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

[Brian McEntire]

Wow! Thanks all for the great responses!

I think I will bite the bullet and run CAT 5e/6. It will be more 
construction, but in then end, I will either have a reliable video stream or 
else I'll at least be able to rule out networking as a probable cause. 
Thanks for the tips!

On 9/6/05, David Whyte <david.whyte at gmail.com> wrote:
> 
> 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
> > > _______________________________________________
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> > > mythtv-users at mythtv.org
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> >
> >
> >
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> >
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> >
> 
> 
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