1. Enhancing and Implementing an Improved Gigabit Ethernet Card
Group 3:
Ashley Lee
Shaun Rosemond
10/30/2001

2. Design Issues Use existing design as foundation and modify
Opto-module that functions correctly in differential mode
Proper functionality of module after interfacing it with Intel Network Card
Maintain a low, inexpensive cost

3. Old versus New Design Modifications
BNC versus SMA
Durability
Smaller
Higher Bandwidth
Testing Purposes
Single-Ended versus Differential
Noise Reduction
Low Error Rates
Cable

4. How Does Differential Mode Work?
Each signal generated attenuated by some noise value has an inverted
signal generated attenuated by the same noise value; subtraction
results in a more “square-like” signal at twice the original amplitude
with the impact due to noise effectively minimized.

5. Parts for building/testing Gigabit Network Card
Gigabit Ethernet Card (2 with one being fiber)
Agilent HFBR-53D5 Optomodule
Gigabit Interface Card
SMA Connectors
Resistors (68 Ω, 191 Ω, 267 Ω)
Capacitors (.01 μF)
Coaxial Cable (50 Ω Impedance and frequency of 3.0 GHz)
Optical Cable (SC/SC Connectors at various lengths)
Power Supplies (5V DC)

6. Schematic of Agilent HFBR-53D5 Optomodule

7. Design Implementation of GBIC Module
50 Ohm Terminated
Transmission Lines
Coupling Capacitors
Function of Resistors

8. GBIC Module Board Layout
Receive
Part
Color
.01 μF
Yellow
267 Ω
Blue
191 Ω
Red
68 Ω
Green
Optomodule Pins: 9 8 7 6 5 4 3 2 1
Vcc1
Vcc2
Transmit

9. Finished GBIC Module

10. Interfacing with Intel Pro/1000F Board
Blue
Signal Detect
Yellow
Resistors
Red
Capacitors

11. Potential Implementation Issues
Soldering Problems
Interfacing with Intel Board
Exposed Coaxial Cable – Transmission Line?
Signal Detect
Removal of Resistors and Capacitors
Inoperative Components

12. Any Questions?