Building Physical Ethernet LANs with UTP
The next section of this chapter focuses on the individual physical links between any two
Ethernet nodes, specifically those that use Unshielded Twisted Pair (UTP) cabling. Before
the Ethernet network as a whole can send Ethernet frames between user devices, each node
must be ready and able to send data over an individual physical link.
This section focuses on the three most commonly used Ethernet standards: 10BASE-T
(Ethernet), 100BASE-T (Fast Ethernet, or FE), and 1000BASE-T (Gigabit Ethernet, or GE).
Specifically, this section looks at the details of sending data in both directions over a UTP
cable. It then examines the specific wiring of the UTP cables used for 10-Mbps, 100-Mbps,
and 1000-Mbps Ethernet.
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