programming can proceed.
Integrated Data Processing
The inclusion of a computer in the overall system permits various methods of handling incoming/
outgoing messages.
In one case, incoming data intended for the computer is transferred directly. In another, the
incoming data is stored first in a disc storage unit and retrieved by the computer.
A system may also store data in the disc storage unit and transfer
it
to the computer at a certain
time of day for batch processing.
Individual operating procedures and program requirements
will necessarily be developed for each system.
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V-60
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