171:, had both simple wire junctors and circuit junctors. Circuit junctors were in the form of plug-in circuit boards to provide talk battery and supervision for intraoffice calls and were closely similar to intraoffice trunk packs, with two scan points and two signal distributor points per circuit, two circuits per plug-in pack. Wire junctors were two-wire connections between trunk nets and other trunk nets or line nets. When
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was introduced, three-port conference trunks were used, which only appeared on trunk nets. All junctors appeared in subgroups of sixteen on plugs or jacks at the
Junctor Grouping Frame, where as many subgroups as required were plugged into other trunk nets, line nets, or circuit junctor frames.
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of manual exchanges. The junctors for incoming calls were simple three-wire connections between the incoming frame and the line frame. In the later electromechanical
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In early electromechanical switches, a "district junctor" handled supervision and
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duties for outgoing calls, similar to the duties of the
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192:Scudder, F.J.; Reynolds, J.N. (January 1939).
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220:No. 5 Crossbar - Bell Labs Record Compilation
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167:Stored-program analog switches such as the
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194:"Crossbar Dial Telephone Switching System"
117:Learn how and when to remove this message
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143:Number Five Crossbar Switching System
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217:Bell Telephone Laboratories (1949).
139:Number One Crossbar Switching System
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