1. ECE135 Group 2 – Presentation 3
Gigabit Ethernet PMD
ECE135 Group 2 – Presentation 3
Bryan Justice February 10, 2005

2. Gigabit Ethernet: Progress Summary
Completed Tasks
Next Week’s Tasks
Updated Gantt chart
Reviewed group responsibilities
Reviewed IEEE 802.3z Standard regarding the PMD module
Selected our VCSELs
Researched and selected our ROSAs
Preliminary optical link budget
Placing orders by Feb. 11
Complete optical link budget
Build practice board
Revise Gantt chart
Start working on schematic
Thinking about board layout and software

3. Group Responsibilities
Andrew Meyerson – Administration, ordering, soldering
Clifton Kerr – Layout, design, testing
Vinh Nguyen – Webpage, report writing
Bryan Justice – Optical link budget, design, testing, report writing

4. Gantt Chart

5. IEEE 802.3z PMD Research
We will be building a Physical Medium Dependent (PMD) sublayer board
PMD should conform to the IEEE 802.3z specifications for type 1000BASE-SX (Short Wavelength Laser)

6. 802.3z Standard
PMD block diagram as found in the 802.3z standard

7. 802.3z Cont.
Transmit characteristics (from 802.3z standard)

8. 802.3z Cont.
Receive characteristics (from 802.3z Standard)

9. 802.3z Cont.
The standard also defines a worst case link power budget and penalties
This will probably be needed for determining the optical link budget

10. VCSEL Research Chose VCSEL Advanced Optical Components
HFE VCSEL
2.5Gbps, 850nm, SC VCSEL
Cost: $14.50 for less than 1000
$7.25 for 1000 or more
This VCSEL provided what we felt was the best combination of performance, price, and availability
Placing orders by February 11

11. Four Corners Analysis for AOC HFE4391-541 VCSEL

12. Other VCSELS
We chose to look primarily at 2.5Gbps models because they require less current. Many 1.25Gbps models require more current to operate properly than the Maxim laser driver will be able to provide in the worst case.
Other VCSELs examined:
Emcore
Roithner Lasertechnik
Appointech
ThorLabs

13. ROSAs ROSA has been selected HFD3381-108 ROSA 2.5Gbps, 850nm, SC-ROSA
Cost: $10.00 for less than 1000
$5.00 for 1000 or more
This part, like the AOC VCSEL, provided the best combination of performance, price, and availability

14. Four Corners analysis of AOC HFD3381-108 ROSA

15. Other ROSAs, drawbacks
Avalon Photonics: LC connectorized only, Swiss, $20.00
ULM: $25, overseas company
Luxnet: Taiwan company, no response from inquiries
Hamamatsu: unsure about connectors
Copax: No response
Optowell: Korean company, no response to s
Gigacomm: unsure about connectors, many errors in the data sheet
AOC’s ROSA featured above average performance among this group, was in stock, and had the best price, making the ROSA decision very easy.

16. Preliminary Budgeting (estimation)
AOC VCSEL: $14.50 (2)
AOC ROSA: $10.00 (2)
Two board fabs: $70.00
Maxim driver and limiting amp, Digikey passives, and Murata inductors, plus allowances for shipping costs: $80.00
Total projected budget:
Approximately $210.00

17. Test Board Problems
First test board kit was misplaced, putting us behind schedule.
Second kit has been obtained
Key to soldering lab did not work, compounding our frustrations
Construction of test board (and testing) should be completed no later than Feb. 13

18. Next Week Build and test the test board Finalize optical link budget
Begin design schematic
Become familiar with board layout and necessary software
Revise Gantt chart as necessary
Order parts

19. References
IEEE Computer Society (2003). IEEE Standard. New York: The Institute of Electrical and Electronics Engineers, Inc. Retrieved Thursday, January 20, 2005, from ECE website:
ECE164 Group 1 Presentations. (April 26, 2004). ECE164 Group 1 Website. Retrieved January 20, 2005 from
ECE164 Group 2 Presentations. (April 17, 2004). ECE164 Group 2 Website. Retrieved January 20, 2005 from
AOC datasheets for the HFE VCSEL and HFD ROSA