Re: [slim] Bandwidth consumption

2007-08-28 Thread teddy278

Hi egd,

I use devolo dlan 200av as a backbone for some parts of my network.
They ship with a software telling me how fast each adapter is running
at the moment. Maybe there is some software like that for your
homeplugs as well, so that you can see if they connect all right?


Greetings!
teddy


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Re: [slim] Bandwidth consumption

2007-08-28 Thread egd

teddy278;223389 Wrote: 
 They ship with a software telling me how fast each adapter is running at
 the moment. Maybe there is some software like that for your homeplugs as
 well, so that you can see if they connect all right?

Teddy, thanks for reminding me about the software, I'd completely
forgotten about it because the netplugs have just worked from day one. 
The only thing I'd used the software for previously was to set a network
name.


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Re: [slim] Bandwidth consumption

2007-08-27 Thread egd

thanks for the replies - I've just moved home and started getting
intermittent dropouts on a SB3.  At my previous place I was running two
SB3s and a Transporter simultaneously via netplugs with no issues.

I swapped the unit that was losing the connection with another and the
same thing happened, so I'm guessing its a wiring thing rather than a
problem with my Squeezeboxes.  Seems intermittent though, which is
puzzling, and losing the network connection only seems to occur when
streaming to two or more devices at the same time, so perhaps a netplug
is faulty?


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Re: [slim] Bandwidth consumption

2007-08-27 Thread Mark Lanctot

Apparently HomePlugs' performance varies greatly from home to home, and
apparently they don't work as well in North America as in Europe due to
different wiring practices (which explains why they're more expensive
and more difficult to find here).


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Re: [slim] Bandwidth consumption

2007-08-26 Thread agentsmith

My experience with Homeplug, even my Panasonic Homeplug AV, is that it
does not go much over 4-5 Mega Bits per second.  At least in my home
electrical system they don't.

I have both Draft-N 2.0 and Homeplug AV installed at home, and neoither
deliver close to what the adverts promised.  But the Draft N environment
is at least 3-4 times quicker than the Homeplug AV.

Just my experience, YMMV


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Re: [slim] Bandwidth consumption

2007-08-26 Thread Robin Bowes
agentsmith wrote:
 My experience with Homeplug, even my Panasonic Homeplug AV, is that it
 does not go much over 4-5 Mega Bits per second.  At least in my home
 electrical system they don't.

Are you sure you're not confusing mega *bits* with mega *bytes* ?

Homeplug is 85 mega *bits* / second, i.e. 10.625 mega *bytes* / second.

You won't get anywhere near that speed, but 4-5 mega *bytes* / second
would a reasonable speed from an 85 mega *bit* / second network.

R.

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[slim] Bandwidth consumption

2007-08-25 Thread egd

Just wondering whether anyone knows how much bandwidth is consumed when
streaming lossless FLAC audio to an SB3.  Bascially I'm curious as to
the point at which one would saturate an 85mbps netplug's throughput
capability (all else being equal).


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Re: [slim] Bandwidth consumption

2007-08-25 Thread Mark Lanctot

The FLAC itself will be ~1000 kbps, although recent FLAC versions can
make files with as little as 700 kbps.  Add 250-500 kbps overhead, so
you have ~1.5 Mbps per stream maximum.

If you actually have 85 Mbps through HomePlugs, you could run 56
simultaneous FLAC streams...I'm not sure about HomePlugs' actual
bandwidth but I'm betting you won't get anywhere near 85 Mbps - however
it's unlikely you have 56 Squeezeboxes either.  ;-)


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Re: [slim] Bandwidth consumption

2007-08-25 Thread Pat Farrell
egd wrote:
 Just wondering whether anyone knows how much bandwidth is consumed when
 streaming lossless FLAC audio to an SB3.  Bascially I'm curious as to
 the point at which one would saturate an 85mbps netplug's throughput
 capability (all else being equal).

You can get a decent estimate pretty easily.

On http://www.pfarrell.com/prc/bits.html I show how many bits are in a 
RedBook stream, which is the raw, uncompressed PCM stream (wav, etc.)

The short answer is that raw PCM takes
= 1,411,200 bits/second
= 176,400 bytes/second
= 172 Kbytes/second

Most FLAC files are about half that, so they would require about 
90Kbytes/second

To be safe, you should add in 20% or so for TCP/IP overhead, headers, 
checksums, addresses, etc.

Thus one megabit per second, delivered is more than enough.

Pat

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