Key points: system design scheme
A, integrated wiring design scheme:
1. Workspace subsystem
Workspace wiring subsystem consists of connecting wires (or flexible wires) from terminal equipment to information sockets, including-connectors, connecting jumpers and information sockets; There are many kinds of information sockets, such as wall type, ground (waterproof) type and desktop type. Standards include: RJ-45, RJ- 1 1 and single, dual and multi-port structures.
2. Horizontal wiring subsystem
The horizontal wiring subsystem connects the cable from the floor distribution frame to the information socket in each user's work area. Usually, on the same floor, 4 pairs of shielded/unshielded twisted-pair cables of Category 3, Category 5 or Super Category 5 can be used. Category 3, Category 5 and Category 5 twisted pairs are all composed of 4 pairs of 24-AWG copper twisted wires. The error-free transmission distance of the three types of cables is 100 m in the application of 10MBPS, and 50 m in the application of 16MBPS; Category 5 cable 155MBPS can transmit 80 meters, 100MBPS can transmit 100 meters; The transmission distance of Super Category 5 can reach 100 m at 155Mhz, and optical fiber can be used at higher speed. In order to meet the requirements of high-speed data transmission, four pairs of UTP twisted pair of Putian Super Five are selected for data transmission. Because all the data lines used are ultra-five-level UTP twisted-pair cables, the bandwidth and transmission rate of ultra-five-level UTP twisted-pair cables can meet the requirements of information point 100M access in the campus network of Wuwei Vocational College. Super Category 5 cabling is used in conjunction with vertical trunk lines to provide a complete end-to-end cabling solution for bandwidth applications, which is suitable for network expansion and network expansion.
3. Vertical trunk subsystem (riser trunk subsystem):
Refers to the backbone cable between each layer of distribution frame and the main distribution frame: it can be twisted pair, optical cable or a mixture of the two; Its main function is to connect the main distribution frame system with the distribution frames of all floors.
4. Rack subsystem:
It is composed of floor distribution frame, whose main function is to connect the vertical trunk cable with the horizontal subsystem of each floor. The advantages and flexibility of the wiring system are mainly embodied in the wiring cabinet system. The information socket of any structured wiring system can be connected to any intelligent system through simple jumpers, which greatly facilitates the re-layout of lines and the re-adjustment of network terminals. When connecting optical fibers, an optical fiber junction box should be used, and there are multiple ST or SC connector installation ports in the box. Its line bending design meets the bending requirements of 62.5/ 125μM multimode fiber. The optical fiber connector adopts ST or SC type and is made of ceramics, plastics, stainless steel and other materials. Optical fiber couplers can be used to connect multimode optical fibers with network equipment or wiring devices. Distribution frame and optical fiber junction box are usually located in weak current wells or computer rooms, and are connected with other subsystems through jumpers and managed.
5. Equipment subsystem:
The equipment room subsystem consists of the main distribution frame and various public equipment. Its main function is to connect various public equipment (such as computer mainframe, PABX, various control systems, network switching equipment, etc.). ) is connected with the main distribution frame, and the subsystem also includes lightning protection devices.
6. Management subsystem (administrative subsystem):
A complete wiring system project should include: engineering design drawings, construction records, test reports, instructions for use and other materials, which should be sorted and filed for users to keep for the use and maintenance of the system. For the college campus network, in the design scheme, the information points of each layer are led to the wiring cabinets of each layer through PVC pipe slots, and a Putian super-category 5 24-port distribution frame is placed in the cabinet, and the connectors of each information point are jumper-configured, and then connected to the switch through the distribution frame. Putianchao 5-category 24 distribution frame (composed of mounting plate and 5-category RJ45 socket module) is adopted, which can be installed on 19 "standard rack, occupying only 1U space, occupying little space and being convenient for handling and migration. The front of the socket is a standard RJ45 socket, the port performance meets the requirements of super-five performance, and the shielding performance completely meets the standard requirements. The data backbone optical cable is terminated by Putian drawer 12 port optical fiber junction box. Super Category 5 series jumpers are used to connect the distribution frame to the port of the inter-equipment network equipment, and connect the wall socket to the computer network interface of the terminal equipment at the terminal.
