ECE164.02 Group 2 – Presentation 8
Gigabit Ethernet TxRx
Andrew Tupper April 15, 2004
Gigabit Ethernet Summary 4/8-4/15
Current & Completed Tasks Upcoming Tasks
Nearly Completed Aggressive
Tx & Rx Boards Complete Aggressive Rx
Performed Tx & Rx (need SMA connectors)
Troubleshooting Continue Testing (cross
Optically Tested Tx & Rx
talk, Rx BER,
Performed Optical BER test on
Tx performance under
Tested Loop-Back Capability attenuation, etc…)
Measured Optical Power at Prepare Final
VCSEL Presentation and Report
Updated Gantt Chart
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 Scope set to trigger from
waveform recovery clock
1 sec persistence 1 sec persistence
No attenuation 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 0dB attenuation
Several minute test yielded One hour+ test yielded BER of
BER of 0.0E-11 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
Group 2 Gantt Chart - 1 Gbps Optical Ethernet
Jan Feb M arch April
Project Steps: 1-10 11-20 21-31 1-10 11-20 21-29 1-10 11-20 21-31 1-10 11-20 21-30
background research (Jan 8 - Apr 13)
test eval board (Feb 5 - Feb 11)
Optical link budget (Feb 10 - Feb 19)
Choose parts (Feb 11 - Feb 19)
Order VCSEL/PD's (Feb 19 -Feb 25)
Build test board (Feb 13 - Feb 20)
Design Schematic (Feb 15 - Feb 22)
Board design (Feb 19 - March 2)
Design review (Feb 26 - March 4)
Order PCB's (March 5- March 14)
Spring Break (March 5 - March 14)
Construct Board (March 14 - March 21)
Testing/Troubleshooting (March 21 - March 28)
Design Modifications (April 1 - April 7)
Build second board (April 7 - April 13)
Final report (April13 - April 21)
Test (Feb 5)
Midterm Report (March 19)
Final Report (April 21)
Projected Time
Event Completed
Overdue