综合布线系统外文翻译(编辑修改稿)

综合布线系统外文翻译(编辑修改稿)内容摘要：

will probably be run using fiber optic cable especially to increase the bandwidth of the data munications works. A Structured Cabling System (SCS) most simply stated is based on following a standard methodology defined by EIA/TIA 568 specifications when planning and installing work cabling for mercial buildings. 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 standards. We will examine: The Implications for future work design， What is likely to be technically achieved， What will we require in the cabling infrastructure. Summary The advantages offered by high specification copper cabling (category 6 or 7) in data works are likely to be limited and short lived. In order to avoid serious work disruptions in the future and save costly reworking, optical fibre to the desktop deserves serious consideration for new projects. This is also a business critical decision which could impact on your petitiveness. We should do what we can now to ensure our new work installations do not bee the legacy works of the (perhaps none too distant) future. Monotonous Rise in Network Data Rates since the 198039。 s when work speeds were dictated by the rotor speed of mechanical mechanisms (clunketyclunk teletypes), the works have seen a monotonous rise in data rates. The rise has followed Moore39。 s Law closely in the past but recently, it has shown evidence of an acceleration faster than that predicted by the law. Onegigabit data rates are available now and 10gigabit rates are predicted by 2020. Vertical LAN In any building distribution, the vertical work carries about 80% of the traffic. This part of a building local area work (LAN) is business critical but fortunately, it is relatively easy to make changes to it. Quite often, this part of the work is realised as optical fibre. At one time, the bandwidth offered by optical fibre was regarded as unlimited but that is not the case now. For example, at 1gigabit rates, there is a length limit of about 220m when using popular about 500m when using 50/125181。 m fibre. Greater distances imply the use of monomode fibre. Any changes to the building vertical LAN can usually be made in parallel with the existing work services so disruption of the service to the desktop can be kept to a minimum. Because of this, costs to the organisation due to interruption of work service can be kept small. Horizontal LAN When considering the horizontal distribution within a building, we see the same increase in data rates as predicted by Moore39。 s Law, showing the recent accelerating trend but lagging the vertical data rates by 5 years. So, we would expect 1gigabit data rates by year 2020 and 10gigabit data rates by year 2020. Indeed, 1gigabit work interface cards (NIC) are being shipped now。 it is just a matter of time before we start receiving demands for gigabit working at th。