Research on six kinds of cabling in gigabit network

As we all know, Ethernet technology is closely related to cabling technology, so how does gigabit Ethernet technology develop to support a new generation of cables, especially the six types of cable in the protocol?
　　
Gigabit network need six kinds of wiring?
Wiring industry at present the need for six types of wiring is a lot of controversy, remember when the 1992 three types of wiring is prevalent, and five types of wiring only just proposed, the Low-cost 10Mbps is to run Ethernet (10BASE-T) and 25MbpsATM LAN and in three types of cabling based on the development. When the bit rate of Ethernet increases to 155.5Mbps of 100MBPS,ATM LAN, in order to support these LAN technologies on the basis of three kinds of cabling, electronic equipment has to improve its complexity and cost. 100BASE-T4, 100BASE-T2 and 155.5MBPSCAP64ATM LAN require the use of complex DSP technology to overcome the limitations of three types of cabling. With five types of cabling being adopted by many end users, inexpensive 100Mbps (100BASE-TX) Ethernet and 155.5MbpsNRZATM LANs have been developed and better performance has been achieved on the basis of five types of cabling.
　　
The actual situation shows that: the full cost of each user's connection when running 100BASE-T4 with three kinds of wiring (for example, from router to network card, including cable) is 246 dollars, and the 100base-tx of five kinds of cabling is 198 dollars, in contrast, Average per-user connection cost savings of 24%.
　　
There is no doubt that the same development will happen again in 1000base-t LAN technology, because the 1000BASE-TX design uses two pair of wire to send, two to receive the work way, therefore does not need the full duplex mode the echo cancellation. In order to shorten the time to enter the market, will choose the MLT-3 encoding method used by 100BASE-TX, MLT-3 bandwidth efficiency of 4 bits per hertz, so the frequency width is 125MHz. This is a good way to limit six types of cabling to next and Psnext, so crosstalk cancellation is unnecessary. The current level of semiconductor technology does not use the back-ripple crosstalk cancellation device will reduce at least 50% of the overall complexity of the 1000BASE-TX design (compared with the current 1000base-t design).
　　
By extension, this design can be used for 1.2Gbps systems if the data ratio is raised from 500Mbps to 600Mbps per pair. As a result, class six cabling will not only reduce the cost of electronic devices that support gigabit Ethernet, but also provide infrastructure protection for future LAN technologies that may exceed 1Gbps. (Computer science)
　　
Cabling infrastructure investments will be considered a long-term investment, and wiring facilities themselves should also be an asset. According to the international wiring standard ISO11801, the life expectancy of a wiring system is at least 10 years. During this time, PC technology will make great progress. For now, although the desktop system has not yet used 1Gbps requirements, this is mainly due to the current PC internal bus structure constraints, because the bus determines the processor and memory and other peripheral devices (such as network card) between the rate of data exchange. The famous Moore's Law predicts that the number of transistors on the chip increases by one times every 18 months. This is often used to describe the growth rate of PC processor performance, that is, the performance of PCs will be increased by one times every 18 months. So, in the life cycle of the cabling system, it is very possible for the 1000BASE-TX technology to be applied to the desktop system.
　　
How Gigabit network wiring
Comprehensive Cabling system design is the basis for the success of the security system, designers in fully understand the end-user computer network and business applications on the basis of the overall cabling system for the general framework of planning, so as to design a reflection of the user's actual needs of the integrated wiring system diagram. In architectural design, we must take into account the direction and space of the pipe groove of the integrated wiring system. Weak current and weak position, the weak current system design should be for the computer mainframe room, telephone exchange room to set aside enough space, the number of information points and location of the business departments should be discussed with the end users.
　　
In addition, in accordance with the requirements of the transmission rate, bandwidth and application software of the computer network, the design of the integrated wiring system shall provide for the grade and specification of the integrated wiring system products (cables, connectors) according to the standard of the international and the European and American Cabling System, and also consider the requirements of the user environment for the Consider whether the use of flame-retardant, non-toxic and shielding products. At present, most of the integrated wiring system projects used in Europe and the United States well-known wiring brand company's products. The choice of cabling system products should mainly consider whether the use of wiring products to meet the international and Europe and the United States integrated wiring system standards to meet the computer network and business applications to the integrated wiring system requirements. The user and the designer may inspect and inspect the products and suppliers according to the actual needs.
　　
The implementation of the integrated wiring system is the key to realize the system design requirements, at the same time, in the entire user's construction and weak system implementation process, the integrated wiring system construction entered the earliest, the end of the latest, and construction, strong electricity and other weak current system coordination and cooperation of the most, therefore, The construction team of the integrated wiring system must have the corresponding construction qualification, the construction personnel should have the good quality. At the same time, project management personnel must plan, supervise and instruct all aspects of the construction of the integrated wiring system to ensure that the integrated wiring system is completed in time and according to the design requirements.
　　
In project management, should be the following projects often encountered in the attention: first, the integrated wiring system design drawings, building installation drawings and precision decoration drawings are consistent, if the design of the blueprint update can not be released to the system in time, it will occur the system coordination problems, resulting in the project rework, resulting in increased costs, delay duration. Second, the design changes affect the project progress and cost budget, any project, encountered changes are unavoidable, but make changes must be prudent, and must follow the normal processing procedures. At the same time, the progress of each system, on-site coordination and product arrival, storage and system on-site protection issues can not be ignored.