Enhancing and Implementing anEnhancing and Implementing anImproved Gigabit Ethernet CardImproved Gigabit Ethernet Card

Group 3:Ashley Lee

Shaun Rosemond

10/30/2001

Design IssuesDesign 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 ModificationsOld 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?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/testingParts for building/testing Gigabit Network CardGigabit 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 OptomoduleSchematic of Agilent HFBR-53D5 Optomodule

Design Implementation of GBIC Module Design Implementation of GBIC Module

•50 Ohm Terminated Transmission Lines•Coupling Capacitors•Function of Resistors

Part Color

.01 μF Yellow267 Ω Blue191 Ω Red68 Ω Green

GBIC Module Board LayoutGBIC Module Board Layout

Optomodule Pins: 9 8 7 6 5 4 3 2 1

Receive

Transmit

Vcc2

Vcc1

Finished GBIC ModuleFinished GBIC Module

Interfacing with Intel Pro/1000F BoardInterfacing with Intel Pro/1000F Board

Blue Signal DetectYellow ResistorsRed Capacitors

Potential Implementation IssuesPotential Implementation Issues

•Soldering Problems•Interfacing with Intel Board

•Exposed Coaxial Cable – Transmission Line?•Signal Detect•Removal of Resistors and Capacitors

•Inoperative Components

Any Questions?Any Questions?