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telephone circuit

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.03 sec.
telephone circuit [′tel·ə‚fōn ‚sər·kət]
(electricity)
The complete circuit over which audio and signaling currents travel in a telephone system between the two telephone subscribers in communication with each other; the circuit usually consists of insulated conductors, as ground returns are now rarely used in telephony.


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Officials were unaware of the problem because of the failure of a telephone circuit used for remote monitoring at the Sanitation Districts' Central Alarm Center in Long Beach, according to the report.
Almost all 9-1-1 calls in the United States today are delivered on legacy CAMA trunks - a type of telephone circuit that enables the call-taker to receive both data and voice paths simultaneously, but that has been replaced in other industries by high speed digital circuits.
 
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