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 fe ...
, a cord circuit is a
switchboard circuit in which a plug-terminated cord is used to establish connections manually between
user
Ancient Egyptian roles
* User (ancient Egyptian official), an ancient Egyptian nomarch (governor) of the Eighth Dynasty
* Useramen, an ancient Egyptian vizier also called "User"
Other uses
* User (computing), a person (or software) using an ...
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
A 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
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, 1ESS switch and other switches.
In early electromechanical switches, a "district junctor" handle ...
or
district junctor
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, 1ESS switch and other switches.
In early electromechanical switches, a "district junctor" handle ...
. Later designs made it a function of the trunk circuit or absorbed it into software.
See also
*
Switched loop
In telephony, a Switched loop is a circuit that automatically releases a connection from an attendant console or switchboard, once the connection has been made to the appropriate terminal.
Loop buttons or jacks are used to answer incoming li ...
References
*
Telephony equipment
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