1. intelpro.exe Driver
2. CABLE100.TXT File Contents

CABLE100.TXT Driver File Contents (intelpro.exe)

   100 Mbps cabling specifications
                                                                    v1.00


Specifications and recommendations for Twisted-Pair Ethernet
============================================================

The EtherExpress(TM) PRO/100B adapters have a small, snap-in RJ45
connector.

RJ45 cabling is also known as Twisted-pair Ethernet (TPE) or Unshielded
twisted pair (UTP), and 10BASE-T.

This document covers the following topics:

-  Recommended cables

-  Cable and connector pinouts

-  Link integrity

-  Common problems

For more information on the 100BASE-TX specification, ISO/IEC 8802-3,
contact your local network supplier or call the IEEE at 800-678-IEEE.


Recommended cables
==================

The cable must comply with the IEEE 802.3 10BASE-T standard for 2-pair,
Category 5, UTP cable.

The cable between the computer and the hub must be less than 100 meters
long.

This UTP cable works well:

Manufacturer       Model number         No. of pairs
------------------------------------------------------
Belden             1588A                     2

The EtherExpress PRO/100B adapters do not support pre-10BASE-T
concentrators.


Cable and connector pinouts
===========================

If you need to repair a cable or provide connectors for UTP cable, wire
straight through as shown in the following table.

Function    Pin#               Pin#
-------------------------------------
  TX+        1    <-------->    1
  TX-        2    <-------->    2
  RX+        3    <-------->    3
  RX-        6    <-------->    6

Use only four of the eight pins. Pins 1 and 2 must be a pair, and pins 3
and 6 must be a pair.

To allow for a straight-through cable, the hub provides an internal
transmit/receive crossover function. This means the transmit circuit of
the network card is connected to the receive circuit of the hub and vice
versa.

Pinout for the RJ45 connector
-----------------------------
   ----------              -------------------------
1 |--        |          8 |------------             |
2 |--        |          7 |------------             |
3 |--         ---       6 |------------             |
4 |--            |      5 |------------             |
5 |--            |      4 |------------             |
6 |--         ---       3 |------------             |
7 |--        |          2 |------------             |
8 |--        |          1 |------------             |
   ----------              -------------------------
END                           TOP

Pin name and function:

1  Transmit Data Plus. The positive signal for the TD differential pair.
   This signal contains the serial output data stream transmitted onto
   the network.

2  Transmit Data Minus. The negative signal for the TD differential pair.
   This contains the same output as pin 1.

3  Receive Data Plus. The positive signal for the RD differential pair.
   This signal contains the serial input data stream received from the
   network.

4  not used

5  not used

6  Receive data minus. The negative signal for the RD differential pair.
   This signal contains the same input as pin 3.

7  not used

8  not used


Link integrity
==============

There are 3 LEDs on the EtherExpress PRO/100B adapter: A LNK light for
link, a ACT light for activity, and a 100 light which indicates a 100
Mbps connection.

Note: The ACT LED indicates that there is read/write activity on the
      network. It doesn't always mean there is activity on the adapter.


Common problems
===============


A hub can't detect a workstation
--------------------------------

This is often the result of a crossed wire in the cable or wiring closet.
Make sure the wiring is correct.


Workstations can't connect to the network
-----------------------------------------

Make sure hub port is configured to the correct speed. Also, make sure
last line in the NET.CFG file reads:
   
   lastdrive=F (for NETX systems)
   
     or
   
   lastdrive=Z (for VLM systems)

Also try resetting the concentrator or hub or turn the power off and on.


Polarity problems
-----------------

A common problem in 10BASE-T wiring is crossing the positive and negative
phases of the transmit or receive signals (for example, crossing pins 1
(TX+) and 2 (TX-).

EtherExpress PRO/100 adapters automatically detect this problem and
adjust for it internally.

Even though the current EtherExpress PRO/100 adapters can take care of
this crossover for you, it's best to check your wiring and correct this
problem if you find it.



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