[time-nuts] Loran in the US

Magnus Danielson magnus at rubidium.dyndns.org
Thu Mar 8 22:27:07 UTC 2012


On 03/08/2012 11:21 PM, Bob Camp wrote:
> Hi
>
> Should be *very* interesting to watch if they try to legislate something
> like that...

Indeed.

There are different telecom needs. CDMA isn't everything.

SDH/SONET goes under G.811, meaning within 1E-11 in frequency.
GSM should be within +/- 50 ppb, but long-term should be like SDH/SONET.
etc. etc.

Cheers,
Magnus

> Bob
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Poul-Henning Kamp
> Sent: Thursday, March 08, 2012 5:10 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Loran in the US
>
> In message<D20D95B53D5C40F5ACA05DF98FDB9F08 at vectron.com>, "Bob Camp"
> writes:
>
>> If they are backing up GPS for telcom, then CDMA timing is the most likely
>> target. That gets them to 10 us max and<  1 us typical. Of course somebody
>> would have to buy the gear to actually *use* it to do any good... (yes I
>> could and have gone on and on about that topic).
>
> Well, they do actually regulate telecoms, so they may simply be told that
> it will be a condition for their licenses.
>
> That happened with respect to power backups for cellular towers
> after Katrina showed the inadequacy of 3 hours lead-acid backup.
>





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