Networking Cabling Pinouts

Contributed by rdelaplaza@worldnet.att.net.

1.0 Standard EIA/TIA 568

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

    1.1 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

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

                  /--T2  1   White/Orange
                 /             
          pair 2 \
                  \--R2  2   Orange

         /-----------T3  3   White/Green
        /
       /         /---R1  4   Blue
 pair3 \  pair 1 \---T1  5   White/Blue
        \
         \-----------R3  6   Green

                  /--T4  7   White/Brown
                 /
          pair 4
                 \
                  \--R4  8   Brown

     1.3 USOC (Universal Service Order Code)
                          8     6
                         pins  pins    Color
                          
       /-------------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

2.0   Plugs and Jacks

     The EIA/TIA specifies an RJ-45 (ISO 8877) connector for Unshielded
     Twisted Pair (UTP) cable.  The plug is the male component crimped
     on the end of the cable while the jack is the female component in
     a wall plate or patch panel, etc.  Here is the pin numbering to
     answer the question, where is pin one?

         Plug                          Jack
  (Looking at connector          (Looking at cavity
   end with the cable             in the wall)
   running away from you)

      ---------- /                   ----------
     | 87654321 |                   | 12345678 |
     |__      __|/                  |/_      /_|
        |____|                         |/___|
 
3.0 Standard Networking Configurations

     With reference to T568B above;
      ATM 155Mbps uses pairs 2 and 4 (pins 1-2, 7-8)
      Ethernet 10Base-T uses pairs 2 and 3 (pins 1-2, 3-6)
      Ethernet 100Base-T4 uses pairs 2 and 3 (4T+) (pins 1-2, 3-6)
      Ethernet 100Base-T8 uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6,
7-8)
      Token-Ring uses pairs 1 and 3 (pins 4-5, 3-6)
      TP-PMD uses pairs 2 and 4 (pins 1-2, 7-8)
      100VG-AnyLAN uses pairs 1,2,3 and 4 (pins 4-5, 1-2, 3-6, 7-8)

4.0 Ethernet 10Base-T Cabling

     4.1 Ethernet 10Base-T Straight Thru patch cord (T568B colors);

                   RJ45 Plug                RJ45 Plug
                   =========                =========

         /---------T2  1  ... White/Orange .... 1  TxData +
   pair2 
         \---------R2  2  ... Orange .......... 2  TxData -

         /---------T3  3  ... White/Green ..... 3  RecvData +
        /
       /         / R1  4      Blue              4
pair 3    pair 1
       \         \ T1  5      White/Blue        5
        \
         \---------R3  6  ... Green ........... 6  RecvData -

                 / T4  7      White/Brown       7
           pair 4
                 \ R4  8      Brown             8



      4.2 Ethernet 10Base-T Crossover patch cord;

This cable can be used to cascade hubs, or for connecting two Ethernet
stations back-to-back without a hub (ideal for two station Doom!)  Note
pin numbering in item 10.0 above.

     RJ45 Plug  1 Tx+ -------------- Rx+ 3  RJ45 Plug
                2 Tx- -------------- Rx- 6
                3 Rx+ -------------- Tx+ 1
                6 Rx- -------------- Tx- 2


      4.3 Ethernet 10Base-T to USOC Crossover patch cord;

      RJ45 8-pin Plug  1 ---White/Orange--- 2  USOC 6-pin Plug
                       2 ------Orange------ 5
                       3 ---White/Green---- 1
                       6 ------Green------- 6

      4.4 Crossover Implementation
A simple way to make a crossover patch cable is to take a dual-jack
surface mount box and make the crossover between the two jacks. This
allows using standard patch cables, and avoids the nuisance of having a
crossover cable find its way into use in place of a regular patch cable.

     4.5 Stranded Patch Cables
The color code used in stranded patch cables is different from
solid-conductor cables. For NorTel Digital Patch Cable (DPC), the coding
is;

   Pair 1: Green & Red
   Pair 2: Yellow & Black
   Pair 3: Blue & Orange
   Pair 4: Brown & Gray

(OBTAINED FROM
(HTTP://WWW.CIS.OHIO-STATE.EDU/HYPERTEXT/FAQ/USENET.LAN/CABLING-FAQ/FAQ-DOC-0.HTML)
(HTML'S  faq-doc-9 to 12)

This is a good one.

IBM brand extended 101 keys keyboard
with modular connector (like a 6 pin RJ-45 but with side tabs)
to regular DIN 5 PC keyboard connector.

 Plug
  (Looking at connector
   end with the cable
   running away from you)

       /              /|
      /              / |
      --------------    /|
    _| 6 5 4 3 2 1  |_ //
   |_|______________|_|/

DIN 5 Plug (male)   (Looking at connector end with the cable running
away from you)

                  U -----------(guide)
              1.     .3
               4.   .5
                  2.

                Keyboard Cable pinouts

 Keyboard connector   DIN 5 connector (Male)

1.- Not Connected
2.- ----------------- pin 2 (center)
3.- ----------------- pin 4
4.- ----------------- pin 1
5.- ----------------- pin 5
6.- Not Connected