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on Oct 9, 2013
on Oct 10, 2013 by algoss
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Where can I download the mask file for
IEEE 802.3ba, nPPI module electrical output spec at TP4
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Oct 10, 2013 6:04 AM
I'm not aware that you can. If you understand the measurement, you can create one, though.
I'm not as familiar with the various flavors of Ethernet as I am with other serial buses. I just looked at the 2010 version of the spec, and found the information that might define a mask. There seems to be missing information, though:
- What is the clock recovery scheme?
- What are J2 and J9?
- How do X1 and X2 define a mask?
If you know the answer to these questions, you might be able to build your own mask. If you are using an Infiniium real-time scope, the attached Excel spreadsheet might help. It's a tool that was created some years ago, and which I have been maintaining for a while.
You enter the parameters of your serial link. The spreadsheet provides some guidance to make sure you have enough information. Then you copy and paste the orange are into a text file, and change the extension to .msk. That's all there is to it. If you have questions, post them here. If the spreadsheet has a problem, post here, and I'll take a look at it.
Disclaimer: For more reliable response, you should contact your local Agilent Technical Call Center. The Agilent Forums are monitored on an "as available" basis, and aren't necessarily the fastest way to get technical questions answered.
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Oct 10, 2013 11:17 AM
Thanks for the information.
This is for a 10G optical receiver before CDR and there is no clock involved other than the trigger for the scope.
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Oct 10, 2013 11:53 AM
Mask and Jitter measurements both need a clock, since in either case, and by definition, you're making a measurement relative to that clock.
That could be a separate clock line or, more probably, an inferred clock generated by a PLL. In the target, the PLL would be HW, with fixed parameters. In the scope, the PLL would be SW, with variable parameters (Order, BW). Those parameters would be set to match the parameters of the HW PLL.
Somewhere in the spec, a clock recovery mechanism has to have been defined, so with that information, you should be able to build a mask.
Disclaimer: For more reliable response, you should consider calling your local Agilent Technical Call Center. The Agilent Forums are monitored on an "as available" basis, and aren't necessarily the fastest way to get technical questions answered.
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