Audiophile grade Router with WiFi

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@Confused - thanks for that.  As I understand it, the (mooted) effect of the phase noise is to inject analog noise into the DAC due to changes in current used by the devices that recover clock information from the network signals.  This is not the audio sample clock but the clock for the bits carried on the network.  So although the clock phase noise could be described as jitter in the (Ethernet) clock, it is not related to jitter in the audio sample clock, since the two clocks are completely unrelated -- at least for Ethernet and asynchronous USB.  It seems quite reasonable to me that clock phase noise on the network/USB clock could cause noise in the DAC as John Swenson proposes (if I understand correctly) although it's obviously debatable whether that causes audible effects -- hard to generalise because it would depend very much on the specific hardware design.  But in any case that's not what audio people usually mean when they talk about jitter.