Investigate Data Communications.
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Communications & Networking Investigate Data Communications Unit 3 Element 3.1 Assignment 1 By Nicky Wilson GNVQ Advanced IT Action Plan 25-4-95 27-4-95 Received assignment which is to cover element 3.1 all PCs. My initial task is to gather all relevant information on telecommunication authorities, the types of connectivity and network services. I will research through the books A level BTEC First degree computing , the book Data and Computer Communications as well as to search through the CD ROM on Groliers Encyclopedia. As well as lecture notes. Take notes on any relevant information 27-4-95 1-5-95 Research information on the devices and modes of data communications. research through above books and CD ROM's and take relevant notes. 1-5- 95 4-5-95 Find out about devices and modes of data communication, look through magazines in resource center and various pc magazines for relevant Information, as well as above literature. Take notes on relevant information. 4-5-95 6-5-95 6-5-95 9-5-95 9-5-95 10-5-95 Research information on data communications protocol parameters, by above literature make notes. Make notes on the use of data communications and network services, analysing them to determining devices, modes of data communications, transmission rate and protocol parameters. Word process first draft, and take to tutor for first review 10-5-95 - 12-5-95 After outcome of first review take tutors advice accordingly. 13-4-95 - 17-4-95 Make sure to check work to see if any important facts have been omitted, ask Tutor for a second review. After outcome of second review finalise any missing facts. Word process final draft, check the work for mistakes and hand in finished report for the 19-5-95 Bibliography KNOTT, G (1993) A level, BTEC & First Degree Computing WAITES, N Business Education Publisher ltd 1990 STALLINGS, W (1993) Data & Computer Communications, Third Edition Macmillan Publishing Company 1991 PC USER February & March 1995 GROLIERS CD ROM ENCARTA 95 LECTURE NOTES S.M.H. COLLINS (1988, 1994)
Shown below is typical characteristics for guided media. Point to point characteristics of guided media. Transmission media Total data rate Bandwidth Repeater Spacing Twisted pair 4mbps 250khz 2 - 10km Coaxial cable 500mbps 350mhz 1 -10km Optical fiber 29bss 2Ghz 10 -100km Two Wire Signal 1 = -12v RS232C Ground (av) 0 = +12v The cheapest type of cabling is Two Wire, this is typically used for DCE - DTE, maximum distance is 50 meters, with a speed of 20kbps, if any faster you may get cross talk, the interference may be on one side Twisted Pair A twisted pair consists of two insulated copper wires arranged in a regular spiral pattern, a wire pair acts as a single communications link, a number of these pairs are bundled together wrapping them in a tough protective sheath, over long distances they may contain hundreds of pairs. The wires in a pair have thickness from 0.016 to 0.036 inches. Speed will go up to 1mbps - 200ms. It is by far the most common transmission medium for both analog and digital data, it is the backbone of the telephone system as well as the workhorse for interbuilding communications Coaxial Cable Coaxial cable like twisted pair consists of two conductors, but is made differently to allow it to operate over a wider range of frequencies. It consists of a hollow outer cylinder conductor that surrounds a single inner wire conductor. The inner conductor can be solid or stranded, the outer either solid or braided. The inner conductor is held in place by either regulated spaced insulating rings or a solid dielectric material. The outer conductor is covered with a plastic shield. There are two main sizes 1/4 and 1/2 inch. Coaxial cable transmits at 10 - 20 mbps. Coaxial cable perhaps has the most versatile transmission medium and is enjoying increasing utilization in many applications, the main ones are * long distance telephone and television transmission * Television distribution.
Microland is connected to the Internet, and provide full global mail, news, software archive and interactive services. There are many more bulletin boards about which offer these services. Evaluation I am satisfied with the outcome of the assignment, I feel that I have covered the criteria and the range that was required. The way I approached the assignment was as such, first of all I researched information from the books, A level BTEC and first degree computing. The magazines PC User Feb & March Issues 1995, Groliers Encyclopedia, Encarta 95. I also used Lecture notes and other books the Dictionary of computing and Data Communications. The next process was to decide which way, was the best way to try and cover the Pc and ranges for the unit. Eventually I decided that it would be easier to work through the Pcs in order thus starting at Pc 1. The other way I thought of approaching the assignment was to gather information on the analysis stage which was the last Pc. The reason why I didn't do it this way was because I felt that it would be better for me to do the other Pcs first because when they were completed, I could spend more time on the final Pc. The way that I tried to checked the validity of the Information was by, trying to compare the information that I had it with the different books. magazines and CD ROM's to see if it was correct. I also asked my wife to read through my work and make any constructive remarks, which she did, by saying rather sarcastically "What an interesting piece of work " I have done the work as instructed on my action plan, and kept to the dates that were stated for reviews, so all in all I feel that I have completed this assignment in accordance with my original action plan. If any criticism is to be applied to my work, I could have explained a little more on the analysis stage, but overall I feel happy with my report.
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