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

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

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

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.

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)

Schematic of Agilent HFBR-53D5 Optomodule

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

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

Finished GBIC Module

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

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

Any Questions?