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  2. T-carrier - Wikipedia

    en.wikipedia.org/wiki/T-carrier

    The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.

  3. Plain old telephone service - Wikipedia

    en.wikipedia.org/wiki/Plain_old_telephone_service

    Plain old telephone service (POTS), or publicly offered telephone service, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for post office telephone service, [citation needed] as early telephone lines in many regions were operated directly by local ...

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

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

    Not assignable; N11 code for repair service for land-line telephones, customer service for wireless carriers 612: Minnesota (Minneapolis, Fort Snelling, St. Anthony, and Richfield) 1947: 1954: split to create 507; 1996: split to create 320; 1998: split to create 651; 2000: split to create 763 and 952; 613: Ontario (Ottawa metropolitan area and ...

  5. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A newer telephone cable used to carry telephone lines from several customers. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]

  6. Area codes 705, 249, and 683 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_705,_249,_and_683

    Area code 705 was created in a 1956 area code split from portions of the 613 and 519 numbering plan areas. After a reduction in geographic coverage in 1962, the numbering plan area was assigned a second area code, 249, in 2011 to form an overlay numbering plan. A third area code, 683, was added in June 2022.

  7. Circuit ID - Wikipedia

    en.wikipedia.org/wiki/Circuit_ID

    C = Service Code Modifier: 2 alphabetic characters. Required. Modifies meaning of the service code, often identifies different billing options. D = NPA: 3 digits. This is a required field. Numbering plan area code. E = NXX: 3 digits. This is a required field. Central office (exchange) code. F = Line: 4 digits. This is a required field.

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