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  2. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    When used for plain old telephone service (POTS), the first wire is known as the tip or A-leg (U.K.) conductor, and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit. Neither of these two sides of the ...

  3. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    Utility pole with electric lines (top) and telephone cables. Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]

  4. Utility pole - Wikipedia

    en.wikipedia.org/wiki/Utility_pole

    A utility pole, commonly referred to as a transmission pole, telephone pole, telecommunication pole, power pole, hydro pole, telegraph pole, or telegraph post, is a column or post used to support overhead power lines and various other public utilities, such as electrical cable, fiber optic cable, and related equipment such as transformers and ...

  5. Standard Telephones and Cables - Wikipedia

    en.wikipedia.org/wiki/Standard_Telephones_and_Cables

    The London operation sold US-designed telephones and exchanges to fledgling British telephone companies. Because of the costs of importing products, the company purchased a failing electrical cable factory at North Woolwich in London, in 1898. In addition to making lead-sheathed cables, the factory started assembling equipment from components ...

  6. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    For larger cable assemblies more complex schemes, such as the 25-pair color code, are used. Some telephone technicians used mnemonic phrases, such as red-right-ring-rear, or ring-right-red-rough, to remember that the red wire connects to the right-side post in the wall jack and to the ring on the plug and to the rear lug on main distribution ...

  7. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...

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