CobraNet, ACU16-C & NHB32-C Guide
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1 CobraNet
CobraNet in a Nutshell
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CobraNet in a Nutshell
Developed by Peak Audio, a division of Cirrus Logic, Inc., CobraNet technology allows
real-time uncompressed digital audio distribution over industry-standard 100Base-T Ether-
net networks. Up to 128 channels, 64 in each direction, can be carried simultaneously over a
100Base-T network (64 channels on repeater networks). Fiber-optic cables support distances
of up to two kilometers.
CobraNet currently supports a 48 kHz sampling rate with 16, 20, or 24-bit resolution. Digital
audio is distributed in bundles, with one bundle per Ethernet data packet. A single bundle can
carry eight channels of 20-bit/48 kHz digital audio, or seven channels of 24-bit/48 kHz digital
audio.
CobraNet’s Serial Bridge feature allows serial data to be transmitted over the network. Nor-
mally, the ACU16-C and NHB32-C use the Serial Bridge to transmit amp control data. How-
ever, it can be used to transmit MIDI (Program/Control Change) or AD824 head-amp control
data between any two NHB32-Cs on the network.
CobraNet—the Technical Stuff
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hat is CobraNet?
Developed by Peak Audio, CobraNet is a network protocol for real-time uncompressed digital
audio distribution over industry standard 100Base-T Ethernet networks. TCP/IP (Transmis-
sion Control Protocol/Internet Protocol), the network protocol used on the Internet, is also a
network protocol. However, unlike that protocol, CobraNet technology includes a hardware
interface, namely the CM-1 CobraNet interface board manufactured by Peak Audio and
licensed to audio manufacturers for inclusion in their products.
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M-1 Interface
Peak Audio’s CM-1 is a compact,
low-power, CobraNet compliant
module that manufacturers can build
into their professional audio products.
It has two Ethernet ports—one for a
primary network connection, another
for a secondary, or backup connec-
tion. It can receive and transmit up to
32 audio channels simultaneously,
and supports a 48 kHz sampling rate
with 16, 20, or 24-bit resolution. It can
also drive Error, Conductor, and Link
status LED indicators. The CM-1
firmware can be upgraded via the
CM-1’s Ethernet ports.
The CM-1 interface module
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Summary of Contents for ACU16-C
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