Scheme of crimping twisted pair RJ-45

There are various options for connecting a computer to the global Internet, but the most common is still the method using Ethernet technology, that is, using a twisted pair. In this case, the cable is connected to the network card by means of a special connector - RJ-45. Next, we'll look at how the twisted pair crimp looks. However, first you need to talk about its design. A twisted pair is one or more pairs of twisted conductors, isolated from each other and covered with a plastic sheath. In our case, that is, to connect to the Internet, a network cable is used, which includes four pairs of such conductors.

Next, you need to determine the purpose for which it will be used before you attach the connector. There are two schemes of crimp twisted pair:
- direct - to connect the computer to a network splitter (switch), hub or router;
- Cross (crossover) - to connect two computers directly to each other.

If you need a direct circuit for crimping the twisted pair, then the conductors at both ends of the cable are located as follows:

In the case, if the scheme of crimping the twisted pair is crossed, the arrangement of the conductors will differ:
As a rule, network cards of modern computers know how to "understand" and direct scheme when directly connecting two PCs, but we recommend to reinsure and connect them using a crossover.

So, how is twisted pair twisted? To do this, you need the cable itself, a pair of RJ-45 connectors (preferably several) and a special crimp (or crimper) that has three working areas that perform certain functions. The closest thing to the handle is the knife, with which the conductors are cut off. Some varieties also have a special recess for removing the external insulation from the cable. In the center of the crimper is a socket, which serves directly for crimping the connector. And, finally, in the upper part there is a special area used for stripping the outer insulation of the twisted pair.

To begin with, cut the end of the network cable with the built-in knife and strip a few centimeters from the insulation with a notch. In the case of its absence, this can easily be done using an ordinary knife or scissors. Then, dilute, untwist and align the pairs of conductors. Then distribute them in colors, as indicated by the desired scheme of crimping the twisted pair, and align. Firmly squeeze and cut their ends with a crimper knife, leaving about 10 mm of woven conductors. Insert them into the connector, making sure that the slices rest against the ends of the troughs. Again, check that the conductors are correctly positioned in the colors, place the RJ-45 in the appropriate socket of the crimping pliers and squeeze their handles until the cable catch locks into place.

However, it may happen that you do not have a crimper near you. In this case, use an ordinary thin screwdriver. This method is more labor-intensive and less effective, but can be useful in emergency situations. In general, the procedure is similar to that described above. The only difference is that in order to drown the clamps of RJ-45 contacts, you need to press on them with the tip of a screwdriver, deployed across, until the teeth come into full isolation. Pressing should be strong, but nevertheless neat.

To test the performance of a compressed twisted pair there is a special device - LAN-tester. However, sometimes you can do without it - for a bad or not working network it will be clear that somewhere there was a mistake.

So, we have analyzed what twisted pair, crimp scheme is, and also the tools with which you can make a network cable. As you can see, this procedure is quite simple and does not require any special knowledge and skills - just mindfulness.