From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,c617ae447ca32f2f X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-04-10 05:52:53 PST Path: archiver1.google.com!news1.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!cpk-news-hub1.bbnplanet.com!cambridge1-snf1.gtei.net!news.gtei.net!bos-service1.ext.raytheon.com!bos-service2.ext.raytheon.com.POSTED!not-for-mail Message-ID: <3CB435A4.8A011DF1@gbr.msd.ray.com> From: Steve O'Neill X-Mailer: Mozilla 4.7 [en] (X11; U; HP-UX B.11.11 9000/785) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: comp.lang.ada Subject: Re: Ariane Failure References: <3CA50E9A.CBF24F1B@lanl.gov> <3CB3031A.26E08904@gbr.msd.ray.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Wed, 10 Apr 2002 08:52:52 -0400 NNTP-Posting-Host: 192.199.125.132 X-Complaints-To: news@ext.ray.com X-Trace: bos-service2.ext.raytheon.com 1018443172 192.199.125.132 (Wed, 10 Apr 2002 08:52:52 EDT) NNTP-Posting-Date: Wed, 10 Apr 2002 08:52:52 EDT Organization: Raytheon Company Xref: archiver1.google.com comp.lang.ada:22312 Date: 2002-04-10T08:52:52-04:00 List-Id: John Roth wrote: > > "Steve O'Neill" wrote in message > > And here was another of the fatal system design flaws that should never > > have been made... it seems that this 'other channel' was an *identical* > > system which, of course, reacted in the same manner. Leaving the poor > > flight control computer with no valid data. Ooops! > > Not exactly. The assumption was that failures would be hardware, > so dual coding the software wasn't an objective. Well, no matter where you assume the failures will or will not occur you should never design a dual-redundant system where both strings are identical. Steve