Campus Network Integrated Wiring System Design Scheme

Computer Network Technology is closely related to integrated wiring systems. With the rapid development of computer and communication technologies, network applications have become an increasing demand. Structured Cabling is the basis for network implementation, it is a powerful supporting environment for today's and future computer networks and communication systems. Therefore, while designing the Integrated Wiring System, we must fully consider the new trends of the network technology and network technology used to avoid redundancy and waste of hardware resources, so as to give full play to the advantages of integrated wiring.

1. structure and design of structured Integrated Wiring System
The integrated cabling System (PPS) is an open cabling System that supports almost all data, voice devices, and various communication protocols, because the development of the communication technology is fully taken into account by the tps', the design has enough technical reserves to fully meet the long-term needs of users, which is widely used. In addition, the structured Integrated Wiring System is highly flexible, with changes in the location of various devices and LAN without re-wiring. As long as the cabling is adjusted properly in the cabling system, the requirements can be met. Structured Cabling is generally divided into six subsystems.

1-1. workspace subsystem Work Area) and Network Design
The workspace subsystem consists of a connection between a terminal device and an information outlet. The information points are composed of standard RJ45 sockets. The number of information points should be determined based on the actual functions and needs of the work area, and an appropriate number of redundancy should be reserved. For example, you can configure 2 ~ 3 information points. In addition, 3 ~ should be configured for this Office Area ~ Five specialized information points are used for Working Group servers, network printers, fax machines, video conferences, and so on. If the office area is a business application, the bandwidth of the information point is MB, which can meet the requirements. If the office area is a technology development application, each information point should be a m exchange type or even a fiber optic information point.

Terminal devices in the work zone, such as telephones and fax machines, can be directly connected to each information outlet in the work zone by Corning FutureCom cat5e or cat5e twisted pair wires, or use adapters such as ISDN Terminal devices), balanced/non-balanced converter to convert and connect to the information outlet.

1-2. Horizontal subsystem Horizontal and Its Network Design
The level subsystem connects the information outlet and management subsystem, that is, the intermediate distribution frame IDF. The topology specified by the level sub-system is a star topology. The horizontal trunk is designed to integrate the transmission media and components of the horizontal subsystem. Select the cables of the level subsystem. The cables are determined based on the type, capacity, bandwidth, and transmission rate of the specific information points in the building. In the level subsystem, the recommended twisted pair cables and optical fiber models are: Corning FutureCom cat5e or cat6 unshielded twisted pair cables, and FutureLink single-mode or multimode optical fiber cables.

The maximum horizontal cable length in a twisted pair horizontal cabling link is 90 m. If 100 Ω UTP twisted pair cables are used as horizontal subsystem cables, different types of cables can be used based on different information point types. For example, FutureCom cat5e or cat6 twisted pair cables can be used for voice information points and data information points, even the FutureLink optical cable is used. If the electromagnetic interference is serious, the Corning FutureCom cat6 shielded twisted pair cable should be used as much as possible. However, from the perspective of system compatibility and flexible interchange of information points, it is recommended that the horizontal subsystem use the same wiring material.

1-3. Management Subsystem Administration) and Network Design
The management subsystem is composed of communication, interconnection, and input/output to implement wiring management and provide means for connecting other subsystems. It consists of distribution frame, jumper equipment, and optical distribution frame. When designing a management subsystem, you must understand the basic design principles of the line and reasonably configure the components of each subsystem. Corning's LANscape integrated cabling solution has a complete set of scientific and easy-to-manage products for the management subsystem.

1-4. trunk system Backbone) and Network Design
Trunk subsystem refers to the routing of the trunk cable of a building. It is used to connect the main distribution rack and the intermediate distribution rack, and connect the computer, PBX, control center, and management subsystems. The Design of trunk transmission cable must meet both current needs and future development. The shortest, safest, and most economical route of trunk cable should be selected for trunk subsystem cabling. During System Design and Construction of the trunk subsystem, some cables should be reserved for redundant channels. This is very important for the scalability and reliability of the Integrated Wiring System.

