January 15, 1990: AT&T Reboots

AT&T

AT&T

1990 – AT&T suffers the oddest outtage nationwide. A switch in New York crashed, then rebooted. This caused the other switches linked to the New York switch to also reboot. The cascade continued on until all 114 switches were rebooting on 6 second intervals.

The continued failure lasted for 9 hours, leaving 60,000 customers without long distance calling. The problem was resolved when engineers found a bug in the latest update dealing with 4ESS long distance switches. They applied a patch which stopped the crash-reboot cycle.

Wikazine – Full show notes for January 15

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Jeffrey Powers @geekazine

I love tech history. I enjoy how we evolved from computers that fill a room to computers we wear on our bodies. I have put a full archive of tech history together at Wikazine. You can also talk history at Google +. I am also a podcaster and V-caster at Geekazine and a Podcast Coach at How to Record Podcasts. You can also sign up for a Helpout

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