Thursday, February 5, 2009

cross cable__


Below is the wiring diagram of both the Straight Through and Cross-Over cables:

Straight Through Cable


CAT5 Cable :// Palmetto Networks

Cross-Over Through Cable

CAT5 Cross-Over Cable :// Palmetto Networks


RJ45 Clip ( Registered Jack 45 Clip)

An connecter used to connect 4 pair ( 8 wire) Unshielded Twisted Pair (UTP) cable. RJ-45 connectors look similar to the RJ-11 connectors used for connecting telephone equipment, but the RJ45 somewhat wider than RJ11.

The tool used to connect RJ45 with Unshielded Twisted Pair (UTP) cable, is called ' Crimping tool'

There are lot of crimping tools available with RJ45+RJ11 support.

We can make two types Unshielded Twisted Pair UTP network cables by changing the wire combinations.

  • 1) Crossover cable
  • 2) Straight Through cable

Crossover Cable

Crossover cable can be used to directly connect two computers

to each other without the use of a hub or switch in networking. It also used to connect two hubs or switch without the use of an uplink port in LAN to expand the network.

How to make Crossover Ethernet Cable:

  1. Strip off about 2 inches of the cable sheath.
  2. Untwist the pairs - don't untwist them beyond what you have exposed, the more untwisted cable you have the worse the problems you can run into.
  3. Align the colored wires according to the diagrams below.
  4. Trim all the wires to the same length, about 1/2" to 3/4" left exposed from the sheath.
  5. Insert the wires into the RJ45 end - make sure each wire is fully inserted to the front of the RJ45 end and in the correct order. The sheath of the cable should extend into the RJ45 end by about 1/2" and will be held in place by the crimp.
  6. Crimp the RJ45 end with the crimper tool
  7. Verify the wires ended up the right order and that the wires extend to the front of the RJ45 end and make good contact with the metal contacts in the RJ45 end.
  8. Cut the cable to length - make sure it is more than long enough for your needs. Remember, an end to end connection should not extend more than 100m (~328ft). Try to keep cables short, the longer the cable becomes the more it may affect performance, usually noticable as a gradual decrease in speed and increase in latency.
  9. Repeat the above steps for the second RJ45 end.
  10. If a cable tester is available, use it to verify the proper connectivity of the cable.

That should be it, if your cable doesn't turn out, look closely at each end and see if you can find the problem. Usually a wire ended up in the wrong place or more commonly, one of the wires didn't extend to the front of the RJ45 connector and is making no, or poor contact. If you see a mistake or problem, cut the end off and start again.

Straight Through Cable

Straight-through cables are used for a variety of connections.
e.g.

  • Connecting a computer to a hub or switch,
  • Connecting a computer to a cable/ISDN/DSL modem,
  • End-user devices (e.g., printers) to networking devices such as hubs and switches.

Straight-through: A straight-through network cable is just what the name implies, a cable that passes data straight through from one end to another.

It can also be used to directly connect like devices (e.g., two hubs or two switches) if the cable is plugged into an uplink port on one (but not both) of the devices. Crossover cable is used to connect two like devices without the use of an uplink port.

How to make Straight Through Ethernet Cable:

Follow the same steps in Cross cable method, except aligning the colored wires.
Align the colored wires according to the diagrams below.





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