Trunk subsystems can use three types of cables: HAY, FutureCom, cat5e, cat6, and FutureLink single-mode or multimode optical fiber cables.

Cat5e twisted pair can support 1000BASE-T, but cat6 twisted pair must be used if 1000BASE-TX is required. If the installed cables only meet Category 5 cable standards (1995), the cabling system should follow the new wiring parameters such as return loss before connecting to the 1000BASE-T device, classification of remote crosstalk (ELFEXT), propagation latency, latency distortion, etc.) for measurement and authentication.

1-5. device subsystem Equipment Room) and Network Design
The Inter-device subsystem consists of cables, connectors, and related supporting hardware in the equipment room to interconnect various public system devices. The main devices are digital switches, computer network devices, servers, and building automation equipment hosts. They can be put together or set separately. In large-scale integrated wiring, computer equipment, digital programmable switches, and building automation equipment hosts can be separately set up to place hardware devices closely related to integrated wiring between devices, the computer network equipment room is not far from the device room.

1-6. Architecture Subsystem Campus Subsystem and Network Design
The building group subsystem is the hardware required for communication facilities between buildings. Wired or microwave or radio communication can be used between buildings.

In Corning's LANscape Integrated Wiring solution, Corning FutureLink Optical Fiber not only supports FDDI trunk, 1000Base-FX trunk, 100Base-FX to desktop, ATM trunk and ATM to desktop, it can also support CATV/CCTV and fiber-to-desktop FTTD), and is a star in the Wired Communication Cable Used in the cabling of the complex subsystem and main trunk subsystem. Two types of optical fiber are available: Single-Mode Optical Fiber and multi-mode optical fiber. Single-Mode Optical Fiber only transmits the main mode, which completely avoids modal dispersion and has a wide transmission band and a large transmission capacity. It is suitable for optical fiber communication with large capacity and long distance. It is an inevitable trend in the future development of optical fiber communication and light wave technology, such as: 1000BASE-LX Based on 1300nm single-mode optical fiber cable, using 8B/10B encoding and decoding, the maximum transmission distance is 3000 m, the optical fiber transmission distance produced by Corning is 5-10 times of the standard distance. There are many transmission modes of multimode optical fiber, with a certain amount of modal dispersion and wide band, large transmission capacity currently uses 62.5/125 μM Multi-Mode Optical Fiber. When the data transmission rate is 2 km Mbps, the maximum distance can reach), but the distance to transmit Gigabit data is very limited.

2. Typical campus network solution for Integrated Wiring application instances)
2-1. Network Design
For the specific performance requirements of Campus Networks and the expenditure on network construction, three schemes can be designed for reference.
Solution 1: the backbone network and the second-level local area network solution based on the exchange technology, such as: Hunan Normal University Campus Network );
Solution 2: the backbone network solution based on the core router, for example, the campus network of Southeast University );
Solution 3: Campus Backbone network solution based on ATM Cell Exchange technology, for example, Hunan University campus network ).
This article mainly discusses the first widely used scheme, that is, Integrated Wiring of the backbone network and the second-level Local Area Network Scheme Based on the exchange technology.

2-2. Network Topology
The campus network structure of Hunan Normal University is a hierarchical star structure with three levels of network:
The first level is the network center, which is the central node. The Network Center is located in the central building (Experimental Building) in the school region, and the core equipment of the campus network is arranged, such as routers, switches, servers (WWW servers, email servers, dial-up servers, domain name servers, etc.), and reserved communication interfaces with several campuses outside the headquarters in the future.

Level 2 is the Backbone Node of the building group, which is a Level 2 node. The campus network is equipped with several trunk cable lines by region, radiating from the network center to several major buildings, and connecting them to the secondary backbone nodes. The vswitch installed on the backbone network node is located at the second layer of the network. It is connected up to the backbone switch in the network center and down to the hub on each floor. The main bandwidth of the school campus network is 100 Mbps, And the upgrade to ATM or Gigabit Ethernet is considered.

