Ref: 09930012
Title: Wire Diagram for Type 3 Jumper Cable
date: 5/4/90

Copyright 3Com Corporation, 1991.  All rights reserved.

The IBM Token Ring Network uses two twisted pairs to transmit and
receive data.  Both of these pairs must retain their polarity
from the attaching device to the IBM 8228.  The wire must be #22
or #24 AWG (American Gauge Wire) with at least two twists per foot.
This improves the network's noise margin by lowering the amount of
crosstalk between the twisted pair wires.

Note:  This wiring scheme does not conform to the color coding in
usual telephony practice.  If the wires are not installed
correctly, the lobe will not function.  Further, if the pairs are
reversed, the adapter diagnostics supplied with the adapter,
which are designed to check out an adapter or wire fault assuming
correct wiring, will not detect an error, even though the lobe is not
operating.


Pin assignments for RJ-11 modular connector:

6-Pin Modular  Telephone                Type 3 Jumper  Data
Jack Pin       Wire           Line      Cable Color    Connector
Number         Connection     Name      Code           Color Code
------------   ----------     ------    ------------   ----------
  2            Pair 2-Tip      T-       Blue/White     Black
  3            Pair 1-Ring     R+       White/Orange   Red
  4            Pair 1-Tip      R-       Orange/White   Green
  5            Pair 2-Ring     T+       White/Blue     Orange


Pin assignments for RJ-45 modular connector:

8-Pin Modular  Telephone                Type 3 Jumper  Data
Jack Pin       Wire           Line      Cable Color    Connector
Number         Connection     Name      Code           Color Code
------------   ----------     ------    ------------   ----------
  3            Pair 2-Tip      T-       Blue/White     Black
  4            Pair 1-Ring     R+       White/Orange   Red
  5            Pair 1-Tip      R-       Orange/White   Green
  6            Pair 2-Ring     T+       White/Blue     Orange
