QSC Audio S series - Manual (Page 6)

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AES3— A digital audio format specification approved by
the Audio Engineering Society and European Broad-
cast Union for inter-device conveyance of a dual-
channel (stereo) digital audio signal. Also called
AES/EBU. This specification is periodically revised
and amendments are published by the AES.
Bundle—The basic network transmission unit under Cobra-
Net. Up to 8 audio channels may be carried in a
bundle. Each bundle is assigned a unique number
and its value denotes the distribution type, either
multicast or unicast, between RAVE devices. A
bundle can be thought of as a virtual cable between
two or more RAVE devices, which transports mul-
tiple audio channels. Bundle numbers can be as-
signed to the RAVE via its front-panel interface or
through an SNMP supporting browser or related ap-
plication.
Channel—A single digital audio signal. Audio channels on
CobraNet have a 48 kHz sampling rate and may
be of 16, 20 or 24-bit resolution. Up to 8 audio
channels may be carried in a bundle.
Conductor—The CobraNet device on the network which sup-
plies the master clock and permissions list. A con-
ductor arbitration procedure insures that there is
one and only one conductor per network at any time.
Crossover cable—An Ethernet patch cable with the transmit
and receive wire pairs swapped at one end. Cross-
over cables permit a direct connection of two nodes
without a repeater or switch in between. A cross-
over cable can also be used for cascading repeat-
ers or switches that don’t have an available uplink
port.
INTRODUCTION:
Glossary
Latency—The time interval from when an event occurs and
when it is perceived. In digital audio routing, this is
typically the time required to convert an analog in-
put to a digital signal, transmit that signal over the
network, receive it and convert it back to analog for
the end listening device. Latency is dependant upon
every device in the signal chain that adds any time
delay to the delivery of the audio.
Management Interface—The management interface (MI) can
be thought of as the software and front panel con-
trols that determine how the RAVE will operate. The
MI is the means for control and monitoring of
CobraNet parameters within the RAVE unit. Two
main management methods are supported by
CobraNet; the host management interface (HMI)
and SNMP. RAVE supports SNMP and its front panel
switches for control. A RAVE unit can use its front-
panel thumbwheel switches to access most con-
figuration parameters for stand-alone mode. The
front-panel interface will satisfy most configuration
requirements. All of RAVE’s configuration param-
eters are accessible using SNMP.
MI Variable Set— The MI variable set is the group of param-
eters that can be controlled by the MI.
Multicast Bundle—A multicast bundle supports a one-to-
many routing of audio on the network. Ethernet
multicast addressing is used to deliver a multicast
bundle. Because a multicast bundle consumes band-
width network-wide (within the same broadcast do-
main), use of this delivery service must be rationed
on a switched network. By design, all bundles on a
repeater network are of the multicast type.