From: "Peter Jensen" <pjensen@agleader.com>
Subject: Re: Processor Synchronization
Date: 1999/01/21
Date: 1999-01-21T23:25:35+00:00 [thread overview]
Message-ID: <788d1f$odp$1@cave1.courtave.net> (raw)
In-Reply-To: 36A509DB.95F62C0B@pwfl.com
I worked on a couple of double and triple redundant control systems. The
first design used a processor synchronization scheme similar to the one you
described. The "heart beat" was obtained from a 10 mb/s communications
port. (Our goal was to sync within a few msec). Critical data was
exchanged and compared via this port to determine any failures. We had a
lot of trouble keeping the synchronization working from release to release
do to changes in the timing of the application software.
The second design abandoned synchronization all together and instead allowed
for a reasonable time delay when comparing critical data. This was simpler,
but obviously can't be used for every type of redundant system.
There are a lot of other issues beyond the scope of this discussion that
must also be considered.
-Pete
next prev parent reply other threads:[~1999-01-21 0:00 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-19 0:00 Processor Synchronization Marin David Condic
1999-01-19 0:00 ` Ken Keys
1999-01-20 0:00 ` Marin David Condic
1999-01-20 0:00 ` Ken Keys
1999-01-21 0:00 ` Marin David Condic
1999-01-21 0:00 ` Sune Falck
1999-01-21 0:00 ` Marin David Condic
[not found] ` <36a83fe3.3666942@news.geccs.gecm.com>
1999-01-22 0:00 ` Marin David Condic
1999-01-20 0:00 ` dennison
1999-01-21 0:00 ` Peter Jensen [this message]
1999-01-21 0:00 ` The Bohemian Monk
1999-01-21 0:00 ` Marin David Condic
1999-01-22 0:00 ` Tom Ziomek
1999-01-22 0:00 ` Al Mok
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