Rules for making cable

Rules for making cable

Heuristic to think of the last year now do network maintenance day, every day line, pinch line, sometimes a day pinch more than 100 network cable. Based on the discovery that many of the computer-born small partners are unfamiliar with the network cable, the following roughly literacy.

Network cable, eight copper wire, in order to reduce the mutual interference of electromagnetic signals, each two according to a certain density twisted together. In this way, the transmission of the electrical signals between each other, the wave will cancel each other, effectively eliminating interference. Twisted pair The name is also because of this structure and lead out. On the outside, there is a layer of toughness and high protective skin protection. The first use of twisted pair was used for telephone signal transmission, which was gradually introduced into digital signal transmission, in a long time ago, we are basically using the 3-type twisted pair, the maximum can reach 16Mbps of bandwidth, and now we are widely used in computer networks are super five-type twisted-pair and six-type twisted-pair line. Maximum bandwidth of up to 1000Mbps. Twisted pair of the only drawback is that the transmission distance is shorter, can only reach 100 meters, so in the wiring, if the use of star topology structure, covering the range can only reach 200*200 meters.

1000M network card data transmission is two-way, need to use four pairs of lines, that is 8 core wire. 100M below, generally use 1, 2, 3, 6, four root line. According to the standard is orange, green a total of four lines. 1, 31 groups, 2, 61 groups 4, 5 for the standby line 7, 8 for the telephone line.

T568A standard line order from left to right is: 1-green white, 2-green, 3-orange white, 4-blue, 5-blue-white, 6-orange, 7-brown, 8-brown.

T568B standard line order from left to right is: 1-orange white, 2-orange, 3-green white, 4-blue, 5-blue-white, 6-green, 7-brown, 8-brown.

1 output data (+)

2 output data (-)

3 input data (+)

4 Reserved for telephone use

5 Reserved for telephone use

6 input data (-)

7 Reserved for telephone use

8 Reserved for telephone use

This shows that, although the twisted pair has 8 cores, but in the current widely used in the hundred-gigabit network, actually only used 4 of them, namely, the 1th, 2nd, 3rd, 6th, they play the role of receiving and sending signals respectively. So there is a novel 4-core network of production, can also be called 1-3, 2-6 crossover method, this crossover cable core line arrangement rule is: the network cable one end of the 1th foot of the other end of the 3rd foot, network cable at the end of the 2nd foot of the other end of the 6th foot, the other foot one by one corresponding can be, that is, in the above introduction of the crossover cable production Throw away the extra 4 lines.