Configuring Forward Error Correction - Tieline ViA User Manual

158 ViA User Manual v2.0
Relationship between the Jitter Buffer and Forward Error Correction (FEC)
If forward error correction is configured then additional data packets are sent over a connection to
replace any lost data packets. There is no need to modify jitter buffer settings if you are sending
FEC data, only if you are receiving FEC data.
The jitter buffer depth on the receive codec needs to be increased if FEC is employed. We
recommend you add 100ms to the fixed jitter buffer on a codec receiving FEC at a setting of 20%
and 20ms at a setting of 100%.
Tieline's auto jitter buffer detects the amount of FEC that is being used and automatically
compensates to increase the codec jitter buffer when this feature is enabled.
29.5

Configuring Forward Error Correction

Forward Error Correction (FEC) is designed to increase the stability of UDP/IP connections in the
event that data packets are lost. FEC works by sending a secondary stream of audio packets over
a connection so that if your primary audio stream packets are lost or corrupted, then packets from
the secondary stream can be substituted to replace them. The amount of FEC required depends on
the number of data packets lost over the IP connection.
Both the local and remote codec FEC settings can be configured in your codec before dialing.
These settings can also be changed 'on the run' while the codecs are connected. FEC should only
be used if the Send/Return link quality percentage displayed on the codec is below 99, as it is of no
benefit otherwise.
Configuring FEC (Forward Error Correction)
1. Press the HOME button to return to the Home screen, then tap Dialer .
2. Tap FEC.
3. Tap to select the local codec's FEC ratio.
4. Tap to select the remote codec's FEC ratio.
© Tieline Pty. Ltd. 2017