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© Tieline Research Pty. Ltd. 2020
Genie Distribution WNET Manual v3
6. Navigate to Jitter Buffer and press .
7. Select Auto Jitter Adapt and press .
8. Select your preferred jitter buffer setting and press .
Important Notes: There is no jitter buffer setting on a multicast server codec because it
only sends and never receives audio packets.
How to get the Best Jitter Buffer Results
When configuring automatic jitter buffer settings, establish the IP connection for a while before
‘going live’, to allow the codec to evaluate prevailing network conditions. The initial jitter buffer setting
when a codec connects is 500ms and it is kept at this level for the first minute of connection (as
long as observed delay values are lower than this point).
After the initial connection period the jitter buffer is adjusted to suit prevailing network conditions and
is usually reduced. Establish a connection for at least 5 minutes prior to broadcasting, so that the
codec has been provided with enough jitter history to ensure a reliable connection.
There are five jitter buffer states. Jitter buffer and connection status statistics can be viewed via
HOME > Cxns and use the down and up navigation buttons to scroll through
connection statistics. The first four stages are observed in “auto” jitter buffer mode.
1. Stabilization period (a1): A few seconds during which a stable connection is established.
2. Stage 2 (a2): A compatibility check occurs.
3. Stage 3 (a3): If the compatibility check is successful, this is the analysis hold-off period.
During a minute, the jitter buffer is held at a safe, fixed value of 500ms while enough history
is recorded to start jitter buffer adaptation.
4. Stage 4 “live” (A) : This is where the codec determines it is safe enough to start
broadcasting using the auto-jitter buffer level. We recommend running the codec for a few
more minutes to obtain a more comprehensive history of the connection’s characteristics.
5. Fixed (F): This state is displayed if the jitter buffer is fixed.
Fixing Jitter Buffer Settings
The default jitter-buffer setting in Tieline codecs is 500 milliseconds. This is a very reliable setting
that will work for just about all connections. However, this is quite a long delay and we recommend
that when you set up an IP connection you test how low you can set the jitter-buffer in your 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 your preferred IP Session mode and press the button.
5. Use the down navigation button to select Setup and press the button.
6. Navigate to Jitter Buffer and press .
7. Select Fixed Buffer Level and press .
8. Use the numeric KEYPAD to enter the fixed buffer value in milliseconds and press . Note:
Recommended maximum fixed jitter limits are as follows:
· 1,000ms for PCM and G.711, G.722 and aptX Enhanced encoding.
· 2,500ms for AAC ELD, AAC LD.
· 5,000 for all other algorithms including Opus, MP2, AAC, AAC-HE, Tieline Music and
Music PLUS.