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  2. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    The installation of a conventional wired telephone set has four connection points, each of which may be hardwired, but more often use a plug and socket: telephone line to phone cord: The wall jack. This connection is the most standardized, and often regulated as the boundary between an individual's telephone and the telephone network.

  3. 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 ...

  4. 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]

  5. Registered jack - Wikipedia

    en.wikipedia.org/wiki/Registered_jack

    For four-wire data line (DSX-1) RJ48S 8P4C, keyed For four-wire data line (DDS) RJ48X 8P4C with shorting bar For four-wire data line (DS1) RJ49C 8P8C: For ISDN BRI via NT1 RJ61X 8P8C: For four telephone lines RJ71C 50-pin 12-line series connection using 50-pin connector (with bridging adapter) ahead of customer equipment.

  6. Modular connector - Wikipedia

    en.wikipedia.org/wiki/Modular_connector

    Only lines 1 and 2 have electrical compatibility, with T568A wiring, and only line 1 with T568B wiring, because Ethernet-compatible pin assignments split the third pair of RJ25 across two separate cable pairs, rendering that pair unusable by an analog phone. (With T568B wiring, a telephone may connect to line 3 as line 2.) Both the third and ...

  7. ANSI/TIA-568 - Wikipedia

    en.wikipedia.org/wiki/ANSI/TIA-568

    Because pair 1 is on the center pins (4 and 5) of the 8P8C connector in USOC and both T568A and T568B, a telephone will connect to line 1 of both T568A and T568B as well as all of the above registered jacks, but if a second line is used (3 and 6) is used, it connects to line 2 (pair 2) of USOC and T568A jacks, but to pair 3 of T568B jacks. This ...

  8. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    Their names are derived from the telephone plugs used for connecting telephone calls in manual switchboards. One side of the line is connected to the metal tip of the plug, and the second is connected to a metal ring behind the tip, separated and insulated from the tip by a non-conducting material. When inserted into a jack, the plug's tip ...

  9. Home wiring - Wikipedia

    en.wikipedia.org/wiki/Home_wiring

    For details on the telephone connection see the section titled "telephone" in this article. Note the connection of the security system to the phone line requires a wiring configuration that allows the security system to disconnect all phones in the home when it needs to connect to the monitoring center. This is critical, if the wiring is not ...