[time-nuts] ISS NTP operation problems.

[Hal Murray]

jim at luxfamily.com said:
> If the pathway is like the ones to/from ISS that I am familiar with,
> they're using the Ku-band or S-band link through TDRSS. In both cases,  the
> signal has to go from White Sands (or Guam) up to TDRSS, which is in  GEO,
> and then back down to ISS.

Is the back down direct or back through TDRSS?

NTP likes symmetric delays.  To first order, it doesn't matter how long it is 
as long as it is symmetric.  This may not be a first order problem.  There is 
a cutoff at 1 second total round trip time.


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