(*Small and medium-sized LAN construction: network construction design and scheme of XX company *2001 grade electronic information engineering Jinxuan student number: 2001714012* I. demand analysis *1.1 background: * there are three buildings, No. 1, No. 2 and No. 3, and the straight-line distance between each building is 100 meters* Building 1: three floors, administrative office building, 20 computers, scattered* Building 2: the fifth floor is the product R & D department and the supply and marketing department, with 30 computers. Among them, 20 are concentrated in the design room of the R & D department on the third floor, with a special computer room, and the other 10 are scattered. Here, it is required that the computers of the supply and marketing department can be connected to the Internet, and the information of the products produced by the unit can be released to the Internet, and the rest can not be accessed to the Internet* Building 3: the fifth floor is the production workshop. There is one workshop on each floor. There are 3 computers in each workshop, a total of 15* 1.2 future development: * in the next 3-5 years, the number of unit computers will increase to about 150, mainly in the R & D Department of Building 2. It is planned that the Department will add two special computer rooms for the R & D and design of new products* 1.3 user demand analysis: * in order to better integrate the company with the development of modern society, obtain market information faster and let the outside world know the relevant information of the company, an enterprise network is specially established to realize the computer network management of "company file management", "product information", "supply and demand information", etc* 1.4 network function: * the network established according to the company's existing scale, business needs and development scope has the following functions: *a) establish the company's own website, which can release information to the outside world and conduct business on the network* b) The supply and marketing department is required to be able to connect to the Internet, keep in touch with enterprises, accept orders and release product information of the company. No other department can connect to the Internet, but the internal network connection of the company is required* c) The internal network of the company realizes resource sharing to improve work efficiency* d) Attention should be paid to the expansibility of the network when establishing the network, so as to facilitate the network upgrade and the addition of computers in the future* e) Establish the company's internal database, such as employee files, business plans, meeting schedules, etc.
2、 Network structure design *2.1 site survey and analysis: * according to the structural characteristics of the company building, a detailed network connection diagram is prepared, including the following information: *a) the distribution map of information electricity (i.e. office points) on the network, the size and distance of the workspace *b) the location of the power socket, Equipment including sockets currently in use *c) the location of all immovable items (such as support columns, partition walls, built-in cabinets, etc.) *d) the current location of all office furniture *e) the location of all external equipment of computers and similar printers *f) the location of doors and windows * g) the location of ventilation ducts and current wires * in addition, a configuration table shall be established for each equipment when recording each equipment, such as computer CPU and hard disk, Monitor, floppy drive* 2.2 access Interner mode: *a) DSL broadband access, including ADSL, CDSL, HDSL, IDSL, UDSL, etc. typical ADSL is asymmetric digital subscriber line. ADSL is generally considered as one of the access technologies with broad application prospects* b) The special line access is mainly adopted by enterprise users. DDN (digital data network) mode is commonly used for special line access. The speed range is 64Kbps to 2Mbps. With DDN, the network equipment needs a router, NTU, baseband modem or HDSL* It is recommended that the company rent a dedicated line to connect with the outside world and use a computer with advanced configuration as the server.
Detailed list of DDN leased line rental fees:
rate
Initial installation cost (yuan / piece)
terminal equipment
Monthly line rental fee
Information flow fee
Within the area
section
DUT2603
PAIRGAIN
Within the area
section
64K
*2810
*2860
6500 sets
two
one thousand and five hundred
two thousand
four thousand
128K
two thousand
two thousand and five hundred
five thousand and four hundred
256K
8000*2
two thousand and five hundred
three thousand and two hundred
seven thousand and three hundred
384K
three thousand and two hundred
four thousand
nine thousand and nine hundred
512K
three thousand and eight hundred
five thousand and two hundred
one hundred and thirty-three thousand
768K
four thousand and three hundred
six thousand and two hundred
one hundred and eighty thousand
1M
five thousand
seven thousand and five hundred
two hundred and forty-three thousand
2M
six thousand
eight thousand
three hundred thousand
2.3 network interconnection mode: * firstly, the network topology should be determined. It is recommended to adopt the star structure, in which the fast Ethernet of 100Base-T star structure is the ideal choice. Twisted pair is used as the transmission cable. The physical structure of the star bus network adopts star connection, and the logical structure adopts bus. IEEE 802.3 protocol standard is adopted. The network card, hub and twisted pair shall be 100m. When users expand too much, stackable hubs can be used* Then determine the interconnection mode. Because some users can connect to the Internet and the other cannot, there are two ways: *a) divide into two subnets, connect one switch to each and connect to different network cards of the server. Set one network card on the server to connect to the Internet and the other not.
b) It is divided into three subnets, all of which are connected to the router. IP is set on the router. The IP of two subnets is set as internal IP, and Internet access is not allowed.
