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Looking Electronic Cable Latest Developments
Posted by www.china-cable.net on 9/1/2008Now the society is entering the new times which the informationization develops highly, the knowledge economy as well as the information technology rapidly expand, advanced the information infrastructural facilities new tide greatly, the network has become the irresistible development mainstream, the message communication network construction already to the globalization, the family, the personalized direction swift development, specially Internet's astonishing development, caused it to become electronic, the communication industry biggest propelling force. The Internet takes the fourth media which appears most newly (publication, broadcast, television and the Internet), penetrated day by day into now the society each field of activity, the surfer browsing, the exchange of information, email receiving and dispatching, on-line IP telephone, the distance learning, on-line MP3 music, on-line entertainment, on-line work as well as electronic commerce and so on advanced communication service is day by day common, the development is rapid. Our country Internet development speed is quicker, has started since 1994, the web cam counts every year approximately by 400% speed growth, has achieved to 1997 620,000. at the end of June, 2001 has reached 26,500,000 people, estimated that in 2005 will reach 240,000,000, this means that China will become in the world the biggest network market. In order to adapt the web cam explosive growth as well as the network service to high speed, the multimedia development demands, the message communication network to high speed, the large capacity direction leap is developing unceasingly, the electronic line cable takes one of information network infrastructure essential transmission media, must adapt the global information industries development demand, by a wider frequency band, a higher speed, a more superior quality satisfies each kind of new service the demand.
1st, Paired Cables
The paired cables (Twisted Pair Cable) is traditional words Pu corresponds the medium, the use is most widespread, is the current telecommunication access network's main body. Globally, reaches as high as 94% to the stranded wire cable turning on proportion, its communication service is developing to the non-voice feature direction. Uses the high speed Modem surfer, its speed may reach 56kb/s, uses one to pass the ISDN way surfer, the speed further rises 128kb/s, but uses the ADSL way which renews; Its downward speed is 1.5-8Mb/s, takes the new generation family network application way, speed may also reach l-10Mb/s using telephone twisted pair line's Home the PAN. Therefore, has formed the type numerous and diverse each broadband access new way at present using the paired cables, and day by day universal. But new generation digital communication paired cables' being published, including UTP, FTP, STP, the SSTP serial products, pushes to broadband access's speed the new altitude. Presently is promoting vigorously the FTTP+LAN way, uses the fiber optics to the building, five kind of electric cables to arrive at the household, its speed may reach 150Mb/s, is other ways is unable to compare. But Intranet (intranet) the development has further promoted the broadband access speed. In some advanced intelligent building synthesis wiring system application as well as the American Military's LAN application, five kind of electric cables no longer satisfy request, must use above five kind of electric cable's high-grades.
Countries and so on US and Canada proposed to the above data electric cable's operational safety higher request, according to the entire US Fire protection Association (NFPA) the stipulation, enters the building the data communication electric cable to satisfy the safety requirements, MPP, CMP are the highest ranks, namely Plenum Cable (ceiling insulation electric cable), should satisfy the UL-910 experiment stipulation being flame-resistant, the low smoke introduction and so on special request, this kind of electric cable must use the EEP medium insulation as well as Flamarrest and so on is flame-resistant the PVC protective covering high, regarding prevents the building flame the injury to be very advantageous. Table 2 other category electric cables are called non-plenum cable, its being flame-resistant request has reduces. At present the domestic placing's five kind of electric cables for this kind of product, its security still waited for further improving mostly.
The electric cable diameter should be smaller than 1/4 inch (6.35mm), MPP is multipurpose does not have the top board Arab League level electric cable, CMP is the ceiling with the level communications cable, MP is the multipurpose electric cable, CM is the communications cable, CMX is the limit use CM cable.
