PLESSEY PABX No. 4 EQUIPMENT RACKSPLESSEY PABX No. 4 EQUIPMENT RACKS |
2nd Group Selector and Machine Ringing Rack |
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| Exchange line Rack |  |
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Extension Line rack | |
The line rack accommodates 100 extension line circuits, 20 line-finders and 20 final selectors. The group selector rack houses up to 60 selectors (1st, 2nd ).
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