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rj45 pin layout

rj45 pin layout

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rj45 pin layout

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Thread: rj45 pin layout

  1. #1
    Join Date
    Feb 2012
    Posts
    414

    Default rj45 pin layout

    I have generally always wired all 8 wires, but with 100mhz transmission only 4 wires (2 pairs) are actually being used, what I am looking for is which rj45 connections are the 4 wires being used.

    I have a cat 6 run 1 pair is the dsl high band to modem via a pots filter, one pair is used for a phone line, that leaves 2 pair (4 wires) that is unused. I wanted to try and use the remainder 2 pairs as a network patch from 2nd floor to basement so a another cable run is not necessary. I just need to know the jack wiring positions used.
    Donald Kerr
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  2. #2
    Join Date
    Feb 2012
    Location
    Welland Ontario
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    398

    Default

    The standard is for pins 1&2 and 3&6. That would be the orange and green pairs.
    Operation Overlord.

  3. #3
    Join Date
    Feb 2012
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    414

    Default

    I am not sure which 2 pairs I already used but as long as I know the pin positions of the rj45 jack and can utilize the other 2 pairs as a network patch.

    Thanks
    Donald Kerr
    Author and Creator of...
    http://www.wiringdoneright.com
    Don't Let Your House go up in Flames
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  4. #4
    Join Date
    Feb 2012
    Location
    Welland Ontario
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    Default

    This is the standard layout I use.

    rj45 pin layout-rj45wiring-gif
    Last edited by chrisb; 08-04-2013 at 11:44 AM.
    Operation Overlord.

  5. #5
    Join Date
    Nov 2012
    Location
    Welland, Ontario Canada
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    48

    Default

    For jacks, the standard is 568B pattern (although by industry standards is is considered the "alternate method"). Some places use the sister configuration 568A. Truth is it does not matter what colour it is as long as you are doing the same on both ends. The jack pin numbers will match the pin numbers that Chris posted above (568B), but the punch down order (colour) will be different depending on the style of jack. As an example pins 1 and 2 on the Belden Jack is Wt/Bl - Bl, etc.

    Cheers

    John
    John Kuehnl-Cadwell
    Master Electrician
    Datawise Solutions Inc
    www.datawisesolutions.ca

  6. #6
    Join Date
    Feb 2012
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    414

    Default

    Thanks I only need the wall jack pin locations, the patches from wall jack to network switch or computer will be pre manufactured patch cords. The send and receive pairs must each be from the same twisted pair in the cable. So pins 1 & 2 come from one pair and pins 3 & 6 come from a different pair with the other end wired identically.
    Last edited by dkerr; 08-05-2013 at 10:23 PM.
    Donald Kerr
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  7. #7
    Join Date
    Nov 2012
    Location
    Welland, Ontario Canada
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    Default

    Is this what you are looking for? http://www.networktechinc.com/standard.html

    Just copied the wiki answer as it was just as good as any explanation I could provide...

    10BASE-T and 100BASE-TX only require two pairs to operate, located on pins 1 plus 2 and pins 3 plus 6. Since 10BASE-T and 100BASE-TX need only two pairs and Category 5 cable has four pairs, it is possible, but not standards compliant, to run two network connections or use spare pairs for PoE (Power over Ethernet) (or a network connection and two phone lines) over a Category 5 cable by using the normally unused pairs (pins 4–5, 7–8) in 10- and 100-Mbit/s configurations. In practice, great care must be taken to separate these pairs as most 10/100-Mbit/s hubs, switches, and PCs electrically terminate the unused pins.[citation needed] Moreover, 1000BASE-T requires all four pairs to operate, pins 1 and 2, 3 and 6 — as well as 4 and 5, 7 and 8.

    Cheers

    John
    Last edited by Navyguy; 08-06-2013 at 12:11 AM.
    John Kuehnl-Cadwell
    Master Electrician
    Datawise Solutions Inc
    www.datawisesolutions.ca

  8. #8
    Join Date
    Feb 2014
    Location
    San Diego
    Posts
    9

    Default

    As you said you have 2 unused pair and going to use it as network patch. I suggest to use it for backup and testing in case any internet problem occur. So you can test Either it is wiring problem or ISP. We also have backup wiring in office and it's Structured Cabling is done by Telesystemscorp

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