What are Straight and Crossover cables?…

Common Ethernet network cable are straight UTP (unshielded twisted pair) and crossover UTP cable. This Ethernet network cable is made of 4 pair high performance cable that consists of twisted pair conductors that are used for data transmission. At either end of these cables are plastic connectors called RJ45.

Straight Cable

You usually use straight cable to connect different type of devices. This type of cable will be used most of the time and can be used to:

1) Connect a computer to a switch/hub’s normal port.
2) Connect a computer to a cable/DSL modem’s LAN port.
3) Connect a router’s WAN port to a cable/DSL modem’s LAN port.
4) Connect a router’s LAN port to a switch/hub’s uplink port. (normally used for expanding network)
5) Connect 2 switches/hubs with one of the switch/hub using an uplink port and the other one using normal port.

If you need to check how straight cable looks like, it’s easy. Both side (side A and side B) of cable have wire arrangement with same color.

Crossover Cable

Sometimes you will use crossover cable, it’s usually used to connect same type of devices. A crossover cable can be used to:

1) Connect 2 computers directly.
2) Connect a router’s LAN port to a switch/hub’s normal port. (normally used for expanding network)
3) Connect 2 switches/hubs by using normal port in both switches/hubs.

In you need to check how crossover cable looks like, both side (side A and side B) of cable have wire arrangement with following different color .

Note
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┬áIf there is auto MDI/MDIX feature support on the switch, hub, network card or other network devices, crossover cableis then unneeded as the crossover function would be enabled automatically when it’s needed.
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Comments

  • Michael Schnepp

    Can you supply any further information as this is good stuff but needs more, would be very interested to hear from you.

  • Sonia Racliff

    Hello, i am liking this article. how do i know if i have MDI/MDIX on my switch?

  • Lyndon

    Really liked what you had to say in your post, What are Straight and Crossover cables? thanks for the good read!
    — Lyndon

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