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Chapter 2
Board Installation
The Wake-on LAN feature is not working.
Make sure the WOL cable is attached and power is applied to the computer.
Check the BIOS for its WOL setting. Some computers may need to be
configured to WOL.
Make sure the network cable is fully attached to the adapter.
Link LED does not light when power is connected.
Make sure WOL cable is attached and power is applied to computer.
Make sure network cable is attached at both ends.
Technical Information
Fast Ethernet Wiring
100BASE-TX Specification: The 100BASE-TX specification supports 100 Mbps
transmission over two pairs of category 5 twisted-pair Ethernet (TPE) wiring. One pair is
for transmit operations and the other for receive operations. Segment lengths are limited
to 100 meters with 100BASE-TX for signal timing reasons. This complies with the EIA
568 wiring standard.
Fast Ethernet Hub and Switches
The two basic types of hubs are shared hubs and switching hubs. Intel PRO/100+ adapters
can be used with either type of hub for 10 Mbps. At 100 Mbps, a TX hub or switch is
required.
Shared hubs
In a shared network environment, computers are connected to hubs called repeaters. All
ports of the repeater hub share a fixed amount of bandwidth, or data capacity. On a 100
Mbps shared hub, all nodes on the hub must share the 100 Mbps of bandwidth. As stations
are added to the hub, the effective band-width available to any individual station gets
smaller. Shared hubs do not support full duplex.
Think of a shared repeater hub as a single-lane highway that everyone shares. As the
number of vehicles on the highway increases, the traffic becomes congested and transit
time increases for individual cars.
On a shared hub all nodes must operate at the same speed, either 10 Mbps or 100 Mbps.
Fast Ethernet repeaters provide 100 Mbps of available bandwidth, ten times more than
whats available with a 10BASE-T repeater.
Repeaters use a well-established, uncomplicated design, making them highly cost effective
for connecting PCs within a workgroup. These are the most common type of Ethernet
hubs in the installed base.
Switching hubs
In a switched network environment, each port gets a fixed, dedicated amount of bandwidth.
In the highway scenario, each car has its own lane on a multi-lane highway and there is no
sharing.
In a switched environment, data is sent only to the port that leads to the proper destina-
tion station. Network bandwidth is not shared among all stations, and each new station
added to the hub gets access to the full bandwidth of the network.
