AT&T

1990 – AT&T suffers the oddest outage 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.

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