7. Building wiring subsystem
The complex subsystem extends the cable of one building to the communication equipment and facilities of other buildings in the complex. It includes copper wire, optical fiber and protective device to prevent surge voltage of cables in other buildings from entering this building. In the comprehensive wiring design scheme of campus network in colleges and universities, when the distance between buildings exceeds 100 m and the computer data transmission distance exceeds 100 m, using optical fiber as the data backbone will be the best choice, which has higher bandwidth, higher confidentiality and anti-interference than large logarithmic cable. Therefore, Putian 6-core multimode indoor optical cable is used for the connection between buildings to support the transmission of data and information. In the comprehensive wiring design scheme of campus network, optical fiber will be used to interconnect the newly-built comprehensive teaching building, teaching building, office building, experimental building, canteen and student dormitory. And focus on the campus network center. Its laying method is indoor metal bridge and outdoor deep trench filling. In the design, all optical fibers, large logarithmic cables and telecommunication cable entering the main engine room are protected by metal bridge or steel pipe, and copper cables are electrically protected by protectors with IDC wires to prevent external voltage and current from harming personnel and equipment.
Two. Network design scheme
The network structure is a hierarchical star structure, and the network is divided into three levels:
The first level is the network center, that is, the central node. The network center is located in the central building (laboratory building) of the campus, and the core equipment of the campus network, such as routers, switches, servers (WWW servers, e-mail servers, dial-up servers, domain name servers, etc. ), it is arranged, and communication interfaces with several parks outside the headquarters will be reserved in the future.
The second floor is the backbone node of the building complex, which is the second floor node. A number of backbone optical cables are set up in the campus network according to the region, radiating from the network center to several main buildings and finally connecting to the secondary backbone nodes. The switch installed on the backbone node is located at the second layer of the network, which is connected to the backbone switch in the center of the network and the hubs on all floors. The bandwidth of the campus network backbone is all 100Mbps, considering upgrading to ATM or Gigabit Ethernet.
The third floor is the hub in the building, which is the third floor node. Tertiary nodes mainly refer to LAN devices directly connected with servers and workstations, that is, Ethernet or fast Ethernet hubs.
(3COM stack hub 3COM super stack). When designing the integrated wiring in the building, you can make some choices according to your needs: for example, cancel the trunk subsystem; Merging management subsystem and inter-equipment subsystem; Lead the wiring of the horizontal subsystem directly to the main distribution frame in the equipment room.
The backbone of the campus network adopts switched Gigabit Ethernet, which is connected by 10M/ 100M switched subnet (as shown in the figure).
Campus network wiring design generally adopts multi-level physical star structure and point-to-point connection, and any line failure will not affect the normal operation of other lines. The network adopts a decentralized three-layer switching system, and the secondary switches have three-level switching capabilities, so the trunk line pressure is low, and all of them realize 100 Mbps switching into the room. Three-level switches can be stacked, and the backbone and desktop switches can be integrated into a whole, providing enough switching ports and having good scalability.
1, Gigabit Ethernet is selected as the backbone network, and most of the third-layer Ethernet router switches conform to the IEEE802.3Z standard, with mature technology and traffic priority mechanism, which can effectively guarantee the QoS (quality of service) during multimedia transmission.
Gigabit Ethernet has good compatibility and scalability. When ATM technology is mature, it can be smoothly integrated into ATM network as an edge subnet of ATM network.
The workgroup subnet can choose 100M switching mode. Make the user terminal monopolize the data exchange of 100M bandwidth. The transmission bandwidth between the core switch and the workgroup switch is 100Mbps. When full duplex is used, the transmission bandwidth is 200Mbps.
Technical features:
Modular star topology is adopted, and the main network segments are independent of each other, which is convenient for network maintenance and expansion.
As the backbone of optical fiber, single-mode optical fiber cable is beneficial to the application of gigabit network and higher-speed network in the future. And through different jumpers, the networking mode is also very flexible. Can achieve:
(1) Point-to-Point: A high-speed channel is established between two computers. The transmission rate ranges from tens of Mbps to hundreds of Mbps, and the distance can reach 2km (multimode) to 5km (single mode).
(2) Logical star network: establish a fast Ethernet or ATM network with star network topology through optical fiber network equipment.
(3) Ring network: The signal regenerator is used to connect optical fibers to form a loop and form the FDDI backbone network.
All cables in the building adopt six types of unshielded twisted pair, which is cost-effective and convenient to construct. It can reach the data transmission rate of 1000Mbps and support 155/622Mbps ATM.
(4) The exchange is carried out on the second floor, which really supports plug and play without manual intervention.
Three. System design scheme
1. The goal of system design:
Meet the electronic processing of daily work, daily office automation, scientific leadership decision-making, and fast and convenient information exchange. That is, an advanced system to realize business system processing, daily office work, computerization of leadership decision-making and internationalization of information exchange. That is, with the help of advanced computer and communication means, an integrated computer network system is established, which connects the Internet vertically, connects various management subnets downwards and connects other units horizontally.
