1. ECE164.02 Group 2 – Presentation 8
Gigabit Ethernet TxRx
Andrew Tupper
April 15, 2004

2. Gigabit Ethernet Summary 4/8-4/15 Upcoming Tasks
Current & Completed Tasks
Nearly Completed Aggressive Tx & Rx Boards
Performed Tx & Rx Troubleshooting
Optically Tested Tx & Rx
Performed Optical BER test on Tx
Tested Loop-Back Capability
Measured Optical Power at VCSEL
Updated Gantt Chart
Upcoming Tasks
Complete Aggressive Rx (need SMA connectors)
Continue Testing (cross talk, Rx BER, performance under attenuation, etc…)
Prepare Final Presentation and Report
Group 2 – Presentation 8
April 15, 2004

3. Gigabit Ethernet Aggressive TxRx
Due to problems with conservative design, assembled Aggressive TxRx.
Completed Assembly, except for missing SMAs
No radical heating to indicate short circuits
Group 2 – Presentation 8
April 15, 2004

4. Gigabit Ethernet Tx Optical Test Aggressive Tx design works optically
Group 2 – Presentation 8
April 15, 2004

5. Gigabit Ethernet Tx Optical Test Scope set to trigger from waveform
1 sec persistence
No attenuation
Scope set to trigger from recovery clock
1 sec persistence
No attenuation
Group 2 – Presentation 8
April 15, 2004

6. Gigabit Ethernet Tx BER Test
Connected data from optical Rx in pattern generator
0dB attenuation
BER tester set to average for infinite amount of time
Group 2 – Presentation 8
April 15, 2004

7. Gigabit Ethernet Tx BER Test 0dB attenuation
Several minute test yielded BER of 0.0E-11
0dB attenuation
One hour+ test yielded BER of 0.3E-12
Group 2 – Presentation 8
April 15, 2004

8. Gigabit Ethernet Rx Optical Test
Tested aggressive Rx with optical output from pattern generator
No SMA connectors on Rx, so used probe instead
Group 2 – Presentation 8
April 15, 2004

9. Gigabit Ethernet Rx Optical Test 0 dB attenuation 1 second persistence
Aggressive Rx works!!
Group 2 – Presentation 8
April 15, 2004

10. Gigabit Ethernet Loop-Back Test
Looped Tx output into PD on aggressive Rx
0dB attenuation
Stylish Goggles!
Group 2 – Presentation 8
April 15, 2004

11. Gigabit Ethernet Loop-Back Test
Stage could not be used because Tx output interfered
Even while holding, eye was detected!
Group 2 – Presentation 8
April 15, 2004

12. Gigabit Ethernet
Gantt Chart