[comm] [Alma-comms] Minutes of meeting, task list

[Gene Runion]

> -----Original Message-----
> From: comm-bounces at donar.cv.nrao.edu [mailto:comm-
> bounces at donar.cv.nrao.edu] On Behalf Of Patrick P Murphy
> Sent: Friday, July 06, 2007 11:46 AM
> To: comm at nrao.edu
> Subject: Re: [comm] [Alma-comms] Minutes of meeting, task list
> 
> FYI... goings-on of the ALMA COMMs group.  Salient minutes extracted
> with [my comments to NRAO comm group thus]:
> 
> News for the COMMS team
> 
>    * Nicolas Ovando (did I get name right? - PPM) hired as Network
>      Engineer (Santiago).  [We should invite/add him to our comm list
>      and possibly meetings]
> 
>    * IP Traffic prioritization when phones used at antennas: test to
be
>      done at AIV/OSF [concern is that phone usage will interfere with
>      ALMA Software IP traffic; can we tweak the Cisco (managed)
routers
>      to lower the normally high QoS for VoIP?  Do we need to?]
> 

VoIP and video traffic isn't bursty, this is a key point to keep in
mind.  Assume the VoIP uses 70K bandwidth, the highest quality codec,
and you have two simultaneous calls then you are left with 1G minus 140K
of bandwidth for all other traffic.  If this results in a problem then
the whole design is extremely marginal and will not be stable.  The
amount of VoIP traffic to an antenna will be negligible and will not
interfere with other traffic; however other traffic could interfere with
VoIP if priorities aren't configured correctly.  


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