12.1 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
       \  pair3    T1  5      White/Blue        5
        \----------R3  6  ... Green ........... 6  RecvData -
     T4  7      White/Brown       7
     R4  8      Brown             8

     12.2 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

     12.3 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

     12.4 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.

     12.5 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