Table
4-2 (Page 2 of 2). PCI BIOS Setup Program Parameters
Parameter Names
Values
Edge-level:
Level
Note: Parameter names can vary with different PCs.
Fast Ethernet Cabling
The 100BASE-TX specification supports 100-Mbps transmission over
two or four pairs of twisted-pair Ethernet cabling. In two-pair cabling,
one pair of cables is used for transmission, and the other is used for
reception and collision detection.
Because a 125-MHz frequency is used on the wire, 100BASE-TX
requires category 5 cabling.
Segment lengths are limited to 100 m (328 ft) with 100BASE-TX for
signal-timing reasons.
Fast Ethernet Hubs
New hubs are becoming available to support a variety of Fast
Ethernet LAN configurations. These hubs can be divided into two
basic types: shared and switched. The 10/100 EtherJet PCI Adapter
or the 10/100 EtherJet PCI Adapter with Wake on LAN can be used
with either type of hub for 10-Mbps or 100-Mbps operation.
Shared Hubs
In a shared network environment, PCs are connected to hubs. A
repeater is built into each port of the hub. All ports of the repeater
hub share a fixed amount of bandwidth, or data capacity.
A 100-Mbps shared hub means that all nodes on the hub must share
the 100 Mbps of bandwidth. As stations are added to the hub, the
effective bandwidth available to any individual station becomes
smaller.
Think of a shared repeater hub as a single-lane highway that
everyone uses. As the number of vehicles on the highway
increases, the traffic becomes congested and transit time for
individual cars increases.
4-6
10/100 EtherJet PCI Adapters
Title: ASB3CNTL CreationDate: 07/16/98 18:07:52