*L it is suggested to use the second method to expand the network in the future.
3、 Cabling system design * generic cabling shall conform to the cabling system required by building management automation, office automation, communication automation, computer networking and other multi-functional requirements. The system shall be able to support voice, image, graphics, data multimedia, security monitoring, sensing and other information transmission, support optical fiber, unshielded twisted pair (UTP), shielded twisted pair (STP), coaxial cable and other transmission carriers, support the application of multi-user and multi type products, and support the application of high-speed network. Generic cabling system usually includes six subsystems: work area subsystem, Horizontal Cabling subsystem, trunk subsystem, equipment room subsystem, management subsystem and building group subsystem* The design of generic cabling system shall be determined according to the building structure and user requirements. This process mainly includes the following points: *a) try to meet the communication requirements of users *b) understand the communication environment inside the building *c) determine the appropriate communication network topology *d) select the transmission medium to be used *e) based on the open mode, try to be compatible with the products and equipment of most manufacturers, Design according to common standards *f) cost estimation of preliminary design of the system *g) inform the user of the preliminary design and construction cost budget of the system *h) finally, after obtaining the user's opinions and signing the contract, formulate a detailed design scheme * UTP, STP or optical cable can be used for generic cabling. The shielded system is the mainstream in European generic cabling, while the unshielded system is widely used in North America, In the case of high-capacity backbone and serious interference, optical cables are used as shielding systems. However, if the STP shielded system is used improperly, it will not achieve the integrity of the overall shielding, and its performance will be worse than that of the UTP system. UTP is a relatively mature and reliable cable used in the generic cabling system of commercial buildings at present. It can also meet the use requirements in interference environment under normal circumstances. Therefore, it is recommended to use UTP or optical cable* There are usually three ways of wiring inside the building: wall, roof and floor. There are two choices of wiring: open line and dark line. When the wiring room or walkway is narrow and the floor height is low, it is better to select open line and use PVC trunking to walk on the wall. The cost of using open wire is low, and using dark wire is not only expensive, but also requires a roof, a floor or a interlayer, but it is more beautiful. If the height of the room allows, you can choose a roof or a floor. The floor is more expensive but easy to maintain. If the width of the room allows, you can use dark lines through the wall. Making mezzanine for the wall can make the wall beautiful and easy to maintain. The three methods can be used in the floor aisle, but it is recommended to use the floor erection method in the rooms with concentrated stations, which will make installation and maintenance more convenient* It is recommended to set the main machine on the third floor of Building 2. The underground pipeline laying method is adopted among the buildings, and the outdoor 12 core multimode optical cable is laid in the pipeline. At least 1~2 spare pipe holes shall be reserved for expansion during installation. Optical cable transceivers shall be placed in buildings 1 and 3 to ensure normal signal transmission. In order to save money, twisted pair is used for indoor connection. Four pairs of twisted pair are used for horizontal systems on the same floor. The cable length should be within 90m. The vertical trunk subsystem is always located between vertical weaknesses, and large pairs of twisted pair are used.
4、 Equipment matching and determination software * recommended server configuration (assuming that the company already has other computers): * & amp; Oslash<imgsrc="static/image/smiley/default/titter.gif"smilieid="9"border="0"alt=""/>entiumMMX350CPU*& amp; Oslash; 128MB ram * & amp; Oslash; SVGA (cirruslogic5446pci) display card *& amp; Oslash; 40Gb and SCSI interface hard disk *& amp; Oslash; A 3.5-inch and high-density floppy disk drive and a CD-ROM drive * network card, using a 10/100m adaptive full duplex network card * switch, using a 24 port switch. If it is expanded in the future, it can be added to the hub, and the additional users can be connected to the switch through the hub* The network cable uses cat 5 unshielded twisted pair * rj-45* information socket for network connector, amp dual port information socket panel * the server operating system is recommended to use windows2000server for ease of use)
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