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372 Genie Distribution WNET Manual v3
© Tieline Research Pty. Ltd. 2020
Configuring Tieline FEC in the Codec
1. Press the HOME button to return to the Home screen.
2. Use the navigation buttons on the front panel to select Connect and press the button.
3. Select IP and press the button.
4. Select Tieline and press the button.
5. Use the down navigation button to select Setup and press the button.
6. Navigate to FEC and press .
7. Select the local codec FEC setting in the Local FEC screen and press .
8. Select the remote codec FEC setting in the Remote FEC screen and press .
Important Note: FEC can only be configured for use with the Music and MusicPLUS
algorithms.
Configuring RFC 2733 FEC in the Codec (Sessionless Connections only)
1. Press the HOME button to return to the Home screen.
2. Use the navigation buttons on the front panel to select Connect and press the button.
3. Select IP and press the button.
4. Select Sessionless and press the button.
5. Select Peer-to-Peer and press the button.
6. Use the down navigation button to select Setup and press the button.
7. Navigate to FEC and press .
8. Select Enable and press .
9. Select the FEC Percentage and press .
10. Select the FEC Delay used by the codec and press .
Important Notes:
· The FEC Delay configured should take into account the packet arrival (jitter buffer)
strategy at the remote codec. For example, if the maximum jitter buffer at the remote
codec is 1000 ms, the FEC Delay setting should be lower, to ensure there is enough
time for FEC packets to arrive and replace lost packets prior to audio playout.
· By default, the codec will use the audio stream IP address as the remote FEC IP
address as well. This can be adjusted in the
Program Manager panel in the HTML5
Toolbox web-GUI.
· The default local and remote UDP audio FEC ports are 9002.
· Any of the available algorithms can be selected when configuring RFC 2733 FEC in the
codec.
How does FEC work?
If you enter a FEC setting of 20% and you are losing one packet in every five sent, the lost packet
will be replaced by FEC to maintain the quality of the connection. If you are losing more packets
than this, say one in three, it will be necessary to increase the FEC setting to 33% to compensate.
Note : There is an inverse relationship between FEC settings and the jitter-buffer millisecond setting
that you use for IP connections.
So why not use 100% FEC every time? The answer is because you need twice the bit rate to
achieve full redundancy and depending on the link conditions, this could potentially cause more