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Number One Crossbar Switching System

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The Number One Crossbar Switching System (1XB switch), was the primary technology for designing urban telephone exchanges in the Bell System in the mid-20th century. [1]

29 relations: Bell System, Boolean algebra, Brooklyn, Class-4 telephone switch, Common control, Cord circuit, Crossbar switch, Dial tone, Direct distance dialing, Director telephone system, Dual-tone multi-frequency signaling, Junctor, Karnaugh map, Marker (telecommunications), Multi-frequency signaling, No. 4 Electronic Switching System, Number Five Crossbar Switching System, Number One Electronic Switching System, Outside plant, Panel switch, Routing in the PSTN, Stepping switch, Stored program control, Telephone exchange, Telephone line, Telephone number, Telephone numbering plan, Telephone switchboard, Wire wrap.

Bell System

The Bell System was the system of companies, led by the Bell Telephone Company and later by AT&T, which provided telephone services to much of the United States and Canada from 1877 to 1984, at various times as a monopoly.

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Boolean algebra

In mathematics and mathematical logic, Boolean algebra is the branch of algebra in which the values of the variables are the truth values true and false, usually denoted 1 and 0 respectively.

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Brooklyn

Brooklyn is the most populous borough of New York City, with a census-estimated 2,648,771 residents in 2017.

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Class-4 telephone switch

A class-4, or tandem, telephone switch is a U.S. telephone company central office telephone exchange used to interconnect local exchange carrier offices for long distance communications in the public switched telephone network.

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Common control

In telecommunication, a common control is an automatic telephone exchange arrangement in which the control equipment necessary for the establishment of connections is shared by being associated with a given call only during the period required to accomplish the control function for the given call.

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Cord circuit

In telecommunication, 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.

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Crossbar switch

In electronics, a crossbar switch (cross-point switch, matrix switch) is a collection of switches arranged in a matrix configuration.

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Dial tone

A dial tone is a telephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephone, when an off-hook condition is detected.

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Direct distance dialing

Direct distance dialing (DDD) is a telecommunication service feature in which a caller may, without operator assistance, call any other user outside the local calling area.

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Director telephone system

In a large city there may be multiple telephone exchanges serving subscibers within the boundary of the telephone system for that city, e.g. Manchester.

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Dual-tone multi-frequency signaling

Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers.

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Junctor

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.

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Karnaugh map

The Karnaugh map (KM or K-map) is a method of simplifying Boolean algebra expressions.

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Marker (telecommunications)

A marker is a type of special purpose control system that was used in electromechanical telephone central office switches.

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Multi-frequency signaling

In telephony, multi-frequency signaling (MF) is a signaling system that was introduced by the Bell System after World War II.

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No. 4 Electronic Switching System

The No.

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Number Five Crossbar Switching System

The Number Five Crossbar Switching System (5XB switch) is a telephone switch for telephone exchanges designed by Bell Labs and manufactured by Western Electric starting in 1947.

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Number One Electronic Switching System

The Number One Electronic Switching System (1ESS) was the first large-scale stored program control (SPC) telephone exchange or electronic switching system in the Bell System.

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Outside plant

In telecommunication, the term outside plant has the following meanings.

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Panel switch

The Panel Machine Switching System is an early type of automatic telephone exchange for urban service, introduced in the Bell System in the 1920s.

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Routing in the PSTN

Routing in the PSTN is the process used to route telephone calls across the public switched telephone network.

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Stepping switch

In electrical controls, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths, directed by a train of electrical pulses.

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Stored program control

Stored program control (SPC) was a telecommunications technology used for telephone exchanges controlled by a computer program stored in the memory of the switching system.

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Telephone exchange

A telephone exchange is a telecommunications system used in the public switched telephone network or in large enterprises.

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Telephone line

A telephone line or telephone circuit (or just line or circuit within the industry) is a single-user circuit on a telephone communication system.

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Telephone number

A telephone number is a sequence of digits assigned to a fixed-line telephone subscriber station connected to a telephone line or to a wireless electronic telephony device, such as a radio telephone or a mobile telephone, or to other devices for data transmission via the public switched telephone network (PSTN) or other private networks.

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Telephone numbering plan

A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints.

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Telephone switchboard

A telephone switchboard is a telecommunications system used in the public switched telephone network or in enterprises to interconnect circuits of telephones to establish telephone calls between the subscribers or users, or between other exchanges.

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Wire wrap

Wire wrap was invented to wire telephone crossbar switches, and later adapted to construct electronic circuit boards.

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Redirects here:

1XB, 1XB switch, 1xb switch.

References

[1] https://en.wikipedia.org/wiki/Number_One_Crossbar_Switching_System

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