Tuesday, February 13, 2007

Straight - Cross - Rollover Cable

Straight - Cross - Rollover Cable

Straight-through cable
A straight-through cable is the standard network cable connection and is used to connect the source and destination computers through an internetworking device. Specifically, you can use it to connect a host to a hub or switch.

Crossover cable
In a crossover cable, the standard RJ-45 cable between the source and destination computers is cross-connected. A crossover cable can be used to connect:
* Two computers
* Two hubs
* A hub to a switch
* A cable modem to a router
* Two router interfaces

Rollover cable
These Cisco proprietary cables used to connect to a router or switch console port. In a rollover cable (8 pins), RJ-45 connectors are usually present at each ends and are used to connect router and computer ports. Pin 1 on one end of cable connects to Pin 8 at the other end of the cable, similarly, Pin 2 connects Pin 7, and so on.

(taken from : http://searchnetworking.techtarget.com/generic/0,295582,sid7_gci1049608,00.html?bucket=REF&topic=299266)

All cable is consist of RJ45 plug and CAT Cable (CAT5, CAT5E, & CAT6). See other post for wiring diagram.

How to quick test the cable to determine its type ?

There are three types of commonly used RJ-45 cabling: straight, cross and rolled. Hold the two ends of an RJ-45 cable side by side. There are eight colored strips, or pins, at each end. If the order of the colored pins is the same at each end, the cable is straight. If the order of the colors is reversed at each end, the cable is rolled. Examine the sequence of colored wires to determine the type of RJ-45 cable.

note : if cable is not straight or rollover, see 123&6 core, if it meshed then it is crossover. Or check its 4-5-7-8, if same color. Better to use cable tester for sure.

(taken from : http://www.cisco.com/warp/public/701/14.html#topic4)


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