A. Encoding and decoding signals

Note: Handdrawn plots will get 0 marks. You need to embed screenshots of yourplots and include the links generated by sharing your solution from theDesmos online graph plotting tool (as introduced in the lab andavailable at: https://www.desmos.com/calculator). Since group work isnot permitted, we expect each student to submit a different link! Youcan access your individualised assignment parameters on Moodle.

1. Modulation – Analog signals

Youneed to download your individualized assignment parameters from Moodle.They contain two sets of encoding tables and encoded signals, A and B. For each of these, do the following:

a) Identify the type of encoding (FM, AM, PM, or combinations of these) and the size (in bits) of each symbol in the encoding.

• b) Draw the constellation diagram for the encoding (except if the encoding is FM).
• c) Draw the wave form for each symbol.
• d) Demodulate the given signal (i.e., give the bit sequence that it represents).

2. Digital encoding

The bit sequence C needs to be transmitted as a digital signal. Design an encoding, state the encoding rules (as a table), and plot the digital signal for the encoding schemes below.

• a) bipolar non return to zero inverted (NRZI)
• b) Manchester encoding

B. Technical Report

Basedon the scenario you find below, you are to write a technical report forthe senior executive of the company you work in, evaluating differenttechnologies to meet the company’s networking requirements.

Therest of this specification is organised into two parts: 1) the scenario,which explains the situation of the (imaginary) company you work for,and 2) the instructions how you should approach this task.

1. Scenario

Your role / company overview: You work in the IT department of DataAnalytics.AU,a start-up company that was spun out of Monash University with around20 employees in Melbourne. The company is offering data analysisservices, where customers can upload large data sets and accesscustomised visual analyses through a web site.

Your company isgrowing fast, and the plan is to move into new offices within the nextfew months. You were hired as a user interface specialist, but when theCIO (Chief Information Officer) found out that you did FIT9135 as partof your Master’s degree, she gave you the task to design the networkinfrastructure for the new offices.

2

Network requirements:

• Upto now, the company was operating its own web server in a Monash datacentre. The projected growth in customers and staff means that adedicated, more powerful server will be required. The company isconsidering hosting its own servers or paying for an “on- demandcomputing platform” such as Amazon Web Services, DigitalOcean, Linode etc.
• Thenew office space is located in an old warehouse, and you need to decidewhat kind of local network infrastructure should be installed. Inaddition to potentially supporting the company servers, the localnetwork infrastructure needs to support a dynamic work environment,where staff don’t have assigned offices but move around with theirlaptops to work in small groups.
• The new office space needs to be connected to the Internet.

Your task:

Forthe first requirement, your task is to do some research on theadvantages and disadvantages of hosting your own server versus usingonline services. The second and third requirements are linked to thefirst one. If the company decides to host their own servers, that mayhave an impact on the required local network infrastructure and Internetconnection.

Research and analysis expected in the report:

• TheCIO wants to be informed about the options at a technical level.However, they expect you to give them enough arguments to also convincetheir investors, in particular with respect to costs and benefits of any new technology.
• Gointo some technical detail to explain differences between technologies.It will be useful to create tables for some of the comparisons. You cananswer questions such as

oWhatdevicesareinvolvedineachoptionandwhataretheirfunctions? o How doeshosting your own servers compare to online platforms in terms ofscalability,

reliability, and up-front versus long-term costs? oWhatkindof(wiredandwireless)networktechnologyshouldbeinstalledinthenewoffice

space in order to facilitate the mobility of the staff? o Whatare the available upstream and downstream capacities of differentInternet

providers? Is the technology scalable and future-proof, i.e., can we buy more capacity later without investing in expensive new hardware?