Analysis On The Sendan Company Computer Systems Computer Science Essay

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The name of the company where I am going to do my project is the Sendan Company which was established in the year 1992. It is located in the state of Befee-Tajura, Libya. It is distributor of beta quality tools here in Libya. It is one of the most successful and well known whole over the country in selling various kinds of hand tools and safety issues . I chose this business because it is highly demanded by many construction companies, oil field companies and also by local workshops and customers etc. We sales various kind tools of cutting tools, impact wrenches, reversible wrenches, torque wrenches, various type of pliers, hammers, safety boots, bib pants, overalls, safety jackets etc.

The problems which the company faced in the beginning were due to lack of modern or non advanced techniques which caused many inefficient during work hours.

The company building is of two floors i.e. ground floor which is used as both Beta slow room and resellers, and the 1st floor which is used as main office. The ground floor consisted of six computers and one printer for staffs. Where the 1st floor consisted of eight computers, one printer and one server. Two pc s for finance department, one for store incharger, two for assistance, one laptop for secretary, one for General Manager and the other is sever for Administrator department. The diagram shown below consisted of two LANs, one LAN on the ground floor and the other on the 1st floor. It is a diagram of same building having beta show room with resellers and the main office. The operating system using on all computers is Windows 7 except the main server is using Windows NT. The computers are connected with main server by using leased (dedicated) lines.

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BLOCK DIAGRAM OF CURRENT SYSTEM :

1.2) PROBLEM BACKGROUNG :

There are thirteen computers, one server, and two printers in the company. In the past years before the computers were inverted, staffs has faced many problems, i.e.

All calculations in the accountant department have to be done by staffs itself.

Keeping of all records also has to be done by staffs.

Making of invoice has to be done by staffs itself by hand writing which have no options of editing and erasing, even these huge amount of information may be lost.

New thinking and new technologies makes everything easy and efficient. So that the company starts coming forward and came with a new invention everyday and among that one of the greatest inventions by our invertors was the computer which solved all the problems of company's staffs and reduced the burden of their work and even saves time. In the beginning of the year 2000, the company purchases six computers and one printer in the ground floor (Beta show room) and eight computers and one printer in the 1st floor for office staffs (Main Office).

But the staffs still face problems i.e.

The staffs still unable to receive information from managing director.

Any software or updates of software and database has to be done many times on each computer.

The staffs of reseller still cannot get the information of the availability of items in the store directly. They used telephone line to know all this information.

Also for sending of pro-forma invoices, the staff uses transportation which is costly and time consumption.

These seems that the company's staffs still facing inefficient technologies and the cost for all the operations like using telephones, fax machines, printers are very high this will cause the company to suffer a lot.

Thus the company decided to make network system across the Show room and main office and I am going to do my project (Networking) in this company.

1.3) OBJECTIVES :

Following are the objectives of networking.

Sharing Information (data)

Through networking staffs are connected together, that means they can share any kind of documents or files they need. Instead of installing the same software or files on each computer, they can share that simply by installing it once on administrator's computer or server. This saves time and the cost to install on each computer. Through network staffs can easily send messages to any of his employee and can ask the employee to work on it.

Centralizing Administration & Support

Through networking administrator can control the working operation in the office. It is a centralized or head computer who can now keep an eye on each and every staffs working under him, He can pass orders and check the updates.

Sharing Hardware & Software

Through network staffs can share only one printer, fax machines etc. In the networked environment. This solves the problem of attaching device like printer to each individual computer which is much costly .

To Reduce The Cost & Budget:

By networking, the cost of all the devices used is reduced by using only one device instead of two or more. Now it is not necessary to use same devices in every room, but everyone can use only a single device. e.g. Printer.

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NETWORK ARCHITECTURE

2.1) TOPOLOGY AND DIAGRAM FOR LAN-1 AND LAN-2 :

SERVER BASED NETWORK WITH STAR TOPOLOGY IN 1ST FLOOR

PRINTER

ROUTER

HUB-1

TELEPHONE LINE

SERVER

Printer connecting to the server

Router connecting to telephone line

Server connecting to the Hub-2

Hub-2 connecting to the Router

Pc's are connecting to the Hub-2

Modem

Topology Used : Star Topology

EXPLANNATION :

In a server based network (1ST FLOOR), there are computers set up to be primary providers of services such as file service or mail service. The computer providing the service are called server and the computers that request and use the service are called client computers. In the 1st floor there are 7 client computers and one server.

