ATIS Telecom Glossary
Tuesday, September 16, 2014

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four-wire circuit
A two-way circuit using two paths so arranged that the respective signals are transmitted in one direction only by one path and in the other direction by the other path. Note: The four-wire circuit gets its name from the fact that, historically, two conductors were used in each of two directions for full-duplex operation. The name may still be applied, e.g., to a communications link supported by optical fibers, even though only one fiber is required for transmission in each direction.

 

 

 

 

 

 

 

 

 

 



 
These definitions were prepared by ATIS Committee PRQC
 
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