[SI-LIST] Re: 4-port node numbering
- From: "Dunbar, Tony" <tony_dunbar@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 13 Dec 2005 14:18:07 -0600
Ray,
I come across quite a broad range of such Touchstone format files from a
number of vendors. I come across both forms in about equal measure.
What's most infuriating is that very few suppliers take the time to
provide comment text in the file header to inform the user which port is
which.
I know you're asking for comments on 4-port systems, but I've also come
across a dual diff-pair 8-port example from one vendor (which had
excellent comment text) that followed your example b) form; i.e. ports
1-4 down the left side for the socket-end and ports 5-8 down the right
side for the plug-end.
Due to the lack of specification or rigorous convention, let's at least
have some header text, please!!
Regards,
Tony
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Ray Anderson
Sent: Tuesday, December 13, 2005 1:49 PM
To: si-list@xxxxxxxxxxxxx
Cc: Ray Anderson
Subject: [SI-LIST] 4-port node numbering
I have general question regarding 4-port s-parameter files. Does anyone
know if there is a generally accepted industry standard for node
numbering?
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I have seen both of these schemes used in various places:
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a)
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+-----+
1---| |-----2
| | =20
3---| |-----4
+-----+
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b)
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+-----+
1---| |-----3
| | =20
2---| |-----4
+-----+
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It has been my observation that scheme a) is the most common and
intuitive (when I think S12 I think transmission and when I think S13 I
think crosstalk) however scheme b) has popped up often enough to be a
possible contender.
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Comments???
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-Ray
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Raymond Anderson
Senior Signal Integrity Staff Engineer
Product Technology Department
Advanced Package R&D
Xilinx Inc.
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