Tieline Merlin PLUS User Manual page 273

With Tieline codecs you can configure either a fixed or automatic jitter buffer and the settings you
use depend on the IP network over which you are connecting. Over LANs, WANs and wireless
networks the automatic jitter buffer generally works well. It adapts automatically to prevailing IP
network conditions to provide continuity of audio streaming and minimize delay.
A fixed jitter buffer is preferable over satellite connections to ensure continuity of signals.
CAUTION: If a Tieline codec connects to a device that is using non-compliant RTP streams
then the last fixed setting programmed into the codec will be enabled (default is 500ms).
Non-compliant devices include some other brands of codec, web streams and other
devices.
Tieline 'Auto Jitter Buffer' Settings
Least Delay: This setting attempts to reduce the jitter buffer to the lowest possible point, while still
trying to capture the majority of data packets and keep audio quality at a high level. This setting is
the most aggressive in adapting to prevailing conditions, so the jitter buffer may vary more quickly
than with the other settings. It is not recommended in situations where jitter variation is significant,
or occurs in bursts. (E.g. cellular/multi-user wireless networks). It is best for stable and reliable links
such as dedicated or lightly-loaded WAN/LANs.
Highest Quality: This setting is the most conservative in terms of adapting to reduce delay. The
jitter-buffer will remain higher for a longer period after a jitter spike is detected – just in case there
are more spikes to follow. This setting is best used where audio quality is the most important factor
and delay is not as critical. Unless delay is irrelevant, this setting is not recommended over peaky
jitter networks (e.g. cellular networks) and is best used on more stable networks where fluctuating
jitter bursts are not common.
Best Compromise: This default setting is literally the midpoint between the jitter buffer settings
applicable for 'Highest Quality' and 'Least Delay'. It is designed to provide the safest level of good
audio quality without introducing too much extra delay. In most situations it will deliver very high
quality and low delay to support live bidirectional communications.
Good Quality and Less Delay: These two settings lie between the mid-point setting of Best
Compromise and two settings Highest Quality and Least Delay. They indicate a slight preference
and may assist in achieving better performance from a connection without incurring extreme delays
in transmission or packet loss.
Jitter Depth
The jitter Depth setting allows you to select predetermined minimum and maximum jitter settings
within the auto jitter buffer's minimum and maximum jitter limitations. The default setting of 60 to
1000ms is a good starting point for most networks. It may be necessary to increase the maximum
auto jitter latency setting for networks experiencing higher packet latency, or the minimum depth
depending on the reliability of the network.
Which Algorithms Support Automatic Jitter Buffering?
The following table provides an overview of which algorithms are capable of using the automatic jitter
buffer feature over SIP and non-SIP connections.
© Tieline Pty. Ltd. 2017
Merlin PLUS User Manual v2.0 273