2. System requirements:
1. Establish a network system for information management and application based on campus network, and provide corresponding services.
2 * * * Enjoy all kinds of software and hardware resources on the network, transmit all kinds of information quickly and stably, and provide effective network information management means.
3. Adopt an open and standardized system structure, which is convenient for function expansion and technology upgrade.
4. Be able to connect with the outside world through the WAN, and provide and enjoy various information services (connect with educational information centers at all levels, and connect with famous websites at home and abroad ...).
5. Have a perfect network security mechanism.
6. Be able to connect the original computer LAN and application system smoothly, and call the information of various original computer systems.
3. System application platform
A network without an application system can only be a collection of various devices, not a real network, not what users need. Therefore, when the user does not specify the application system, our design should consider the traditional network application.
1. Online school management
1) school basic document management:
* Communication.
* meeting notice, meeting minutes
* Teaching hotspots (modernization of educational means, etc.). )
2) School system management:
* titles and abstracts of important documents (main points, themes)
* School management system, decisions made over the years.
* school planning, assuming
3) Management of important events in the school:
* School history and alumni records: important events facing the whole country and the whole city.
* Records of major events: arrangements and records of major school events.
Foreign affairs reception: reception, arrangement, recording and management of domestic and foreign visitors.
2. Online student management
1. Input and modification of students' basic information (mainly student ID cards and various forms that meet the municipal standards)
* Basic information of students at the time of enrollment: including political outlook at the time of enrollment, enrollment types, enrollment results, health status, etc.
* Basic information of students in school: including student ID card, name, native place, home address, photos, etc.
* Basic information of students leaving school: including political outlook, leaving school destination, health status, etc.
* Basic information of students' family members: including family relations, political outlook, work unit, etc.
Management of student status change: the change of student status caused by various reasons such as transfer, truancy and withdrawal. Can be effectively managed. The reason for the change can be recorded for future reference.
Students' basic information query: powerful query, which can arbitrarily combine multiple query conditions.
2. Student achievement management:
* You can set the examination courses and time of each grade class.
* Students' scores in various courses can be entered by academic year and semester.
* You can choose the input method (according to the original score or according to the score).
* Can manage compulsory courses, elective courses and senior high school entrance examination results.
3. Statistics of students' scores: various statistics are made on the input scores, and the statistical methods adopt standardized standards.
4. Print student reports: you can print various types of reports, such as: students' mid-term transcripts, final transcripts, class performance statistics, grade ranking table of total scores, etc. Used in various occasions.
5. Input, modify and print student comments: you can manage students' ideological and moral comments, conduct achievements, rewards and punishments records and other information, and print them into reports.
3. Class management:
It mainly completes the automatic arrangement of courses (compulsory courses and elective courses) and the management of students' Web course selection.
1. Manage the basic information of all courses. Automatic course arrangement under various conditions: it needs to deal with complex conditions such as venue, teachers and time.
2. On the basis of pre-scheduling, courses can be adjusted manually, and the software automatically handles various restrictions.
4. Output report:
Curriculum, teacher's curriculum, etc.
5. Course selection control management:
1. Whether to allow students to choose courses and manage the situation of each elective course.
2. Students choose courses online: Students choose courses on campus or at home through browsers.
3. Examination management: mainly completes the arrangement of examination room and invigilator.
4. It may be necessary to arrange the order of examination subjects.
5. You can ask for the specific time to arrange the examination subjects.
6. Time and frequency restrictions for invigilators.
7. Space is limited.
6. Teacher information management:
Manage the basic information of the whole school teachers.
7.Web general query system
Principals, teachers, students and their parents can inquire about management information (school affairs information, educational administration information, etc.). ) permissions, including:
1) school basic document information query
2) school system information query
3) Information inquiry of important events in the school
4) Student status information query
5) Students' grade information query
6) Course information query
7) Examination information query
8) Teacher information query
8. Information services
1. Build the campus information service system of the whole school intranet, and realize the online publishing of campus information, the e-mail system of the whole school and the sharing of online resource information. In this way, teachers and students can communicate on the campus network.
Multimedia reading room
2. A large number of learning materials and teaching reference materials can be put on the campus network in the form of multimedia CDs for all teachers and students to enjoy. The reading room function realized in this way will greatly save the time of teachers and students, so that teachers and students can also read the information in the CD at home and really enjoy the information.
9. Library management
1. data input.
2. Borrow books.
3. Query and retrieval.
4. Internal management of library work.