X Real-World LAN Cabling
(Page 3 of 3)
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.
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.
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:
Home - Table Of Contents - Contact Us
CertiGuide for Network+ (http://www.CertiGuide.com/netplus/) on CertiGuide.com
Version 1.0 - Version Date: November 7, 2004
Adapted with permission from a work created by Tcat Houser and Helen O’Boyle.
CertiGuide.com Version © Copyright 2004 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.