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Note.
When 2 or 3 exchanges are connected by tie-lines, Data
Transmitting and Receiving Units can be operated from
the stations which share the same exchange but their
operation is impossible from the stations which are con-
nected to the other exchange.
Equipments
to be controlled
Control of Data Transmitting and Receiving Units of each
exchange is only possible from the stations sharing the same
exchange and within the same areas circled in dotted lines.
Indication
panel
Data transmitting/
receiving unit
Data transmitting/
receiving unit
Exchange C
Exchange B
Exchange A
Data transmitting/
receiving unit
Indication
panel
Tie-line
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