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Anonymous users2024-02-081.Twisted PairWire is a commonly used transmission medium in local area networks, especially in star topology networks. A twisted pair consists of two copper wires with an insulating protective layer, which are wound around each other at a certain density to reduce the degree of signal interference.
The twisted pair cables we commonly use consist of four pairs of twisted pairs, and different pairs have different degrees of winding.
Twisted pair cables can be divided into two categories: shielded twisted pair (STP) and unshielded twisted pair (UTP).
Among them, there are two types of shielded twisted pair cables of Category 3 and Category 5, and there are four types of unshielded twisted pair cables of Category 3, Category 4, Category 5 and Category 5 respectively. The rate of Category 3 twisted pair is 10MB s, the rate of Category 5 twisted pair can reach 100MB s, and the rate of Category 5 twisted pair can reach more than 155MB s. Shielded twisted pair because the outer layer of the cable has a layer of aluminum to reduce the small emission, which is more troublesome to make, and the price line is more expensive than the unshielded twisted pair, so we commonly use unshielded Category 5 and super 5 twisted pair in 10BASE-T or 100BASE-TX networks.
The twisted pair 568 cabling standard is divided into EIA TIA 568A and EIA TIA 568B. We generally use the EIA TIA 568B, as long as both ends of the twisted pair are arranged according to the following arrangement.
1 foot 2 feet 3 feet 4 feet 5 feet 6 feet 7 feet 8 feet.
White, orange, white, green, blue, white, blue, green, white, brown.
If it is a dual-machine interconnection or two hubs without cascade ports, you need to make a wrong connection (1236-3612)!
White Orange - White-green.
Orange - Green.
White-green -- white-orange.
Blue - Blue.
White-blue - white-blue.
Green - Orange.
White Brown - White Brown.
Brown Brown.
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Anonymous users2024-02-07The characteristics of twisted pair are long transmission distance, high transmission quality, convenient wiring, high cable utilization, strong anti-interference ability, high reliability, easy to use, and cheap, and the material is also very convenient. Twisted pair is the most commonly used transmission medium in the excavation or bending of a kind of integrated wiring project, which is composed of two copper wires with an insulating protective layer.
Two insulated copper wires are twisted together according to a certain density, and the radio waves radiated by each wire during transmission will be canceled by the radio waves emitted by the other wire, which can effectively reduce the degree of signal interference.
Twisted pair is generally made of two 22-26 insulated copper wires wound with each other, from which the name twisted pair comes from. In practice, twisted pair wires are made up of multiple pairs of twisted pairs wrapped together in an insulated cable sleeve.
In daily life, the "twisted pair cable chain" is directly called "twisted pair". Compared with other transmission media, twisted pair is limited in terms of transmission distance, channel width and data transmission speed, but it is relatively cheap.
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Anonymous users2024-02-061. There are two kinds of classification according to line order:
1. The direct connection line (suitable for computers and routers, dial-up modems, and switches) is white orange, orange, white-green, blue, white-blue, green, white-brown, and brown at both ends.
2. Cross-connect one end 568a and one head 568b (for computer and computer) 568a standard: green and white, green, orange white, blue, blue and white, orange, brown and white, brown and white 568b standard: orange white, orange, green and white, blue, blue and white, green, brown and white, brown.
2. There are two categories according to the classification of materials:
1. Shielded twisted pair.
The outer layer of the shielded twisted pair cable is wrapped by aluminum-platinum to reduce radiation, but it does not completely eliminate the radiation, and the shielded twisted pair** is relatively high, making it more difficult to install than unshielded twisted pair cables.
2. Unshielded twisted pair.
It is an ordinary twisted pair, which is divided into 4 pairs of twisted together by 8 wires of different colors, and the function of twisting in pairs is to reduce the impact of electromagnetic radiation and external electromagnetic interference as much as possible.
Category 4 twisted pair and Category 5 twisted pair.
Twisted pair and signal transmission through differential current, but with the increase of data volume, if the rate exceeds 100Mbps, the attenuation of twisted pair will become larger and larger, in other words, if you want to carry out data transmission of more than 1km of 500Mbps, twisted pair is not competent, and you must use optical fiber for communication; >>>More
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