CABLE100.TXT Driver File Contents (es322.exe)

   100 Mbps cabling specifications

100 Mbps Cabling Specifications for Intel EtherExpress(TM) 
PRO/100+ TX PCI Adapters

The adapters have a small, snap-in RJ45 connector. 
RJ45 cabling is also known as Twisted-pair Ethernet (TPE), 
Unshielded twisted pair (UTP), and 10BASE-T cabling.

The type of cabling you must use depends on the adapter
you're using.

This document covers the following topics:

- PRO/100+ adapters

- Link integrity

- Common problems
   NOTE: For 10 Mbps operation, refer to the 10 Mbps cabling
   specifications help file.

PRO/100+ Adapters

Recommended cables

The cable must comply with the IEEE 802.3 10BASE-T standard
for 2-pair, Category 5, UTP cable. Select a high-quality
brand of Category 5 cable from your local supplier.

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

PRO/100+ 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

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 an RJ45 connector on a cable
      ----------              -------------------------
     |        --|8          8 |------------             |
     |        --|7          7 |------------             |
  ---         --|6          6 |------------             |
 |            --|5          5 |------------             |
 |            --|4          4 |------------             |
  ---         --|3          3 |------------             |
     |        --|2          2 |------------             |
     |        --|1          1 |------------             |
      ----------              -------------------------
END                           TOP

Pin name and function:

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

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

3  Receive Data Plus (RD+). 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 (RD-). The negative signal for the RD
   differential pair. This signal contains the same input as
   pin 3.

7  Not used.

8  Not used.

Connecting two workstations without a hub

100BASE-T uses a star topology. This means a hub or
concentrator is in the center of a star, and each
workstation or server is connected to this hub.

For test purposes, you can directly connect two workstations
or a workstation and a server without using a hub. This
setup requires a special cable incorporating the crossover
function. The table below shows which wires need to be 
crossed over.

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

   NOTE: This is not an IEEE supported configuration and
   should be used for test purposes only.

Link Integrity

There are three LEDs on the adapter:

1. A LNK light for link

2. An ACT light for activity

3. A 100 light which indicates a 100 Mbps connection

Refer to your adapter Installation Guide or the "Diagnostic
LEDs" readme file for complete information.
   NOTE: The ACT LED indicatesactivity on the network, 
   not necessarily 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)

   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-)).

PRO/100+ adapters automatically detect this
problem and adjust for it internally. However, it's best to
check your wiring and correct this problem if you find it.

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