1 7 SP1 Assignment 2 1 of 10 Due : 11:59PM, Sunday 1 4 th M ay 20 1 7 RMIT University School of Computer Science And Information Technology Cpt - 250 Data Communication and Net - Centric Computing Assignment #2 Study Period 1 , 201 7 1 7 SP1 Assignment 2 2 of 10 Due : 11:59PM, Sunday 1 4 th M ay 20 1 7 Warning regarding Plagiarism All answers must be your own original work. You mus t complete this assignment on your own, and the answers you submit must be your own work and in your own words. You may discuss the problems with others , and on the discussion board, but any answers that share substantial commonality with those of other st udents will be considered plagiarism. Direct quotes are not permitted and quotes from the lecture material are also not permitted. All answers must be in your own words. All ideas must be properly referenced – so you must understand and summarize all exter nal sources. You must not provide nor show your answers to anyone, and you must not discuss details of your answers in person or on the discussion board. You are responsible for the security of your work. This means not allowing anyone else access to you r computer files, papers, printouts or disks. Remember that plagiarism and other forms of cheating are considered serious academic offences, which in turn have academic penalties. Computer Science & Information Technology now routinely uses plagiarism dete ction software on electronically submitted assignments. The minimum penalty for plagiarism is loss of marks for assignment. If this means that a hurdle requirement is not met, it could result in failing the course. Please be careful. Introduction and O bjectives of Assignment 2 This assignment covers all aspects of Data Communication and Net - Centric Computing. This assignment has 75 marks and is worth 20% of your final score. Include workings in all your answers. Partial credit may be given for appropr iate calculations, even where your final answer is incorrect. Due Dates and Assignment Submission This assignment is to be completed by each student individually and independently. The final version of your Assignment #2 is to be submitted electronically using B lakboard on or before Sunday M ay 1 4 th 201 7 (11:59pm) . You should submit a single PDF file which includes, on every page, a one - line header or footer giving your name, student 1 7 SP1 Assignment 2 10 of 10 Due : 11:59PM, Sunday 1 4 th M ay 20 1 7 The first question asks you to cons truct a f ormula for Pa cketisation d elay . a) Let the payload of a cell/packet be P bytes. Consider a digitally encoded voice source en coded at a constant rate of 64 k bps. Assume each cell /packet is entirely filled before the cell /p acket is sent into the network. Derive a formula for calculating the packetis ation delay in milliseconds , i n term s of P. When streaming data that is time - sensitive like voice , it is kn own that gaps in the transmissi on of 20m s or more ca use a notic e able and unple asant echo. With this in mind , let ’ s compare the packetization delay of small and large ce lls/packets. b) Use t he formula derive d in part ( a) to d etermine the packetization delay for ; i. P =1,500 bytes (roughly corresponding to a l arge Ethern et packet payload ) ii. P =5 0 bytes (corresponding roughly to an ATM cell payload ). Next, we use the formula for Trans mission delay to compare that d elays for small and la rge cells/packet s. c) A transm ission link has a data rate of R=155 Mbps. C alculate the transmission delay for i. L=1 , 500 bytes ii. L=50 bytes. d) Comment on the advantages of using a small ATM cell. Marks 16 End of Assignment