Here is what I did:
I stripped the insulaton of the TX+ and TX- wires in the CAT5 cable
near one end of the cable (the one near the CPU). The other end went
into a 10Mbps Hub.
I used a 200MHz isolated channel oscilloscope to take the measurement
of the differential signal on the TX+ and TX- wires. The Probes were
set to 10X attenuation to keep the bandwidth up till 200 MHz
I tried the same measurement using different setups.
The resultant waveforms are available at:
http://u.unltd.googlepages.com/home
I have also referred to:
ANSI-IEEE Std 1802.3d-1993 (Conformance Test Methodology for IEEE
Standards for Local and Metropolitan Area Networks)
- Type 10BASE-T Medium Attachment Unit (MAU) Conformance Test
Methodology (Section 6)
According to the waveform given at the start (page 10) of this
document, it seems that what I captured is quite what is required but
still I would like the comments and opinions of others.
I wasnt able to find much regarding waveforms of the ethernet signals
thru gools so I would be happy if you would go through my findings and
post in your comments.
Thanking you
Regards and best wishes for the new year
Anurag Chugh
Larsen and Toubro EmSyS, Mumbai India
Thanks for the wishes.
I'd do the measurement in the way of setup 2 or 3.
The shown waveforms make sense.
Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
Anurag Chugh