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

Re: Non-Bell ESS?

Justa Lurker (
Wed, 13 Jul 2005 22:01:08 GMT wrote:

> Diamond Dave wrote:

>> 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.

> No, that's not the one I'm thinking of.

> I'm very sure it was a non Western Electric switch. It was made in
> Plano Tx (forgot the maker's name) and it was used for local calls.

DSC = Digital Switch Corporation

I thought they were in Richardson TX, but I guess it was Plano.

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