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showstack / protocols / cobranet

CobraNet

An early (1996) Ethernet-based digital audio distribution protocol from Peak Audio, now owned by Cirrus Logic, that predates Dante and AVB and is still found in legacy installed sound systems, amplifiers, and DSP hardware in venues and theme parks.

Audio transportProprietary, documentedCirrus LogicVerifiedHistorical

Stewarded by Cirrus Logic (formerly Peak Audio).

Media Large, continuous, on time and in order

Continuous streams that are large enough to be sized properly, and that must arrive in order and on time.

What kills it. Anything that starves the link — usually a management transfer nobody scheduled — and jitter that outruns the receive buffer.

What it carries

Sample rates
48 kHz, 96 kHz
Audio bit depth
16-bit, 20-bit, 24-bit
Audio channels
up to 64
Audio encoding
Linear PCM in eight-channel bundles

Audio: 64 channels each direction on 100 Mbit, in bundles of eight, which is the unit you route rather than the individual channel. 96 kHz halves the count. 20-bit is the historical default and still what a lot of installed hardware negotiates.

What goes wrong

Operates at Ethernet layer 2 using registered EtherType 0x8819 - it is not IP-routable and needs a dedicated or carefully VLAN-isolated switched network.
Requires a switched 100Mbit/s+ Ethernet network with one of three fixed latency settings (5.33, 2.67, or 1.33ms) configured correctly, or audio glitches result.
Largely superseded by Dante and AVB/Milan in new installs, so CobraNet is now mostly encountered in older fixed installations.

Sources

Something wrong, or missing?

Known gaps on this entry: default_ports, first_published, implementations. If you can source one of them, that is a ten minute pull request.

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