Measure the test taker's understanding about how to create a network cable.

At present, lan construction has become very common. Without knowing it, small-sized LAN is everywhere around us, such as home LAN, game Internet cafes, school campus LAN and small-sized office network. Although they work in a variety of ways, these wired LAN must be connected through cables.

In the DIY craze, more people began to build their own networks. In this process, they first made plans, then purchased products, and finally made their own networks. When buying a network product, you must check whether the product can be bought. Fake products or quality products will directly affect the stability of the network. After purchasing the product, you should set up it.

When building a network, network cable production is a major focus, and the entire process should be accurate. Sorting errors and improper suppression will directly affect the use of the network cable, the network is disconnected or the network speed is slow. Next, I will briefly introduce how to create a standard network cable.

I. Understanding of tools and materials

Before creating a network cable, you must prepare relevant tools and materials. The primary tool is RJ-45 tool clamp, which has three different functions, the front end is the wire stripping port, which is used to strip the twisted pair housing. The middle is pressed RJ-45 head tool slot, where the RJ-45 head and twisted pair wires can be synthesized. The nearest end of the handle is a sharp Wire cutter, which can be used to cut the twisted pair.

The next material required is the RJ-45 head and twisted pair wires. Because the RJ-45 Avatar crystal as crystal transparent, so also known as the crystal head, each pair of twisted pair ends by installing the RJ-45 crystal head to connect with the nic and Hub (or switch. A twisted pair is a pair of cables enclosed in an insulated jacket that are twisted by two insulated wires to reduce interference between transmission signals.

Tool clamp for RJ-45

RJ-45 crystal head

Cat5e cat5e

As the saying goes: "to do good deeds, you must first sharpen your tools ". Here we will introduce you to how to make your tools "profitable" to get twice the result with half the effort. Like the RJ-45 tool clamp we see above, sometimes there will be a production of unqualified network cable, this is because the tool clamp tooth port is not aligned with the metal on the crystal head, so that the metal cannot be in correct contact with the network cable, as a result, the network cable cannot be connected. So in the selection of RJ-45 tool clamp, be sure to pay attention to tool clamp after the pressure of the above each tooth can be with the crystal head on the metal one to one corresponding, so as to ensure the production of qualified network cable.

Ii. network cable standards and Connection Methods:

There are two international standards for dual-line connection: EIA/TIA568A and EIA/TIA568B. There are two main connection methods for dual-line connection: pass-through cable and cross cable. Both ends of the water lens of the straight-through cable follow the 568A or 568B standard. Each line of the dual line corresponds one to one at both ends, and the color is the same in the corresponding slot of the crystal heads at both ends. It is mainly used to connect a common port or a common port of a switch or a general port of a hub to a computer Nic. The end of the crystal head of the crossover cable follows 568A, while the other end adopts the 568B standard, that is, 1 and 2 of the crystal head correspond to 3 and 6 of the B crystal head, 3 and 6 of the crystal head correspond to 1 and 2 of the B crystal head. It is mainly used for connecting A common port to A switch or A hub) to A common port or Nic.

3. network cable production:

(1) Cutting: Use the cutting edge of the crimping tool to cut the appropriate long-filled network cable.

(2) skin peeling: Use the cutting tool of the crimping tool to cut the wire head, and then put the wire head into the stripping tool port, so that the angle and Baffle of the wire head, slightly tighten the crimping tool and slowly rotate, remove the protection rubber of twisted pair wires from the knife port. (Note: just remove the thumb as long as you do)

Tip: The Block length of the network clamp is usually the length of the crystal head from the stripping knife port. This can effectively prevent the wire from being too long or too short. If the wire is too long, it is not beautiful. On the other hand, the cable cannot be stuck by the crystal head and is easy to loosen. The wire is too short. Because of the existence of the foreskin, it is too thick and cannot be completely inserted to the bottom of the crystal head, the crystal head plug-in cannot be in good contact with the core line of the network cable, of course, it cannot be created successfully.

