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 Telecommunications Object Thesaurus Term

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private automatic branch exchange

private automatic branch exchanges

Initial Reference:
BT Museum - List of Simple Names (1985)

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Scope notes:
Machine or electronic based system for use in a customer's premises, allowing a number of network exchange lines to be used across a number of in-house extensions. Originally, an operator would handle incoming calls on all but the smallest such system but later 'Direct Dialling In' systems changed this. Calls between the extensions were generally connected without involving the in-house switchboard operators.


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