[mythtv-users] Back of the envelope calcs for minimum network speed

[David Whyte]

I bought some (fairly expensive) hardware for a wireless frontend and
found it useless.  Then, I have 11b nodes, which when turned on, would
make the video way to slow, plus I was using D-Link, which I have
found to be most unreliable.

Even when the network speed was good, jumping around in video proved
slow and someone else mentioned.  In the end I bought a 25m cable and
will run that until I hardwire the ethernet in.

Cheers,
Whytey

On 9/6/05, Robert Denier <denier at umr.edu> wrote:
> I suspect that if it isn't too hard to do a gigabit switch and adapters
> combined with cat 5e/6 will give you a more responsive system,
> especially when you jump around in the video, but the numbers below make
> it look like the wireless would work...
> 
> On Mon, 2005-09-05 at 22:32 -0700, Fedor Pikus wrote:
> > On 9/5/05, Brian McEntire <brian.mcentire at gmail.com> wrote:
> >         Hi -
> >         A question about network capacity:
> >
> >         I'm planning to put a front end by the TV, and a back end in a
> >         different part of the house. The primary purpose for this
> >         MythTV setup is HDTV viewing.
> >
> >         Some early HDTV recordings are about 2.4 GB for 30 minutes.
> >
> >         This works out to 2.4 * 10^9 * 8 bits/B / 30 min / 60 sec/min=
> >         10.7 Mbps
> >
> > About 1.37 MB/sec. You can get this from 802.11g, but it's right at
> > the limit of the standard 54 MBps (and only if you don't use the
> > network in mixed mode, if you add 802.11b clients the throughput will
> > drop). However, this is well within the limits for the "fast" 11g,
> > i.e. proprietary extensions which typically double the speed of the
> > network (you've probably seen 108 Mbps devices advertised, that's
> > them). The catch is, they are usually 108 Mbps to each other, and 54
> > Mbps to another brand, if you're lucky.
> >
> > I have a network of several Viewsonic WAP/Bridge devices (WAPBR-100,
> > CompUsa sells them on-line if you can't find them) and I get 2.4
> > MB/sec transfer rate to and from my Myth box. These are ethernet to
> > wireless bridges, not wireless adapters, which is the best since you
> > don't have to mess with wireless drivers - you just take all your
> > bridges to one place, connect them to a PC one by one, configure them
> > all, one as a WAP and the rest as bridges, and then connect them to
> > any ethernet-enabled device, and with no changes to the device you're
> > now connected to wireless.
> >
> > Fedor
> >
> >
> >         For streaming from the backend to the frontend (aka accessing
> >         via NFS?) it appears it will exceed Ethernet speed and require
> >         fast ethernet. I don't have cable run, so my question is, for
> >         a strong signal, is it reasonable to expect a quality stream
> >         over 54 Mbps wireless-g or is running CAT5/6 a better bet?
> >
> >         Thanks!
> >
> >         _______________________________________________
> >         mythtv-users mailing list
> >         mythtv-users at mythtv.org
> >         http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> >
> >
> >
> >
> >
> > --
> > Fedor G Pikus (fpikus at gmail.com)
> > http://www.pikus.net
> > http://wild-light.com
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> 
> 
> 
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> 


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