Yamaha HUB User Manual
Page 40
Glossary
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NetworkAmp Manager—Owner’s Manual
CobraNet:
Developed by Peak Audio, CobraNet technology allows real-time uncom-
pressed digital audio distribution over industry standard 100Base-T Ethernet networks. Up
to 128 channels, 64 in each direction, can be carried simultaneously over a switched
100Base-T network (64 channels on repeater networks). CobraNet supports a 48 kHz sam-
pling rate with 16, 20, or 24-bit resolution. CobraNet devices can happily coexist with net-
worked computers, printers, etc., on a switched 100Base-T Ethernet network, however, a
dedicated network infrastructure is strongly recommended.
CobraNet audio channel:
In CobraNet terminology, an audio channel is one 48 kHz
digital audio signal with a 16, 20, 24-bit resolution.
CobraNet primary/secondary ports:
CobraNet interfaces feature built-in redun-
dancy, with primary and secondary ports for connection to primary and secondary net-
works. If an unrecoverable fault should occur on the primary network, CobraNet
automatically switches to the secondary network, providing uninterrupted operation. Both
ports are transformer isolated and fully comply with the IEEE 802.3 standard.
Conductor:
The device on a CobraNet network that acts as wordclock master and net-
work arbitrator. Only one device can be Conductor at any one time. If that device is
unplugged or fails, another device automatically takes over as Conductor. The conductor
ensures that only one device transmits data in each bundle at any one time. See also Per-
former.
Crossover Ethernet cable:
An Ethernet cable whose data transmit and receive conduc-
tors have been swapped. Crossover cables are used to connect two Ethernet devices directly
to each other. They should never be used to connect devices to a hub. Contrast with Straight
Ethernet cable.
CSV:
Abbreviation for Comma Separated Value file. CSV files, which are commonly used
to exchange table-like data from spreadsheets and databases, use commas to separate the
individual values on each line. NetworkAmp Manager log files use the CSV format and can
easily be imported into a spreadsheet for further analysis.
Ethernet:
The most widely implemented network protocol. The first implementation
10Base-T supports data transfer rates of 10 Mbps. The next implementation, 100Base-T (or
Fast Ethernet) supports 100 Mbps. The newest version, Gigabit Ethernet, supports transfer
rates of 1,000 Mbps (i.e., 1 gigabit).
Fast Ethernet:
Also known as 100Base-T, the Ethernet standard that supports data trans-
fer rates of 100 Mbps. CobraNet runs on Fast Ethernet networks.
Gigabit Ethernet:
Also known as 1000Base-T, the Ethernet standard that supports data
transfer rates of 1,000 Mbps. CobraNet supports Gigabit Ethernet. A Gigabit switched net-
work can handle up to 1,028 CobraNet audio channels.
Hub:
See Repeater hub and Switching hub.
Isochronous:
Occurring at fixed intervals in time. Often used to describe real-time com-
munications between devices in which data must be delivered at regular intervals. Cobra-
Net transmits digital audio data isochronously. Contrast with Asynchronous.
LAN (Local Area Network):
A network that exists in the same building or group of
buildings. CobraNet is a LAN technology. See also WAN.
Latency:
A CobraNet network adds a fixed latency (propagation delay) to all audio data
that is conveyed over the network. You can select this delay from a range of 5.33 ms / 2.67
ms / 1.33 ms. However, decreasing the latency will intensify the limitations on Ethernet’s
packet delivery time, and will therefore decrease the maximum number of switches that can
be used. If you set the latency to 1.33 ms, the number of bundles that can be used by the
NHB32-C will be a maximum total of four for input and output. Also, while some applica-
tions will compensate for this, you will need to take into account this latency value when
calculating the appropriate delay time used to compensate for mic positioning or to elimi-
nate the Haas effect.
Managed hub:
A type of switching hub that improves network efficiency by segregating
a LAN into smaller virtual LANs.