Propeller Head Plaza

Technical and scientific discussion of amps, cables and other topics.

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Original Message

Exactly my point!

Posted by Penguin on December 10, 2002 at 17:17:28:
it is way to easy to supress jitter! So why does it matter at the end of the cable? I used to work for a company that manufactured T3 and SONET transmission equipment before 1990. Our biggest problems were to maintain good BER and keep an open eye pattern at the end of a 50km Optical link. The design included a frame buffer (125 usec long at 45 Mbits or 150 Mbits/ sec) we used a PLL controlled with a temerature compensated chrystal. At the end of the frame buffer the jitter of the data was whatever the jitter of the teperature compensated clock was (needed to rent a thing from a company to measure it because we could not afford to buy the instrument). Everybody says that BER is not a problem with SP/DIF cables (which i suspected from the beginning :-), so what gives how do you explain the sonic differences between digital cables? Is it the effect of the different grounding schemes? RF leaking into the analog section? stray light from distant galaxies? I am not trying to be a PITA (Pain in the a..), but somebody please come up with a plausible theory, at least as plausible as the theories for analog cables.

dee
;-D