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D
i
g
i
g
APPENDIX C: GLOSSARY
AUDIO CHANNEL
An audio channel is a single mono audio signal. By extension, an audio channel is one of the 64 slots of an
EtherSound frame, i.e. a signal sampled at 48 kHz with a 24-bit resolution.
DAISY CHAIN
The daisy chain is a network topology where all devices are linked "serially".
PRIMARY
PRIMARY
PRIMARY
PRIMARY
MASTER
MASTER
MASTER
MASTER
ES
ES
ES
ES
ES
SLAVE 1
SLAVE 1
dBV, dBu
Two different units expressing the voltage level using logarithms:
U
=
L
(
dBV
)
20
log
U
10
=
L
(
dBu
)
20
log
U
10
. 0
dBu is widely used in the pro audio world, whereas dBV is generally associated with consumer electronics
products. To fast and simply convert dBV to dBu, you may use L
approximate equivalent.
FRAME
A frame is a set of characters that are transmitted as an entity according to a defined format. The frame follows
a coding procedure at the physical level before emission. The EtherSound frame is fully compliant to the
Ethernet IEEE 802.3 standard.
GPIO
General Purpose Inputs Outputs. Each ES8 device has four GPIs and four GPOs. GPOs can be fully
configured to remotely control external devices. GPIs can be used to receive commands from external devices.
MASTER
A Master is a device contributing audio channels into the EtherSound network. It is located downstream from
the Primary Master.
A Master answers to the status requests and commands of the Primary Master. See also Primary Master.
20
r
a
m
ES
ES
ES
SLAVE 2
SLAVE 2
ES
ES
ES
SLAVE 3
SLAVE 3
ES
ES
ES
SLAVE 4
SLAVE 4
ES
ES
ES
SLAVE 5
SLAVE 5
ES
ES
ES
(
V
)
1
V
U
(
V
)
775
V
(dBu) ∼ L
(dBV) +2 to obtain an
U
U
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