Toa EXES-6000, Operating And Troubleshooting

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2-3. Space Division and Time Division Methods
a. Space Division Method
Fig.5 Space Division Method (8 lines/2 links)
The method employed in Toa EX-16 system. With
this method, the system can do with the relatively
small number of switches if it is the small system.
But if the system consists of many stations, more
switches are required than with the time division
method referred to in the next section. Supposing
the EXES-6000 system (128 stations/16 links) was
designed with this method, it would require (2 x
128) x (16 x 2)
=
8192 switches in total.
b. Time Division Method
Fig.6 Time Division Method (8 lines/2 links)
The method adopted in the EXES-6000 system.
All stations are connected by one of each of
transmitting and receiving bus lines, we call
"highway", and the speech signals are multi-
plexed on the bus lines by means of pulses of
different timing. If we compare this method with
the space division method by taking the same
example of the EXES-6000 system (128 stations/
16 links), the required number of switches is 128
x 2 + 16 x 4 = 320 pieces (this is the actually
required number and not in agreement with a
calculation made from the above Figure. For
details refer to later explanations.), which is far
smaller than that required with the space division
method.
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