Hi,
Yes, the problem is that I don’t have a source for a phase-locked copy of the
125 MHz embedded CLK signal.
I tried feeding in a separately derived 125 MHz clock, but because it’s not
synchronous I still didn’t get anything like a stable waveform.
This scope should be able to recover the CLK, or at least I think it should be
able to, because it has other features that are GbE-specific, such as the mask
overlay:
http://www.kan.org/download/CSA8200Ethernet.png
But I don’t know how to set it up. Or maybe GbE is a module that I need to
license. I don’t know, and my queries to the Tek forum has been completely
ignored.
On Jun 22, 2020, at 12:54 AM, Graevinghoff Andreas (Redacted sender
"Andreas.Graevinghoff" for DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Hi Steven,
You are using a sampling scope that is designed to capture repetitive signals
as it constructs the waveform by repetitive sampling at a low frequency (200
kHz in your case).
If you provide a stable trigger to the CSA8200, you will see the waveform you
look for, otherwise it will be the cloud of dots.
Andreas
Mit freundlichen Grüßen / Best regards
Andreas Graevinghoff
Engineering (ETAS/NE)
Tel. +49 711 3423-2600 | Fax +49 711 89661-0 | Andreas.Graevinghoff@xxxxxxxx
-----Original Message-----
From: FreeLists Mailing List Manager <ecartis@xxxxxxxxxxxxx>
Sent: Saturday, 20 June, 2020 07:27
To: si-list digest users <ecartis@xxxxxxxxxxxxx>
Subject: si-list Digest V1 #11
si-list Digest Fri, 19 Jun 2020 Volume: 01 Issue: 011
In This Issue:
#1: From: Steven Kan <steven@xxxxxxx>
Subject: [SI-LIST] Can I inspect 1000BaseT signals on a
CSA8200/80E04
----------------------------------------------------------------------
Msg: #1 in digest
From: Steven Kan <steven@xxxxxxx>
Subject: [SI-LIST] Can I inspect 1000BaseT signals on a CSA8200/80E04?
Date: Fri, 19 Jun 2020 17:20:32 -0700
Apologies in advance if this is OT for this list:
I am trying to look at raw Ethernet waveforms on my oscilloscope, but I have
no idea how to set it up:
I have a pair of RJ45-to-SMA adapter boxes (PRL-RJ45-SMA) that allow me to
carry a set of Ethernet signals over eight 50 Ohm coax cables, and then I’ve
interrupted those 50 Ohm coax cables with a set of differential pickoff boxes
(PRL-860Q-SMA) that allow me to probe any pair with 10x attenuation on the
scope.
So the connection between the NIC and the switch looks like:
Cat5ePRL-RJ45-SMA8x0.5mCoax2xPRL-860Q-SMA8x0.5mCoax PRL-RJ45-SMACat5e
http://ftp.kan.org/download/PRL-RJ45-SMA_PRL-860Q-SMA.JPG
The chain of adapters and pickoffs seems to be ok, because I can successfully
carry Gigabit traffic over the link. I’ve tested two different NICs into two
different switches, and all combinations successfully negotiate a Gigabit
link, and iperf reports throughput of ~940 Mbit/sec for any/all cases, which
is the same as I get if I remove my gaggle of adapters and just connect the
NICs directly to the switch.
I have one differential pair from the pickoff going into my scope (CSA8200
with 80E04 sampling head), but I have no idea how to set up triggering, so
all I have is a cloud of dots :-)
If I go into the Trigger menu and choose Pattern Sync, it says “Pattern Sync
Module not available,” but when I go to the Mask menu, I can apply a Mask for
Gigabit Ethernet.
Do I need to buy some sort of license module in order to trigger on Ethernet?
Or am I just doing it wrong?
I want to see PAM-5!!! And eventually I want to do this with 10GBaseT signals.
Thanks!
------------------------------
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