User Guide
NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 2-30
2.7 Understanding Streaming Over IP
Streaming is the transmission of digital audio or video or the listening and viewing of such
data without first storing it.
This section is relevant only to customers that have the NETNode-AVI-UP option fitted into
their NETNode unit.
The NETNode supports:
Raw Multicast streaming
RTSP/RTP streaming.
2.8 Configuring Multicast Streaming
For multicast streaming the transport stream video data is transmitted over the Ethernet
network by means of multicasting i.e. continuous real-time streaming of packets accessible
to any PC connected to the network.
It is thus possible for more than one connected PC to view the streamed data
simultaneously.
Two types of multicast IP packets are streamed:
Packets carrying video, audio and data as received by the unit.
Packets known as Session Announcement Protocol and Sessions Description Protocol
data (SAP and SDP), which contain information regarding the nature and location of the
stream itself.
Step 1: Open the Configuration Tab Streamer Pane
When you have got a Video or Audio product into the NETNode, you can wish to stream that
information down a fixed IP link. The Configuration Streamer pane enables you to
configure this facility easily.
In Cobham systems we have the ability to carry streams using multicast protocols and these
streams can come from external or internal sources. This is controlled by the Source Mask.
To make sure we don’t overload the bandwidth we wish to be able to choose which nodes
get to receive the stream. This is controlled by the Destination Mask.
Step 2: Setup the Service Name
Textual information naming the multicast stream as delivered in the SAP/SDP packets from
the unit. The default setting is Mesh Streaming
Step 3: Stream Enable
This function enables the streaming of Video that originates from the internal encoder (if it is
fitted). This must be set to On for UDP multicast, RTSP multicast streaming or RTSP unicast
streaming.
Step 5: Check the Multicast Address
This text box enables you to change the multicast address used by the unit. Different
NETNodes (even if they are on separate MESHs) should have different multicast addresses to