RE: Re: Lighting Control (was Re: Adverts)

["Harrison, Mark (Alliance)" <mark.harrison@xxxxxxx>]

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You wrote about Bluetooth:

> Only 8 devices per piconet

I was worried about this, until I read the bit about node sleep states, and
how therefore piconets could have 256 nodes in a rotating manner. I don't
think that the device sleep latency would be an issue for ceiling roses?

-----Original Message-----
From: Colin Bradford [mailto:colin@xxxxxxx]
Sent: 30 August 2000 15:10
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Re: Lighting Control (was Re: Adverts)



On Wed, 30 Aug 2000, Nigel Orr wrote:

> I'd be interested to hear other folks thoughts on the idea- I'm aiming
for

> my 'Holy Grail' of an intelligent ceiling rose!  I'd be even more
> interested in potential purchasers if I made some :-)

This is what I was thinking of - originally, I wanted a cat5 to every
rose, but the electrician said it contravened IEE regs. I'm currently
considering the LD10/LD11 in the rose method.

> >Now, maybe BlueTooth
>
> Interesting booklet, that Toshiba one you gave a pointer to.  I've
just
> skimmed it, but if I read it correctly (the 'technical' chapter), the
data

> rate is only about 120kbps in 'normal operation' and it only manages
> 720kbps when 'hotrodded', ie single direction, no error correction
etc.  I

> can't believe that's true, is it?

> They're also touting it for listening to your hi-fi wirelessly, at
> 64kbps... I hope compression gets better!  First impressions were,
sadly,
> that it looks like more marketing than technology, with what looks
like a
> lot of very contrived advantages, but I really do hope I am wrong.

Bluetooth looks great for connecting your PDA to your mobile phone, or a
headset without cables. Don't think it will take off for in house stuff
though - it's too limited. Only 8 devices per piconet, and limited
range. At the moment, it's too expensive as well - the development kits
are well out of my reach.

I'd wondered using 418 MHz radio links to do this stuff - but I'm
concerned about TETRA taking over the frequencies.

Cheers,

Colin.

--
Colin Bradford, Forrester Research
Charlotte House, 9-14 Windmill Street, London W1P 1HF UK
T: +44 20 7631 0202 F: +44 20 7631 5252