tailieunhanh - Ultra Wideband Communications Novel Trends System, Architecture and Implementation Part 14

Tham khảo tài liệu 'ultra wideband communications novel trends system, architecture and implementation part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | UWB-over-Fibre in Next-Generation Access Networks 315 common architectures are Fibre-to-the-Home FTTH Fibre-to-the-Building FTTB FTTCurb FTTC and FTTNode FTTN Kunigonis 2009 . Fibre-to-the-premises FTTP is a term used in several contexts as a blanket term for both FTTH and FTTB or in the cases where the fibre network includes both homes and small businesses. Each of these has a different physical architecture as depicted in Fig. 2 and its main characteristics are described below FTTH pushes fibre all the way to individual residential wells. FTTH is completely absent copper in the outside plant and provides at least 30 Mbps service but due to the inherent characteristics of optical fibre can provide literally infinite bandwidth. FTTB typically uses the Point-to-Point P2P architecture in the outside plant providing a dedicated fibre to each building or block of buildings. The fibre is terminated at a Remote Terminal RT which is an active device requiring powering and security typically located in the basement communications room or utility closet. Usual FTTB applications have been providing at least 10 Mbps. If twisted pair is installed to provide requirement bandwidth services it can reach up to 50 Mbps. FTTC also called Fibre-to-the-Cabinet FTTCab extends fibre to a street-side cabinet or Digital Loop Carrier DLC . Typically uses ADSL2 technology pushing fibre 150-700 m from the subscriber terminating at a RT. FTTN is similar in architecture to FTTC except that the RT is positioned much further from the subscribers up to 1500 m and can serve 3-500 subscribers. Both utilize existing twisted pair outside plant to connect to the customer. In this case bandwidth is dictated by two factors DSL technology and copper loop length. Fig. 2. FTTx Deployment Signals over copper are significantly degraded over long distances directly affecting the bandwidth capacity. In the most extreme conditions 4-5 km some customers may not even be able to be served by DSL. In some cases the

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