AVB Endpoints vs Network Nodes

AVB Endpoints vs Network Nodes

Today we see what are the differences between an AVB endpoint (which are the AVB talkers and AVB listeners) versus an AVB compliant Network node (which connects those end-points to each other in an AVB network).

AVB is an Ethernet based Layer-2 Audio-Video bridging technology (from a Network perspective), however, any vanilla (or even high-end) Ethernet switch cannot be used to connect AVB devices, as it will not be able to provide the required Quality-of-Service though the network or be able to guarantee reservations required by AVB to operate. Let us first see how an AVB enabled Ethernet-switch is different

Normal Ethernet Switch AVB enabled Ethernet Switch
Provides Ethernet Switching capability
Can have 2 or more ports with different port-speeds
Provides MAC learning, switching, filtering etc
Supports VLANs, priorities & Multicast capability
Basically provides Ethernet Layer-2 connectivity
It needs to provide all the features
that a normal Ethernet Switch provides
N/A Needs to provide stream delivery guarantee
Has to synchronise and transfer clock
Support Stream Reservation protocol
Deliver Audio/Video payload without drops
Keep the latency within required margin
Communicate with other AVB nodes

As we see above, an AVB-enabled network gear is specialized in the way it operates and communicates with its peers. Now lets us see, how an AVB end-point is different from an AVB switch itself.

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