Tag Archives: good quality crimper

How to Make an Ethernet Patch-cord

Tools and supplies needed for a network patch cord:

  • Twisted pairs cable
  • Scissors or cutter pliers
  • RJ45 male connectors
  • Good quality Crimper

Ethernet Network Tools
Ethernet Network Tools

Utp Cable Stripp
Utp Cable Stripp
Start by stripping the pvc cover off the twisted pairs cable. Remove about 3inches (7cm).
Separate and untwist the wires. Arrange the wires in order using your favorite cabling standard. Use the same standard for both of your ends.

If you are redoing just one end make sure you are copying the other one, otherwise your patch cord will not work.
I always use the same standard so I don’t get confused when I am redoing cables. I use the T568B standard because there is a little trick to remember the wires order. See at th post Mnemonic for Network Cable pinout for a trick on how to remember the cable order.

Network Cable Standards
Network Cable Standards – Wires order

Straighten UTP Wires

Straighten UTP Wires
Straighten Wires
Straighten the wires, making sure you keep them in order. It is very easy to mix the wires after putting them in order.
If doing this feels painfully difficult, try to find RJ45 male connectors with guides for wires. The guides keep the wires in place and help you insert them into the connector. It is a real help for a beginner.
Cut the wires just a little longer than the RJ45 connector.

Cut UTP wires
Cut UTP wires

Insert Wires RJ45
Insert Wires RJ45
Insert the wires into the connector ensuring that you keep them in the correct order. To keep the wires straight push up a little against the upper side of the connector while you slide them. This procedure helps you keep the wires aligned while inserting them.
When you reach the end of the connector the exterior jacket will be outside of the connector. Make sure you push a little more so that the jacket gets inside. at the time of the crimping the plastic indentation on the connector gets pressed on the exterior jacket, conferring the patch-cord more rigidity and resistance. If the jacket doesn’t get into the RJ45, the wires will be loose inside the connector. This will cause the wires to move and loosen up the point of insertion.

Insert Wires RJ45
Insert Wires RJ45

Crimp UTP RJrj45
Crimp UTP RJrj45
Crimp the connector maintaining the wires and the cable jacket inside the connector.
Inspect the cable, verifying that the wires are in the correct order.

Inspect RJ45
Inspect RJ45

Compare Ends RJ45
Compare the Ends patch cable
Proceed to the other end and untwist the wires. Maintain the same wires order. Redo the same operations as above.
Compare the two ends. Make sure they are identical. If they are not your cable will most likely not work.
For a 100Mb network only two pairs are needed, the active wires are at the pins 1,2,3 and6. For a 1Gb network, all of the four pairs are needed.

Compare RJ45 Ends
Compare RJ45 Ends

Network Cable Tester
Network Cable Tester
Depending on the nature of your job you might need to use a cable tester. For a small network a simple continuity tester will be sufficient. The tester injects a signal on one end and it tests the signal at the other end.
If the cable is correctly crimped all of the LED’s will light up in order. The shield LED might not light up if your connectors are not a shielded.
For bigger networks you will need a more complex tester that can measure attenuation, cable length, and can even give you an overall result of the point to point capability. This type of testers can sum up the various aspects of a measurement and tell you if your segment qualifies for a CAT3 or CAT5 or CAT6 connection.

Computer Network – RJ45 Crimper

Crimper Pro RJ45
Good Quality Crimper RJ45

Crimping tool

The crimper is very often the cause of bad connections. Buy a good quality crimper even if you use it for a few cables. Here are some problems associated with cheap crimpers:

  • Uneven force applied on the pins because of the angled compression.
  • Uneven wearing of the teeth and general faster wearing of the teeth.
  • The poor design of the crimper presses on the locking tabs and it reduces its flexibility to almost breaking them.
  • You need to apply two-three times more force when using a cheap crimper. You don’t have a ratchet system to guarantee a fully closed crimp and a release mechanism upon a complete crimp.

A good quality crimper will avoid all of the above and it will greatly improve your productivity; your RJ45 connectors will operate as expected for longer time; A good crimping tool costs 4 – 6 times more than the cheap ones. A good quality RJ45 crimper applies the force at the same time on all of the teeth, has a ratchet system and a release mechanism.

Crimper RJ45
Crimper RJ45

Cheap Crimping Tool
Cheap Crimping Tool

Professional Crimper RJ45
Professional Crimper RJ45

How to make a Loopback Cable

Why do I need a loopback cable?

Sometimes in order to test a computer’s hardware or software we need a network link for the network adapter. The solution, very often, is to carry around a hub. A loopback software adapter sometimes could help but in many cases it doesn’t work.
The best solution is to create a loopback cable. The loopback cable, or loopback addapter, will work as the computer, or router, or other networked device, was connected to a real network transmitting and receiving packets. The packets are sent and received in a loop, this kind of setup allowing the technician to troubleshoot hardware.

What is a loopback cable?

A loopback cable redirects the output back into itself. This effectively gives the NIC the impression that it is communicating on a network, since its able to transmit and receive communications.

How to make a loopback cable

The short description for a 100T base Ethernet loopback cable:
Redirect Pin 1 to Pin 3 and Pin 2 to Pin 6.
The detailed explanation with pictures follows:
Materials needed:
Good quality Crimper
Cutter pliers
RJ45 plug
Utility knife
UTP cable
Tools needed for crimping
Cat 5 Twisted Pairs Take a CAT3 or CAT5 UTP cable and strip the jacket trying to preserve the jacket intact, as you will need it later.
Maintain the wire twists as this will prevent electromagnetic interferences between the two pairs. Untwist the least possible so you could insert the wires into the RJ45 plug. For a 100T base loopback you only need two pairs, I choose orange and green pairs.
Bend the orange pair at the middle making a U shape.
CAT 5 twisted paires

Insert the Orange pair as follows:
White-Orange wire into the pin number 1 and pin number 3 and the solid Orange wire into pin number 2 and pin number 6. Try do insert the four ends at the same time as this is easier.

Pinout RJ45 Plug Loopbac
Click to enlarge
Pinout loopback cable

Crimping the cable

At this point you can crimp your plug for a 100T base loopback cable. Make sure you insert the cable jacket before crimping. The jacket has to be inserted into the plug about an inch so that it’s crimped in and offers rigidity to the loopback cable.

If you want your loopback cable to work at 1Gb you need to insert the second pair, (green), insert the cable jacket and only crimp after that. The green pair is inserted as follows: solid-Green wire in the pin 4 and pin 7 and white-green into 5 and 8.

Improve this article by commenting and asking questions.