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8.2.4
Losing a Streaming Connection
If a streaming connection is lost - for example, the sending device goes offline or you remove the network cable -
then audio stops passing. However, the connection is still prepared. This means that as soon as the stream re-
appears on the network - for example, the sending device comes back online or is reconnected - audio will be re-
established.
8.2.5
Configuring Redundant Streaming
POWER CORE supports two redundancy mechanisms: hitless switching (SMTPE 2022-7) and LACP (Link
Aggregation Control Protocol).
Hitless Merge / Seamless Protection Switching (SMPTE 2022-7)
Hitless Merge (or SPS) is a method of redundancy which employs two different networks (i.e. routes) to transport
data. If one "route" fails, then the other can be used to recover the missing data.
The standard is defined by SMPTE 2022-7.
SPS has been implemented into the POWER CORE configuration and the goal has been to make this as simple
as possible. SPS adds stream redundancy on the physical level in that two streams carrying the same data are
transmitted independently on the 2 RAVENNA NIC's. The degree of redundancy can be up to the level of two
physically independent networks with their own PTP down to simply two ethernet cables plugging into the same
switch. Each stream is given its own multicast address and even though transmitted via different paths this
information is captured in the SDP that accompanies both streams. The receiver or subscriber thus knows of the
existence of the other stream and internally rebuilds any missing data.
To create a Hitless Merge enabled stream, set the Devices field to ra0+ra1 in the
the 'Tree Definition':
These are referenced in several of the
The Statistics pages refers to the devices as Primary and Secondary.
LACP (Link Aggregation Control Protocol)
LACP is a networking protocol supported by some network switches and routers.
It can provide redundancy by "bonding" or "teaming" physical ports together to form a single logical channel.
Enabling LACP not only provides redundancy but can also increase throughput, although the usage here is the
former. A single IP address is configured and LACP enabled via the Web UI
Note that the connecting network infrastructure needs to support LACP for this to function properly.
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Web UI
pages relating to RAVENNA and are typically called Device ID's.
Version: V6.0.0/5
8. Audio IO
RAVENNA Output
branch of
System -> Network Devices
POWER CORE User Manual
page.
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