IQOYA *CALL - IQOYA *CALL/LE
User Manual v0.99
APPENDIX G: AVAILABLE FEC
FEC (Forward Error Correction) is a mechanism which consists in sending redundant information (redundant
frames) to the decoder so that it can compensate packet transmission errors on unreliable networks.
An FEC can be selected when defining the parameters of the stream to be generated and/or to be received.
FEC requiring no additional stream
Redundant frames are sent in the same stream as the IP audio stream.
The FEC to be selected is “+50% bandwidth, recovery 2, 1 stream (audio)”.
Its characteristics are: +50% bandwidth, additional delay of 2 frames, recovers 1 lost packet at 100%, recovers 2
consecutive lost packets at 75%.
FEC requiring an additional stream
Redundant frames are sent as a second stream of data. The used port is by default: port of the IP audio 2.
Selectable FECs are:
●
+100% bandwidth, recovery 3, 2 streams (audio + FEC)
+100% bandwidth, additional delay of 1 frame, recovers 2 consecutive lost packet at 100%, recovers 3
consecutive lost packet at 75%
●
+100% bandwidth, recovery 4, 2 streams (audio + FEC)
+100% bandwidth, additional delay of 4 frames, recovers 3 lost packet at 100%, recovers 4 consecutive
lost packet at 80%
●
+50% bandwidth, recovery 1/2, 2 streams (audio + FEC)
+50% bandwidth, additional delay of 1 frame, recovers 1 lost packet over 2 consecutive packets.
●
+33% bandwidth, recovery 1/3, 2 streams (audio + FEC)
+33% bandwidth, additional delay of 3 frames, recovers 1 lost packet over 3 consecutive packets.
●
+25% bandwidth, recovery 1/4, 2 streams (audio + FEC)
+25% bandwidth, additional delay of 4 frames, recovers 1 lost packet over 4 consecutive packets.
●
+20% bandwidth, recovery 1/5, 2 streams (audio + FEC)
+20% bandwidth, additional delay of 5 frames, recovers 1 lost packet over 5 consecutive packets.
●
+10% bandwidth, recovery 1/10, 2 streams (audio + FEC) – From firmware 2.31
+10% bandwidth, additional delay of 10 frames, recovers 1 lost packet over 10 consecutive packets.
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Summary of Contents for IQOYA CALL Series
Page 18: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 INSTALLATION 18 77 ...
Page 26: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 CONFIGURATION 26 77 ...
Page 52: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 MAKING CONNECTIONS 52 77 ...
Page 63: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 63 77 ...
Page 64: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 SPECIFICATIONS 64 77 ...
Page 68: ... IQOYA CALL IQOYA CALL LE User Manual v0 99 APPENDIX 68 77 ...