June 2015 - Ed.2.1
Audio over IP decoders E411, E413, E415 & E417 technical manual
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Chapter 1: Introduction
The EQUITEL audio over IP devices family allows the transmission and reception of music channels and audio
messages over IP, using standard IP network hardware.
These devices provide a unified solution for transmitting audio signals such as background music, advertising and
informational messages, to one or more destinations.
By supporting multiple protocols and encoders, these devices are indicated in broadcasting applications, VoIP
and Internet radio. In addition to leveraging existing infrastructure and devices such as SIP phones.
Encoder (E421) sends audio input through the Ethernet network. This process is known as "streaming". Streams
can also be generated by other devices, like a PC running an application or a SIP phone.
The E495 and E497 desktop microphone consoles can also send vocal messages to the decoders for paging
applications. If more than one of these devices are used, they intercommunicate to avoid message collisions.
The E430 is a music and announcements server that can generate audio from internally stored files. It can be
used to generate background music channels and/or advertisements.
Decoders (E411, E413 or E415) can receive selected channels (i.e. "streams") from the network and convert it
back to an analog audio signal.
Mixer (E417), besides the same features than the decoders, includes the option to use audio coming from files
stored in a USB memory or analog signals in its MIC or LINE inputs.
The selection of the actual stream, local file or analog signal to be sent to the output is made based on a
powerful but very easy to configure priority schema.
The figure shows a schematic of this family of devices usage:
Figure 1: EQUITEL Audio over IP devices usage schema
