What is a straight-through, cross-over and a roll-over cable?

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Cabling
Cross-over cable
Networking
roll-over cable
straight-through cable
What is a straight-through cable, a cross-over cable and a roll-over cable?
ASKED: January 29, 2008  10:04 PM
UPDATED: March 23, 2011  11:29 PM

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A patch cable (also called a straight through cable) is configured with all 8 wires in the same order on both ends of the cable. There are two standard wiring configurations used for patch cables. They are 568A and 568B. Either configuration can be used, so long as the same configuration is used at both ends of the cable.

With 568A:
Pin 1 – White/Orange
Pin 2 – Orange White
Pin 3 – White/Green
Pin 4 – Blue/White
Pin 5 – White/Blue
Pin 6 – Green/White
Pin 7 – White/Brown
Pin 8 – Brown/White

With 568B:
Pin 1 – White/Green
Pin 2 – Green/White
Pin 3 – White/Orange
Pin 4 – Blue/White
Pin 5 – White/Blue
Pin 6 – Orange/White
Pin 7 – White/Brown
Pin 8 – Brown/White

A cross over cable is configured with 4 of the wires in the same order on each end. The other four wires are crossed (hence the name). One end gets wired with the 568A configuration, while the other gets wired with the 568B configuration.

First End:
Pin 1 – White/Orange
Pin 2 – Orange White
Pin 3 – White/Green
Pin 4 – Blue/White
Pin 5 – White/Blue
Pin 6 – Green/White
Pin 7 – White/Brown
Pin 8 – Brown/White

Second End:
Pin 1 – White/Green
Pin 2 – Green/White
Pin 3 – White/Orange
Pin 4 – Blue/White
Pin 5 – White/Blue
Pin 6 – Orange/White
Pin 7 – White/Brown
Pin 8 – Brown/White

A rollover cable is wired with each pin on one end of the cable connected to the reverse pin on the other end. So the cable on Pin 1 on one end of the cable connects to Pin 8 at the other end, etc. Rollover cables are used to connect the serial port of a computer to the serial port of a network switch so that you can configure the network switch. These cables are not used for network connectivity.

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  • IT-Guy1509
    I couldn't say it any better my self. A straight is used for connecting 2 unlink devices such as; hub-computer, switch-computer. A Cross-over is used for connecting 2 like devices such as; computer-computer, computer-router (non config). A roll-over is used for connecting for configuration; config serial ports on routers, wap's, and etc.
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