Comparison of seven kinds of wiring and optical fiber

The demand for bandwidth is increasing with the rapid development of network applications. This year's six-class cabling system, with its 250MHz bandwidth, has met most commercial applications today. However, with the continuous progress of technology, 250MHz bandwidth can not fully meet people's needs is only a matter of time. Therefore, in the next few years the development trend of cabling system on the seven types of cabling and optical cable is the best of the discussion.

The selection of cable types should be considered comprehensively from the use of cables, the required transmission capacity, transmission bandwidth and price. Cable type has unshielded twisted-pair, shielded twisted-pair cable, optical cable three categories.

(1) unshielded twisted-pair UTP, is currently the most widely used wiring system, suitable for transmission bandwidth under 250MHZ, no special performance requirements of the network applications, the advantages of the overall performance is good, cheap, construction and maintenance is more convenient. The six-Class cabling system has reached the performance limit of unshielded twisted-pair wires.

(2) aluminum foil shielded twisted-pair FTP, with a large bandwidth, strong anti-interference performance, with low smoke halogen-free characteristics. Relatively, the shielding line than the non-shielded line price and installation costs higher, cable bending performance slightly worse. Six type line and the previous shielding system uses this form more.

(3) Independent shielded twisted-pair STP, each pair of lines have a foil shielding layer, four pairs of lines together there is a common metal woven shielding layer, which is the standard structure of the seven-class line. It is suitable for high-speed network applications, provide highly confidential transmission, support the future of new applications, to help unify the current network applications cabling platform, so that from e-mail to multimedia video information, can be in the same set of high-speed system transmission. Additional shielding layer makes seven type line has a larger diameter, these characteristics require special care in the design installation route Hadan connection space, want to leave a lot of space and large bend radius, Corning company already launched 7 kinds of wiring system in China at present. (Computer science)

As early as 1997 wiring standardization agencies and manufacturers have put forward the concept of seven types of copper cabling system, which Corning in 1997 released the 600MHZ of the seven class wiring. It provides at least 500MHz of integrated attenuation to the crosstalk ratio and 600MHz overall bandwidth, and its connection head requires all the lines on 600MHz to provide at least 60dB of the integrated proximal end of the string. And the Super five type system only requires 43dB in 100MHz, six classes in 250MHz values for 46dB. Moreover, due to its excellent shielding design and high bandwidth, a typical seven-class channel can even provide a pair of line 862MHz bandwidth for the transmission of cable TV signals, in another line on the transmission of analog audio signals, and then in the third to fourth line on the transmission of high-speed LAN information. This application is unimaginable at present, but will soon be realized by seven kinds of wiring system, at present the US Corning Company's seven kind of wiring system has already been leading the industry to reach the 1200MHz bandwidth.

Compared to fiber-optic LANs, the seven-class system offers the desired performance and bandwidth, but its overall cost is only one of a fraction of the fiber. Some people think that fiber-optic systems can bring enough bandwidth to people, and cable is close to the price of seven types of cable. However, if you take into account the cost factors of fibre-optic routers, optical switches and optical adapters, the price advantage of the fiber will soon be lost.

(4) Optical fiber cables, especially single mode optical cable can be used for high-speed network transmission, and has innate electromagnetic interference immunity, strong reliability, support long-distance transmission and other advantages, is the future ideal network transmission media, its status is increasingly important. But optical cable equipment, materials and end-connection costs are relatively expensive, installation is also relatively complex, it is generally suitable for long-distance and large-capacity wiring. At present, 62.5/125μm multimode optical fiber cable has been in the integrated wiring backbone system has become the mainstream wiring media, the application of the level system has become increasingly widespread, Corning has now launched a full set of optical fiber to the desktop cabling system, and in May this year officially launched 10G cable wiring system.

The new version of TIA/EIA-568-B.3 provides the mechanical and transmission properties of fiber, connection hardware, and fiber jumpers. The most notable enhancement compared to 568-a is the recognition of 50/125μm multimode fibers and the recognition of small component (SFF) fiber connectors as the connector in the workspace, in addition to SC connectors. Allowing the use of SFF connectors offers many benefits to end users, such as the larger size of SC connectors that do not support industrial trends in which the device interface develops toward high-density, and the use of SFF connectors makes it easy to connect two-core fibers in the same space as RJ-45. Due to Tia's recognition of SFF fiber optic connectors, optical fiber device manufacturers such as Cisco, 3Com, IBM and so on have integrated these interface designs into their products.

To meet industry's demand for SFF fibre-optic connectivity hardware, Corning fully supports MT-RJ and LC small component fiber optic connectivity products to provide common, high-performance fibre optic connections. Corning Unicam series MT-RJ Connectors only SC connector One-third size, the site-free fusion technology fast and convenient, the average per-core fiber terminals less than 1 minutes.

In short, with the introduction of the seven standards in the end of this year, high-quality cable products and connectors, as well as testing bandwidth up to 750MHZ LAN cable tester will give people a wide spectrum of broadband applications to bring great possibilities and convenience. In the range of 1 to 2GHz of bandwidth, the seven-class line will win the market with its price advantage and extensive application support, and the All-optical network will win in the future higher bandwidth application range.