【正文】 ngs. The purpose of this standard is to specify a generic telemunications cabling system for mercial buildings that will support a multiproduct, multivendor environment. It also provides information that may be used for the design of telemunications products for mercial enterprises. The EIA/TIA568 standard includes EIA/ General Requirements,EIA/ Copper Cabling Requirements, EIA/T Fiber Cabling Requirements. Industrial Considerations So what changes for the industrial environment related to the SCS? Actually very little. All the same standards apply including installation requirements and test requirements. And if you mount everything inside NEMA rated enclosures then nothing changes at all. However if you want to plug into the work from outside the enclosure there is a new connector style available called Industrial RJ45. The specifications are being developed by EIA/TIA and ODV and are nearly plete. Many IT managers are unsure of which new technologies to follow. This is partly due to the considerable marketing hype from the manufacturers. The standards bodies are also taking time to ratify category 6 and this is causing uncertainty within the industry. We will be presenting a strategy and method for structured cabling that will be the most cost effective solution for today39。s occupants, so this sort of activity is normally undertaken when there is a major refurbishment of the fabric. Cableways have to be formed in, on or under walls, floors and ceilings. The installers have to ensure that results are not unsightly but inevitably there is damage to the amenity value of the rooms through which cables have to pass. Care has to be taken to provide adequate and presentable cable containment for both power and voice/data cables. This all means expense. The cost of ownership is high. It was precisely because of these high costs that unshielded twisted pair (UTP) ether was developed. This permitted the use of existing, low grade, category 3 telephone cabling within buildings. Strenuous efforts have been made to improve the bandwidth capabilities of this popular medium. However, once firmly established, economic improvements to this system could be made only by redesign of the cable, leading to the production of category 5, 5e and 6 cables with category 7 in the pipeline. These improvements have enabled the development of 10megabit, 100megabit and 1gigabit ether over UTP. Indeed, it has been said that you can transmit and receive data at gigabit per second rates with acceptable error rates over barbed wire. It39。s staff. The extra bandwidth that fibre offers can be provided on a piecemeal basis and in parallel with existing wiring when need or budget permits. It allows expenditure to be deferred. Blown fibre is raw fibre (about diameter). It is protected from damage by the preinstalled conduits. It is cheaper than traditional fibre cable where fibres are encased in the familiar plastic sheath. The grade of fibre can be changed if circumstances change or if damage occurs. Old fibres can be quickly and easily withdrawn and replaced by different ones. Conduits are small and can be carried by traditional cable containment. Damaged conduit can be repaired by cutting out and the damaged section and replacing it with new tube. As fibre has all the advantages of proven technology, far superior immunity to electrical noise, intrinsic electrical safety, superior bandwidth capability, a high degree of data security and the ability to carry signals over long distances permitting the use of collapsed backbone topologies, its use or potential use ought to be seriously considered for all new cable installations. If history teaches us anything, it39。 it is just a matter of time before we start receiving demands for gigabit working at the desktop. High bandwidth/critical bit rate applications such as VOIP, video streaming, video conferencing and puter aided design (CAD), are being mon. Unlike the building39。T type D unshielded twisted pairs shall be used. Each voice/data wall station will receive four type D cables. Each 4pair D cable will be terminated