Standard connection method for twisted pair wires

A lan connects a single computer or terminal using communication lines and follows certain protocols for information exchange to achieve resource sharing. Among them, communication lines, that is, commonly used transmission media include: twisted pair wires, coaxial cables, optical fiber cables, etc. Most local networks use unshielded twisted pair wires (UTP-unshielded twisted pair) as the transmission medium for cabling.

The network cable consists of a long-distance twisted pair wires and RJ45 headers. Twisted Pair wires are divided into 4 pairs by 8 lines of different colors. The Force twisting function is to minimize the impact of electromagnetic radiation and external electromagnetic interference, twisted Pair wires can be divided into shielded twisted pair wires (STP) and unshielded twisted pair wires (UTP) based on whether they are added with the screen layer of a wire mesh ). In EIA/TIA-568A standards, the twisted pair wires are divided by electrical characteristics: three types, four types, five types of lines. Three types of cables and five types of cables are most commonly used in the network. Currently, there are more than six types of lines. The third type of twisted pair wires are commonly used as 10 Mbps Ethernet data and voice transmission in the LAN, which complies with the IEEE 802.3 10base-t standard. Category 5 twisted pair wires currently occupy the largest LAN market with a maximum rate of 100 Mbps, meeting the BASE-T standard. Connect the RJ45 crystal head to the RJ45 socket of the network device, such as the NIC or hub. The RJ45 plug-in seat is also divided into three types or five types of electrical characteristics. RJ45 crystal head consists of metal parts and plastic parts, special attention is the pin number, when the metal parts face us from left to right PIN number is 1-8, this serial number is very important when connecting networks. The maximum transmission distance of twisted pair wires is 100 meters.

The wiring standards of EIA/TIA define the line sequence 568a and 568b of the two twisted pair wires. [Www.windsn.com]

Standard connection method for twisted pair wires

Twisted Pair wires are generally used for star network cabling, each twisted pair wires are connected to various network devices through the RJ-45 connectors installed on both ends (commonly known as the crystal head. The standard connection method of twisted pair wires is not specified at will. The purpose is to ensure the symmetry of the cable connector layout, so that interference between cables in the connector can be offset.

Cat5e cables are the most commonly used network cables for network cabling. They are divided into two types: shielded and unshielded. If it is used outdoors, The Screen Shield is better. Generally, it is enough to use non-shielded five-category cables in the room. Because no Screen Shield is provided, the cables are relatively soft, but their connection methods are the same. In general, there are four pairs of lines twisted together in the cat5e category and marked with different colors.

Twisted Pair wires have two Connection Methods: EIA/TIA 568b standard and EIA/TIA 568a standard.

Set the tail of the crystal head down (that is, the flat side up) from left to right to 1 2, 3, 4, 6, 7, 8, respectively. Below are the distribution of each line.

T568a line Sequence

1 2 3 4 5 6 7 8

Green, white, orange, white, blue, white, orange, brown, white, brown

T568b line Sequence

1 2 3 4 5 6 7 8

Orange white orange green white blue white green brown white Brown

Application of a wiring method in the entire network wiring, but there are RJ-45 plug network connection at both ends, whether it is the use of a, or B, it is common in the network. The order of the twisted pair corresponds to the pin number of the RJ45 header. 10 M Ethernet cables use, and 6 serial numbers to transmit data, while M Ethernet cables use, serial numbers to transmit data. Why are 4 pairs of twisted wires (8-core wires) used now? This is mainly to adapt to more use range, without changing the infrastructure, can meet the wiring requirements of a variety of user equipment. For example, we can use one pair of wires to implement voice communication at the same time.

100base-t4 RJ-45 on the twisted pair of the provisions of the following:

1 and 2 are used for sending, 3 and 6 are used for receiving, and 4, 5, 7, and 8 are bidirectional lines.

Line 1 and line 2 must be twisted, line 3 and line 6, line 4 and line 5, and line 7 and line 8.

Generally

Express CONNECT: both ends are connected in t568b line order.

Crossover line: one end is connected in t568a line Order and the other end is connected in t568b line order.

Connection details:

1) Peer Network (the NICS of two computers are directly connected): cross-line connection is adopted, and the connection methods on both ends of the network are different.
2) network adapter and switch (or hub): the connection method is the same as that at both ends of the network.
3) cascading between a vswitch and a vswitch (or hub): the crossover method is used, and the connection methods at both ends of the network cable are different.