2nd, the Mobile Communication Uses Radio Frequency Electric Cable
Because the mobile communication can satisfy the modernization “5W” the correspondence request (i.e. whoever, wherever, whenever, whomever & whatever, anybody may, any place carry on any form at any time with anybody correspondence), is receiving people's being partial to day by day. World advanced countries, if Japan, its motion number of users has reached 56,900,000, has surpassed the fixed-line telephone user 55,500,000, walks in this development tidal current most front row. If according to the population popular rate computation, Iceland reaches as high as 77.4%, has surpassed originally leading Finland (65.l%). Our country mobile communication domain is increasing the funding invested dynamics gradually, the development speed is very astonishing, user total achieved to July, 2001 120,600,000, surpassed the US 120,100,000, leapt to the world first, estimated that in 2005 may amount to 290,000,000 households. But, our country's overwhelming majority mobile subscribers are the GSM users at present, belongs to the second generation of mobile communication (2G), but the world development tidal current for the third generation (3G) even the fourth generation (4G) the mobile communication, can satisfy now moves the multimedia correspondences from now on as well as moves Internet's development demand. In order to meet this recent development need, this year Our country Link Company substantive started the CDMA network construction, will plan invests approximately 8,500,000,000 US dollars in the next three years, supports to 2005 with 60,000,000 CDMA users, will catch up with the mobile communication recent development the historical trend.
The mobile communication base-station system is moves the network infrastructure the Primary sector, its investment expenses approximately compose the entire network investment 70%, has the enormous market. As the base depot feed line, the most new generation product is physics becomes spongy the insulation, the wrinkle copper outer conductor radio frequency electric cable, its market application prospect is very bright. At present, this radio frequency electric cable's mainstream product has formed the complete series, including 1/4, 3/8, l/2, 5/8, 7/8, l (l/4), l (5/8) and 2 (1/4) and so on many kinds of specification products, as well as 1/4, 3/8, 1/2, 7/8 plan the specification ultra supple flexible jumper product, but full prepares satisfiedly plants the mobile communication base depot the operation requirements. Is uses the high temperature insulation material in this domain's most recent development the being flame-resistant product, as well as LMR and so on soft feeder cable. The high being flame-resistant feed line may satisfy the security aspect the high request. Overseas has developed uses the pore fluorine four belts to circle a package of insulation, as well as uses the renewal low density polytetrafluoro second grade to push the insulation thinly the corresponding feed line product. But the LMR feed line is uses from sticks the aluminum to model the thin film vertical package and a tinned wire knitting softer structure, may reduce the cost greatly, and may the direct feed arrive at the antenna, does not need to jump the line, the use is more convenient.
3rd, CATV Electric Cable
CATV electric cable since the 1940s has been published in the US, the development is very rapid, 96% families have laid the CATV electric cable. Our country CATV enterprise has developed since the 1980s is more rapid, has reached 90,000,000 users by the end of 2000, leaps to the world first, but the popular rate is only 28%, Shang You very big development leeway. What should point out specially, our country CATV system overwhelming majority is the one-way system, the bidirectional transformation also just started.
In the national leading Shanghai CATV bidirectional improvement project, wideband user turning on ability has amounted to 1,000,000 households, the surfer speed may reach 10Mb/s, causes traditional the broadcast television network to turn bidirectional interactive the multi-positions to serve the platform, besides the transmission television program's quality is the enhancement greatly, may adapt from now on the high definition digital television, but can also provide high speed, the moderately-priced surfer service, causes the television, the pronunciation, the data “three net fusions” from to become the reality ideally. The entire Shanghai will also have nearly 2/3 CATV user also to further implement the bidirectional transformation, thus has provided the most ideal wide band mode of entry for the ordinary family user. Because the national CATV number of users will increase progressively every year 500 - 10,000,000 households, in addition the bidirectional transformation's comprehensive development, was the CATV electric cable opened the very good application prospect.
In order to satisfy bidirectional HFC the network way CATV network construction the demand, the CATV electric cable industry should further improve the quality, specially should promote four shielded cables vigorously, namely uses the two-sided aluminum to model the thin film vertical package (from to stick), the wire knitting, the two-sided aluminum to model the vertical package, the wire knitting outer conductor structure, makes the shielding attenuation target to enhance 110-120dB, thus improves the bidirectional CATV system upward channel's transmission quality greatly.
4th, Concluding Remark
Along with new century information society's oncoming, various trades and occupations' computerization is day by day common, electronic commerce (E-Commerce), the electronic education (E-Learning), the electronic household (E-Home) and so on new thing emerges one after another incessantly, opened the broader development opportunities for the electronic line cable's application.
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