Transmission bridge
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5-4-280
In telephony, a device primarily intended to permit the through transmission of audio frequency currents whilst preventing the through transmission of d.c. signals.
Note: The bridge may have other functions such as the control of the holding, supervision and release of a connection. It may also feed microphone current to the telephone instrument.
Reference: I.E.C.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)