Telstra had a nation-wide network outage last week that affected emergency services.
The outage has been pinned on an obsolete Symmetricom SyncServer S300 node, which manages time on the network but resets its 10-bit week counter to zero every 1024 weeks (just under 20 years) in a common and well understood GPS rollover bug that caused the device to reset to 2006.
The SyncServer S300 was discontinued in 2016...