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To: Jim McMannis who wrote (130119)6/1/1999 1:39:00 PM
From: Kenneth Aird  Respond to of 176387
 
We can always send the shuttle up to repair them :)

Seriously, I suspect that satellites are one of the few places
where people gave serious thought to the design life of software.
Also the software is usually uploadable.
Finally the number of satellites is relatively small compared
to the millions of other embedded devices around.

I doubt that modern phones draw much current on the ring,
but the phone company could still be a huge user of power
with all the switches they keep running.
I know one office building I used to work in had a phone number you
could dial to learn its current power use. It was typically
about 7 megawatts, mostly due to desktop computers. There was also
a significant percentage for air conditioning, even in the winter,
to suck out all the heat produced by those computers.

Ken



To: Jim McMannis who wrote (130119)6/1/1999 3:11:00 PM
From: rudedog  Read Replies (1) | Respond to of 176387
 
Jim -
I am not an expert in satellite technology but I know how it works for the GSP system. The satellites have a 1024-deep counter (10 bits) which counts weeks. It is an arbitrary number which has no notion of years, let alone centuries. It is up to any ground systems which use the GSP to do whatever date management is needed. This system clearly has no Y2K problems - at least in the satellites.