TELECOM Digest OnLine - Sorted: Re: Non-Bell ESS?

Re: Non-Bell ESS?

Diamond Dave (
Mon, 11 Jul 2005 18:51:17 -0400

On 11 Jul 2005 09:38:10 -0700, wrote:

> Wasn't that the one that failed in numerous exchanges all across the
> country as a result of a software bug?

The software problem you're referring to was the infamous crash of the
AT&T long distance network in 1990 when a software upgrade was applied
to the over 100 AT&T/Western Electric #4ESS long-haul tandems in the
US. It brought down most if not all the #4ESS switches to a screeching
halt for the better part of a day.

AT&T had to do an about-face and go back to a previous software
version until they got the bug fixed!

Here's an article written about the incident:

Dave Perrussel
Webmaster - Telephone World

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