Data cable

With the high-speed development of optical communication technology, the cable network backbone and interoffice trunk line has been widely used optical cable, optical fiber into access network has become an inevitable trend.
But the high cost of optical cable laying, connectors and terminal optical - electrical conversion cost expensive, therefore, for a long time before the packtized popularization, access network user line will continue to give priority to with metal wire. Including all plastic metal cable cable, coaxial cable and data cable. Among them, the data cable is the ideal of broadband access network transmission media, it has low manufacturing cost, simple structure, good scalability, facilitate the advantages of the network upgrades, it is mainly used for building integrated wiring, computer integrated wiring, etc.
Data cable so far, there are two kinds of cable: one is Americas 100Ω cable, mainly for the non-shielded cable; The other is European 150Ω cable, mainly for shielded cable.

International standards generally fall into three categories, four, five, five, six, enhance sexual respectively corresponding to the transmission bandwidth of 16MHZ, 20MHZ, 100MHZ, 100MHZ (support full-duplex transmission), 250MHZ, with seven, eight even now there is no formal definition on the international standard, just of the hype of cabling manufacturer; Levels corresponding to different data cable has the symmetry of the corresponding channel level and, general component is currently CLASS A and CLASS B, CLASS C, CLASS D, CLASS E level, of course and there have been pushed CLASS F grade now. Actually two different areas on different impedance requirement of cable is different based on their structure, generated by the America of 100Ω cable, mainly America so far are not pushing block structure, this is because if the shielding structure can form between the conductor and shield near effect, low frequency parameters, such as change of capacitance and resistance, the other on the shield will have high frequency litter of spin current is generated. But don't block structure, cable, there is no resistance to interference ability and confidentiality is poor, and if you want to do it as more than 300MHZ transmission is difficult, so Europe is implemented block structure, so how to eliminate from the worries of the shield, had to increase through impedance, so Europe is in commonly 150Ω cable. Two structures who good who bad will decide that according to the different application environment, so now the international wiring are generally pay attention to the combination of the two kinds of wiring way. Wide application but it is not shielded structure, and the result of the development of information technology, to follow up the transmission bandwidth requirement, at present more popular is five classes and increase sexual five categories of data cable shielding.