This might be a clue:
PIM Sparse Mode (PIM-SM) is a multicast routing protocol designed on the 
assumption that recipients for any particular multicast group will be sparsely 
distributed throughout the network. In other words, it is assumed that most 
subnets in the network will not want any given multicast packet.

From: Steven Kenney via AF 
Sent: Wednesday, February 23, 2022 2:32 PM
To: AnimalFarm Microwave Users Group 
Cc: Steven Kenney 
Subject: [AFMUG] Multicast Over Wireless

So we are delivering IPTV unicast at the moment but I do have the ability to 
receive all the multicast streams.  So I had been toying with the idea of 
actually using Multicast over wireless.  

I can get the multicast to the towers without an issue.   Once it hits a 
Cambium AP (either 450 or ePMP) I'm not entirely sure how I can deliver this to 
my customers because the totality of the streams are in excess of 1Gbps.  So 
being a bit new to multicast it makes me wonder how you could get an end user 
device to join a multicast stream...without a set top box. 

So we use Fire Sticks,  Roku, Apple TV all over the top.  I don't think the app 
even supports multicast yet.  But I've been told it can be done, potentially at 
the router.  

Is this madness or is it really possible?  How would a home router be able to 
convert and request joins of streams and deliver it unicast to multiple devices 
in the LAN? 

I definitely need to read up in IGMP in detail as to its sparse and dense 
modes.  Right now we'd be receiving it all in dense mode.  

Anyone out there actually successfully deliver multicast via Cambium at this 
scale? (over 1Gbps stream data) 

-- 


            


                          
     

          Steven Kenney

          158 Erie Street. N, Leamington

           st...@wavedirect.org | wavedirect.net


           519-737-9283
     




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