[time-nuts] WWV and legal issues

Bob kb8tq kb8tq at n1k.org
Thu Aug 30 11:14:26 EDT 2018


Hi

This is not so much a GPS issue as a system design issue. GPSDO’s are used to “smooth over” bumps in a lot 
of systems out there. At the timing levels required by ATM or authentication setups, you can go a *long* time
running on a GPSDO. It’s not a matter of GPS, it’s a matter of doing things on the cheap ….

Bob

> On Aug 30, 2018, at 10:42 AM, Scott McGrath <scmcgrath at gmail.com> wrote:
> 
> Um no
> 
> Will the internet continue to route packets without precision timing yes it will,  Yes the lambdas will stay lit on fiber but the ATM transport that runs on the lambdas will fail (note DSL is simply an ATM VC over copper).  and other timing dependent services will fail
> 
> Will many services like authentication continue especially those based on multimaster replication continue to function?
> 
> No they will not,  they are totally dependent on precision timing to ensure proper replication sourcing. (Microsoft Active Directory)
> 
> Banking transactions in the same boat.
> 
> Unless you’ve actually run a large network you dont realize just how dependent on precision timing the services running over the network have become especially authentication And one reason for this is increased security for the overall network.
> 
> On Aug 30, 2018, at 8:45 AM, Brian Lloyd <brian at lloyd.aero> wrote:
> 
> On Thu, Aug 30, 2018 at 7:01 AM, Scott McGrath <scmcgrath at gmail.com> wrote:
> 
>> 
>> 
>> 
>> Without precision timing there is no telephone network, cell phones or
>> internet.   And that only became true in the last 20 years or so as long
>> haul networks went from FDM on coaxial cable to TDM on fibre.
>> 
> 
> The Internet is largely asynchronous due to the store-and-forward nature of
> the routers. Fiber capacity is increased through the use of wavelength
> division multiplexing (WDM) which is itself a form of FDM. The Internet
> functions without any sort of central synchronization.
> 
> Yes, there are portions that run over the synchronized telco services but
> that is by convenience, not necessity.
> 
> -- 
> 
> 
> 
> Brian Lloyd
> 706 Flightline
> Spring Branch, TX 78070
> brian at lloyd.aero
> +1.210.802-8FLY (1.210.802-8359)
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