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Digital Communication System Essay Example

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Digital Communication System

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Digital Communication System. Our computer sends these packets to the local area network or Internet Service Provider (ISP). The packets then travel through many levels of networks, computers and communication lines before the final destination which could be anywhere in the world. A variety of hardware and array of network layers process these packets. Five of the most important pieces of hardware are:REPEATERS: The signal travels large distances across networks. While traveling, the data is vulnerable to get lost or signal might weaken. To prevent this from happening or to recover weak signals repeaters are used at regular intervals to amplify signals.ROUTERS: Routers ensure that data packets reach their respective destinations.

Routers aren’t needed for data transmission between same LAN. They are usually required for communication between different networks.Step 1: Internet is a packet switched network. Information across the internet is broken down into small packets. Breaking the data into packets, routing packets across internet (done by IP) and recombining them at the other end (done by TCP) comprise the first step.Step 2: The packet size should be limited because of various reasons including limited hardware capacities. Each packet is given a header that contains a variety of information such as the order of packets. As TCP creates each packet, it calculates and adds to the header a checksum, which is a number used at the receiving end to determine error occurred during transmission.Step 3: Each packet is put into separate IP network which contains the addressing information that tells the internet where to send the data. Envelopes for given data have same addressing information for ease of reassembling at receiving end. Every IP address consists of four numbers separated by periods called dots.Step 4: The DNS (Domain Name Server) is used to convert textual internet address into IP numeric equivalent. DNS establishes a hierarchy of domains, which are groups of computers on the internet. Domain name and hostname consist of information about host computer, information about organisation which identifies the recipient network and the specific email box.(Gralla et al, 1998) Modem: It basically carries out modulation and demodulation of outgoing and incoming signals respectively. It takes data from PC and transfers it to the telephone line. Modulation is carried out to enable data compatibility while travelling on. Digital Communication System.

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Reference

Model, Available from: buzzle.com < http://www.buzzle.com/editorials/8-24-2004-58325.asp> [24 March, 2009]

Knuden, J 2007, Best Ways To Improve Internet Speed, Available from: <http://www.articleclick.com/Article/Best-Ways-to-Improve-Internet-Speed/942150> [25 March, 2009]

Chandler, K, Top tips to improve your internet connection! How to squeeze the most from your modem, Available from: <http://www.practicalpc.co.uk/computing/comms/speedup.htm> [25 March, 2009]

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