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Gigabit Ethernet
EE 164 Group 2 – Presentation 7
Ungtae Lee April 8th 2004
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Gigabit Ethernet Project Status 3/22-4/7
Completed/ In Progress Built the Tx/Rx Troubleshoot the Tx/Rx Built the aggressive design
Tx Optically test aggressive Tx
Upcoming Tasks Build and test aggressive
design Rx Evaluate crosstalk
between Tx/Rx Possible second design? Alignment tolerance
testing for unconn. VCSEL
Group 2 – Presentation 7 April 8th 2004
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Gigabit Ethernet Normal Design Rx/Tx
Group 2 – Presentation 7 April 8th 2004
Heated up due to short
Heated up due to short
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Gigabit Ethernet Normal Design Rx/Tx
Group 2 – Presentation 7 April 8th 2004
To fix problem, used Etcher to separate the ground plane with the power supply.
-Unfortunately, it did not solve the problem of shortage. Receiver still heated up.
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Gigabit Ethernet Normal Design Rx
Group 2 – Presentation 7 April 8th 2004
-Electrical and optical testing showed the Transmitter to be nonfunctional.-Compared test board with our Rx.-Found pins 15 and 7 were not grounded in the test board-Etched out and removed pins from the Maxim 3264 chip
-Made no difference in test results-Decided to move on to aggressive design
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
-Initial Electrical test proved to be successful. -Used the probe to detect an eye in the differential output of the Tx
Electrically Probed one of the differential outputOutput from probe shows eye (using
PRBS7 input, connected dots)
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
-Did not have the correct adapter-Manually held up the output of the VSCEL to the input of the Optical Spectrum Analyzer
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
849 nm optical signal was detected
-Surprisingly, the Optical Spectrum Analyzer detected an optical signal at approximately 849nm-Verification that the VSCEL was working
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
-Initial optical testing of the transmitter shows a rough eye-only one PRBS 7 input
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
-Overview of the Tx optical testing-Noted that using both differential inputs produced better results-example of how optical attenuators were added together using connectors
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
PRBS7 input with 2 sec persistence
0 dB attenuation 2 dB attenuation
3 dB attenuation 4 dB attenuation
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Gigabit Ethernet Aggressive Design Tx
Group 2 – Presentation 7 April 8th 2004
PRBS7 input with 2 sec persistence
5 dB attenuation 6 dB attenuation
7 dB attenuation
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Any questions?