[time-nuts] ``direct'' RS-232 vs. RS-232 via USB vs. PPS decoding cards

[Hal Murray]

shouldbeq931 at gmail.com said:
> I run PTP on a Raspberry Pi using its onboard USB connected NIC, and onboard
> NICs on HP and Dell servers, I see +- 5 microsoconds jitter in the one way
> delay across 4 fanless HP switches, ...

Could you please say more?

USB 2 has a 125 microsecond polling interval.  Is that averaging over a 
batch?  If so, how many? ...

Have you seen any hanging bridges?




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