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Wiring a comms connection to rj45

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  • 09-08-2007 9:53pm
    #1
    coldfeet
    Closed Accounts Posts: 217 ✭✭


    hi all,

    I'm in a bit of a bind. I need to run a cable connection to comm ports. One is a comm port on a pbx switch and the other a standard comm port on a pc. Now i havent a comm cable that long so I'm gonna use standard cat 5 and cat 5 to comm connector. My problem is I'm not sure if I need a patch lead or crossover so I need a bit of help in the the wiring of the actual connectors as i've never done it before. I'm using the DB9F to RJ45 adaptor.

    I've if haven't explained myself clearly please come back with questions.


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    #2
    E. Fudd
    Registered Users Posts: 625 ✭✭✭E. Fudd


    Just a straight thru patch lead should suffice.


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    #3
    coldfeet
    Closed Accounts Posts: 217 ✭✭coldfeet


    If so how is the adapter that the patch lead plugs into wired.

    There's 8 pins in the comm face, theres then 8 coloured wires that need to connect into the back of the face, green, blue, orange, brown, yellow, white, red and black. What order do the go???


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    #4
    E. Fudd
    Registered Users Posts: 625 ✭✭✭E. Fudd


    Okay.....

    Presuming the comm face pins are numbered 1 - 8 (should be)
    The is it:

    Pin 1 - Grey
    Pin 2 - Brown
    Pin 3 - Yellow
    Pin 4 - Green
    Pin 5 - Red
    Pin 6 - Black
    Pin 7 - Orange
    Pin 8 - Blue

    This will give you straight through on the adapter, which means that in the unlikely event of you requiring a cross-over, you can just make up a standard cross over patch lead.

    Hope this helps.


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    #5
    coldfeet
    Closed Accounts Posts: 217 ✭✭coldfeet


    Cheers for that, you've been a great help, I knew boards wouldn't let me down.


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    #6
    E. Fudd
    Registered Users Posts: 625 ✭✭✭E. Fudd


    Sure let us know how it goes!


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    #7
    coldfeet
    Closed Accounts Posts: 217 ✭✭coldfeet


    Well I've got a definitive answer now to the problem I was having.

    The colour scheme dosen't matter in general, its only specific to the cable your making up, you can decide one week to have pin 2 as white and next week to have pin 2 as blue as long as the other end is related to the colour scheme you've chosen.

    The main concern is the order of the pins connected at each end. To use a long patch lead to conect the 2 connectors, I wired it as follows

    Connector 1 Connector 2
    White pin2 pin3
    Blue pin3 pin2

    Yellow pin4 pin6
    Green pin6 pin4

    Orange pin5 pin5

    Red pin7 pin8
    Black pin8 pin7

    Hope this makes sence.


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