Overcoming Latency; Channels And Streams - PRESONUS StudioLive Series III Networking Manual

1 Overview
1.4

Overcoming Latency

Overcoming Latency
1.4
1.5

Channels and Streams

AVB STREAM
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
SRP works with the 802.1Qav Queuing and Forwarding Protocol (Qav) to ensure that
once bandwidth is reserved for an AVB stream, it is locked down from end to end.
Qav schedule time-sensitive streaming information to minimize latency. Together,
SRP and Qav make sure that all reserved media streams are delivered on time.
In this way, the AVB network has some intelligence as to how much non-media
traffic as well as how many media packets are on the system at any given
time. This means that on an AVB network, the worst case travel time is known
throughout the entire system. Because of this, only a small amount of buffering
is needed, lowering latency to 2 ms over seven switch hops on a 100 Mbps
Ethernet network. On gigabit networks, even lower latencies can be achieved.
AVB Streams can be thought of as the pipeline that carries a predefined
number of channels between two or more AVB devices. In a PreSonus
StudioLive Series III mixer, for example, there are seven input streams and
seven output streams are available, each carrying eight channels.
It should be noted that each stream can carry any combination of eight channels.
StudioLive™ Series III
AVB Networking Guide
8