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Data Communications Cabling FAQ
Section - 9.0 Standard EIA/TIA 568

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     The ANSI/EIA/TIA-568-1991 Standard _Commercial Building
     Telecommunications Wiring Standard_ defines pinouts;

     9.1 Standard EIA/TIA T568A
  (also called ISDN, previously called EIA)

        Pin  Wire Color
        ===  ==========
         /--T3  1   White/Green
   Pair3 \--R3  2   Green
        /----------T2  3   White/Orange
       /         /-R1  4   Blue
 pair2 \   pair1 \-T1  5   White/Blue
        \----------R2  6   Orange
         /--T4  7   White/Brown
   pair4 \--R4  8   Brown


     9.2 Standard EIA/TIA T568B
  (also called AT&T specification, previously called 258A)

         /--T2  1   White/Orange
   pair2 \--R2  2   Orange
        /----------T3  3   White/Green
       /         /-R1  4   Blue
 pair3 \   pair1 \-T1  5   White/Blue
        \----------R3  6   Green
         /--T4  7   White/Brown
   pair4 \--R4  8   Brown


     9.3 USOC (Universal Service Order Code)

   8-pins    6-pins
         |  |
     /-------------T4  1     White/Brown
    /    /---------T3  2  1  White/Green
   /    /    /-----T2  3  2  White/Orange
  /    /    /    /-R1  4  3  Blue
      pr4\ pr3\ pr2\ pr1\-T1  5  4  White/Blue
   \    \    \-----R2  6  5  Orange
    \    \---------R3  7  6  Green
     \-------------R4  8     Brown

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Top Document: Data Communications Cabling FAQ
Previous Document: 8.0 Cabling Standards
Next Document: 10.0 Birds and Bees (Plugs vs. Jacks)

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Send corrections/additions to the FAQ Maintainer:
pmac@fox.nstn.ca (Peter Macaulay)





Last Update March 27 2014 @ 02:11 PM