Early
Exchanges ...connecting the UK |
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| EXIT to Switchroom |
Introduction |
Central Battery Exchange Types |
Enfield CB1 |
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| EXIT to Inland Switching | | |||||
Early Exchanges Staffing overview Early exchanges employed young boys to answer and connect the calls. However, young ladies had a better demeanour for this type of work and thus manual, and later auto-manual, exchanges were staffed predominantly by female employees. Night staff doing 'through nights' were mostly male and this division of the sexes continued until (approx.) the early 1980s when there was less discrimination in the workplace. Exchange Types As the Telephone Service expanded, the simpler types of signalling were superseded by more complex solutions which could serve a greater number of subscribers. In the days before automatic switching, these were the common types of manual exchanges: |
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Here's a summary of the key features of each
type:- Slipper Jack Exchange Single wire, earth return. Local battery in subscribers' premises. Drop indicators to show calling line. Patching jacks to connect calls. Two operators needed. Trembler bells for calling. No automatic 'clear-down'. Magneto Exchange Single wire, earth return. Local battery in subscribers' premises. Magneto indicators to show calling line. Multipled jack appearances. Magneto bells and hand generators for calling. Magneto signal to 'ring-off' or 'clear-down'. Central Battery (CB) Exchange Pair of wires used. Central battery in exchange. Use of signalling relays and Supervisory lamps to show calling line. Multipled jack appearances. Separation of cord circuits from speaking & ringing keys. Magneto bells for calling. 'Clear-down' signal given when handset replaced. Central Battery Signalling (CBS) Exchange For exchanges without a mains supply. Central battery in exchange for signalling. Local battery retained at subscribers' premises for transmitter current. Drop indicators used to show calling line. Magneto bells for calling. 'Clear-down' signals: CBS1 - earth on 'A-line. CBS2 - disconnection. CBSm Exchange A CBS exchange equipped with a subscribers' multiple suited to larger exchanges. Central Battery Types The majority of switchboards favoured the Central Battery design, the four main types being: |
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Enfield Manual Board CB1
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Light-Straw. Page last updated 10th
July 2015.
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