Marks were assigned as follows.
Lab 1 Pre-Lab
Marked out of 3; 1 for each of:
- sum of digits
- samples/bit=8
- a C program that outputs two different values
Lab 2 Pre-Lab
Marked out of 3; 1 for each of
- a spreadsheet
- with 6 columns
- including name, value and units
Lab 3 Pre-Lab
Marked out of 3; 1 for each of
- your name in the code
- correct measurement loop termination condition
- correct Sleep(ms) function call
Lab 4 Pre-Lab
Marked out of 4; 1 for each of:
- Q1
- mean of triangle wave
- rms voltage of triangle wave
- Q2: RMS voltage
- Q3: number of levels
Lab 5 Pre-Lab
Marked out of 6; 1 for each of:
- identification including name, lab, & date
- Q1: correct bit rate (9600 bps)
- Q2: difference=0
- Q2: gain=5x
- C program
- C program has 2 loops (one for characters, one for bits)
Lab 6 Pre-Lab
Marked out of 5; 1 for each of:
- MAX 232 schematic including 4 capacitors
- function of charge pumpt is to increase and invert supply voltage
- maximum slew rate is 30V/us
- 3486/3487 schematic showing enables tied high
- rise time >20ns; maximum bit rate is 5 MHz
Lab 8 Pre-Lab
Marked out of 4; 1 for each of:
- correct amplituder
- correct phase increments
- correct samples/bit
- reasonable C code
Lab 9 Pre-Lab
Marked out of 1; 1 for each of:
Lab 10 Pre-Lab
Marked out of 4; 1 for each of:
- top-level protocol (1)
- display only packets matching filter expression (1)
- click on '+' or '-' (1)
- bottom window (1)
Lab 1 Report
Marked out of 5; 1 for each of:
- identification including name, lab, & date
- correct bits and voltage levels
- in the form of a table
- 'scope screen capture
- Audacity screen capture
Lab 2 Report
Marked out of 6; 1 for each of:
- 2 minus 1 for each incorrect "guess" during the lab
- identification requested
- a table with 5 or more columns
- reasonable value for Capacitance per meter
- reasonable value for Characteristic impedance (Zo)
Lab 3 Report
Marked out of 8; 1 for each of:
- identification including name, lab, & date
- corrected C code (full listing)
- plots of magnitude and phase response, correctly formatted (2 marks)
- answers to the 3 questions (3 marks, 1 each question)
- spreadsheet (submitted to the dropbox in Excel format, not just the data or just the graph)
Lab 4 Report
Marked out of 10; 1 for each of:
- CSV, Excel and PDF files (3 marks)
- identification including name, lab, & date
- plot of first 2000 samples
- 3 histograms (3 marks)
- table comparing RMS values from DMM and computed from samples
- computed results that match measurements
Lab 5 Report
Marked out of 4; 1 for each of:
- identification including name, lab, & date
- Teraterm & 'scope screen captures (2 marks)
- updated C code
Lab 6 Report
Marked out of 6: (missing result: -1, suspicious results: -0.5)
For RS-232:
- - mark/space volages ~+/-10V: 1
- - output impedance >700ohm: 1
- - slew rate <30V/us: 1
For RS-422
- - independent screen captures: 1
- - differential screen capture (should be +ve and -ve): 1
- - measured a higher bit rate: 1
Lab 7 Report
Marked out of 5; 1 for each of:
- schematic
- spreadsheet with approximately correct measurements
- spreadsheet with approximately correct predictions
- plot of BER vs SNR
- plot of noise
Lab 8 Report
Marked out of 4; 1 for each of:
- identification
- program listing
- TeraTerm screen capture with output matching code
- 'scope screen capture
Lab 9 Report
Marked out of 3; 1 for each of:
- identification
- schematic
- correct simulation screen capture
Lab 10 Report
Marked out of 5; 1 for each of:
- identification
- IP address of gaia.umass.edu
- captured packet
- number of bytes in header
- destination IP address is constant
Assignment 1
Marked out of 4; 1 for each of:
- Q2: 0627
- Q3: 3 bytes,
- Q3: E7 8C B4
- Q4: 4C2
Assignment 2
Marked out of 5; 1 for each of:
- Q1(e): Zo=74 Ohms
- Q3: length ~= 560m
- Q4: a correct equation
- Q5(a): correct equation
- Q5(e): correct equation
Assignment 3
Marked out of 11; 1 for each of:
- Q1: 1 for each correct waveform (total of 3)
- Q2(a) approx. 1 kHz
- Q2(c) approx. 1 kHz
- Q2(e) approx. 0.2 dB
- Q3(a) 3dB (2)
- Q4 1 mark for 2 impulses, 1 mark for delays of 2 & 3 km (or 10 and 15 us)
- Q5(a) 0.25
- Q5(b) 5%
Assignment 4
Marked out of 9; 1 for each of:
- Q1a: pins 3,6
- Q1e: RI and DCD
- Q2: for AT
- Q3: 1 each ffor 2X, ~1.4X
- Q4: 1 each for 8kHz, 56kb/s
- Q5: 1 each for 30.72MHz, 1.4km
Assignment 5
Marked out of 12; 1 for each of:
- Q2:
- 500 ohm resistor in series
- 125 ohm resistor in parallel
- Q4:
- flags
- correct bit stuffing
- Q5:
- Manchester symbols
- correct encoding
- Q6:
- (d) Dmin = 4
- (e) detect Dmin-1
- (f) correct floor((Dmin-1)/2)
- (i) cannot correct or either codeword
- Q7:
- CRC length = 4
- CRC = 0111
Mid-Term Exam
One mark was awarded for each of the following:
Q1:
- one mark for each correct answer
Q2:
- converting gauge to mm
- using the correct equation for Zo and
- using correct value for epsilon_r
- the right answer
Q3:
- start and stop bits of correct polarity
- for correct bit values in the correct order
- correct bit polarities
- correct value & polarity of parity bit
- answers to questions (No, No)
Q4:
- one mark for each correct answer
Final Exam
Marks were awarded as follows:
- Q1: 1 for 2 bytes, 1 for each value
- Q2: 1 for axis labels, 1 for start and stop bits, 1 for bit order and polarity, 1 for parity
- Q3: 1 for wavelength, 1 for Friis equation, 1 for received power, 1 for power in dBm
- Q4: 1 for -6dB bandwidth, 1 for alpha, 1 for max symbol rate
- Q5: 1 for flags, 1 for stuffed bit, 1 for other bits
- Q6: 1 for value of t, 1 for probability of less than 3V, 1 for probability > 3V
- Q7:
- (a) 1 for k, 1 for k/n
- (b) 1 for selective repeat
- (c) 1 for detect 3, 1 for correct 1
- (d) 1 for 10BaseT
- (e) 1 for TDMA or FDMA, 1 for CSMA
- (f) 1 for netmask