Development and application of communication cable

At present, wire and cable occupation is China's second largest occupation, its economic position is second only to the automobile occupation, and the supply rate of wire and cable occupation products exceeds 90% in domestic shopping malls. At present, China's total output value of wire and cable occupation has surpassed that of the United States, becoming the world's top producer. This is the continuous growth of China's economy for more than 30 years. The rapid spread of high-tech products has made the economic needs of the people progress, providing huge space for shopping malls for cable products, and the world is affected by the global financial turmoil in the world. The economic development of various countries has been affected, which has brought fierce temptation to China's cable shopping malls, and also promoted the world to focus on China's cable shopping malls, so that the production capacity of China's cable manufacturing industry has made the world look impressive. There are reasons to believe that the development and expansion of China's data communication industry will lead to a rapid increase in cable demand, and there is still huge potential for future cable industry. In China's shopping malls, the demand for various RF cables has increased dramatically in 3G construction. If the national 3G network is required to require at least 100,000 base stations, and whether it is a new base station or a shared base station, many RF coaxial cables are required. From the experience of 3G networks abroad, the operator's success condition is a network with complete coverage, 3G. Network coverage will also place a lot of demands on RF cables. However, the current demand for RF cables can be seen. The material of the RF cable is developed to "light into copper", which is an inevitable choice for communication cables in the future.




The status quo of communication cable development

Since the reform and opening up, China's information industry has been greatly developed. The use and popularization of television, mobile phones and computers have enabled China's various network systems to be continuously improved, and also promoted the broad space for the development of coaxial cable belts. At present, commonly used coaxial cables are divided into two categories: one type of coaxial cable is commonly used in CATV networks, so it is called CATV cable, which is currently used CATV cable. Another type of coaxial cable is primarily used for baseband signal transmission. It is primarily used in Ethernet. This type of coaxial cable has a maximum transmission interval of 185 meters and a cable length of up to 1000 meters. In signal transmission, such a cable can be conveniently used as a broadcast program for telephones, computer networks, televisions, and other electrical signals.

Classification and operation of communication cables

In the telecommunications industry, the communication cable is generally referred to as a cable for short-range audio communication and long-range high-frequency carrier and digital communication and signal transmission. It is one of the five major cable products of China's communication cable, and is used in the communication industry. The number is large. We divide them into six series according to the performance, use and application range of communication cables. They are six kinds of intra-city communication cables, long-distance symmetric cables, coaxial cables, submarine cables, fiber-optic cables, and RF cables.

The varieties of communication cables are:

(1) intra-city communication cable; (2) coal mine-specific communication cable; (3) shielded communication cable; (4) armored communication cable; (5) flame-retardant communication cable.

Symmetrical communication cable for digital transmission and application

The pre-detection method of the cable is the craft test, and the craft test is the most primitive method, but the test principle of all the conducters is from here. If the measurement is a wire, you can use the meter to output a weak test power from the "positive end" to one end of the line to be measured, measure the other end of the line to be connected to the "negative end" of the meter, and measure the line to be measured. Electrical characteristics. If it is to measure a bundle of wires, it is still a point-to-point test. The conduction cable and the megohmmeter are used to conduct the conduction test and the insulation resistance test respectively, and the operation task is heavy, and the error rate is relatively large. In the application of cable test skills, the current cable test skills are divided into two-line measurement and four-line measurement skills. The resistance value measured by the second-line test includes the resistance value of the adapter cable. When the resistance of the measured line is relatively large, the method can be used when the resistance value of the adapter cable can be ignored.

Cable test equipment is used for cable network testing, which can greatly improve the operating power in mass production. The most critical part of the test plan is the preparation of the pre-test, including the production of the adapter cable and the docking of the product and equipment. The uniqueness of the adapter cable address limits the applicability and scalability of the cable test. In order to make more useful advances in cable test power and reduce the time for preparatory work, the cable plug plug blind insertion concept is proposed to realize the cable test active addressing function. Insert the identification resistor or chip into the adapter plug, select the sensor matching principle, and input the test address into the database in the chip beforehand. After the tested cable and the test equipment are randomly connected, the test equipment will actively perform address matching. The test equipment will actively establish a correspondence between the test plug and the identification resistor, and the test device will actively change its physical address according to the implanted resistance or the internal database information of the chip to complete the matching operation of the address.




Coaxial communication cable

The inner and outer conductors of the insulated concentric inner core form a communication loop, and then are coaxially stranded. Such a coaxial cable can be used as a long-distance communication trunk, and can be used not only as a cable for multi-carrier communication or transmission of television programs, but also as a cable for data information transmission. Because the two conductors of the coaxial cable are concentric, they do not have the possibility of an electromagnetic field. Therefore, the degree of attenuation disturbance when transmitting a signal is small. The type of coaxial communication cable is distinguished by the size difference of the coaxial pair, and is a micro, small, medium and large coaxial cable. In the coaxial communication cable, its inner conductor is copper and its cross section is cylindrical.