[SBE] Some IP Network questions

[Bo]

Hi Edwin,

As to your CNN streaming question, they and most everyone now use a content
delivery network or CDN to actually deliver multi-stream video to end users.
Usually the broadcaster will upload a single high quality stream and the CDN
then they transcode the original into a multitude of qualities and types to
be delivered to everything from Roku to the iPhone and everything in
between.  In doing this it has no ill effect on the internal network nor
production networks.  

 

I don't know of anyone doing multi-streaming from their own location.  I
believe the upload bandwidth would be prohibitive.  But if they did I'm sure
they would set it up behind a servicenet and keep the traffic separate from
the rest of the network.

 

I do agree with your friends statement that most network problems come from
"over management" and configuration problems.  Most IT types (in the real
world)  believe in maximum control, bandwidth throttling, and so forth.
They are used to dealing with word documents and email traveling over the
network, not high bandwidth massive video and audio files.  But in broadcast
houses the IT guys have to understand the needs for broadcasting, so I don't
think that issue is the same. 

A good resource for some info on this subject is www.streamingmedia.com

 

I'm not totally sure if that addresses your question, but I hope it helps.
On questions 2 and 3, I haven't been there yet, and am curious to see the
answers you get.

 

Willard "Bo" Bratcher

Louisville MetroTV

 

 

 

From: sbe-bounces at sbe.org [mailto:sbe-bounces at sbe.org] On Behalf Of Edwin
Bukont
Sent: Sunday, June 19, 2011 2:28 PM
To: sbe
Subject: [SBE] Some IP Network questions

 

For both the video and audio folks, questions.
 
1.  A friend, who is usually knowledgeable, made the statement that CNN
generates many IP streams, reliably, for public consumption and that my
concerns about network infrastructure  (Physical and Layers 1,2 and maybe 3)
are overblown.  He claims that the technology has come so far that as long
as you buy Cisco, HP, Juniper and focus on proper configuration (Layers
4-7), you can reliably do what you want.  He claims that network issues
rarely are at the lower levels and mostly now occur as a function of poor
config and management, not poor infrastructure.    My comment to him was
that how you handle IP / IPTV for post-production streams is a completely
different animal than how you handle IP connectivity concerns inside the
plant related to bi-directional workflow for production.   I would tend to
think that the integrity of the lower levels matters more for production
than for distribution.
 
 So I am curious, what is CNN doing and how does their use of IP technology,
complexity and network reliability concerns differ between production and
distribution?  Is CNN (as my Cisco buddy claims) more concerned now with
distribution rather than production because so much production now is
ingested from citizen journalism?  I don't believe that the brick and mortar
concerns of TV plants have really dimished that far, yet.
 
2.  Anyone tried use of 802.1(Qav et al) enabled switches yet in AOIP or
IPTV plants.  Such switches do exist already.  Are there broadcast
production devices encorporating these standards?  Anyone have experience at
how well these switches handle L3 QoS for packets not bearing AVB?
 
3.  Anyone using a wireless packet sniffer?  If so, what, besides Fluke, are
folks using?
 
Thanks
 


Edwin Bukont CSRE, DRB, CBNT 
E2 Technical Services LLC
Tech-Knowledgy for Signal Integrity
Nashville, Baltimore, Whereever
V- 240.417.2475; F- 240.368.1265

 







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