The receiver do not need to be in the datacenter, there is this thing called "the internet" that you can hook it up to.
> > >in every PoP to do measurements. In that case, the difficulty isn't in > > >measuring one-way latency, it's in synchronizing the time on all the > > >servers. And with fairly cheap GPS and CDMA clocks that is a lot > > >easier/cheaper than it once was. > > a robust mesh of strat-2 chimers gives one more resilence > and more accuracy than syncing off a single source. > > > But what GPS clock can you install in a datacenter? AFAIK, they all > > require roof (or at least window) access in order to install the > > antenna. (At least, all the GPS based ntp servers I've looked at do). > > Is that not true of CDMA servers? > > some GPS, some PPS, and an atomic source here and there > give great diversity and only a few need roof access. > > > How have others solved this issue? (Short of owning their datacenters.) > > Use NTP, run most systems as strat-2 Time2.Stupi.SE and Time4.Stupi.SE are both stratum-1 accessable through the Internet, tracable to UTC-SP (part of TAI) without use of GPS or slaving to CDMA (that slaves to GPS). -P
