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LAN Topologies

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Introduction

Ricki Lambert Communications Technology LAN Technologies Introduction In this assignment I shall be looking at the various different network topologies. A topology is the way in which items are arranged. This assignment will cover three topologies, the bus, the star and the ring. The Bus The bus topology can work ideally with a maximum of 10 computers. The problem with the network is the sending of information. It is possible to send information from one computer to another, however when sending more than one piece of information at a time collisions will occur. The fundamentals of this mean that large networks would suffer information clashes. For example if computer A wished so send information to B then it would have to pass through every computer this is very slow. Also each end of the bus cable would need to be connected to a terminator (the bus is a coaxial cable). The terminator would prevent information bouncing between the two. ...read more.

Middle

* Easy to detect faults The disadvantages are, * Lots of cable is needed * If the hub goes down then the network will not function * It is more expensive than bus technology Ring The ring topology is very similar to the bus in the fact that it must pass through every computer, however it has a variation. The ring network will only pass in one direction, and it passes with the use of a token. The possessor has the token and will send it in the given direction to the recipient. This is called token passing. This is far more efficient as all data is sent in one direction, and only the holder of the token can pass it. The star is different because it is all separately linked; this means they can all send information at the same time in differing directions. For example, if A wanted to send information to B it firstly must possess the token. ...read more.

Conclusion

The bus compared to the star is very different. The star is singularly (per workstation) connected to a hub. This aids information flow but uses a lot more cable. The bus has less cable but is not as efficient. The problem with the bus system is errors in the cable. If there is one error with the cable all the workstations will cease to work. This compared to the star is a stark difference. Defects in cables will only affect the one workstation leaving the rest of the computers to function. A problem would arise when the hub tried to pass information to the workstation with the faulty computer. The ring topology is similar to the bus topology, it has to pass through every work station to work its way to its destination, unlike the bus however the ring sends a token. It sends the token and ensures that only one workstation can send information at a time. The problem with the bus is that when it sends information more than one at a time it will clash, when passing the token this is impossible. ...read more.

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