[Puma Cat]

Originally Posted by IM3CPO

The phase clock you are referencing only applies to Synchronous Ethernet. Synchronous Ethernet is not used on computer networks; its only used on cellular networks, VoIP phones, IPTV. Ethernet computer networks do not carry any clock synchronization information whatsoever.

If you have a DAC that requires an external clock generator via the ethernet cable, then you are injecting it yourself. No home router, etc., will support doing this..

I forwarded your comment verbatim on to Uptone today and received this reply (color emphasis mine):

"It is all about jitter/phase-noise traveling on ground planes and causing variation in clock edges, both overall and inside the chips. That’s why our differential isolation and reclocking works. Of course John [Swenson] will explain this properly in 10+ pages…"

When John publishes his paper (which I understand will include data), as mentioned previously, I will reference it, but here is some additional information with respect to "methods and materials":
"John recently acquired one of the most sensitive timing analysis systems ever built, the Wavecrest DTS-2079. He just received the boards he designed and the parts to populate them to create the required input module so he can use the system for measurement of jitter and noise on the I2S lines inside DACs. And he will be able to produce comparative graphs with variables like EtherREGEN and other things upstream.

While these will not be measures at the analog output of the DAC that the skeptics demand, I feel stongly that showing differences on the I2S lines inside a DAC will be every bit as valid in proving the existence of these effects and the efficacy of the technology we are employing."