The role of twisted pair core, the advantages and disadvantages of twisted pair

Varieties of twisted pair cables: Shielded cables: Category 5 4-pair 26AWG shielded cable, Category 5 4-pair 24AWG unshielded cable:

Category 7*: 1 pair of 19AWG unshielded cables Category 6: 4 pairs of 24AWG unshielded cables, 4 pairs of 23AWG unshielded cables, 25 pairs of 22AWG unshielded cables Category 5E:

4 pairs of AWG unshielded cables Category 5: 4 pairs of 24AWG cables, 4 pairs of 24AWG unshielded cables, 25 pairs of 24AWG unshielded cables Category 4: 4 pairs of 24AWG unshielded cables Category 3:

4 pairs of 24AWG unshielded cables, 25 pairs of 24AWG unshielded cables Category 2: Voice and low-speed transmission Category 1: Basic communication 3

Double body cable: 24AWG unshielded 4 4 pairs, 24AWG unshielded 4 4 pairs, 24 22AWG unshielded shielded AWG unshielded 2 2 pairs shielded cables: 1A, 6A, 9A.

Computer communication uses only four wires: 1, 3, 2, and 6.

Advantages and disadvantages of twisted pair friends to hold the pro! Hello, glad to answer for you. The advantages and disadvantages of twisted pair are as follows:

The advantage of twisted pair is excellent anti-electromagnetic interference: in long-distance cable transmission, the cable itself is a huge antenna, which will pick up the electromagnetic waves existing in the surrounding space, especially in the display system, this kind of interference signal shows uneliminated particle noise in the image display, the core of the optical fiber cable is glass, and the transmission is an optical signal, which is not easy to be interfered with by external electromagnetic waves. And then there's the small size:

Most fiber optics are as thick as a human hair. And very low attenuation: because optical fiber transmission is completed by a glass conduit, there is no large attenuation caused by cable resistance and capacitive reactance, and optical fiber greatly improves the bandwidth capacity and transmission distance of transmission.

There is also a high level of security in optical fiber: the signal content transmitted by optical fiber is not easy to eavesdropping. The disadvantage is the higher **:

Fiber optic cables, transmitters, and receivers are expensive, and there is a high level of labor: in the process of routing and wiring fiber optic cables, a lot of human resources and special tools are required. Although the transmission loss of optical signals in optical fibers is very low, the electro-optical and photoelectric conversion at the transmitter and receiver branches attenuates the signal very much.

Therefore, in order to ensure the transmission without insertion loss, it is necessary to add a high-gain multistage amplifier to the transmission, and also ensure that the circuit can work stably. Hope mine can help you! Do you have any other questions?

The details are as follows.

1.Long transmission distance and high transmission quality. Due to the advanced processing technology used in the twisted pair transceiver, the attenuation of the signal amplitude of the twisted pair ** and the attenuation difference between different frequencies are excellently compensated.

In addition, any pair of Category 5 unshielded twisted pair cables widely laid in buildings can be transmitted. 3.Strong anti-interference ability.

TwistedPair (TP) is the most commonly used transmission medium in integrated wiring engineering, 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 in the transmission will be canceled by the radio waves emitted by the other wire, effectively reducing the degree of signal interference. The twisted pair is generally made of two empty 22 26 insulated copper wires wound with each other, and the name "twisted pair" also comes from this.

In practice, twisted pair wires are made up of multiple pairs of twisted pairs wrapped together in an insulated cable sleeve. If one or more pairs of twisted pair wires are placed in an insulating sleeve, it becomes a twisted pair cable, but in daily life, "twisted pair cable" is generally called "twisted pair".

1. 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.