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