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Dhika Cikul » Blog Archive » Crossover Ethernet Cable

Crossover Ethernet Cable

Posted by cikul | Posted in Networking | Posted on 28-01-2009-05-2008

37

An Ethernet crossover cable is a type of Ethernet cable used to connect computing devices together directly where they would normally be connected via a network switch, hub or router, such as directly connecting two personal computers via their network adapters.  (Wikipedia)

rj45plug-8p8cTo create crossover cable, we must know first how we count the pin position in RJ45. In the image illustrated in the left side, we can see that we count the pin from the bottom side, start from pin number 1 in left side until pin number 8 in right side.

We must sure that all pin are complete (8 pin), if not complete we must change with another RJ45 that have complete PIN. In my experience, i usually found a RJ45 that not have complete PIN, so we can’t use this. So you must carefully.

straight-rj45

This image represent a Straight Ethernet Cable, both 2 RJ45 has same color arrangement, this straight cable usually use when your computer connect to Switch or router.

Different with cross ethernet cable or so called crossover ethernet cable. For cross ethernet cable, we need to switch the Green set of wires in place with the Orange set of wires.

cross-rj45

All Image taken from blog.icalvyn.com

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Comments posted (37)

nice work.

When conecting a network card directly to a network card you need a crossover cable. If your using a hub or switch you would use a “regular” straigh through network cable.

Yes this is good tutorial, I go to Cisco academy and I was learn that long time ago but it is good descreption for beginers good post. googluck!

it is good tutorial…

good tt.
When is use don’t forget to set-up a static IP-adress at the both computers. otherwise they will search, but not find a dynamic IP.

goodluck

increible el sitio me gusto!

Thanks for this tutorial, it is useful beginners.

great pictures!!

this one importan me

One Line was earlier a Dot.

thank u

This is really good

this is good and also be attractive

this is nice beautiful an so important. thanks all of you

thanks all of you and we need more then this

mga vovo d n uso color coding

mga vovo d n uso color coding s straight

Tama mga tanga d n uso coding

Tama mga tanga d n uso coding WEEEEEEE IKAW N,,,, D BEST K EH…….

helpful

this is wrong ..straight cable starts green white-green-orange white-blue-blue white-orange-brown white – brown … what u have shown in ur second diagram ..the same will be for straight cable

In your diagram.. T-568A – T-568A will be a straight cable and T-568A – T-568B will be a cross cable according to standard…although this combination will work but its not according to standard

hi

The information listed here is to assist Network Administrators in the color coding of Ethernet cables. Please be aware that modifying Ethernet cables improperly may cause loss of network connectivity. Use this information at your own risk, and insure all connectors and cables are modified in accordance with standards. The Internet Centre and its affiliates cannot be held liable for the use of this information in whole or in part.

T-568A Straight-Through Ethernet Cable

The TIA/EIA 568-A standard which was ratified in 1995, was replaced by the TIA/EIA 568-B standard in 2002 and has been updated since. Both standards define the T-568A and T-568B pin-outs for using Unshielded Twisted Pair cable and RJ-45 connectors for Ethernet connectivity. The standards and pin-out specification appear to be related and interchangeable, but are not the same and should not be used interchangeably.

T-568B Straight-Through Ethernet Cable

Both the T-568A and the T-568B standard Straight-Through cables are used most often as patch cords for your Ethernet connections. If you require a cable to connect two Ethernet devices directly together without a hub or when you connect two hubs together, you will need to use a Crossover cable instead.

RJ-45 Crossover Ethernet Cable

A good way of remembering how to wire a Crossover Ethernet cable is to wire one end using the T-568A standard and the other end using the T-568B standard. Another way of remembering the color coding is to simply switch the Green set of wires in place with the Orange set of wires. Specifically, switch the solid Green (G) with the solid Orange, and switch the green/white with the orange/white.

Ethernet Cable Instructions:

Pull the cable off the reel to the desired length and cut. If you are pulling cables through holes, its easier to attach the RJ-45 plugs after the cable is pulled. The total length of wire segments between a PC and a hub or between two PC’s cannot exceed 100 Meters (328 feet) for 100BASE-TX and 300 Meters for 10BASE-T.
Start on one end and strip the cable jacket off (about 1″) using a stripper or a knife. Be extra careful not to nick the wires, otherwise you will need to start over.
Spread, untwist the pairs, and arrange the wires in the order of the desired cable end. Flatten the end between your thumb and forefinger. Trim the ends of the wires so they are even with one another, leaving only 1/2″ in wire length. If it is longer than 1/2″ it will be out-of-spec and susceptible to crosstalk. Flatten and insure there are no spaces between wires.
Hold the RJ-45 plug with the clip facing down or away from you. Push the wires firmly into the plug. Inspect each wire is flat even at the front of the plug. Check the order of the wires. Double check again. Check that the jacket is fitted right against the stop of the plug. Carefully hold the wire and firmly crimp the RJ-45 with the crimper.
Check the color orientation, check that the crimped connection is not about to come apart, and check to see if the wires are flat against the front of the plug. If even one of these are incorrect, you will have to start over. Test the Ethernet cable.

Ethernet Cable Tips:

A straight-thru cable has identical ends.
A crossover cable has different ends.
A straight-thru is used as a patch cord in Ethernet connections.
A crossover is used to connect two Ethernet devices without a hub or for connecting two hubs.
A crossover has one end with the Orange set of wires switched with the Green set.
Odd numbered pins are always striped, even numbered pins are always solid colored.
Looking at the RJ-45 with the clip facing away from you, Brown is always on the right, and pin 1 is on the left.
No more than 1/2″ of the Ethernet cable should be untwisted otherwise it will be susceptible to crosstalk.
Do not deform, do not bend, do not stretch, do not staple, do not run parallel with power cables, and do not run Ethernet cables near noise inducing components.

Basic Theory:

By looking at a T-568A UTP Ethernet straight-thru cable and an Ethernet crossover cable with a T-568B end, we see that the TX (transmitter) pins are connected to the corresponding RX (receiver) pins, plus to plus and minus to minus. You can also see that both the blue and brown wire pairs on pins 4, 5, 7, and 8 are not used in either standard. What you may not realize is that, these same pins 4, 5, 7, and 8 are not used or required in 100BASE-TX as well. So why bother using these wires, well for one thing its simply easier to make a connection with all the wires grouped together. Otherwise you’ll be spending time trying to fit those tiny little wires into each of the corresponding holes in the RJ-45 connector.

thank u very mach

so intersting for undersatand to any one

why T-568a an T-568b are not same

thank you very much

details

very useful, thank you very much…………

Thank You For ADD About RJ45

i am very intalijent ma poura kam kar layta hu networking ka

Thanks for you posting.
Please posting RJ-11, thanks

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