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~Archived - 10 Mbps LAN Waveform

This info supporting the question I had posted here at comp.arch.embedded

This page was originally at http://u.unltd.googlepages.com/home but I had to move it here.

These are the LAN waveforms I captured using  TPS2024 Isolated Channel Oscilloscope from Tektronix

The Instruments used:

Ethernet Signal: 10 Mbps
Oscilloscope used: TPS2024 http://www.tek.com/site/ps/0,,3M-17750-INTRO_EN,00.html
Probes used: P2220 http://stuff.mit.edu/afs/sipb/contrib/doc/tek/TDS2014/071146400.pdf (probe setails below:)
1X / 10 PASSIVE VOLTAGE PROBES
Offerings provide the capabilities of both the 1X and 10X in a compact probe. (However, this type of probe suffers from higher loading factors to the "DUT".)

Model BW -3dB
(MHz)
Input R
Ohms
Input C
pF
Max V
(RMS)
Compatible
Scopes
Cable
Length
(Meters)
Tip / Head
Style
P2220 1X: 6 MHz
10X: 200 MHz
1 M
10 M
110
17.5
150 CATII
300 CATII
TDS1000
TDS2000
TDS200
TPS2000
1.5 N/A

Trial 1:

Setup 1:

Waveforms captured using setup 1 :


Trial 2:

Setup 2:

Waveforms captured using setup 2 :


Trial 3:

Setup 3:





This is what the waveform should ideally look like according to Official IEEE ANSI-IEEE Std 1802.3d-1993 test procedure:




Click on the image below to know how I forced my network card to operate in 10 Mbps mode only:

 
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