Fluke: promulgation of six standards and Application of networks

The standard for the formal test of cat6 cabling was officially released on April 9, June 20, 2002. The standard number is ANSI/TIA/EIA568B. The European ISO standards are coming soon. Many network users may ask whether the formal promulgation of the six standards means that the six systems will become popular immediately. What is the relationship between the six systems and the network applications? What is the actual meaning of the six types of systems.

Computer Networks are network-based transmission media. Currently, the most popular LAN is Ethernet, except for optical cables or twisted pair wires ). The relationship between network media and network technology is very similar to that between automobiles and highways. With the increase of automobiles and the speed of automobiles, high-grade highways, such as highways, need to be built, the development of roads will promote the development of automobiles. For networks, Faster network technologies require a wider network medium, while wider network media bandwidth will promote the development of high-speed networks.

It makes a lot of sense that almost all six standards have been published, and the 10-Gigabit Ethernet (10 Gpbs) network standards have also been officially released. 10G Ethernet is a network that only runs on optical fiber. Mainly used for LAN campus networks) and man. As the backbone improves the speed, the possibility of 1-gigabit access to the desktop will become larger and larger, and the network speed will be improved to better support video and multimedia applications in the LAN.

Gigabit Ethernet technology and network media twisted pair wires are mutually reinforcing but restricting each other. Currently, Gigabit Ethernet based on Copper Twisted Pair wires has two standards: 1000Base-T and 1000Base-Tx.

1000Base-T is a network based on four pairs of twisted pair wires that run bidirectional transmission on each pair of lines in full duplex. This technology uses a complex and more efficient coding technology, and its bandwidth is not equal to the transmission rate) is 100 MHz. This is also the starting point of the technology, that is, the hope that the network technology can run on five categories of lines. Because the four-to-one line performs bidirectional transmission at the same time, the crosstalk between the line pairs is serious, and the more efficient coding technology requires better signal-to-noise ratio. Therefore, this technology requires NICs and network device interfaces, such as switches or hubs, to ensure that the network can receive signals normally. In this way, the network port access fee is increased (special receiving circuit design), and The 1000Based-T network is in the cat5e or better-performing cat5e system (pass the TSB95 standard certification test) can run. 1.

1000Base-Tx is also based on four pairs of twisted pair wires, but is sent on two pairs of lines, two pairs of lines receive (similar to 100Base-Tx ). Since each pair of cables does not carry out bidirectional transmission, the crosstalk between cables is greatly reduced, and the encoding method is relatively simple. This technology has low requirements on network interfaces and does not require complex circuit design, reducing the cost of network interfaces. However, because the efficiency of cables is reduced (two-to-one and two-to-wire transmission), to reach a transmission rate of 1000 Mbps, the bandwidth must exceed 100 MHz, that is to say, networks of the 5th and 5th categories cannot be supported. It must be supported by six types of systems, 2.

To sum up, 1000Based-T can run on cat5e or high-performance cat5e systems, but the cost of network interfaces is relatively high. 1000Based-Tx can only run on six types of systems, but its network interface cost is low. So how should we choose? What kind of network technology will pop up is determined by a variety of factors, among which the price and its wide application are very important factors. Relatively cheap technologies will become more popular, and the more popular the technology, the lower the product price. For twisted pair Ethernet, the price is calculated based on the price of each link. It includes two parts: the price of the cable link and Its Connector) and the price of the network device interface switch or HUB, nic ). For example, if the cable price for a link is 400 yuan and does not cover the construction cost), the price of a 12-port switch is assumed to be 12000 yuan, and the price of each port is 1200 yuan, the total price of such a link is 1600 yuan. For 1000Base-T, the cable link price is low, but the network interface price is very high. The Network Interface price of 1000Base-Tx is relatively low (the specific price is unknown, but it is expected to be lower than 1000Base-T). However, the cable link price is relatively high because of the support of the six types of systems.

Currently, applications from Gigabit to desktop are not common. One of the reasons is that there is no clear direction. It is still unknown which technology will become the mainstream in the future, this leads to the problem of having a chicken or an egg.

Currently, the cat6 cabling standard has been officially released. The first product called cat6 has been available for several years. After several years of technological and production improvement, most of the six types of products of the wiring manufacturers are mature, which leads to the formal adoption of the final standard. With the formal standards, the corresponding products are also relatively mature, so users can be more assured when selecting the six types of products. After six types of products are installed, users can use formal standards for certification testing, which ensures reliable investment.

You need to consider multiple aspects of the selected cabling product. One of the important factors is the scale of the project, especially the future IT development considerations of the project, which is also the most difficult to predict. No one knows the speed of the network in the next three, five, or even ten years, and what are the requirements for the speed of the network, just as it was hard to imagine the development of the Internet five years ago. The investment in cabling systems is a huge one-time investment. In the future, it will be easy to update network equipment, and it will be very convenient to replace switches and routers in the data center. However, it is almost impossible to replace the entire cable system. Investment in Category 6 is definitely expensive, so we need to consider the situation of funds comprehensively. If you can predict where the building is most likely to use high-speed networks in the future, you can also consider the use of cat5e and cat6 hybrid cabling. This is a compromise.

In short, understanding the relationship between network technology and network transmission media, as well as the current development status, is very beneficial to the choice of what cable system and how to invest.

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