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Table Of Contents  CertiGuide to Network+
 9  Chapter 0001:  LAN Cabling

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IX  Combining Cable Technologies
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X  Real-World LAN Cabling
(Page 3 of 3)

Patch Cable

The term “patch cable” is bandied about as if it was some magic wire to fix something that is broken. That is almost a true statement. The purpose of a patch cable is to connect the permanent (typically inside a wall or ceiling) wiring to a device such as a hub, switch, router, or PC. This allows completion of the circuit in the physical layer of network wiring without feeling that changing the network would be as difficult as climbing a tall mountain.

Follow the directions to make your own loopback connector.

Straight Cable

Normally, most 10xBaseT patch cables are “straight through” or “straight” cables. Signals are passed directly from the pins in the permanent wiring jack, to the pins on the network device being attached. Understand that the pins on an RJ45 connector used with 10xBaseT cabling are numbered 1-8. A straight cable is a patch cable whose wires are connected from pin N on one side, straight through to the same pin on the other side.

Crossover Cables

A crossover cable is a patch cable that crosses the TX (transmit) and RX (receive) wires. That is, pins 1 and 3 are cross connected in both directions, as are pins 2 and 6, like this:

1,3 <> 2,6

To connect two PC’s using 10xBase-T networking without a hub or patch panel, create a crossover cable by switching pins 1 and 3 as well as 2 and 6. This cable may also be used for troubleshooting a portion of a network.


Figure 22: Straight through Cable pinouts

 

Figure 23: Crossover Cable Pin outs

 

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