Re: "What time is it?" aksed the microcontroller
robin.pain_at_tesco.net
Date: 05/24/04
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Date: 24 May 2004 01:01:23 -0700
<jiang> wrote in message news:<40ae398e$0$31679$afc38c87@news.optusnet.com.au>...
> Assume that we have a group of computers. Some of them are PCs and others
> are small microcontroller boards of different types. Some of the PCs running
> Linux and others running Windows, vxWorks or QNX. Microcontroller boards
> have no operating system but some embedded program that we are going to
> provide.
>
> Our mission is "some how" synchronize their time as accurate as possible.
> What we are going to debate is the following special cases;
> 1. All computers (PCs and controllers) are placed next to each other and
> we are free to connect them together any way we want (freedom in electronics
> and in sw).
> 2. Computers are in the same room but separated from each other with few
> meters
> 3. Computers are in different rooms of the same building.
> 4. Computers are in the same campus.
> 5. Computers would be anyware (in the same town or city, country,
> continent, on the world or near Earth orbits).
>
> What would be your suggestions ? How to connect them together? Which sort of
> HW and SW would you use ? How accurate the time sync. you would acheive
> (minute, secont, milli sec, micro sec, nano sec )?
Ah yes, now I remember why I fled university.
Robin
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