In
telecommunication
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that ...
, a cord circuit is a
switchboard circuit in which a plug-terminated cord is used to establish connections manually between
user lines or between trunks and user lines. A number of cord circuits are furnished as part of the switchboard position equipment. The cords may be referred to as front cord and rear cord or trunk cord and station cord. In modern cordless switchboards, the cord-circuit function is switch operated and may be
programmable.
In early and middle 20th century
telephone exchange
telephone exchange, telephone switch, or central office is a telecommunications system used in the public switched telephone network (PSTN) or in large enterprises. It interconnects telephone subscriber lines or virtual circuits of digital syst ...
s this task was done by a supervisory relay set known variously as
junctor circuit or
district junctor. Later designs made it a function of the trunk circuit or absorbed it into software.
See also
*
Switched loop
References
*
Telephony equipment
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