Omnia .9 Installation & User Manual page 184

SYSTEM MENU CHAPTER 23 |
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The Stream Mode selection lets you select the stream format. Standard uses 5 ms (240 samples) Livewire packets, which
minimizes overhead. Low Latency is used for AES67 compatibility, with each packet being 1 ms (48 samples). Please note that
the LW labeled output slots are not intended for low latency monitoring even if you select Low Latency mode. For Low Latency
monitoring, you must use the Studio output slot, described later.
The Source selection lets you select which Omnia.9 audio source to assign to the LW output slot you are configuring. This list
is identical to what you'd find when assigning a physical AES or Analog output, except it contains selections from both the
aforementioned signal types, as we cannot know from this end whether you will be using an analog or digital node at the other end.
The Studio output slot for low latency use works a bit differently from the normal LW output slots.
Due to the software-only Livewire implementation in Omnia.9 MKII, low latency operation has some restrictions. The source
must be a Livewire or AES67 stream, and the stream mode must be Low Latency (1ms, 1000 packets/sec) or Live (0.25ms,
4000 packets/sec), and this source must be selected as the Studio Source on the Input 1 page. If the source is a Standard
Livewire stream (5ms, 200 packets/sec), or a physical Omnia.9 output, the Studio LW output will not produce any output.
Furthermore, the outgoing packets are not buffered and re-clocked – there just isn't time for that. Instead, we process as
the input packets comes in, and send the output stream with the same format as soon as the audio for that packet has been
processed. This means that the output will have significantly more jitter than a "proper" livestream, and this can cause
problems for Livewire gear trying to receive it.