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= Songcast OHM/OHU Protocol Specification (Version 1.0) =

== Introduction ==

OHM and OHU, together with [[Av:Developer:Songcast:Ohz|OHZ]], form a family of OpenHome protocols for the transport of audio around a home network. 

* OHM provides large scale one to many communication using multicast UDP. 
* OHU provides small scale one to many communication using unicast UDP.

== Message Format ==
The OHM and OHU protocols share the same message format.