Research And Engineering Design Of The Digitized Plot's Communications System

Along with the high speed development of the modern communication,the computer network technology and the information industry, the digitization,the network and the information is melting into people's life day by day. Therefore, people are more and more urgent to the residential district intelligence service demand, the wide band intelligence plot construction also already became the focal point which the people paid attention.And service demand which grows day by day along with the user, like to VoIP, VoD, IPTV and so on to request a wider band, QoS to request the high service demand, set a stricter request to the plot wide band data load bearing network.The current pop construction of plot wide band network mainly selects following several methods:1,ADSL: The asymmetrical digital subscriber loop dsl, is one kind of technology that can provide the wide band data service through the cable telegram telephone line. ADSL supports stroke speed rate 640Kbps-1Mbps, gets down stroke speed rate 1Mbps-8Mbps.Its effective transmitting range is in 3-5 kilometer scope. In the plan in ADSL, each users all have an independent line that connect with the ADSL bureau end, and the data transmission band width is alone enjoys by each user.2,FTTB + LAN: The LAN uses the ethernet technology, and uses the optical cable + twisted pair line to carry on the comprehensive wiring to the plot. The plot wide band is named because at present the plot with wide band mostly selects this method. User's computer accesses the net through five kinds jump line turnning in the wall five kind of modules. LAN may providethe sharing band width above 10M, and may promote to 100M above according to user's demand.3,FTTH: (1) the way of PON, PON (passive light network) is one kind of technology which is spot to multi- spots with fiber optic transmission. (2) the way of (MC), (MC) is the new generation of optical fiber which promotes in the ethernet...