(3) sorting: After peeling off the outer foreskin, you can see the 4-to-8-core wires of the twisted pair cable, and you can see that each pair of colors are different. Each pair of core wires is composed of a colored core wire and a white core wire with only a few colors. The four full-color cores are brown, orange, green, and blue. Each pair of wires is intertwined. When creating a network cable, you must split the eight wires of the four pairs one by one, straighten them out, and straighten them straight, then, sort the data in order.

Currently, there are two most commonly used wiring standards: The T568A standard and the T568B standard. The line sequence described in T568A is from left to right: 1-white green, 2-green, 3-white orange, 4-blue, 5-white blue, 6-orange, 7-white Brown, 8-brown. The line sequence described in T568B standard is from left to right: 1-white orange, 2-orange, 3-white green, 4-blue, 5-white blue, 6-green, 7-white Brown, 8-brown. We recommend that you use the T568B standard during network construction. Of course, T568A is also applicable to general cabling systems.

T568A/T568B

Arrangement of 8 crystal head pins:

Let shuichang head shape one side of the spring piece down, one side of the pin up, so that one end of the pin points away from their own direction, one end of the square hole to their own, at this time, the leftmost foot is the 1st foot, the rightmost foot is the 8th foot, and the rest are arranged in sequence.

Standard table T568A and standard table T568B

(4) cut together: Do not wrap the line straight as far as possible), do not overlap the flattening), squeeze the tight line along the way close to one direction), and then use the crimping tool to cut the wire head together. In this way, after the twisted pair wires are inserted into the crystal head, each line can have good contact with the pin in the crystal head to avoid poor contact. If the skin that was previously peeled is too long, you can cut the long thin line here, and keep the portion of the outer insulating skin about 14mm, this length can be inserted into each wire slot. If the length is too long, the crosstalk will be increased because the cable Pair does not twist each other, and the cable may be removed from the crystal head because the crystal head cannot press the jacket, this may cause poor contact or even interruption of the line.

(5) Insert: One and hold the crystal head with the thumb and middle finger, so that the side of the plastic shrapnel is down, and the side of the pin is away from its own direction, and it is pinned with the index finger; another hand held the twisted pair outside the rubber, slowly force 8 wires along the RJ-45 head at the same time 8 cable slots inserted, until the top of the cable slot.

(6) suppression: Confirm all the wires are in place, and thoroughly check the crystal head line sequence is correct, you can use the crimping clamp RJ-45 head. Push the RJ-45 head from one side of the teeth into the clamp groove, grip the Clamp with force (If your strength is not big enough, you can use both hands together ), press all the pins protruding from the outside into the crystal and place them in the header.

Iv. Conclusion

After both ends of the crystal head are completed, the network cable tester can be used for testing. If the eight indicators on the tester are green, the network cable is successfully created. If any lamp is a red or yellow light, it indicates that there is an open circuit or poor contact. At this time, it is best to press the crystal head at both ends with a wire clamp and then test again. If the fault persists, then, check whether the order of the core lines at both ends is the same. If the order is different, the crystal head will be made again according to the order of the core lines at the other end. If the core line sequence is the same, but the tester still displays a red or yellow light after re-acquisition, it indicates that the corresponding core line is not in good contact. There is no way at this point, so you have to cut one end and redo one crystal head in sequence at the other end of the core line, and then test again. If the fault disappears, you do not have to redo the crystal head at the other end, otherwise, you have to cut off the original crystal head at the other end and redo it. Until the test is completely green. For the production method, the order of the indicator lights on different testers is also different. If the lamp on the direct-through tester is on Sequentially, if the twisted pair wires are used, the shining sequence of the tester section should be 3, 6, 1, 4, 5, 2, 7, and 8.

Network cable Tester

I introduced the common methods for creating T568A and T568B international standard network cables. I hope that both beginners and network Veterans can follow the standard method to create network cables, in this way, network maintenance will bring a lot of convenience in the future.

Also, pay attention when buying a line. There are 5 types of lines, 3 types of lines can only reach 16 M, and 4 types of lines 20 M, only category 5 and Category 5 can reach M. the length of the Line cannot exceed 100 meters.