The numbers in parentheses indicate the number of marked items (1 mark each).

Pre-Labs

Pre-Lab 1 (3)

• sum of digits
• period
• a reasonable attempt at a C program

Pre-Lab 2 (4)

• correct title, etc
• RMS voltage calculation (3.1V)
• probability density function (two impulses with values 0.3 and 0.7)
• step size (~2mV)

Pre-Lab 3 (2)

• spreadsheet printout
• with formulas

Pre-Lab 4 (3)

• C program
• high/low levels
• baud and sample rates correct as per student ID

Pre-Lab 5 (3)

• original MAX-232 schematic
• purposes of MAX-232 charge pumps
• maximum bit rate calculation

Pre-Lab 6 (1)

• C program

Pre-Lab 8 (1)

• schematic

Pre-Lab 10 (2)

• purpose of filter
• how to show more details about a protocol layer

Labs

Lab 1 (3)

• cover page
• audacity and 'scope screen captures for your number
• a program listing which would generate the above waveform

Lab 2 (3)

• plots of waveforms
• histograms
• table comparing RMS measured and computed from historgrams

Lab 3 (2)

• spreadsheet table showing calculations
• characteristic impedance

Lab 4 (2)

• screen capture
• code

Lab 5 (3)

• MAX 232 output impedance measurement
• RS-422 waveform capture
• RS-422 slew rate

Lab 6 (3)

• C listing
• graph
• roll-off (matching graph)

Lab 7 (4)

• schematic
• noise plot
• screen capture
• BER vs SNR plot

Lab 8 (2)

• schematic
• waveforms

Lab 9 (5)

• packet contents in hex
• 'scope screen capture
• wireshark output
• preamble frequency
• portions of frame not shown

Lab 10 (5)

• Intro q2: GET to OK delay 50 to 100 ms
• IP q1: your IP address is 142.232.x.y
• IP q2: ICMP
• IP q5: identification field, header checksum changes
• IP q6: destination address must stay fixed, TTL must change

Assignments

Assignment 1

Marked out of 7.  One mark each for:

• Q1: 6.5 bits/word
• Q1: 21.6 bps
• Q2: CallCatinHat
• Q6: program that differentiates between Unicode and ASCII
• Q8: d=0.5cm
• Q8: D=1.2cm
• Q9: Zo=63 ohm

Assignment 2

Marked out of 7.  One mark each for:

• Q1 (b) dlm=0 dll=6
• Q1 (c) LSR bit 3
• Q2 (a) 5.38 MHz
• Q3 (a) at generator side
• Q4 (a) 100mV
• Q5 52~kHz (or 62 kHz)
• Q6 (a) group delay = 0.5 and 1 ms

Assignment 3

• Q1: total change of 4pi over 0 to 4kHz (4 peaks)
• Q2: slew rate ~60 V/us (or MV/s)
• Q3: 0.5V
• Q4: 1dB loss
• Q5: 512 samples/symbol
• Q6: polarity insensitive
• Q9:  CRC = 100

Assignment 4

• Q1a: 63 bits
• Q2: crc=0
• Q3b: cisco-linksys
• Q4: checksum=7bb3
• Q5: 255.224.0.0
• Q6: correct 1, detect 2
• Q7: 166kb/s

Mid-Term Exam

The exam was marked out of 16.  One mark was assigned for each of the following:                                                                                                                      

Q1

• - use of correct equation to calculate entropy
• - correct answer
• - use of correct formula to calculate bit rate
• - correct answer (if the first answer is wrong, no marks for this answer)

Q2

• - correct number of bytes (no other marks if this is wrong)
• - correct extraction of x and y bits
• - correct answer

Q3

• - 24 AWG = 0.5mm
• - solved Zo equation for D
• - correct answer

Q4

• - one mark for each correct answer

Q5

• - correct answer
• - justification

Final Exam

Items marked for each question (1 marks per item unless otherwise indicated):

Q1 (8)

3 for splitting into individual code points (1 each)
2 for extracing correct bits from each multi-byte encoding (1 each)
2 for correct code point values
1 for identifying the ASCII value

Q2 (5)

- bit values (0x35 or 0x53)
- bit order (lsb first)
- Manchester encodings
- voltages (+/- voltage)
- time axis (100 ns/bit)

Q3 (5)

- convert dBm to W
- use Friis equation
- correct wavelength
- solve for distance
- answer

Q4 (3)

- crosses fsym/2 at 0.5
- symmetrical
- linear-phase

Q5 (5)

- start flag
- end flag
- 2 escapes (1 mark each)
- data copied correctly

Q6 (3)

- correct number of CRC bits (3)
- division procedure
- result (100 for 1101 and 110 for 1101)

Q7 (3)

- correct value of t
- compute P(t)
- answer (~1%)