[rescue] AT&T 3B2 revival

Alan Hightower alan at alanlee.org
Tue Aug 18 18:06:55 CDT 2015

On 2015-08-18 18:45, adh at an.bradford.ma.us wrote: 

> remember, the 3b architecture was developed for the controller of the
> 3ess, and telephone switchgear lasts a *looong* time; we designed for
> 20-year 24x7 uptime. the 4ess, also using a 3b20d main controller,
> was made from '76 to '99, and there are still some 100 in service,
> with plans for a next-gen 4ess. the 5ess, still in production, has a
> 3b21d 'administrative module'.
> the 3b20d and 3b21d are, in telcom style, completely double-redundant;
> you can walk up to one and pull any board at random without affecting
> operation. they, and their relevant intellectual property, won't be
> obsolete any time soon.

I thought most of the current 3B2 lineage (4E/5E) was done in emulation
on Sun machines? I'm a bit surprised at the notion of a WE32200 in
silicon running in 2015. 


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