[EAS] Part 11 / Local CAP Relay Networks

[Harold Price]

David,

There is no one simple answer to that.

One could compute the overhead of the stream if sent with multicast 
UDP packets.  The overhead depends on the size of the UDP packet, 
which can be dependent on the underlying network.  A simple udp/ip 
header is 28 bytes, with 512 bytes of udp data it needs 94.8% of the 
bandwidth.

So you'd need a minimum of 67510 bps, add fuzz for best results, and 
a little less if you up the packet size, maybe 65240.  That's UDP 
over IP bandwidth.  There are more bits required at the physical 
layer, of course, and you'd want to use something that gave you some 
type of forward error correction, and some type of security. You'd 
need to tell whoever was providing the service that you need 68k of 
usable bandwidth.  The selection of 64k as the data rate was somewhat 
arbitrary, less is equally effective for voice.  It is very unlikely 
that anyone has used an mp3 decoder that is limited to 64k, but it 
would take a change to the profile/implementation guide to make a change.

Harold

At 04:42 PM 5/22/2011, David Ostmo wrote:
>Harold,
>
>How much bandwidth do you think is ideal size?
>
>David Ostmo