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In a hundred-line exchange 24 two-motion selectors are used. Draw the schematic you suggest for this exchange and explain its working. How many simultaneous calls can be made during peak hour in this exchange?
The needed schematic for 100 lines exchange along with 24 two motion selectors is demonstrated in figure.
FIG - 100 Lines- Exchange
In this case, 24 simultaneous calls can be place through the switch. Classically, a 24- outlet uniselector is utilized as a selector hunter. All of the 24 outlets are connected to one two-motion selector. Therefore, a subscriber has access to all the 24 two-motion selectors into the system. The equivalent outlets of all the selector hunters are commoned and therefore, all subscribers have access to each of two-motion selectors. Such scheme is demonstrated in figure. The call establishment in such scheme complete in two steps. Firstly, while the subscriber lifts his receiver handset, his uniselector hunts by the contact positions and seizes a free two-motion selector. And next, the two-motion selector responds to the dial pulses for suitable connection.
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