[time-nuts] GLONASS receiver

Magnus Danielson magnus at rubidium.dyndns.org
Sun Aug 5 21:19:34 EDT 2012


On 08/06/2012 02:42 AM, Hal Murray wrote:
>
> magnus at 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




More information about the time-nuts mailing list