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DIY & Tutorials
DIY For Audio
Jitter, SPDif and other fun stuff
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<blockquote data-quote="Norval" data-source="post: 39691" data-attributes="member: 62"><p>Ludo, its actually interresting to see how much the pulse shape is off from your tests.</p><p></p><p>This is one of the test equipment we used to test 2Mb signals, and one of the options is to check the pulse shape.</p><p>http://www.vilcomspb.ru/catalog/ald/docs/PulseAnalysisOption.pdf</p><p></p><p>If you look at the document, you'll see the pulse shape template. Now there is a difference, You were testing a BMC line code, and the signal tested with the mentioned tester will be HDB-3 based. But the pulse duration is still 144ns, (50% duty cycle). As can be seen, the rise time should be less than 30ns, and so the fall time. The oversoot 10% and undershoot 11%. I have tested signals over 2Km run on electrical twisted cable that fit very nicely within the templet. Looking at the SPDIF signal you checked, it will not be even close to those tolerances, and thats only over a meter :-\</p></blockquote><p></p>
[QUOTE="Norval, post: 39691, member: 62"] Ludo, its actually interresting to see how much the pulse shape is off from your tests. This is one of the test equipment we used to test 2Mb signals, and one of the options is to check the pulse shape. http://www.vilcomspb.ru/catalog/ald/docs/PulseAnalysisOption.pdf If you look at the document, you'll see the pulse shape template. Now there is a difference, You were testing a BMC line code, and the signal tested with the mentioned tester will be HDB-3 based. But the pulse duration is still 144ns, (50% duty cycle). As can be seen, the rise time should be less than 30ns, and so the fall time. The oversoot 10% and undershoot 11%. I have tested signals over 2Km run on electrical twisted cable that fit very nicely within the templet. Looking at the SPDIF signal you checked, it will not be even close to those tolerances, and thats only over a meter :-\ [/QUOTE]
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DIY & Tutorials
DIY For Audio
Jitter, SPDif and other fun stuff
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