Streams
Distribution of data is done via UDP in an IP-based network. The maximum number of streams in a network is depending on the network infrastructure and also in the stream settings and can not be generalized. This page gives a brief summary of the technologies used.
Maximum Number of Streams (Packet Times)
The maximum number of streams depends on packet time configuration.
Without 52-8541 license
Packet Time | Packet samples (48 kHz / 44.1 kHz) | Maximum number of streams | Notes |
---|---|---|---|
125 microseconds | 6 | 16 | Compatible with class A AVB transport |
250 microseconds | 12 | 32 | High-performance, low-latency operation |
333 microseconds | 16 | 32 | Efficient low-latency operation |
1 millisecond | 48 | 32 | Required common packet time for all devices according to AES67 standard |
With 52-8541 license and redundancy disabled
With 52-8541 extended feature upgrade AES67 license and redundancy disabled.
Packet Time | Packet samples (48 kHz / 44.1 kHz) | Maximum number of streams | Notes |
---|---|---|---|
125 microseconds | 6 | 32 | Compatible with class A AVB transport |
250 microseconds | 12 | 64 | High-performance, low-latency operation |
333 microseconds | 16 | 64 | Efficient low-latency operation |
1 millisecond | 48 | 64 | Required common packet time for all devices according to AES67 standard |
With 52-8541 license and redundancy enabled
With 52-8541 extended feature upgrade AES67 license and redundancy enabled.
Packet Time | Packet samples (48 kHz / 44.1 kHz) | Maximum number of streams | Notes |
---|---|---|---|
125 microseconds | 6 | 16 | Compatible with class A AVB transport |
250 microseconds | 12 | 32 | High-performance, low-latency operation |
333 microseconds | 16 | 32 | Efficient low-latency operation |
1 millisecond | 48 | 32 | Required common packet time for all devices according to AES67 standard |
Service Discovery
The AES67 RAVENNA interface uses Zeroconf and SAP (Session Announcement Protocol) for service discovery and stream advertisement.
Encoding
The AES67 RAVENNA interface supports the following codecs as RTP payload formats, in which audio is digitalised and formatted:
Codec | Description | Defined in |
---|---|---|
L16 | 16 bit linear | RFC 3551 |
L24 - (Default) | 24 bit linear | RFC 3190 |
Tip
The AES67 RAVENNA interface additionally supports AM824 codec for decoding on RX side.
DHD Series 52 devices generally support sample rates of 44.1 kHz and 48 kHz. For more information on sample rates within RAVENNA AES67 interfaces, see Synchronisation.
Maximum Stream Channels
The AES67 RAVENNA interface calculates the maximum stream channels by packet time and encoding format. Another factor that must be considered is network MTU (Maximum Transmission Unit). The AES67 RAVENNA interface has a DSP limit of max 32 stereo channels per stream.
Streams page
To overview and edit streams, go to Streams
page in the web interface. Here you can enable streams and change settings on the TX side and on the RX side. To switch between TX and RX side, click TX STREAMS
or RX STREAMS
on top of the page. On touch enabled devices, you can also swipe with one finger to the left or to the right.
Note
This page is PIN protected, if PIN protection is enabled. See Installation and Maintenance for information on how to set up PIN protection.
Status colors for streams
The first column of the TX STREAMS
and RX STREAMS
table shows the number and the status of each stream. A stream status will only be shown if the stream is enabled. The following stream status indications are available:
Color | Description |
---|---|
Green | The stream is enabled and running without problems |
Yellow | Warning, but the stream is enabled |
Red | An error causes the stream to stay disabled |
Further information on the stream status can be reviewed in the Info
column.
Note
Stream status indications for enabled streams can also be seen on the Overview
page.