China Tongfang network cable is a cable network communication, to achieve national testing standards. Tsinghua Tongfang cable transmission, superior performance, strong mechanical properties, temperature effects, stable electrical performance, low propagation delay, small size, impedance, good, excellent crosstalk, return loss and isolation and low insertion loss. Tsinghua Tongfang network cables are divided into: Tongfang network cable UTP cable, network cable Tongfang six cable. 50% of the global wiring is Category 5 cabling, 30% is Category 6 cabling. For Gigabit speaking, as soon as possible in order to put to use in the past, support for these two types of cabling system is an issue that must be considered. However, there are some different views in some of the research program on Gigabit that run on Gigabit fiber is enough, do not consider Category 5 Category 6 cabling systems. International Standard 802.3ae Gigabit early as the end of 2003 it was released. However, the development of Gigabit is not as smooth as originally thought. The biggest problem is how to Gigabit technology seamlessly with existing network connection, users want the best without changing the existing network architecture and cabling systems, smooth upgrade to Gigabit. In practical applications, the wiring layer may not change the access, the use of existing wiring system is enough, but such a configuration for the access layer device, it can only maintain the current transmission rate of 100Mbps, In order to run it on a Gigabit rate is impossible. Gigabit if only to play a role in the core layer and access layer, or use the existing technology, then the era of large-scale applications Gigabit difficult to come soon. This is not the original intention of Gigabit development. Category 5 cable and Category 5 cable to run 10G whether it should be included in 10GBase-T standard is being formed, which is some controversy in the definition of the next generation of chips caused by the physical layer. Today, more than half of companies are using Category 5 cable can complete the 10Gbit / s data transfer tasks, many electronics and cable companies are skeptical. Currently, the IEEE 802.3an task force to develop a draft standard has been super Category 5 cable excluded, but this is not a final decision. SolarFlare companies use a custom 10G transceiver and a number of samples of the 8-bit A / D converter in the 50 meters over Category 5 cable to send a 10Gbit / s signals. The company said that when its custom 9-bit A / D converter is launched, it can transmit 100 meters distance. However, by early 2006 10GBase-T standard is completed, SolarFlare impossible to launch the product. Its products may include a new version of A / D, as well as integrated transceiver 4 million transistors on 90nm linewidth. Ethernet router and switch maker Force10 will also support 10G fiber connections, in its view, from a technical point of view, will enable 10G over Category 5 cable into the business field and low price, because the use of the fiber is too expensive. Cisco, Intel and end-users Union supported the American National Laboratory in 10GBase-T standard contains over Category 5 cable plan. But cable manufacturers are opposed to the plan, they believe that the old cable can not meet the performance requirements of 10G transmission. 100MHz is Category 5 and Category 5 cable specified bandwidth, but some companies have already enhanced version of 350MHz were tested. 802.3an task force has now been designated 10GBase-T bandwidth 650MHz, but this figure could be reduced to 500MHz. SolarFlare and other companies believe that over Category 5 cable can reach 350 to 400MHz bandwidth, and said that the idea CAT7 10G needs is wrong. 802.3an Task Force has set a goal to specify the use of 200MHz 10G CAT6 cables in the 55-100 meters away, or use the 600MHz CAT7 cable at 100 meters. Some people think that the final version of the specification contains over Category 5 cable is possible. Now, the task force has discussed two signaling methods. SolarFlare recommended based on a 10-way 833 Msample / s PAM (Pulse-Amplitude Modulation, pulse amplitude modulation) code modulation format, Intel is recommended 8 1000 Msample / s PAM low-density parity. Most laboratories are now over Category 5 cable, standard introduced after 2006, half of the cables are going to be super-5 cable, if it is running 10G and low prices, it certainly would not reject it. Some users of the cable length does not exceed 50 meters in the future they may also access 10G, but the re-design of ultra-5 cable to implement this technology is not perfect, and some type of super-5 cable performance is not at the time when such 250MHz 450MHz Okay.