Polycom V500 Image quality help neded

Polycom V500 Image quality help neded
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Subject Author Date
Polycom V500 Image quality help neded Nigel Heald 05-26-2005
Posted by Nigel Heald on May 26, 2005, 4:02 pm
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Hi

We have a pair of Polycom V500's running between Devon and London via our
ADSL Broadband and the picture/sound quality varies between excellent to
lousy, main problem is its lousy most of the time. Has anybody used the
V500's in the UK with a ADSL broadband connection, and had a similar
problem? if so how did you fix it? Given that the V500 is supposedly able
to run on ISDN it should be fine on Broadband given that broadband uploads
at 256 compared to 128 of ISDN

Any help gratefully appreciated

Nige

--




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Posted by NetSteady on May 27, 2005, 4:53 am
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Nigel,

First, when they say it'll run on ISDN, normally they're talking about
a 384k bonded ISDN connection. So the bandwidth you're using is
actually less than normally used.

You have to also remember that your video connection takes the
bandwidth you select plus 20%. Try using the 128 speed, and see if the
H.264 video compression takes over and gives you a better quality.

Chris



Posted by René on May 27, 2005, 3:17 pm
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>Nigel,
>
>First, when they say it'll run on ISDN, normally they're talking about
>a 384k bonded ISDN connection. So the bandwidth you're using is
>actually less than normally used.
>
>You have to also remember that your video connection takes the
>bandwidth you select plus 20%. Try using the 128 speed, and see if the
>H.264 video compression takes over and gives you a better quality.
>
>Chris

Exactly - my experience showed me that selecting a lower BW usually
yields *better* quality - compared to selecting a very high bandwidth,
and wait until the auto-adaptive routines finally settle on a speed
that actually works.
I have a 512 Kb/s uplink, but usually this speed is not sustained,
somewhere there is always a bottleneck. Fixing the speed to 256 or 312
gives instantanuous fair quality - and, as the other poster mentioned,
the application might select H264 to boost quality.

FWIW, trials with e.g. Polycom PVX @ H264 @ 256Kb/s yield quite
acceptable sustained full screen quality over the public IP network.


--
- René


Posted by Camtrek on June 8, 2005, 12:05 am
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There is a simple solution www.camtrek.com fast easy video conference for
$15.00 a month.

Sincerely
Neil L. Rideout
Multicast Engineer
Video Conferencing Consultant
Inventor - Comcaster, P/See Suite, Sincewas, and Camtrek
www.neilrideout.com
and most importantly
www.camtrek.com

> Hi
>
> We have a pair of Polycom V500's running between Devon and London via our
> ADSL Broadband and the picture/sound quality varies between excellent to
> lousy, main problem is its lousy most of the time. Has anybody used the
> V500's in the UK with a ADSL broadband connection, and had a similar
> problem? if so how did you fix it? Given that the V500 is supposedly able
> to run on ISDN it should be fine on Broadband given that broadband uploads
> at 256 compared to 128 of ISDN
>
> Any help gratefully appreciated
>
> Nige
>
> --
>
>




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