Structured wiring system in the Three Gorges Project

Project Overview
The Three Gorges project, the dam area is located in Yichang, Hubei province, the Third Gorges Construction Management Center building located in the 15th area of the dam district. In order to effectively manage the progress and quality of the Three Gorges Project, to coordinate the relationship between the construction units and to establish a strong communication and computer network system, collecting and processing a large amount of information has become the most basic requirement. The basis of communication and computer network system is network wiring system. Therefore, the management of the Three Gorges Project has decided to build a wiring system with the most advanced ideas and technologies in the building, in order to meet the requirements of the current communication and computer network, as well as the future development. As the information management requirements of the user is very large, not only have a large number of data information, there is a large number of multimedia information, in addition, users require voice points can also be connected to high-speed data terminals or directly connected PC network, that is, the requirements of audio lines and data lines to achieve the same technical requirements At the same time, the user clearly pointed out that the network to meet the requirements of ATM technology.
Blue Deep Company will voice, data Systems unified planning, design, to build including high-quality voice system and high-speed computer network system of the modern building communication system. This wiring system can flexibly support a variety of network protocols and topologies, with the ability to support 10M Ethernet, 100M Ethernet and ATM network, to achieve the sharing, exchange, sharing and exchange-type network management, flexible construction of the whole building network mode. It also uses the distributed management system, fully considering the late users in the network equipment investment requirements, at the same time has a strong extensibility.
　　
System Design
The Three Gorges project has fully considered the problem of the use of modern technology in the design of the building structure, and has set up two special weak shafts for wiring system and other weak-current system management in advance on each floor.
The structural wiring system of the Three Gorges Construction and management Center uses the design idea of distributed network management. On each floor of the office building, a floor distribution room (telecommunication cross-connect) is established using the reserved wells to manage the level information points of each layer and to place the network equipment.
Main wiring Room (main cross-connect) according to the nature of the service can be divided into two, one is the computer network Center, one is the program control room. Set up the computer main wiring in the building's 11 floor, centralized each kind of exchange equipment and the wiring device, like some network equipment, the more expensive host system. The building's 12 floors set up the program control room wiring room, connects the building to communicate the SPC exchange and so on. Two computer rooms are set up separately to manage their own systems, which strengthens the confidentiality and security of the system.
The location of the relay wiring Room (entrance Closet) is determined in accordance with the nature of the trunk line and the way in which it was entered after full consultation with the telecommunications sector.
In the trunk subsystem, use 62.5/125 micron Fiber as the backbone of the data link. Each backbone of the voice system, which is equipped with 4 pairs, fully meets the voice communication requirements, and is equipped to fully meet the communications standards of the Integrated Services Digital Network (ISDN). When the Three Gorges Construction Management Center needs to connect with other buildings at home and abroad through the Integrated Service Digital Network (ISDN), it is very convenient to compose a full range of information Exchange system through the existing structured wiring system platform, which can fully adapt to the future development trend of information system.
After the final statistics, the Three Gorges Construction Management Center office building each floor information points amounted to 2,500. (Computer science)
　　
Work Area Subsystem
The workspace subsystem consists of a terminal set up and connected to an information outlet, which includes a fitting cord, a connector, and an extension cord for the connection. In the Three Gorges Construction Management Center project involved in the work area components are as follows:
Information outlets: divided into two types. One is to meet the general communication requirements of the copper cable information outlets, the other is to meet the optical fiber communication of the mixed media outlets.
Work area jumper: divided into two types. One is to meet the general communication requirements of the copper cable finished jumper, the other is to meet the requirements of fiber optic communication fiber jumper.
Five types of modules: voice and data are used in five types of modular sockets, so that voice sockets can also transmit 100Mbps high-frequency signal.
　　
Horizontal Subsystem
The horizontal subsystem is wired from wiring or jumper panels to stand-alone workstations or workgroups. The horizontal subsystem components involved in the project of the Three Gorges Construction and management Center are as follows:
Five types of twisted pair: The selected twisted pair transmission requirement has been defined by the EIA/TIA-568A standard, which is suitable for applications where the transmission frequency may reach 100MHz.
　　
Trunk Subsystem
The main trunk subsystem consists of interconnected cables between equipment subsystem, management subsystem and the inlet device of the horizontal subsystem. It is the main feed cable in the building, is the general designation of the vertical (or horizontal) trunk cable between the floors. In the Three Gorges Construction Management Center project involved in the main line subsystem components are as follows:
Six-core indoor fiber: This optical fiber conforms to all industrial standards and is suitable for use in the vertical wiring and building trunk wiring as well as from the trunk branch to the various floors of the application environment. At the same time laying the backbone optical fiber, the same time laying 3 five types of twisted pair, as backup. This can further improve the flexibility of cabling system, for the network system designers to provide a greater choice.
Five categories of 25 pairs of large logarithmic cables: The five types of unshielded cables in the amp provide more available line pairs and are designed to enable high-speed data communication applications on extended transmission distances, with extended performance specifications of 100MHz, which are rated plenum cables that can be installed without a catheter in the ventilation shaft.
St Head: It is a kind of more precise optical fiber connector device which accords with iso/iec11801 international standard. By means of special tools, they are pressed onto the fiberglass fiber.
Fiber jumper: Fiber jumper can be used to achieve better maintenance of optical fiber equipment. In this project, 5 m ST-SC fiber jumper is selected, which is used to jump between the fiber interface box and the network device.
　　
Management Subsystem
The management subsystem provides the means to connect with other subsystems, so that the whole cabling system and its connected equipment, devices and so on constitute an organic whole. The management subsystem is usually set up in the room of the wiring device, which is usually composed of wiring hardware, input/output (I/O) equipment. The management subsystem components involved in the project of the Three Gorges Construction and management Center are as follows:
Data wiring Frame: the use of data distribution frame Patch Panel makes the management and maintenance very convenient and simple. The data distribution frame used in the project is 24 and 48.
Voice wiring frame: Voice wiring racks using 110 System XC series products. Using this device, it is very flexible and easy to manage the communication requirements of the speech system. Wiring Frame Management Device: the management device of the wiring frame is mainly used with the wiring frame, which is used to wrapping the jumper between the wiring racks.
Fiber interface box: Using different Fiber interface box to manage the fiber system of each subsystem. A 48-Port fiber interface box is used in the floor wiring to manage the optical fiber system of the horizontal subsystem, and a 12-Port fiber interface box is used to manage the fiber interface box of the vertical subsystem; In the center room, a 48-Rack fiber interface box is used to manage the optical fiber system.
　　
Subsystems between devices
The subsystem of a device refers to a device-related system within a device. The eia/tia569 standard stipulates the equipment wiring between the equipment, it is the most important management area of the wiring system.
The subsystem of the equipment centralized a large number of wiring system management devices, at the same time, some of the main network equipment, more expensive mainframe systems, to ensure that the building communication of the program-controlled switches are usually located in the subsystem of the equipment.
　　
Acceptance and completion
The Three Gorges Project is allocate, the management Center to the project organization and the construction request standardization, the high quality, in the project acceptance and the document reorganization request is very strict. After the construction of the project, engineers to collect all the data on the scene, finishing and sewing into a book, a total of 2,168 copper information points, 156 optical fiber points.