A server-based network maintains the "server" as the manager of the network, with all nodes connected to the server, whether connected to a hub in a star or bus layout. In this way, the server can house and administer software, file sharing, file saving, allocation of printers, fax machines, modems, and other communication connections. A server-based network can also be set up using the bus layout.

The server acts as an arbitrator; each node talks to the server when requesting information, then the server locates the information either internally or on the connected clients and sends the information to the requesting client.

In the star topology, cable segments from each computer are connected to a centralized component called a hub. The diagram on the previous page shows eight computers including a server and a hub connected in a star topology. Signals are transmitted from the sending computer through the hub to all computers (clients) on the network. This topology originated in the early days of computing when computers were connected to a centralized mainframe computer.

The star network offers the advantage of centralized resources and management. However, because each computer is connected to a central point, this topology requires a great deal of cable in a large network installation. Also, if the central point fails, the entire network goes down.

If one computer-or the cable that connects it to the hub-fails on a star network, only the failed computer will not be able to send or receive network data. The rest of the network continues to function normally.

These eight computers in the main office are interlinked with hub-1 (3COM, 16 port hub), this floor is also provided with one printer and the topology used in this floor is star topology

PEER-TO-PEER NETWORK WITH STAR TOPOLOGY IN GROUND FLOOR

Workstation

Workstation

Workstation

HUB-2

Workstation

Workstation

Workstation

HUB-1 IS CONNECTED TO HUB-2 IN 1ST FLOOR.

TOPOLOGY USED : PEER-TO-PEER Topology

EXPLANNATION :

Peer-to-Peer network design uses only the computers that are connected, and does not rely on a server. Each computer has its own hard drive and, between each of the computers, you may have a CD ROM drive, a tape back-up system, an auxiliary hard disk, a data/fax modem, and one or more printers. Each node has the ability to talk directly to any node on the network that has the information or service it needs.

With this network type, we can optimize our usage of the various resources by sharing them within our network. The star layout works well with this type of network because all nodes are connected directly to the hub, making connections easy. A bus layout may also be used with this kind of network. In a peer-to-peer network, various computers on the network can act both as clients and servers.

In the ground floor there are six computers and one printer interconnected with hub-2 and the hub-2 is connected with hub-1 in the 1st floor which is server based network.

Selecting a topology

Star topology has been used with this network due to the following reasons:

Modifying system and adding new computers is easy.

Centralized monitoring and management are possible.

Failure of one computer does not affect the rest of the network

DIAGRAM FOR WAN :

2

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Workstation

Workstation

Workstation

HUB-1

Workstation

Workstation

Workstation

8

PRINTER

ROUTER

TELEPHONE LINE

SERVER

4

5

6

HUB-2

WAN

LAN-2

LAN-1

1

3

Modem

8

EXPLANNATION :

A Wide Area Network (WAN) has no geographical limit. It can connect computers and other devices on opposite sides of the world. A WAN is made up of a number of interconnected LANs. The WANs link computers to facilitate fast and efficient exchange of information at lower costs and higher speeds.

Computer connected to wide area network are often connected through public networks, such as the telephone system. Sometimes they can be connected through leased lines or satellites.

While LANs work well, they have physical and distance limitations. Because LANs are not adequate for all business communication, they must be able to connect between LANs and other types of environments to ensure access to full communication services.

Using components such as bridges and routers, along with communications service providers, a LAN can be expanded from an operation that serves a local area to encompass a wide area network that can support data communications statewide, countrywide, or even worldwide. To the user, the WAN appears to function like a local area network. When a WAN has been properly implemented, it appears indistinguishable from a LAN.

Most WANs are combinations of LANs and other types of communications components connected by communication links called "WAN links." WAN links can include:

Packet-switching networks.

Fiber-optic cable.

Microwave transmitters.

Satellite links.

Cable television coaxial systems

The above figure shows the structure of WAN, which is made up of two LANs. One is ground floor and the other one is main office (server based network). All the computers and printer in the ground floor are connected to hub-2 and the hub-2 is connected to the hub-1 in the main office. And all computers and printer in the main office is connected to the hub-1 in the 1st floor. The server in the 1st floor is connected to the hub-1. Then Hub-1 is connected to the router, then router connected to the modem and then finally modem to telephone line.

RECEARCH

NETWORKING AND INTERCONNECTED DEVICES