PBX

abbr. private branch exchange (private telephone switchboard).

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\\|pē(ˌ)bē|eks\ noun (-s)

Etymology: private branch exchange

: a private telephone switchboard

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a manually or automatically operated telephone facility that handles communications within an office, office building, or organization and that is connected to the public telephone network. Cf. PABX

[P(rivate) B(ranch) Ex(change)]

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PBX (telecommunications)

abbrev

Private branch exchange, a private telephone switching apparatus which routes calls between extensions and the public telephone network, and internally between extensions

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PBX (no periods),

private branch (telephone) exchange.

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abbr. private branch exchange, a private telephone switchboard