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Page 128
A 128kbps MPEG Layer III with 50% FEC requires actually a 192kbps
bandwidth.
A 128kbps MPEG Layer III with 100% FEC requires actually a 256kbps
bandwidth.
Prodys recommends starting trials with 50% FEC, because this is the best trade-
off for the average WAN performance.
The user enables the FEC only at the Encoder side, since the Decoders takes
automatically advantage of the FEC information without explicit indication.
Following examples are given for different streaming arrangements:
The far-end codec has FEC enabled. The near-end codec has not. This
arrangement makes the audio decoding at the near-end codec more
reliable. The IP bandwidth requirement is asymmetric for both ends.
Conversely, the near-end codec has FEC enabled. The far-end codec has
not. This arrangement makes the audio decoding at the far-end codec
more reliable. The IP bandwidth requirement is asymmetric for both ends.
Both codes have FEC enabled. This arrangement makes the audio
decoding more reliable at both ends. The IP bandwidth requirement is
symmetric for both ends.
Summary of Contents for IP Family
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