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January 15, 1990: The AT&T Reboot
<img width="900" height="520" data-tf-not-load src="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg" class="attachment-full size-full wp-post-image" alt="AT&T" decoding="async" srcset="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg 900w, https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1-300x173.jpg 300w" sizes="(max-width: 900px) 100vw, 900px" />
<img decoding="async" width="300" height="173" data-tf-not-load src="http://vid.geekazine.com/dith/uploads/2014/12/ATT-Logo1-300x173.jpg" alt="AT&T" class="wp-image-24113" srcset="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1-300x173.jpg 300w, https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg 900w" sizes="(max-width: 300px) 100vw, 300px" />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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By Jeffrey Powers
4.6
55 ratings
<img width="900" height="520" data-tf-not-load src="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg" class="attachment-full size-full wp-post-image" alt="AT&T" decoding="async" srcset="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg 900w, https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1-300x173.jpg 300w" sizes="(max-width: 900px) 100vw, 900px" />
<img decoding="async" width="300" height="173" data-tf-not-load src="http://vid.geekazine.com/dith/uploads/2014/12/ATT-Logo1-300x173.jpg" alt="AT&T" class="wp-image-24113" srcset="https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1-300x173.jpg 300w, https://dayintechhistory.com/wp-content/uploads/2014/12/ATT-Logo1.jpg 900w" sizes="(max-width: 300px) 100vw, 300px" />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.
Subscribe to the Day in Tech History
Subscribe to Day In Tech History:
RSS Feed - iTunes - Android - Spotify - iHeartRadio
Facebook -
- RSS Bandwidth by Cachefly Get a 14 Day Trial
- Join me on Patreon and support Day in Tech History
- Intel acquires Xircom
- Wikipedia is launched
- Coveritlive and Twitter goes down for Steve Jobs Keynote
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