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  2. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    The 25-pair color code, ... When used for plain old telephone service (POTS), the first wire is known as the tip or A-leg ... Line 4 orange brown/white pink

  3. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    Older houses often have 4-conductor telephone station cable in the walls color coded with Bell System colors: red, green, yellow, and black as 2-pairs of 22 AWG (0.33 mm 2) solid copper; "line 1" uses the red/green pair and "line 2" uses the yellow/black pair.

  4. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    The length of the line to a customer telephone interface presents a resistance across which the central office voltage experiences a drop and therefore the voltage at the customer site may vary. The nominal battery ( system ) voltage is 52.1 V, based on a 24-cell lead-acid battery. [ 1 ]

  5. Registered jack - Wikipedia

    en.wikipedia.org/wiki/Registered_jack

    Since the sets are ordered, an orange (color 2 in its set) with a yellow (color 4) is the color scheme for the 4·5 + 2 − 5 = 17th pair of wires. If the yellow is the more prominent, thicker stripe, then the wire is a tip conductor connecting to the pin numbered 25 + the pair #, which is pin 42 in this case.

  6. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    Shown below are the cabling arrangements for both 4-wire and 6-wire cable. Initially 4-wire was used and many older installations still use it, then the 6-wire became the new standard, but the 4-wire has latterly been reissued to all Openreach technicians as part of cost savings. Modern 4-wire however is the same diameter as 6-wire to allow ...

  7. 66 block - Wikipedia

    en.wikipedia.org/wiki/66_block

    A split-50 M-type 66 block with bridging clips attached. A 66 block is a type of punch-down block used to connect sets of wires in a telephone system. They have been manufactured in four common configurations, A, B, E and M. [a] A and B styles have the clip rows on 0.25" centers while E and M have the clip rows on 0.20" centers.

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  9. 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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