Current Location:Electronic Cable Overview of the main species
Click:4074Time:2013-10-29 10:09:28
Electronic Cable Overview of the main species
With the increasing number of electronic appliances, to work in people's lives bring great convenience. This is one of the electronic media connection cable, electronic cable plays an important medium. This article is reproduced from [South cable network]
To meet the rapid growth of Internet users and network services to the needs of the development of high-speed ﹑ multimedia, information communication network is to keep the direction of high-speed large-capacity ﹑ rapid development of electronic cable network infrastructure as an essential information transmission medium, one mustmeet the development needs of the global information industry to a wider frequency band higher speed ﹑ ﹑ better quality to meet new business needs.
Looking below the main varieties of today's electronic cable overview of the development
1, mobile communications with the RF cable
Mobile telecommunications industry is currently the fastest growing areas. Mobile subscribers worldwide surge year after year, the end of 1999 a total of 487 million users at end-2000 and up to 700 million, annual growth rate of 44%, up to 1.3 billion in 2005.
As mobile communications to meet the modern "5W" communication requirements (ie, whoever whenever ﹑ ﹑ ﹑ wherever whomever & whatever, with any person in any place at any time with anyone ﹑ any form of communication), is increasingly preferred by people . Advanced countries such as Japan, the number of mobile subscribers reached 56.9 million, more than 55.5 million fixed telephone subscribers, walking in the forefront of this trend. If the calculated penetration by population, Iceland is as high as 77.4%, has exceeded the original leader of Finland (65.l%). China's mobile communications field is gradually increased capital investment, development speed is very impressive, to July 2001 total to 120.6 million, exceeding the 120.1 million U.S., ranking first in the world, 2005 is expected to reach 290 million. However, at present the vast majority of mobile users in China's GSM users, is the second-generation mobile communications (2G), while the present world development trend for the third-generation (3G) and even fourth generation (4G) mobile communications, to meet the future mobile multimedia communications and mobile Internet development needs. To meet the needs of this new development this year, China Unicom's CDMA network construction has been substantially activated, in the next three years to invest about $ 8.5 billion in 2005 owns 60 million CDMA users to keep up with new developments in mobile communications historical trend.
Mobile communication base station system, mobile network infrastructure is a major sector of the investment costs are around 70% of the entire network investment, with a great market. As a base station feeder, the latest generation of the physical foaming insulation products are copper outer conductor ﹑ wrinkles RF cable, and its market prospects are very bright. Currently, the mainstream of the RF cable has a complete range of products, including 1 / 4 ﹑ 3 / 8 ﹑ l / 2 ﹑ 5 / 8, 7 / 8 ﹑ l (l / 4), l (5 / 8) and 2 (1 / 4) and other kinds of products, and 1 / 4 ﹑ 3 / 8 ﹑ 1 / 2, 7 / 8 chip size of ultra-soft jumper products, fully meet the kinds of mobile communication base station equipment requirements.
The latest developments in this area is the use of high-temperature flame-retardant insulation products, and LMR like Soft feeder cable. Feeder high flame retardant to meet the high safety requirements. Abroad, has developed the use of microporous insulation around the package with four fluorine, and the use of newer low-density PTFE insulation pushing the corresponding feeder products. The LMR-type feeder is the use of self-adhesive plastic film and tin-plated copper braid longitudinally more flexible structure, can greatly reduce costs, and direct feed to the antenna, no jumpers, more convenient to use .
2, twisted pair cable
Twisted pair cable (Twisted Pair Cable) is the traditional media, then an ordinary letter, the most widely used, is the main body of the telecommunications access network. Worldwide, twisted pair cable access as high as 94% of its communications business is to develop in the direction of non-voice services. Modem high-speed Internet access, the rate of up to 56kb / s, the use of Personal Emergency ISDN access the Internet, the rate further increased to 128kb / s, while the use of newer ADSL mode; the downlink rate of 1.5-8Mb / s, as a new generation of home networkingapplication methods, the use of telephone twisted pair of Home PAN rate is also up to l-10Mb / s. Therefore, the current use of twisted pair cable has become a wide variety of broadband access to the new complex ways, and are increasingly common. The new generation of digital communication twisted pair cables available, including UTP STP ﹑ ﹑ ﹑ FTP SSTP products, the rate of broadband access to a new height. Is vigorously promoting the FTTP + LAN mode fiber optic cable to the House, The five cable households, the rate of up to 150Mb / s, is unmatched by other means. The Intranet (internal network) to further enhance the development of broadband access speeds. In some advanced intelligent building cabling system applications, and the U.S. military LAN applications, five cable no longer meet the requirements, the cable must be used for more than five higher grade.
The United States and Canada for the use of the data cable of a higher security requirements, according to the National Fire Protection Association (NFPA) requirements, data communication cables into the building must meet the safety requirements, including the highest level of MPP ﹑ CMP, which Plenum Cable (plenum cable), should meet the test requirements of UL-910 flame retardant low smoke ﹑ and other special requirements, this cable must be insulated and Flamarrest EEP media like high-flame-retardant PVC jacket, to prevent the building Fire damage is very beneficial. Other categories Table 2 cable as Non-plenum Cable, the flame retardant requirements decreased. At present, five cable laying most of these products, their safety remains to be further improved.
Cable diameter should be less than 1 / 4 feet (6.35mm), MPP for the multi-layer non-flower panels A cable, CMP layer to the ceiling with communication cable, MP for the multi-purpose cable, CM for the communications cable, CMX to restrict the use of CM cable.
3, CATV cable
CATV cable since the 1940s in the United States since the advent of very rapid development, 96 percent of households a CATV cable laying. CATV industry in China since the 1980s has developed more rapidly, the end of 2000 reached 90 million users, ranking first in the world, but only 28% penetration rate, there is considerable room for development. In particular it should be noted that the vast majority of China's CATV system is a one-way system, bi-directional transformation just beginning.
Shanghai in the country's leading two-way CATV renovation project, access to broadband capacity has reached 1 million users, Internet speed up to 10Mb / s, the traditional two-way interactive broadcast network into a multi-faceted service platform, in addition to transmitting television greatly improved the quality of the program, can be adapted to future high-definition digital TV, but also provide inexpensive high-speed Internet service ﹑ so ﹑ TV, voice data "triple play" from the vision into reality. Shanghai's nearly 2 / 3 of the CATV two-way users will further transformation, which for ordinary home users broadband access to the best way. As each country will increase the number of CATV users 500-1000 million, plus a comprehensive two-way transformation carried out for the CATV cable to open up a very good prospect.
To meet the two-way HFC CATV network networking group group-building needs, CATV cable industry should further improve the quality, in particular, should vigorously promote the four-shielded cable, which uses double-sided plastic film longitudinally (self-adhesive type) ﹑ double-sided aluminum wire woven ﹑ ﹑ longitudinally braided wire outer conductor structure to shield attenuation pointer to 110-120dB, thus greatly improving the two-way CATV system upstream channel transmission quality.
4, Conclusion
With the advent of the new century information society, e-businesses increasingly common, e-commerce E-Commerce), Electronic Education (E-Learning), electronic home (E-Home) and other new thing after another, as the electronic cable application to open up a broader space for development.
