100 Mbps cable specifications
This is an ASCII file called CABLE100.TXT in the ATI
CardAssistant INFO directory. Use a text editor or a
word processor with a mono-space font such as Courier
to print this file if needed for reference.
************************************************************
** **
** Specifications and recommendations for 100 Mbps cabling**
** **
************************************************************
NOTE: For 10 Mbps operation, refer to the "10 Mbps cabling
specifications" information file.
This document covers the following topics:
Twisted-Pair Ethernet (TPE) cabling
===================================
The ATI AT-2500TX PCI adapter has an RJ-45 connector for
use with TPE cabling. TPE cabling is also known as
RJ-45 cabling, Unshielded Twisted Pair (UTP), and 10BaseT
cabling.
For more information on the 10BaseT specification, contact
your local network supplier or call the IEEE at
800-678-IEEE.
Recommended cables
------------------
For 100 Mbps operation, the cable must comply with the IEEE
802.3 10BaseT 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
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, hubs and switches
provide 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.
Link integrity
==============
There are three LEDs on the ATI AT-2500TX PCI adapter:
100 light for 100 Mbps operation
ACT light for activity
LNK light for link
Refer to the "Diagnostic LEDs" information file for
brief descriptions.
Note: The ACT LED indicates read/write activity 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.
Reset or power off/on your hub or switch.
Polarity problems
-----------------
A common problem in 10BaseT wiring is crossing the positive
and negative phases of the transmit and receive signals
(for example, crossing pins 1 (TX+) and 2 (TX-)).
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