The significance of the introduction of class six line standard

The significance of the introduction of class six standards

June 17, 2002, the United States Communications Industry Association formally adopted the six wiring standards, and in the appendix form of ansi/tia/eia-568b on June 24, the official printing and publishing, the standard officially named Ansi/tia/eia-568-b.2-1. Since August 1997, the first proposed six types of wiring specifications, after five years of contention, after a number of draft revisions, six types of wiring standards finally officially issued.
Six class cabling standards, not only ended the business in the product performance of the dispute situation, but also for users to choose six types of wiring products provide a reliable technical basis. To distinguish between the real six-class cabling system, as long as the system performance indicators to meet the six standards of all parameters of the requirements can be.

The focus of the five categories and six types of application disputes

Since the application of intelligent building technology in China, the controversy over the use of unshielded twisted pair in integrated wiring has never ceased. The first is the contention between the wiring supplier and the academia, wiring suppliers, including system integrators, new technologies, new products are more respected, on the one hand they want to make their own products or technology is always in the lead, in order to occupy as much market share, while the use of new technologies, new products will greatly improve system performance, Improve the reputation of the product or enterprise. And academia is more sensible, they consider more is the application of demand, not blindly respected new products. At the same time, there are two tendencies in the academic circle, some people think that at present, China's comprehensive national strength is not strong, in many areas of the network has not been so high application needs, so excessive investment is really a waste of resources. Among them, he is most concerned about the use of voice information points in the category of cable, because the analog phone in a long period of time far from the use of five types of cable bandwidth resources, not to mention more than five classes, six categories, so some people think that the integrated wiring will be the telephone integration is not necessary, but if a separate set of ordinary telephone lines, It's just not acceptable. To really solve this contradiction, I am afraid only the development of digital telephone technology (IP telephony), that is, the topic of the integration of multiple networks, but the integration of multiple networks has been mentioned for many years, real implementation, still to be a while.

Another part of people think that wiring technology has always been to develop, there is demand will have development, the national strength is not strong, does not mean anything to lag behind, conditional, demand users can completely track the latest technology, the use of the latest results. I also fully agree with this view. For the five categories, six types of wiring disputes, the author's view is: For a five-or five-type cable users, such as no network transformation and other special needs, let them eliminate the original five or five types of cable, rewiring six types of cable, to chase new technology, it is indeed unnecessary; for a new user, Whether to use a five-class cabling product or to use a six-class product depends entirely on the needs and decisions of the user. In the immediate case, the choice of six types of wiring, separate from the cost of wiring, compared to more than five kinds of 30%~40% about the cost, but the high bandwidth, High-performance returns. In June 2001, the American Association for Communications Industry (TIA/EIA-854), in response to the six draft, unveiled a full duplex gigabit Ethernet based on six-type balanced UTP, and recently Tia/eia is embarking on a new 1000base-tx alternative that, in the long run, With the release of six types of wiring standards, the introduction of new Ethernet transmission standard 1000BASE-TX, the gigabit network based on six-type cabling will become the new Gigabit Network application mainstream technology, so that copper gigabit to the desktop into the actual application. Although the five-type Gigabit Network application standard IEEE 802.3ab, or 1000BASE-T, was officially launched two years ago, the cost of expensive equipment has always hampered the use of gigabit networks based on the Super Five category, and so far it has not been applied much. According to market forecasts, based on the six-class Gigabit network card, active devices than the five-class cost of less than 30%, which to some extent also reduces the overall cost of the network. (Computer science)

Is it necessary to select six types of cabling?

