Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!umich!caen.engin.umich.edu!stealth
From: stealth@caen.engin.umich.edu (Mike Peltier)
Newsgroups: sci.space.shuttle
Subject: Re: Spinning Shuttle
Message-ID: <48518e97.1766d@june.engin.umich.edu>
Date: 29 Jan 90 06:09:00 GMT
References: <36192@cornell.UUCP> <19500002@hpfipgt.HP.COM>
Organization: University of Michigan Engineering:  Ann Arbor, Michigan
Lines: 19

In article <19500002@hpfipgt.HP.COM> pgt@hpfipgt.HP.COM (Paul Tobin) writes:
>
>							Standard
>procedure is for the shuttle to echo the received data back down for
>comparison with the original data.  This was done, but the HUMAN
>operator failed to note the mismatch!  Somebody was asleep at the
>wheel.

Why was a human relied upon to determine whether or not the data
matches?  That seems sorta silly, when you can just do something
similar to "cat echoed_data | diff - real_data | wc -l" and test
that against zero.  If it's not, simply retransmit.  I don't see any
need for a human in that loop.

-- 
-	-	-	-	-	-	-	-	-
Michael V. Peltier         | Computer Aided Engineering Network      
1420 King George Blvd.     | University of Michigan,  Ann Arbor       
Ann Arbor, MI  48104-6924  |    stealth@caen.engin.umich.edu