User Guide

NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 2-31
make sure that IGMP packets only open up the stream from that source. This is a change
from previous versions of software.
Note: Having two NETNodes set to the same multicast address will cause both to stream
(even if RTSP modes are selected) which is wasteful of bandwidth.
Step 6: Check the SAP Address
This text box enables you to change the value of SAP/ SDP multicast address used by the
unit.
The default value is 224.2.127.254 and the port used is 9875.
These are standard multicast values for such parameters, and it is recommended they are
not changed unless specifically required due to routing restrictions.
Step 7: Check the Port
A good rule is to use numbers above 10,000 to avoid conflict with existing services.
When you set up a port number on several computers on a network they will all listen for
packets directed to that port.
Step 8: Configure the Service Name
This text box lets you name the multicast stream as delivered in the SAP/SDP packets from
the unit. Default is MPEG Stream.
2.9 About RTSP Streaming
Real Time Streaming Protocol (RTSP) allows automatic control of the routing through the
mesh system. To use this feature the streaming protocol box must be set to the same RSTP
multicast or Unicast modes for all nodes in the system (this will happen if the Update all
nodes checkbox is checked).
The streaming protocol is selected on the Global Settings tab – see Chapter 10-5 Working
with the Global Settings Tab for details.
To access a stream on an AVI unit the URL is as follows:
rtsp://<ip_address_of_AVI_unit>/stream.sdp
This will automatically set the internal destination masks of the AVI node and the endpoint
node (the node where the data emerges from the Ethernet) to the correct values. The
destination values displayed in the destination mask on the Configuration Tab no longer have
any effect in this mode of operation.
If necessary the endpoint node will convert the multicast RTP packets to unicast (and remap
the port numbers) if the Software player does not support multicast streaming. Unicast can
also be forced by setting the mode to RTSP Unicast. The Mesh always uses multicast packets
internally as this is more bandwidth efficient when reaching multiple destinations.