In short, from the perspective of the development of integrated wiring technology, the introduction of six types of wiring standards has a very important significance, there is a demand for the market, there will be a market development. Six types of cabling standards, such as wiring the market a direction, so that product manufacturers, system integrators have a common technical standards, a fair competitive opportunity, so that users have a reliable choice of the basis, the market will eventually make a wise choice. As a product distributor or system integrator, only really stand on the user's position, dilute the "five categories, six categories" concept, from the user's actual needs, from the technical needs, for the user to design a reasonable network cabling scheme, in order to truly win the market. Therefore, to talk about six types of wiring is necessary, need to be treated differently, the author believes that with the popularization of gigabit applications, those who have high-speed data transmission needs of users, the choice of six have no worries, and completely necessary, in the long run, it should be wise choice, after all, the performance of the six-class system is far superior to the five categories, Super Five And for those network application demand is low, in a long time also will not have the network transformation demand, or to own application demand is not clear at all, at least at the present stage does not need to choose six kind of system. Super five wiring after several years of application verification, its good stability and cost-effective, won a lot of medium and low speed network requirements of the user's trust, so for them, at present not necessarily have to choose six types of systems, super Five classes may be their most rational choice.

Six types of cabling technology advantages

The new six-class wiring standards give the deepest impression is that the bandwidth from five classes, super Five class 100MHz to 250MHz, bandwidth resources to increase the 2.5 times times, for the future high-speed data transfer reserved a broad bandwidth resources. At the same time, the release of the standards to make up the deficiencies of the first few drafts, and to ensure that the system's backward compatibility and interoperability, that is, not only to accommodate the past three or five types of cabling system, but also to ensure the mixing between different manufacturers of products, changed the past six categories of products must be completely In addition, wiring performance indicators also have a greater degree of improvement, the higher requirements for attenuation, near-end crosstalk, integrated proximal crosstalk, equivalent distal crosstalk, synthetic equivalent distal crosstalk and echo loss are put forward, so the performance of cabling system is much better than that of super five type wiring.

New transmission standards support, but also for the promotion of six types of cabling provides a strong technical support. Compared with the Gigabit Ethernet standard 1000BASE-T based on Super Five class system, the draft specification for six kinds of cabling has a higher technical advantage than 1000BASE-TX. 1000base-t to 62.5MHz for the transmission frequency, the use of 4 lines of Full-duplex transmission signal, so both ends of the equipment (network adapters, switches) must be designed 4 transceiver, resulting in increased equipment costs, and even the high price of gigabit equipment. And 1000BASE-TX can be designed to use two lines to complete One direction of one-way signal transmission, the other two lines to complete the opposite direction of the signal transmission, that is, two wire pairs used to send data, the other two line pairs for receiving data, that is, half duplex operation, so the device end only need two transceivers, So it is expected that the 1000BASE-TX network card is lower 30%~40% than the 1000base-t.

Judging from the direct cost of wiring, at present, six types of wiring than the Super five Class A lot, but the cost savings in the equipment, the overall cost of the system, so the comprehensive cost is not high, coupled with the advantages of performance indicators, six types of wiring into the future gigabit application of the mainstream cabling technology, should be around the corner.

is not the end of copper wiring

Six types of cabling standards for the introduction of unshielded twisted pair, it seems to have come to an end. In the six standard, the definition of copper media type also has UTP and SCTP, but in the current discussion of the seven categories, there is no UTP figure. With the increase of wiring bandwidth and transmission performance, the production of cable and the construction of the later stage have increased the difficulty, moreover, the anti-interference ability of the unshielded twisted pair is limited, crosstalk is the primary factor hindering the development of the unshielded twisted pair, so the design and construction of the six kinds of wiring, especially emphasizing the wiring design and the technical standardization of construction. However, the development of copper cabling technology will not be stagnant, now can not be achieved does not mean that the future can not be achieved, unshielded balanced twisted-pair, and shielded twisted-pair of resources available. For a long time, the unshielded twisted pair has occupied the main share of the wiring market, so the advantage of shielding twisted pair has not been fully applied and developed. The introduction of the six standards, indicating that the seven standard can be, as long as the application of the demand, will promote the development of the corresponding technology. I believe that six types of wiring standards is not the end of copper cabling technology, copper cable wiring technology has a long way to go.