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16 APPENDIX E: REDUNDANT DUAL STREAMING FOR RTP STREAMS (AUDIO
OR UNCOMPRESSED MPX)
Spatial diversity
IQOYA X/LINK can be configured to send the same AoIP stream on two distinct networks, typically through Eth0 and Eth1
interfaces. On the decoding side, IQOYA automatically synchronises both received streams. Using separate network paths
ensures that potential network failures are statistically uncorrelated, enabling the reconstruction of a unique unperturbed
stream.
Terminology used for the two redundant streams is: primary stream, and FEC "dual" stream for the duplicate stream.
Time diversity
IQOYA doesn't only propose passive duplication as on most codecs. It also allows delaying the duplicate stream compared
to the primary stream. Although the primary stream and the FEC stream are configured to use different networks, it is quite
common that some network components are common to both networks (last mile router for instance). The selected delay
avoids that temporary failures occurring on common network components impact both a primary frame and its duplicate
frame.
Multicast and unicast can be used for redundant dual streaming, and different UDP ports can also be used for the primary
stream and the FEC stream.
A typical redundant dual streaming configuration is as follows:
●
Enter the destination IP address and UDP port of the primary stream. The IP address can be the public IP address of
the Eth interface of the IQOYA that decodes the stream, or a multicast address. Select the IP interface used to send
the stream in case of multicast.
●
Select a "Dual stream" FEC, with or without time delay. Enter if necessary the destination IP address and UDP port
of the FEC stream. The IP address can be the public IP address of another Eth interface of the IQOYA that decodes
the stream, or a multicast address. Select the IP interface used to send the FEC stream.
IQOYA X/LINK-MPX user manual
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