Structured Cabling System in the Three Gorges Project

Project Overview
The dam area of the world-famous Three Gorges project is located in sandouping, Yichang City, Hubei Province, and the Three Gorges Project construction management center is located in the 15th work area of the dam area. In order to effectively manage the progress and quality of the Three Gorges Project, coordinate the relationship between construction units, establish a strong communication and computer network system, and collect and process a large amount of information. Communication and computer network systems are based on network cabling systems. Therefore, the managers of the Three Gorges project decided to use the most advanced ideas and technologies to build the cabling system in the management building to meet the requirements of communication and computer networks and the future development. Because users require a large amount of information in information management, there are not only a large amount of data information, but also a large amount of multimedia information. In addition, the user requires that the voice point can also be connected to a high-speed data terminal or directly connected to the PC network, that is, the audio line and data line must meet the same technical requirements. At the same time, the user clearly pointed out that the network must meet the requirements of the ATM technology.
The company plans and designs voice and data systems in a unified manner to build a modern internal communication system including high-quality voice systems and high-speed computer network systems. The cabling system supports various network protocols and topologies flexibly. It supports 10 M Ethernet, M Ethernet, and ATM networks, and implements shared, exchange, and shared-and-switched network management, flexible construction of the entire building network mode. It also uses a distributed management system that fully considers the requirements of Later users for investment in network equipment and has strong scalability.
System Design
The Yangtze River Three Gorges has fully considered the use of modern technology in the architectural structure design. Two dedicated Weak Current shafts are set up in advance on each layer for the management of wiring systems and other weak current systems.
The Structured Cabling System of the Three Gorges Construction Management Center office building adopts the design concept of distributed network management. On each floor of the office building, Telecommunication Cross-Connect is established using a reserved pipe well. It is used to manage horizontal information points of each layer and place network equipment.
Main Cross-Connect is divided into two types based on the nature of the service. One is the computer network center and the other is the program-controlled data center. The main computer wiring room is set up on the 11th floor of the building, and various switching devices and wiring devices are concentrated, such as some network devices and expensive host systems. On the 12th floor of the building, a wiring room for the program-controlled data center is set up to connect the program-controlled switches for communication in the building. The two data centers are respectively set up to manage their own systems, enhancing the confidentiality and security of the system.
The position of the relay wiring room Entrance Closet) is determined based on the nature of the relay line and the method of entry to the building after full contact with the telecommunications department.
In the trunk subsystem, 62.5/125 Micron Optical Fiber is used as the backbone of the data link. Each main line of the voice system is equipped with four pairs, which can fully meet the communication requirements of the voice, and can fully meet the communication standards of the integrated business digital network ISDN. When the Three Gorges Construction Management Center needs to connect to other buildings at home and abroad through the integrated business digital network ISDN, It is very convenient to form a comprehensive information exchange system through the current structured cabling system platform, fully adapt to the future development trend of information systems.
According to the final statistics, there are a total of 2500 information points on each floor of the Three Gorges Construction Management Center office building.
Workspace Subsystem
The workspace subsystem consists of a connection between a terminal and an information outlet. It consists of an extended soft line that is compatible with a soft line, connector, and connection. The work zone components involved in the Three Gorges Construction Management Center project are as follows:
Information outlet: there are two types. One is the copper information outlet meeting the general communication requirements, and the other is the hybrid media outlet meeting the optical fiber communication requirements.
Work area Jumper: there are two types. One is the copper patch cord that meets the general communication requirements, and the other is the optical fiber patch cord that meets the optical fiber communication requirements.
Five modules: Both speech and data use five modules and sockets, so that the voice socket can transmit Mbps of high-frequency signals.
Level Subsystem
The level subsystem is a connection from a wiring or jumper panel to an independent workstation or workgroup. The level subsystem components involved in the Three Gorges Construction Management Center project are as follows:
Cat5e twisted pair: the transmission requirements for the selected twisted pair have been defined by EIA/TIA-568A standards, which are suitable for applications with a transmission frequency of up to MHz.
Trunk Subsystem
The trunk subsystem consists of the interconnection cables between sub-systems, management sub-systems, and the entry ports of the Horizontal sub-systems. It is the main feed cable in a building, and is the vertical or horizontal trunk cable between floors. The trunk subsystem components involved in the Three Gorges Construction Management Center project are as follows:
Six-core indoor Optical Fiber: This type of Optical Fiber conforms to all industrial standards and is suitable for use in vertical cabling, master and master trunk cabling, and application environments from trunk Branches to various floors. Three cat5e twisted pair wires are laid at the same time as trunk optical fiber cables for backup. This will further improve the flexibility of the cabling system and provide more choices for network system designers.
Category 5, 25 pairs of large logarithm cables: the category 5 unshielded cables provide more available cable pairs and are designed to be suitable for high-speed data communication applications with extended transmission distances, its extended performance specifications reach 100 MHz, and this PLENUM-rated cable can be installed in a ventilation well without using a catheter.
ST head: A Precision Optical Fiber Connector that complies with ISO/IEC11801 international standards. Use special tools to contract them to the fiberglass of the optical fiber.
Optical Jumper: Optical Jumper can be used for better maintenance of Optical Fiber devices. In this project, a 5-meter ST-SC Optical Fiber jumper is selected for jumper between the Optical Fiber Interface Box and network equipment.
Management Subsystem
The management subsystem provides a means to connect to other subsystems, so that the entire Integrated Wiring System and its connected devices and devices constitute an organic whole. The management subsystem is usually set in the room of a wiring device. It usually consists of wiring hardware, input/output I/O devices, and so on. The management subsystem components involved in the Three Gorges Construction Management Center project are as follows:
Data Distribution Frame: The use of data distribution frame Patch Panel makes management and maintenance very convenient and simple. The data distribution frame used in this project has 24 ports and 48 ports.
Voice Distribution Frame: The Voice Distribution Frame uses the 110 system XC series products. By using such devices, you can flexibly and conveniently manage the communication requirements of the voice system. Distribution Frame management devices: management devices of the distribution frame are used in combination with the distribution frame to gather jumpers between the distribution frames.
Optical Fiber Interface Box: Different Optical Fiber Interface boxes are used to manage the Optical Fiber System of each subsystem. 48 Optical Fiber Interface boxes are used in the floor wiring room to manage the Optical Fiber System of the horizontal subsystem. 12 Optical Fiber Interface boxes are used to manage the optical fiber interface boxes of the vertical subsystem, the 48-port rack-mounted Optical Fiber Interface Box is used to manage the optical fiber system.
Inter-device Subsystem
A device subsystem refers to a device-related system within a device. The EIA/TIA569 Standard specifies the cabling between devices. It is the primary management area of the cabling system.
The Inter-device subsystem integrates a large number of management devices for cabling systems. At the same time, some of the main network equipment in the building, expensive host systems, and program-controlled switches that ensure communication in the building are usually located in the sub-systems of the equipment room.
Acceptance and completion
The Three Gorges Project is a hundred-year Plan. The Management Center has standardized and high-quality project organization and construction requirements, and has strict requirements on project acceptance and document sorting. After the construction of the project is completed, the engineer collects all the data on site, sorts and installs the data in a book. There are 2168 copper cable information points and 156 Optical Fiber points.