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  2. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    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 frames. Sometimes rough or ridge was added for jumper wires with a tactile code. [citation needed]

  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. Ring circuit - Wikipedia

    en.wikipedia.org/wiki/Ring_circuit

    The ring starts at the consumer unit (also known as fuse box, distribution board, or breaker box), visits each socket in turn, and then returns to the consumer unit. The ring is fed from a fuse or circuit breaker in the consumer unit. Ring circuits are commonly used in British wiring with socket-outlets taking fused plugs to BS 1363. Because ...

  5. E and M signaling - Wikipedia

    en.wikipedia.org/wiki/E_and_M_signaling

    T and R: Tip and Ring – the ground and battery of the receiver voice pair; T1 and R1: the ground and battery of the transmitter voice pair; 4-wire E&M uses a 4-wire (2-pair) transmission path for the voice signal. 2-wire E&M uses a single pair for both transmit and receive voice signal. This is much inferior to 4-wire E&M as the 2-wire ...

  6. Polarity symbols - Wikipedia

    en.wikipedia.org/wiki/Polarity_symbols

    Diagram showing positive tip polarity on the left and negative tip polarity on the right. To read diagram: The center positive drawing on the left indicates that the center (also known as the tip) of the output plug is positive (+) and the barrel (ring) of the output plug is negative (−). Center positive symbol Center negative symbol

  7. File:Tip-Ring-Sleeve plug.svg - Wikipedia

    en.wikipedia.org/wiki/File:Tip-Ring-Sleeve_plug.svg

    File:Tip-Ring-Sleeve plug.svg. Add languages. Page contents not supported in other languages. File; Talk; ... This diagram was created with a text editor.

  8. Enigma rotor details - Wikipedia

    en.wikipedia.org/wiki/Enigma_rotor_details

    The ring settings, or Ringstellung, are used to change the position of the alphabet ring relative to the internal wiring. Notch and alphabet ring are fixed together. Changing the ring setting will therefore change the positions of the wiring, relative to the turnover-point and start position. The ring setting will rotate the wiring.

  9. Loop start - Wikipedia

    en.wikipedia.org/wiki/Loop_start

    Loop start is a telecommunications supervisory protocol between a central office or private branch exchange (PBX) and a subscriber telephone or other terminal for the purpose of starting and terminating a telephone call.