Use straight-through cables for the following cabling:
?– Switch to router
?– Switch to PC or server
?– Hub to PC or server
Use crossover cables for the following cabling:
?– Switch to switch
?– Switch to hub
?– Hub to hub
?– Router to router
Pin Label Pin Label
Hub/Switch Server/Router
Crossover Cable
8
8 1
1
wgwb
g o b br
wow br
8
1
Some wires on cable ends are crossed.
Cable 10BASE-T/
100BASE-TX Straight-Though
1 TX+ 1 TX+
2 TX??“ 2 TX??“
3 RX+ 3 RX+
4 NC 4 NC
5 NC 5 NC
6 RX??“ 6 RX-
7 NC 7 NC
8 NC 8 NC
wowb
o g b br
wgw br
1 8
Connecting to an Ethernet LAN 123
?– Router Ethernet port to PC NIC
?– PC to PC
Figure 1-107 When to Use a Straight-Through Cable Versus a Crossover Cable
Figure 1-108 illustrates how a variety of UTP cable types might be required in a given
network. Note that the category of UTP required is based on the type of Ethernet that you
choose to implement.
Figure 1-108 Using Varieties of UTP
Straight-Through Cable Crossover Cable
10 Mbps
Category 3,4,5
Straight-Through
100 Mbps
Category 5
Straight-Through
100 Mbps
Category 5
Straight-Through
10 Mbps
Category 3,4,5
Crossover
1000 Mbps
Category 5
Crossover
124 Chapter 1: Building a Simple Network
Summary of Connecting to an Ethernet LAN
This section summarizes the key points that were discussed in this lesson:
?– A NIC or LAN adapter plugs into a motherboard and provides an interface for
connecting to the network.
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