Appendix D: Glossary - Digigram Ether Sound ES881 Manuel Utilisateur

APPENDIX D: 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.
SWITCH
Device to connect two segments of a Local Area Network. Seeking greater filtering and forwarding speeds,
efforts were made to decrease the amount of time required to determine if a packet should be filtered or
forwarded ('latency') by only examining the address information contained at the start of the Ethernet frame.
The term 'Ethernet Switch' now is used for multiple-port-devices, which are able to filter and forward packets
at nearly the speed of Ethernet ('wire speed') regardless of the technique.
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
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.
PRIMARY MASTER
The first EtherSound device in the network is called the Primary Master. As well as being a source of audio for
the network, the Primary Master provides the commands and the clock for audio channel synchronization.
The Primary Master may also serve as the link between the EtherSound network and configuration software
running on an external computer, connected to its Ethernet FROM port.
EtherSound ES881, ES1241 & ES16161
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
Ethernet Audio Bridges
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