On 08/06/2012 02:42 AM, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
Many cell applications require 50 ppb.
What is the context for that?
I'm not a cell-phone wizard. I think they have two problem areas: frequency
and time.
50 ppb makes sense for frequency. It doesn't say anything about time.
GSM and derivates have +/- 50 ppb as frequency requirement, no time
requirement.
Later derivates add time requirements.
See ETSI and 3GPP specs, as freely available online.
Cheers,
Magnus
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