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DESIGN AND CONSTRUCTION OF COMPUTER NETWORK TESTER

DESIGN AND CONSTRUCTION OF COMPUTER NETWORK TESTER

ABSTRACT

This project is titled the design and construction of a computer network tester. It is designed to meet up with the safety and accuracy demand in flow of signal in computer network.
It is design to detect If the cable carries the signal, this indicates that all the circuits are closed, meaning that electric current can move unimpeded through the wires, and that there are no short circuits, or unwanted connections, in the wire. A network cable tester can identify if the wires are paired correctly. It can also show if there is a break in the insulation, a situation which allows crosstalk between two wires that should not be connected. The tester can also tell whether the cable has the proper level of resistance.
This project was designed for confirming the continuity and correct wiring of computer network leads which have 8 wires, but it can be used to check any lead with up to 8 wires by using appropriate connectors.

CHAPTER ONE
INTRODUCTION
1.1                             BACKGROUND OF THE STUDY
The idea behind the design and construction of this system is to make available or alternative means providing safety and accuracy demand in flow of signals in computer network. This goes a long way in helping to curb the problem frequently encountered as a result of open circuit and unwanted connection, in the wire.
When connected to an Ethernet cable, a network tester tells if the cable is capable of carrying an Ethernet signal. If the cable carries the signal, this indicates that all the circuits are closed, meaning that electric current can move unimpeded through the wires, and that there are no short circuits, or unwanted connections, in the wire. Network cable testers vary in complexity and price, but a basic tester consists of a source of electrical current, a measuring device that shows if the cable is good, and a connection between the two, usually the cable itself.
Computer networks use Ethernet cables to allow computers in the network to “talk” to each other. An Ethernet cable has eight wires that are arranged in four pairs. For current to flow correctly, the wire pairs must be connected in the proper order.
A network cable tester can identify if the wires are paired correctly. It can also show if there is a break in the insulation, a situation which allows crosstalk between two wires that should not be connected. The tester can also tell whether the cable has the proper level of resistance.
If a network isn’t working correctly, the problem is frequently user error or other problems. It will rarely be a faulty cable. A network cable tester is more frequently used to tell whether a patch cable will work before it is connected. The cabling should first be examined visually to identify any obvious problems. If everything looks correct, a network cable testing device may then be used.
A network tester is a simple apparatus that merely identifies whether current flows through the cable, or it may be a professional-level, complex device that gives additional information that helps identify the problem. Professional-level network cable testers may not only tell if an open circuit exists, but may identify where the break is located. Some also identify the gauge of wire used and can generate their own signal to test for interference.
Basic network testers can test for simple connectivity issues but may not identify other problems that cause the cable to malfunction. Cabling may not work when it is near a source of interference or if the cable is too long. Intermittent faults may develop that do not show up when the cable is tested. Sometimes the problem is not sustained long enough to show up on the tester.
1.2              OBJECTIVE OF THE STUDY
The objective of the study which should be understands to be the purpose or the aim of designing and constructing a computer network tester.
The purpose of this work is to design and construct a device that can be used to identify if the wires are paired correctly. It can also show if there is a break in the insulation, a situation which allows crosstalk between two wires that should not be connected, which can  also tell whether the cable has the proper level of resistance.

1.3                                SIGNIFICANCE OF STUDY
A computer network consists of a group of computers and devices interconnected by communications channels, facilitating communications among multiple users. Computer networks make it possible for users to share multiple resources and access shared files. A hardwired network connection provides more secure and stable connections, transferring data directly. As with most computer connectivity, special tools are required to build a successful computer network.
1.4                            STATEMENT OF PROBLEM

Several studies have shown that the majority of network performance problems occur in or near the users’ desktop/laptop computer.  These problems include, but are not limited to, duplex mismatch conditions on Ethernet/FastEthernet links, incorrectly set TCP buffers in the user’s computer, or problems with the local network infrastructure.  The work is designed to quickly and easily identify a specific set of conditions that are known to impact network performance.  A multi-level series of plain language messages, suitable for novice users, and detailed test results, suitable for a network engineer, are generated and available to the user.  Finally, the test results may be easily emailed to the appropriate administrator to assist in the problem resolution phase.
Another problem is the inability of the testing personnel to use the instrument accurately. When these tester is not used accurately that means that an incorrect result is expected to be seen.

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