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Chris, Brad, 802-3-10gbt, Why are NEXT and MDNEXT calculations skewed in clause 55-Link Segment-release.pdf? If I take the limits of
cable NEXT and two connectors NEXTs and do a power summation I get 1.5 dB to
4.3 dB difference. With MDNEXT the
difference is 2 dB to 6 dB, worse at higher frequencies. I notice the same thing happening in 568-B.2-1
equations (20) and (21). It does not happen with 568-B.1 equations (5) or
(6). The 568-B.1/ASTM D4566 PSNEXT
of equation (7) and the other expressions with factors of ten produces
incorrect power summations as well. It seems to me that all these expressions for
power sums should be forming as root-sum-square. Regards, Alan
Thomas Product
Technology Development athomas@icc.com ICC -----Original
Message----- Dear
Task Force members, This
will be posted on website in a couple of days, but here's a copy now for you to
review. Thanks to Chris for putting this together. Regards, Brad -----Original
Message----- Brad, Please
find attached contribution D1.0 Clause 55 Link Segment specification for
posting. Regards, Chris
DiMinico editor:
Clause 55.X Link Segment MC
Communications |