[ntp:questions] Confused about pool rotation
mikes at flatsurface.com
Thu Feb 7 12:35:55 UTC 2013
On 2/7/2013 2:17 AM, Terje Mathisen wrote:
> Most (GSM/3G/4G) cell towers make do with OCXOs/TCXOs, but very good
> ones, rated at a few ppb/day in drift rate.
> The interesting part here is that the actual requirement is for
> _frequency_ synchronization, not absolute time sync!
You're probably not familiar with CDMA systems, which absolutely MUST be
synchronized in both time and frequency.
Hence the appearance of surplus GPSDOs, like the HP Z3801A, which was
part of a Nortel CDMA BTS.
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