[time-nuts] Re: Telstra outage: Possible GPS-related 1024 week rollover.

[Peter Gottlieb]

I have a Aeroflex 7100 which is a dual software defined signal generator 
and analyzer.  It can take in IQ files and generate signals (and do a 
lot more).

Can I use this to generate a simulated GPS signal?  I would want to 
direct couple it to a receiver being tested and probably want a fixed 
attenuator in place to make sure not to damage the receiver if a wrong 
power command is sent by accident.

Peter


On 7/12/2026 8:18 PM, Steven Sommars via time-nuts wrote:
> A major outage in Telstra's mobile network (Australia) occurred at 4:20 am
> AEST on Wednesday, July 8 2026.
>
> https://www.abc.net.au/news/2026-07-10/telstra-warned-about-vulnerability-before-national-outage/106896906
>
>
> https://www.abc.net.au/news/2026-07-11/telstra-gps-timing-network-failure-back-up-systems/106902532
> <https://www.abc.net.au/news/2026-07-11/telstra-gps-timing-network-failure-back-up-systems/106902532>
>
> Early reports indicate a cold start of a data center node set the time back
> to November 2006 (about 1024 weeks) triggering the outage.  The time-nuts
> community is presumably familiar with GPS Week Number Rollovers and the use
> of pivot dates.  In this case the rollover was delayed until the unit
> cold-started.
>
> Do manufacturers ever publish the pivot dates?
> It should be feasible to use an inexpensive SDR-based GPS simulator to
> determine a GPS receiver's pivot date.
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