The twisted pair is divided into 4 pairs of 8 different color lines and twisted together to form a team twist. The effect of electromagnetic twist and external electromagnetic interference is minimized. The twisted pair can be shielded according to whether it is added with a metal mesh sleeve. Divided into shielded twisted pair STP and unshielded twisted pair UTP
According to market research, the current Gigabit network cable has become very common, but many friends are still not very familiar with the Gigabit cable crystal head connection. In the process of making the network cable, they will encounter various problems, sometimes it will not open. Web page. Before we start, we need to have a correct understanding of the production of the network cable, so as to create the network cable we need.
The network cable consists of a twisted pair of long distances and an RJ45 head. The twisted pair is divided into 4 pairs of 8 different color lines and twisted together to form a team twist. The effect of electromagnetic twist and external electromagnetic interference is minimized. The twisted pair can be shielded according to whether it is added with a metal mesh sleeve. It is divided into shielded twisted pair STP and unshielded twisted pair UTP. In the EIA/TIA-568A standard, twisted pairs are classified into three types, four types, and five types according to electrical characteristics.
When making a network cable head, the most important thing is to know that only four of the eight lines are for data exchange, and the four, 1, 2, 3, and 6 are used to send and receive data. The two sets of wires are used in pairs, that is, 1, 2, and 3, and 6 are two sets of wires wound together, and the requirement of satisfying the 100-megabit bandwidth is not problematic.
The national standard line sequence is a kind of internationally accepted standard for the production of network cable lines for convenient modules such as network interface sockets on the wall.
To achieve the connection of two computers with only one network cable, the two lines of the network cable can be adjusted. According to the national standard, the end of the line ends of the network cable is 568A and the other end is 568B. That is, the receiving group line at one end becomes the other transmitting group line.
The practice of the 100M network cable may be familiar to everyone. Here we will focus on the Gigabit network cable practices and precautions.
100M network cable practice orange white orange green white blue white green brown white brown
Gigabit network line practice green white green orange white brown white brown orange blue white
By contrast, we found that the network order is very different.
The local area network is to connect individual microcomputers or terminals to each other by using communication lines, and to exchange information according to a certain protocol to realize resource sharing. Among them, communication lines, that is, transmission media commonly used are twisted pairs, coaxial cables, optical fibers, and the like. In terms of cost performance and maintainability, most LANs use unshielded twisted pair UTP-Unshielded Twisted Pair as the transmission medium for wiring.
The most commonly used in the network is that Category 3 and Category 5 lines currently have more than six types of lines, which is also the best choice for Gigabit cable head connection.
The third type of twisted pair cable is commonly used as a 10 Mbps Ethernet data and voice transmission in the LAN conforming to the IEEE 802.3 10Base-T standard.
The fifth type of twisted pair currently occupies the largest LAN market with a maximum rate of up to 100 Mbps in compliance with the IEEE 802.3 100Base-T standard.
Two twisted pair wire sequences 568A and 568B are specified in the EIA/TIA cabling standard.
Standard 568A orange-white--2 orange--2 green-white--3 blue--4 blue-white--5 green--6 brown-white--7 brown--8
Standard 568B Green White - 1 Green - 2 Orange White - 3 Blue - 4 Blue White - 5 Orange - 6 Brown White - 7 Brown - -8.
A network connection that uses a wiring method in the entire network cabling but has an RJ-45 plug at both ends is common in the network regardless of whether the termination mode A or the termination mode B is used. The order of the twisted pairs corresponds to the pin number of the RJ45 head.
The 10M Ethernet network cable uses 1, 2, 3, and 6 numbered core wires to transmit data. 100M Ethernet network cables use 4, 5, 7, and 8 numbered core wires to transmit data. Why do we now use 4-pair 8-core twisted pair cable? This is mainly to meet the needs of a wider range of applications without the need to change the infrastructure to meet the wiring requirements of a wide range of user equipment. For example, we can use one of the twisted wires to realize voice communication at the same time.
Rj45 crystal head RJ45 head crystal head network connector RJ45 wiring connector 100BASE-T4 RJ-45 pair twisted pair specification as follows rj45 crystal head RJ45 head crystal head network connector RJ45 wiring 1, 2 for sending 3, 6 for receiving 4, 57, 8 are two-way lines. The 1 and 2 lines must be twisted 3, 6 twisted 4, 5 twisted 7 and 8 twisted pairs.
The following describes how to make twisted pair cables in several application environments:
MDI indicates that this port is a level port and MDI-X indicates that the port is a normal port.
1 The network cable used for PC and other network devices connected to the HUB is the one-to-one connection of the two ends of the straight-through twisted pair. At this time, the HUB is the MDI-X port and the PC is the MDI port. 10Mbps network cable as long as one pair of twisted pair ends
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