Assignment. 04 SEMESTER FALL2008 CS601- Data Communication Total Marks: 20 Due D
ID: 3608128 • Letter: A
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Assignment. 04 SEMESTER FALL2008 CS601- Data Communication Total Marks: 20 Due Date: 05/01/2009Instructions Please read the following instructions carefullybefore submitting quiz: It should be clear that your assignmentwill not get any credit if: o The submitted file does not open orfile corrupt. o Write answers on this file. Don’t use anyother file format. o Not mentioned the student Id in the assignmentFile or name of file is other than student ID. Note: For any queryabout the assignment, contact at cs601@vu.edu.pkGOOD LUCK Marks: 20Q# 01:- A 56K Modem gives us the maximum uploading rate of 33.6Kbpsbut maximum downloading rate is 56 Kbps from an ISP. Why is thereso much difference in uploading and downloading rate? Is there someway to increase the uploading speed as well? [5] Q # 02: Finddownloading speed of Cable modem if 32QAM demodulation techniqueused? [5] Q # 03:- What are the light sources for optical fiber?[10] Deadline Your assignment ( From Lecture # 23 to 28) must beuploaded / submitted before or till due date.Explanation / Answer
//Hope this will help you.. //Don't forget to rate thisanswer.. Ans 1. when we download from 56k modem, data is changing from a digitalsignal to an analog signal. Digital-to-analog conversions are perfectly accurate, sodownloading at speeds up to 56K is possible. While uploading, datais changing from an analog signal to a digital signal.Analog-to-digital conversions are imperfect, so noise is introducedinto the signal which in result decrease the band-width foruploading. Ans 2. The downloading speed of cable modem for 32 QAM is 1280 kbps ( TDMA) Ans 3. Single-mode fibers, ones with smaller cores uses infraredtransmitted from laser light. Multi-mode fibers, ones with larger cores uses infrared transmitedfrom LED.
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