Junctor

junctor circuitdistrict junctorjunctors
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches.wikipedia
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Number One Crossbar Switching System

1XBNo. 1 Crossbar1XB switch
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches.
In addition to the Line Link Frame, the 1XB consisted of a series of additional crossbar frames and junctors that were used in call completion.

Number One Electronic Switching System

1ESS switch1ESS1AESS
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches.
Thus they required eight stages rather than four to achieve large enough junctor groups in a large office.

Number Five Crossbar Switching System

5XB switchNo. 5 Crossbar switch5XB
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches.
Each TLF is connected to all LLF by at least ten junctors

Cord circuit

junctors
In early electromechanical switches including panel switch, a "district junctor" handled supervision and talk battery duties for outgoing calls, similar to the duties of the cord circuit of manual exchanges.
In early and middle 20th century telephone exchanges this task was done by a supervisory relay set known variously as junctor circuit or district junctor.

Telephone exchange

exchangescentral officeexchange
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches.

Panel switch

Panelother exchange typespanel dial systems
A junctor is a circuit used in analog telephone exchanges, including the Number One Crossbar Switching System, Number Five Crossbar Switching System, Panel switch, 1ESS switch and other switches. In early electromechanical switches including panel switch, a "district junctor" handled supervision and talk battery duties for outgoing calls, similar to the duties of the cord circuit of manual exchanges.

Conference call

conference callingthree-way callingaudio conferencing
When three-way calling was introduced, three-port conference trunks were used, which only appeared on trunk nets.

Permanent signal

left off-hookpermanent loop
In most mid-20th-century switching equipment, a permanent signal would tie up a junctor circuit, diminishing the ability of the switch to handle outgoing calls.