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:

• a reasonable schematic

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