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  2. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Kenmore 9392 is a five-pull (1L-4N) small-city telephone number for the Kenmore exchange in Fort Wayne, Indiana. MArket 7032 is a six-digit (2L-4N) telephone number. This format was in use from the 1920s through the 1950s, and was phased out c. 1960. BALdwin 6828 is an urban 3L-4N example, used only in the largest cities before conversion to ...

  3. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    Telephone exchange. A telephone operator manually connecting calls with cord pairs at a telephone switchboard. A modern central office, equipped with voice communication and broadband data capabilities. A telephone exchange, also known as a telephone switch or central office, is a crucial component in the public switched telephone network (PSTN ...

  4. List of telephone switches - Wikipedia

    en.wikipedia.org/wiki/List_of_telephone_switches

    DMS-10S (super small DMS-10 for very small exchanges, less than 640 lines) DMS-10M (prepackaged DMS-10, a Community Dial Office in a pre-packaged container/"box") DMS-100 FAMILY of Digital Exchanges DMS-100 (large local digital Class 5) (also known as an SL-100 when used as CPE (Customer Provided Equipment or PBX service)also known as Centrex.

  5. Number Five Crossbar Switching System - Wikipedia

    en.wikipedia.org/wiki/Number_Five_Crossbar...

    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. It was used in the Bell System principally as a Class 5 telephone switch in the public switched telephone network (PSTN) until ...

  6. Strowger switch - Wikipedia

    en.wikipedia.org/wiki/Strowger_switch

    Bank of two-motion switches. The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics, it is also known as a step-by-step (SXS) switch.

  7. Telephone switchboard - Wikipedia

    en.wikipedia.org/wiki/Telephone_switchboard

    PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

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