[time-nuts] GPS jamming susceptibility

[Bob Camp]

Hi

Most telecom systems are still a "timing monoculture". All of their sources
of time are duplicates of the same thing. There are multiple categories of
trouble that will affect all of their sources. Redundancy with multiple
types of timing is what would make a more robust system. That's the stuff
you rarely if ever see.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Magnus Danielson
Sent: Tuesday, November 23, 2010 8:05 AM
To: time-nuts at febo.com
Subject: Re: [time-nuts] GPS jamming susceptibility

On 23/11/10 13:36, Bob Camp wrote:
> Hi
>
> If you are going to depend on any form of over the air timing, you need
holdover. It's not a "option" its a requirement. There are simply to many
things that can create issues with the signal you are using. That's true of
any over the air system, not just GPS. Redundancy would also be nice, the
people who design these systems don't seem to ever go that route.
>
> The nice part of that is - we get lots of Thunderbolts and Z380x's on the
surplus market nice and cheap. Good stuff.

It varies among the operators. Some have their telecom hat on, and then 
network redundancy is among the top things and they look at it 
carefully. Then again others treat it as an alien aspect and their only 
strategy is to make it as cheap and least annoying as possible. Ah well.

There are many ways to loose sync, real life teaches us...

Cheers,
Magnus

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