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ECE 4006 Senior Design Project

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Construct a test-bed to perform experiments and determine methods to implement ... Redundant Components on Ethernet Board had to be removed using pliers ... – PowerPoint PPT presentation

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Title: ECE 4006 Senior Design Project


1
ECE 4006Senior Design Project
Bringing Gigabit Ethernet to the Masses
  • Talal Mohamed Jafaar
  • Ibrahima Bela Sow
  • Mohammad Faisal Zaman

Supervisor Dr. Martin Brooke
2
Introduction and Background
3
Ethernet History
  • DIX Ethernet (1970s)
  • Fast Ethernet (1995)
  • Gigabit Ethernet (1998)

4
Gigabit Ethernet Technology
  • Fiber Channel
  • Multi-mode transmission
  • Fiber and copper based networks

5
Gigabit Ethernet Physical Layers
6
Gigabit Specifications
7
Purpose
  • Construct a test-bed to perform experiments and
    determine methods to implement Gigabit Ethernet
    at an affordable cost for the general consumer by
    moving the fiber-optic transceiver of an Ethernet
    card to an experimental board that will be
    located outside of the computer.

8
Experimental Board
  • HFBR 53D5 fiber optic transceiver
  • Differential I/O

9
First Step
  • Testing the fiber-optic transceivers
  • What parts do we have
  • What parts do we need to order

10
Challenges
  • Soldering and unsoldering
  • Proper line termination
  • Grounding
  • Board Quality
  • Getting parts on time

11
So Far
  • Tested modules
  • Unsoldered old modules
  • Found parts to order

12
Complete Circuit Diagram of Intel Gigabit
Ethernet card
13
Circuit assembled on experimental board
Connected using SMA Connectors and RG-316 Co-ax
Cable to the Ethernet Board
14
General Comments
  • Signal scheme uses NRZ (Non return-to-zero
    Signaling)
  • For a 1-Gb data supply we would expect a
    fundamental frequency of 500 MHz.

15
Circuit Components
  • Resistors
  • Basic Function is to match the impedance of the
    50 Ohm Coax lines and for AC-coupling
  • Differential Mode
  • Reduces noise in the signal

16
De-coupling Capacitors
  • High impedance caused by inductance of power
    supply lines and high frequencies
  • protects against current spikes due to fast
    switching

17
Testing and Results
18
Test Setup for the Experimental Board
  • Experiments were conducted under the supervision
    of Dr. Brooke in MiRC

19
Interpretation of the Eye Pattern
20
Eye Pattern Observations
  • PN-7 Encoding with 10ft. Cable (Top)
  • PN-7 Encoding with 100ft. Cable (Bottom)
  • Two different lengths of Optical Cable were
    utilized to test effects of attenuation

21
Bit Error Rate
  • The bit error rate (BER) is the percentage of
    bits that have errors relative to the total
    number of bits received in a transmission

22
Inferences
  • RESULTS OBTAINED
  • Eye Pattern Results
  • BER Results
  • Results show that the experimental board can
    perform data transfer at Gigabit Ethernet speed
    with acceptable performance.

23
Primary Issues with Integration
  • In the process of integrating the experimental
    board and the Gigabit Ethernet Card several
    issues were faced
  • Redundant Components on Ethernet Board had to be
    removed using pliers
  • Signal Detect Pin Connection
  • Ground Pin Connection

24
Redundant Components
  • The box identifies the redundant components on
    the Gigabit Ethernet Board. They need to be
    removed because they already occur in the
    experimental board, and will cause impedance
    mismatch among other problem.

25
Actual Board View
  • Red circles indicate removed components
  • Pin 1 is Ground Pin
  • Pin 4 is Signal Detect

26
Test Setup for the Final System
  • 1) Experimental board attached to the
    Experimental Ethernet card.
  • 2) RG-316 Co-axial Cables, which connect the
    transmitter and receiver s SMA connectors to
    their respective pins on Gigabit Ethernet Card.
  • 3) Experimental Gigabit Ethernet Card
  • 4) 50ft. Roll of Optical Fiber.
  • 5) 5 Volts power supplies powering the receiver
    and the transmitter.
  • 6) Oscilloscope used to verify the presence of
    the Signal Detect signal.
  • 7) The two computer screens used to test the
    transfer of data between the two computers.

27
Initial Test Results and Concerns
  • Intel ProSet Diagnostic Software was used to
    perform basic diagnostic tests.
  • CONCERNS
  • More advanced test were performed. While
    transmission of data packets was successful,
    receiving packets failed.

28
Identification of the Problem
  • Tests were conducted to isolate the location of
    the problem. Attention was focused on the
    distances between the connections and the meshes
    of each signal.
  • Before After
  • Discontinuity must be less than 10 of the signal
    wavelength. In our case minimum acceptable
    discontinuity was 1 cm. (Detailed Explanation
    present in report)

29
Final Test Results
  • Upon resolution the problem, the advanced
    diagnostic tests were repeated, and the data
    packet transfer test was followed by successful
    transmission of useful files between the
    computers.

30
Success
  • Project is successful
  • Thus, future groups can modify the transceiver
    and other components without dealing with the
    Ethernet card
  • Hopefully it will soon be possible to have fiber
    connections in homes all over the globe.
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