When.com Web Search

  1. Ads

    related to: local telephone exchanges near me location map 34221

Search results

  1. Results From The WOW.Com Content Network
  2. Telephone exchange names - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange_names

    Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]

  3. List of United States telephone companies - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    In the following states and regions, the primary local carrier is not an RBOC: Lumen Technologies, in addition to its role as the RBOC in the areas of 14 states gained from its acquisition of Qwest, Lumen serves other rural, suburban, and smaller city local exchanges, as well as most of the Las Vegas metropolitan area, covering a total of 16 states.

  4. 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 ...

  5. Public switched telephone network - Wikipedia

    en.wikipedia.org/wiki/Public_switched_telephone...

    The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists of telephone lines, fiber-optic cables, microwave transmission links, cellular networks ...

  6. Local exchange carrier - Wikipedia

    en.wikipedia.org/wiki/Local_exchange_carrier

    Local exchange carrier (LEC) is a regulatory term in telecommunications for the local telephone company. In the United States , wireline telephone companies are divided into two large categories: long-distance ( interexchange carrier , or IXCs) and local (local exchange carrier, or LECs).

  7. List of North American Numbering Plan area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_North_American...

    this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.

  1. Ad

    related to: local telephone exchanges near me location map 34221