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© Tieline Research Pty. Ltd. 2020
Genie Distribution WNET Manual v3
dropouts because of network congestion than it fixes. Here is a simple rule to remember: Your
maximum uplink speed is the maximum bandwidth you have to play with. As a rule of thumb, try not
to exceed more than 80% of your maximum bandwidth. If your link is shared, be even more
conservative.
You should also consider the maximum upload speed at the remote end too. Is the connection
shared at either end? Your bit rates, FEC settings and buffer rates must be pre-configured at both
ends before you connect, so it's always better to set your connection speed and balance your FEC
according to the available uplink bandwidth at each end for best performance.
As an example, if you want 15 kHz mono (using the Tieline Music Algorithm) you will need at least
a 24kbps connection for audio. Adding 100% FEC will add another 24kbps making your bit rate
48kbps plus some overhead of around 10kbps is required. If you're on a 64kbps uplink, you should
consider reducing your FEC to minimize the likelihood of exceeding your bandwidth capacity.
Here is another example, if you want 15 kHz stereo, you need at least 56kbps for the audio. 100%
FEC requires at least 112kbps and 50% FEC requires at least 84kbps. If your uplink speed is
256kbps and you're on a shared connection, then choosing a lower FEC setting of 20%-33% may
give you better results.
Conserving Bandwidth with FEC
There is a trade-off between the quality and the reliability of an IP connection – particularly when
FEC is activated on your codecs. However, it is possible in certain situations to configure different
FEC settings on each codec to match connection bandwidth capabilities at either end of the link,
conserve bandwidth and create more stable IP connections.
For example, if your broadcast is a one-way broadcast from a remote site, i.e. you are not using the
return path from the studio, or only using it for communications purposes, it is possible to reduce or
turn off FEC at the studio codec. This effectively reduces the bandwidth required over the return link
and increases the overall bandwidth available for the incoming broadcast signal from the remote site.
21.11 Configuring Encode/Decode Direction
By default the codec by is configured to both encode and decode data. However, it is possible to
configure the codec to either encode or decode audio data only. This is useful for:
·
Conserving connection bandwidth when unidirectional data streaming is required.
·
Lowering data costs.
·
Increasing overall connection reliability.
Configure the transmitting codec to encode only and program the receive codec to decode only
when using this feature. To adjust this setting:
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 .
4. Select your preferred IP Session mode and press the button.
5. Use the down navigation button to select Setup and press .
6. Navigate to Dir and press .
7. Select Encode Only or Decode Only and press .