Level 3 is the HUB in the building, which is a Level 3 node. A three-level node is a LAN device that is directly connected to servers and workstations, that is, an Ethernet or a fast Ethernet Hub 3COM stacked hub 3COM SUPERSTACK ). The Integrated Wiring in the design building can be selected as needed: for example, the trunk subsystem is canceled, and the subsystems between management subsystems and equipment are merged; the horizontal sub-system wiring is directly introduced to the main distribution frame between devices.

2-3. Design Description
The optical fiber cable for the subsystem of the campus network architecture adopts the method of reducing branch connections: A large-capacity multi-purpose Breakout trunk cable that is sufficient to support the communication capacity of several buildings is used to separate several small-capacity optical cables through the distribution frame, extend to the wiring room of each floor. In terms of application, backup, and resizing, due to the limited distance between multi-mode optical fiber for future Gigabit Ethernet and ATM Gbps support, therefore, from the network center to the branch Decreasing End Point, 36 or 48-core Single-Mode MPC optical fiber should be selected, and bandwidth above Mbps is supported. The Single-Mode Optical Fiber with 12-core and 6-core is used according to the data traffic and the number of information points from the decreasing end point of the optical fiber branch to the equipment subsystem in the building. Horizontal cabling in the building uses cat6 unshielded twisted pair wires as transmission media, and desktop computers access the network at a rate of M.

The network center facility is CISCO's Catalyst 2924 switch and CISCO 3640 router. The Catalyst 2924 switch is mainly used to establish a high-bandwidth express channel between the local networks of different departments and departments to improve the efficiency of data exchange and information between different local networks and access public data resources. Another advantage of the Catalyst 2924 switch is that it has excellent virtual network support capabilities and can establish necessary virtual networks across different systems or departments, this greatly facilitates network application, management, and maintenance. All servers in the network center can be directly connected to the Ethernet port or fast Ethernet port of the CISCO Catalyst 2924 switch in the center to solve possible bottlenecks.

A 3COM Switch is configured in each building to divide consecutive IP addresses into subnets and establish a virtual LAN. Servers of different systems or departments can be directly mounted on the 3COM Switch. Each unit building can have a 3COM superstack hub on each layer, or a 3COM superstack hub can be shared on several layers. All these 3COM SUPERSTACK hubs are connected to 3COM switches in the building. 3COM superstack hub can be connected to workstation, server, or LAN of each organization. 3COM superstack hub is a flexible stack HUB. It can be flexibly changed based on the change and development of the Department's application scale, so as to achieve the maximum benefit with the minimum investment. In addition, 3COM superstack hub also supports SNMP Simple Network Management Protocol, so it can run effectively on a unified network management platform.

Individual users and individual users who cannot access the Campus Backbone Network temporarily in the park can use MODEM to connect to the campus network through Telephone Dialing.

2-4. Technical Features
The modular star topology is used, and the trunk segments are independent of each other to facilitate network maintenance and expansion.

The fiber trunk uses a single-mode optical fiber cable, which is conducive to gigabit network and higher speed network applications in the future. In addition, the network mode is flexible through different jumpers. Yes: 1) point-to-point. Establish express connect between two computers. The transmission rate is dozens of Mbps to several hundred Mbps, and the distance is up to 2km multimode) to 5km single mode ). 2) logical star network. A Fast Ethernet or ATM network with a star network topology is established using optical fiber network devices. 3) ring network. Connect the optical fiber with a signal generator to form a loop and form an FDDI backbone network.

All the cables in the building use cat6 unshielded twisted pair wires, which are cost-effective and easy to construct, and can reach a data transmission rate of 155/622 Mbps and support Mbps ATM.

The switch is implemented on the second layer. It truly supports plug-and-play operations without manual intervention.

It is very convenient to expand the campus. For schools in multiple campuses, each campus can design a LAN according to the above scheme, and then link the L3 Switches of the network centers of each campus through satellite communication or dedicated remote communication lines, achieve long-distance communication to form a unified Multi-campus network.