Monday, October 25, 2010

Huang Shan Secondary School




Tangshan, Beijing-Shenyang Expressway - Qinhuangdao sections of the functions of office automation network is a variety of data, management information to effectively use the network organization and management up to the toll station can use the computer to process and query data from the network center, while at the center Beijing-Shenyang Expressway Management Office inquiry through the network in a timely manner, access to the toll station of the relevant data. The toll stations and network requirements can be achieved between the centers of data, image and video information sharing, while the transmission is simple, fast, and networks with appropriate redundancy to improve reliability.
Qinhuangdao, Tangshan central node by constructing a local area network, to achieve office automation; be achieved through the wide area network Tangshan - Qinhuangdao toll road between the Internet 17, to meet the highway communications, network monitoring and charging needs. System in the application are highly integrated nature require flexibility, fast and effective access to business information as much as possible, and in different areas of information Tailiangfuza an integrated analysis, Tigong assist decision-making functions. Effectively improve the transportation system capacity and operational efficiency. At the same time, we must protect the entire network of security and good scalability.
Digital China Networks meet the above requirements to provide a network solution. LAN using Ethernet and TCP / IP protocol, the toll station and management center, the E1 line between the use of 2M to achieve wide area network connectivity, by HDLC point data link layer protocol high-speed Internet.
Qinhuangdao, Tangshan node by node and four E1 lines to achieve 8M bandwidth interconnection. Qinhuangdao nodes interconnected with nine toll stations; Tangshan nodes interconnected with eight toll stations. Qinhuangdao and Tangshan nodes are backbone nodes, in order to ensure high performance, use Digital DCR-3660 core routers, each DCR-3660 with an MR-NM-4CE1 module for interconnection between the two key contacts, a number of MR-NM -4T module 17 toll stations are connected to the DCR-2501.
Use the various toll stations DES-1016R switches interconnected by computer, access routers use DCR-2501, to achieve the bandwidth and center management 2M interconnection.
Qinhuangdao center switches use DES-6000, up to 96 computers at the same time meet the wire speed to achieve mutual communication. Fast switching can be realized to the desktop, and Gigabit modules can be exchanged to achieve Gigabit to the server, to meet the multimedia services such as video communication applications, networked future expansion. Tangshan center switches use DES-1024R, in hundreds of switching to the desktop.
Qinhuangdao node also uses a platform DCR-1750 router for dial-up remote access and broadband INTERNET access, using MR-WIC-8ASY modules together eight common shooting the birds MODEM, 8 on a business trip to meet the staff at the same time through the PSTN Qinhuangdao highway network management center dial-up access LAN. MR-NM-1ETH module by fiber optic broadband access to the telecommunications INTERNET. Through the router's NAT static mapping function, which can meet the release of WWW home page, dynamic NAT function, which can meet only a legitimate IP to achieve all the computers to access INTERNET.
Between the Internet and internal LAN to place a station DCFW-1800 hardware firewall, which can meet the safety requirements on the LAN.









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