Gigabit Ethernet TxRx
ECE164.02 Group 2 – Presentation 8
Andrew Tupper April 15, 2004
Group 2 – Presentation 8
April 15, 2004
Gigabit Ethernet Summary 4/8-4/15
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
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
Aggressive TxRxGigabit Ethernet
Group 2 – Presentation 8
April 15, 2004
Tx Optical Test
Aggressive Tx design works optically
Gigabit Ethernet
Group 2 – Presentation 8
April 15, 2004
Tx Optical Test
Scope set to trigger from waveform 1 sec persistence No attenuation
Gigabit Ethernet
Scope set to trigger from recovery clock
1 sec persistence No attenuation
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
Tx BER Test Gigabit Ethernet
0dB attenuation Several minute test yielded
BER of 0.0E-11
Group 2 – Presentation 8
April 15, 2004
Tx BER Test Gigabit Ethernet
0dB attenuation One hour+ test yielded BER of
0.3E-12
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
Rx Optical Test Gigabit Ethernet
0 dB attenuation 1 second persistence Aggressive Rx works!!
Group 2 – Presentation 8
April 15, 2004
Rx Optical TestGigabit Ethernet
Looped Tx output into PD on aggressive Rx
0dB attenuation Stylish Goggles!
Group 2 – Presentation 8
April 15, 2004
Loop-Back Test Gigabit Ethernet
Stage could not be used because Tx output interfered
Even while holding, eye was detected!
Group 2 – Presentation 8
April 15, 2004
Loop-Back TestGigabit Ethernet
Gantt ChartGigabit Ethernet
Jan F e b M arch Ap ril
Pro je ct Ste p s: 1 -10 11 -2 0 21 -3 1 1 -10 11 -2 0 21 -2 9 1 -10 11 -2 0 21 -3 1 1 -10 11 -2 0 21 -3 0
ba ckg roun d resea rch (Jan 8 - Ap r 13 )
test eva l boa rd (F eb 5 - F eb 11 )
O p tica l lin k b udge t (F eb 10 - F e b 19 )
C hoo se pa rts (F eb 1 1 - F e b 19 )
O rde r VC SEL /PD 's (F e b 19 -F eb 2 5 )
Bu ild test boa rd (F eb 1 3 - F e b 20 )
D esign Sche ma tic (F eb 1 5 - F eb 22 )
Boa rd desig n (F eb 19 - Ma rch 2 )
D esign rev iew (F eb 26 - Ma rch 4 )
O rde r PC B's (Ma rch 5 - Ma rch 14 )
Sp r ing Bre ak (Ma rch 5 - Ma rch 1 4 )
C onstruct Boa rd (Ma rch 14 - Ma rch 21 )
Tes t ing/Troubles hoot ing (M arc h 21 - M arc h 28)
D esign Mo d ifica tions (Ap r il 1 - Ap r il 7 )
Bu ild second boa rd (Ap r il 7 - Ap r il 1 3 )
F in a l re po rt (Ap r il1 3 - Ap r il 21 )
T est (F eb 5 )
Mid te rm R ep o rt (Ma rch 19 )
F in a l R e po rt (Ap r il 2 1 )
Group 2 Gantt Chart - 1 Gbps Optical Ethernet
Pro jected T imeC omp le tedO ve rd ue
Even t