Redundant Dual Streaming; Spatial Diversity; Time Diversity - Digigram IQOYA TALK User Manual

APPENDIX D

Redundant dual streaming

Spatial diversity

IQOYA 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 synchronizes 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 Ethernet 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.
IQOYA TALK
Portable IP audio codec
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