Yamaha HUB User Manual
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Glossary
NetworkAmp Manager—Owner’s Manual
Media converter:
A device that converts from one type of distribution media to another,
for example, Ethernet (100Base-TX) to fiber optic (100Base-FX).
Multicast bundle:
CobraNet bundles 1 through 255 are multicast bundles, which means
they are transmitted to all devices on the network regardless of whether any devices are con-
figured to receive them. Multicast bundles allow point-to-multipoint connections and can
be used with repeater hubs or switching hubs. Advantages include the ability to distribute
digital audio to any number of devices simply by configuring those devices to receive the
same bundle. Disadvantages are that all available network bandwidth is used, devices
receive all bundles and must decide for themselves whether to receive or ignore the data,
and any 10Base-T data ports (e.g., computers, printers, etc.) will be flooded with data. It can
be stressful for switching hubs, which must work hard to transmit all incoming data to all
output ports. Contrast with Unicast Bundle.
Network topology:
The structure of a network. Common network topologies include
star, ring, tree, and bus. Ethernet networks utilizing hubs are typically wired in a star topol-
ogy, although a network may consist of various topologies.
Performer:
The devices on a CobraNet network that are wordclock slaves. Performers
synchronize to the conductor. See also Conductor.
Repeater hub:
A basic network hub that retransmits all incoming data to all of its output
ports.
RJ-45 connector:
The type of connector used to connect 10Base-T, 100Base-T, and
1000Base-T Ethernet devices.
RS-232C:
A serial interface for connecting serial devices, offering a transmission dis-
tance of approximately 15 meters, typically using 9- or 25-pin D-sub connectors.
RS-422:
A balanced serial interface for connecting serial devices, offering a transmis-
sion distance of approximately 1 kilometer and higher data rates and greater immunity
to interference than RS-232C.
RS-485:
A balanced serial interface for connecting serial devices. Similar to RS-422 but
with support for multiple receivers and transmitters, offering bidirectional half-duplex
communications over a single twisted pair.
Sampling rate:
CobraNet supports a single sampling rate of 48 kHz.
Serial Bridge:
CobraNet’s Serial Bridge feature allows serial data up to 57.6 kbps to be
transmitted over the network. Due to the process of packetizing and re-serializing serial
data, data sent over the Serial Bridge is delayed approximately 10 milliseconds.
Straight Ethernet cable:
An Ethernet cable that is wired pin-for-pin (i.e., pin 1 con-
nects to pin 1, pin 2 to pin 2, and so on). Straight cables are used to connect Ethernet devices
to networks. You can easily tell whether an Ethernet cable is crossover or straight by looking
at the wiring of both connectors. If the wiring is identical, it’s a straight cable. If it’s different,
it’s a crossover cable. Contrast with Crossover Ethernet cable.
STP (Shielded Twisted Pair):
A cable consisting of two shielded conductors that are
twisted together.
Switching hub:
Sometimes referred to as a switch, switching hubs know the network
address of each device on the network and automatically route network traffic accordingly,
so each device receives only data addressed to it.