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

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

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

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

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

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

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

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

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

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

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

Gigabit Ethernet Gantt Chart