Introduction of the significance of six standard
June 17, 2002, the United States formally adopted the Telecommunications Industry Association, six types of cabling standards, and to ANSI/TIA/EIA-568B Appendix form June 24 official printing and publishing, the official name of the standard ANSI / TIA / EIA -568-B.2-1. Since August 1997 cabling standard was first proposed six years, after five years of struggle, after repeated revision of the draft, six types of cabling standard was finally issued.
The introduction of six types of cabling standards, not just an end product performance, business disputes at the situation, but also for the user to select six types of cabling products provide a reliable technical basis. To distinguish between the real six cabling system, as long as the test system, whether the six types of performance standards required of all parameters can be provided.
Five, six types of applications the focus of controversy
Since the promotion of building technology applications in China since the cabling in the use of unshielded twisted pair type of argument has been stopped. First, suppliers and academia wiring point of view of the war, cabling providers, including system integrators, the new technology, new products are more respected on the one hand they want their product or technology has a leading position to capture as much as possible and more market share, while the new technology, new product use, will greatly improve system performance, improve product or business reputation. The academic community is even more reason and to apply them to consider more of a demand, not blindly praise new. Meanwhile, there are two tendencies within academic circles, some people think that our country's comprehensive national strength is not strong, in more areas of the network applications do not demand so high, so high investment is a waste of resources. Among them, he is most concerned about voice messages point to use the type of cable, because analog phone for a long period of time not much use five types of cable bandwidth, not to mention over five, six, and it was felt that comprehensive integrated into the telephone wiring is not necessary, but if you laid a single ordinary telephone line, it is unacceptable. To truly solve this contradiction, I am afraid only other digital telephony (IP Phone) development, and that is the topic of multi-play, but the multiple networks-one has mentioned that several years to implement it genuinely take some time before .
While others believe that technology is always the wiring to move forward, there is a demand there will be the development of national strength is not strong, does not mean that something must be backward, conditions and requirements of users can track the latest technology, the latest results . I also fully agree with this view. For five, six types of wiring the controversy, the author of view is: If someone has laid a five or over five cable users, such as no network transformation, and other special needs, let them out of the original five or super- five cables, six cable re-wiring, to pursue new technology, really is not necessary; while a new user, is the use of ultra-five wiring products or use of six types of products depends entirely on the needs of users and decision-making. In the short run, select the six wiring, separate from the wiring cost considerations, and more than 30% over five to 40% of the cost, but high bandwidth, high performance returns. June 2001, the U.S. Telecommunications Industry Association was six against the draft, published six categories based on full-duplex Gigabit Ethernet twisted-pair balanced draft TIA/EIA-854, a recent TIA / EIA is working to launch a new The 1000BASE-TX alternatives in the long run, with the release of six types of cabling standards, the new transmission standard for 1000BASE-TX Ethernet, the introduction of Gigabit network based on six types of cabling will be the new Gigabit network Application of mainstream technology, so that copper Gigabit to the desktop into the application. Although officially launched two years ago for the super-five cable network using standard Gigabit IEEE 802.3ab, or 1000BASE-T, but the high equipment costs, has prevented over five gigabit network-based applications, so it has to pay various applications, not much. According to market forecasts, based on six categories of Gigabit Ethernet, active equipment, lower cost than the super-five of about 30%, which to some extent, reduce the overall cost of the network.
Select six wiring necessary?
In short, integrated wiring technology from the point of view, the introduction of six types of cabling standards has an extremely important, there is no market demand, the market can bring about development. The introduction of six types of cabling standards, cabling market in one direction like a standard, so that manufacturers, systems integrators with a common technical standards, a fair opportunity to compete, allowing users to have a credible option basis, the market ultimately will make a wise choice. As the product distributors or system integrators, only genuine customer side, the play down "five, six" concept, from the user's actual needs, from the technical needs, the user programs a reasonable network cabling can win the market. Thus, to talk about whether the six types of cabling necessary, require separate treatment, I believe that with the popularity of gigabit applications, those with high-speed data transmission needs of users, select the six no longer worry about, but absolutely necessary, In the long run, should also be a wise choice, after all six types of system performance is much better than five, super-five; and lower demand for those network applications, in the longer period would not be demand for network transformation , or on their own applications do not clear at this stage do not need to select at least six types of systems. After over five years of the application layout verification, its good stability and cost-effective, win a lot of low speed network needs the trust of customers, so for them, in the present do not have to select the six types of systems, ultra-5 class may be their most rational choice.
Six types of cabling technology advantages
Introduction of six new impression on cabling standards, the bandwidth of the five categories, five of the 100MHz ultra up to 250MHz, bandwidth about 2.5 times increase for future high-speed data transmission bandwidth resources reserved for a broad. At the same time the release of the draft standard to make up for the first few deficiencies and to ensure system compatibility and downward compatibility of, that not only inclusive of the previous three, five types of wiring systems, and ensure the products between different manufacturers mix has changed in the past six product must be in full uniform of the state. In addition, the cabling performance has also been greatly enhanced, to the attenuation, near-end crosstalk, integrated near-end crosstalk, equivalent to far-end crosstalk, integrated remote equivalent crosstalk, return loss and other indicators of the higher demand which has been in the cabling system performance much better than the super-five wiring.
The new transmission standards support for the promotion of six wiring provided strong technical support. Systems based on ultra-five 1000BASE-T Gigabit Ethernet standard than the draft specification for the six wiring 1000BASE-TX have a higher technical advantages. 1000BASE-T to 62.5MHz for the transmission frequency, using the four wire full duplex transmission on the signal, so both ends of the device (NIC, switches) to 4 transceivers were designed, resulting in increased equipment costs, equipment prices as well as Gigabit high. The 1000BASE-TX can be designed to be completed with two lines in one direction on one-way signal transmission, the other two lines on the complete opposite direction of signal transmission, that the two lines used for sending data, the other two lines used for receiving data, which is half duplex operation, therefore, only two transceiver device side, it is expected 1000BASE-TX 1000BASE-T network card than a 30% to 40%.
View from the direct cost of wiring, cabling than the current six over five much higher, but the cost savings in the budget end equipment will be shared with low overall system cost, the overall cost is not high, together with performance indicators advantage, six Gigabit cabling and become a mainstream application routing technology, it should be just around the corner.
Copper wiring is not the end of
Six types of cabling standards has, for unshielded twisted pair speaking, seems to have come to an end. In the six standard, defined media types are copper UTP and SCTP, but about seven in the current class has no UTP figure. With the cabling bandwidth, transmission performance improvement of the production and Hou Qi of the cable construction are more difficult, and unshielded twisted pair of anti-interference ability is limited, and the crosstalk is hindered unshielded twisted pair to continue to develop the primary factor, so six types of wiring design and construction, with particular emphasis on layout design and construction of technical norms. But the copper wiring technology will not be stagnant, can not now realize does not mean the future can not be achieved, unshielded twisted pair can achieve a balanced, shielded twisted pair resources are available. Long, unshielded twisted pair cabling has been dominated by the major share of the market, so the advantages of shielded twisted pair has not been fully applied and developed. The introduction of six criteria, indicates seven types of standard can be expected, given the application needs, it will promote the development of appropriate technology. I believe that the six types of cabling standard copper cabling technology is by no means the end of copper cabling technology is still a long way to go.