Rj45 crystal head making wiring method
In the local area network system we are in contact with, many network cables are made and connected by users themselves, but in the process, we found that many network cable connection methods are not standardized, and at the same time bring to the future network maintenance and inspection trouble. The following figure is the correct RJ45 crystal head wiring diagram of the network cable. The RJ45 crystal head connection method is divided into T568A and T568B. The two wiring methods are basically the same. The difference is that the first pair of T568B is orange and the first pair of T568A is green. 
If you directly connect two PCs with a peer-to-peer network with a network cable, the connection method should be T568A at one end and T568B at the other end. If networking through a network hub or network switch, the two ends of the network cable should be the same as T568A or T568B, the common one is the connection of T568B.
1. Wiring standards We are using UTP (unshielded twisted pair) to make network cables, which mainly follow the ANSI / TIA / EIA-568A (T568A for short) and ANSI / TIA / EIA-568B (T568B for short) standards.
The T568B standard is generally used more. In network projects that use category 3 twisted pair, category 5 twisted pair, and enhanced category 5 twisted pair, the T568B wiring standard is generally followed. When category 5 twisted pair is used, its transmission The speed can reach 100Mbps.
In use, T568A / T568B can only be distinguished in wiring color.
The wiring order of T568A is: green-white, green, orange-white, blue, blue-white, orange, brown-white, brown.
The T568B cable sequence is: orange white, orange, green white, blue, blue white, green, brown white, brown.
2. Functions of each pin of RJ-45 (10BaseT / 100BaseTX):
1. Transfer data positive Tx +
2. Transfer data negative Tx-
3. Receive data positive Rx +
4. Unused 5. Unused 6. Accept data negative Rx-
7. Not used 8. Not used
Third, the production process:
1. Draw a small piece of thread first, and then peel off the skin.
2. Untwist the twisted pairs in reverse.
3. According to the standard cable, it is very important to pay attention to this.
Generally we use T568B standard direct connection method. The specific arranging method is: first arrange the lines in the order of "orange green blue brown, white first", then cross 4-6, the order after crossing is "orange white, orange, green white, blue, blue white, green, Brown and white, brown ". The wiring sequence at the other end is the same.
But in special cases, such as direct interconnection of two machines and network transfer, cross connection method is needed: one end is in the order of T568B, that is, in the above order. The other end is in the order of T568A, the specific cable arrangement method: first sort in the order of "orange, green, blue, brown, white first", first cross 4-6, then cross 1-3, 2-6, the cross result is "green white, Green, orange-white, blue, blue-white, orange, brown-white, brown ".
Arrangement order of the lines: take the line with the left hand, the line head is facing outward, and the order is from left to right. Hold the plug in your right hand and insert the wire core with the metal reed facing upward.
4. Stranded wire ends.
5. Insert the plug, the eight wires should follow the same standard.
6. Clamp with clamp.
7. Use a tester to test.
Four: Arrangement order of twisted pairs in various situations:
1. PC to HUB:
Direct connection method: According to the T568B standard, that is, in the order of "orange and white, orange, green and white, blue, blue and white, green, brown and white, brown".
2. Network transfer and dual-machine interconnection:
Cross connection method: one end is arranged according to the T568B standard, that is, in the order of "orange and white, orange, green and white, blue, blue and white, green, brown and white, and brown". At the other end, according to the T568A standard, "green-white, green, orange-white, blue, blue-white, orange, brown-white, brown".
Five, matters needing attention:
The twisted pair must be arranged in the above order to ensure a smooth network speed. Some people directly correspond to the twisted pair, although they can be used, but because the 1-3 line and the 2-6 line are not a pair of lines to the end, the anti-interference ability is poor, so the network speed is slow and the distance is long Unstable.
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