RE: xAP - The Proposed Architecture Explained...

["Mark Harrison" <Mark.Harrison@xxxxxxx>]

Tony,

This is NOT just about Home Automation as defined by HomeVision (or
whatever)

This is about ALL the info you might want to display around your house.

You'll have:

- 1 HomeVision
- 2 eMails (his n hers)
- 1 weather station
- 1 News ticker feed from an internet source
- 1 feed from your burglar alarm

M.

-----Original Message-----
From: BUTLER, Tony, FM [mailto:roaming@xxxxxxx]
Sent: 14 August 2002 12:32
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] xAP - The Proposed Architecture Explained...


> Buy using a central PC you're creating a master-slave system, the
> suggested use of broadcast messages makes the system 
> effectively master
> less for nornal day to day running. Thus other than the physical
> transport, failure of a single device would not stop the whole
system
> continuing to function.

Is this not somewhat negated by having a central HV or homeseer PC or any
of
the other HA controllers out there?
If they go titsup.com then you are probably shafted anyway.  A central
PC
with RAID/a backup PC in place would get around that problem, and we're
only
talking a display system (ATM anyway) not a controlling one, so perhaps
not
the end of the world if it died.
Also, is the failure rate of said systems high enough to warrant
steering
away from a central PC?

I can see what you're trying to achieve with no master server, but this
could make the cost of the intelligent clients prohibitive....
Of course, if as per my other email, you went for the subscription
model,
you'd need smarter clients anyway.....

In an ultimately flexible world of course, you could operate in server
or
serverless mode, with clients as smart or dumb as you like and in
broadcast
or subscription mode, but adding this flexibility would increase
complexity,
add to development time etc etc..... 


Tony


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