Ethernet Cabling
A discussion about Ethernet cabling is an important one. You need to really understand the following three types of cables:
A-Straight-through cable.
B-Crossover cable.
C-Rolled cable
We will look at each in the following sections.
1-Straight-Through Cable
The straight-through cable is used to connect the following devices:
A-Host to switch or hub
B-Router to switch or hub
Four wires are used in straight-through cable to connect Ethernet devices
Notice that only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6.
B-Crossover Cable
The crossover cable can be used to connect the following devices:
A-Hub to hub
B-Host to host
C-Hub to switch
D-Router to host
E-Switch to switch
F-Router to Router via Fast Ethernet ports
The same four wires used in the straight-through cable are used in this cable; we just connect different pins together Notice that here we connect pins 1 to 3 and 2 to 6 on each side of the cable.
C-Rolled Cable
You can use a rolled Ethernet cable to connect a host EIA-TIA 232 interface to a router console serial communication (COM) port. If you have a Cisco router or switch, you would use this cable to connect your PC running HyperTerminal to the access router console. Eight wires are used in this cable to connect serial devices, but not all eight are used to send information.
A discussion about Ethernet cabling is an important one. You need to really understand the following three types of cables:
A-Straight-through cable.
B-Crossover cable.
C-Rolled cable
We will look at each in the following sections.
1-Straight-Through Cable
The straight-through cable is used to connect the following devices:
A-Host to switch or hub
B-Router to switch or hub
Four wires are used in straight-through cable to connect Ethernet devices
Notice that only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6.
 |
| Straight Cable |
The crossover cable can be used to connect the following devices:
A-Hub to hub
B-Host to host
C-Hub to switch
D-Router to host
E-Switch to switch
F-Router to Router via Fast Ethernet ports
The same four wires used in the straight-through cable are used in this cable; we just connect different pins together Notice that here we connect pins 1 to 3 and 2 to 6 on each side of the cable.
 |
| Crossover cable |
C-Rolled Cable
You can use a rolled Ethernet cable to connect a host EIA-TIA 232 interface to a router console serial communication (COM) port. If you have a Cisco router or switch, you would use this cable to connect your PC running HyperTerminal to the access router console. Eight wires are used in this cable to connect serial devices, but not all eight are used to send information.
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