Presentation on theme: "Computer Science Project Communication and Network concepts."— Presentation transcript:
Computer Science Project Communication and Network concepts
Transmission media twisted pair cable coaxial cables optical fibers Microwave Radio wave Satellite Data communication terminologies.
Transmission media is also known as communication channels. They are the cables that connect two or mare workstations. Two categories: 1.guided media-include cables. 2.unguided media-include waves through air, water or vacuum.
Twisted pair cable Common form of wiring in data communication application. Voice grade medium(VGM)-basis for telephone wiring. Consists of two identical wires wrapped together in a double helix. Twisting of wires reduces crosstalk
Incapable of carrying signal over long distances due to high attenuation. Low bandwidth capabilities-unsuitable for broadband applications. max. data rates = 1 Mbps- without conditioning 10 Mbps with conditioning
Consists of a solid wire core surrounded by one or more foil or wire shields, each separated by a insulator. Inner core- carries signal Shield –provides the ground Suitable for high speed communication & widely used for TV signals. Types T hicknet-can be upto 500 meters long. They are thicker than thinnet Thinnet-using this cable max. distance of 185 meters can be joined.
Advantages Can be used as the basis for a shared cable network. Can be used for broadband transmission. Offer higher bandwidths- upto 400 MBPS. Disadvantage Expensive. Not compatible with twisted pair cable.
Consists of thin strands of glass or glass like material. Light source –LEDs or laser diodes(LDs). Bandwidth is very high. Fiber cable consists of three pieces: core Cladding Protective coating Types Single node Multi node
Immune to electrical and magnetic interference. Highly suitable for harsh industrial environments. Guarantees secure transmission and high transmission capacity. Can be used for broadband transmission where several channels are handled in parallel.
Installation problem- very fragile Connection looses are common problems. Cables are more difficult to solder. Light can reach the receiver out of phase. Virtually impossible to tap due to noise immunity. Most expensive.
TypeType Sub type Max.Seg ment Length Bandwidth supported installa tion costInterferen ce Twisted pair cable UTP STP 100 mts 100 Mbps 500 Mbps Easy moder ate Cheapest moderate High moderate Coaxial cable Thinnet Thicknet 185 mts 500 mts 10 Mbps Easy hard Cheap moderate Moderate Low Fiber optic cable Multinude Singlenode 2 kms 100 kms 100 Mbps 2 Gbps Very hard Expensive None
Guided media The different types of guided media are : 1.Microwave 2.Radio wave 3.Satellite The different types of other unguided media are : 1.Infrared 2.Laser
Micro wave advantages cheaper Freedom from acquisition rights and other governmental requirements Ease of communication Ability to communicate through oceans No use of cables
Radio wave Offers mobility Cheaper Offers ease of communication Freedom from land acquisition rights advantages Insecure communication Reduce signal strength disadvantages
Satellites advantages Area coverage is large Maintenance easy Can cover large areas of the earth Useful in sparsely populated areas c loses Disadvantag es High atmospheric loses High investment costs
Satellite disadvantages Over crowding of bandwidthsHigh investments costHigh atmospheric losses
other unguided media Infrared It uses infrared lights remotesautomotive Used in everyday life like remotes, automotive garage doors wireless speaker garage doors and wireless speaker Common in pdas Laser It is a line of sight transmission Point to point transmission It can be adversely affected by weather
A channel is the medium which is used to carry information or data from one point to another. It refers to the speed at which data transfer is measured. It is generally used to measure the speed of information through a high speed phone lines or modems.
Acknowledgement First and foremost, we would like to thank Kiran madam for having given us the opportunity for expressing our ideas through this project. We would also like to thank our friends for their creative ideas without which this would have been incomplete, last but not the least, we would like to thank everyone who directly or indirectly supported us.