July 2015 - Ed.1.2
E430 IP music and announcements server. User’s manual
Page 3
Chapter 2 : Functionality
2.1
Audio source types
The E430 server can transmit sound from mp3, ogg, wma and wav audio files. Some of them may require a
conversion, which is automatically made when transferring them from a PC.
2.2
Announcements, scheduled and BGM – RTP generators
The E430 server can send audio files over a RTP network to up to 100 different destinations in three different
qualities:
G711/A:
This is the recommended quality for voice transmission, it sends audio with a bitrate of 64 kb/s (8 bits
per sample, 8000Hz sample frequency). It is one of the most commonly used standards in VoIP
technology.
PCM 11025 Mono:
This is the recommended quality for music transmission and data bandwidth saving, it sends audio with
a bitrate of 176,4 kb/s for each destination (16 bits per sample, 11025Hz sample frequency).
PCM 32000 Mono:
This is the recommended quality for music transmission, it sends audio with a bitrate of 512 kb/s (16
bits per sample, 32000Hz sample frequency).
MP3:
This is the higher quality available, it sends mp3 audio with a bitrate up to 192 kbps (16 bits per
sample, 44100Hz sample frequency).
2.3
BGM - Icecast generators
Up to 6 different radio stations with mp3 quality can be generated, each one of them supports up to 100
clients, but network bandwidth has to be considered, depending on the qualities:
64 kbps stereo
(per client)
96 kbps stereo
(per client)
128 kbps stereo
(per client)
192 kbps stereo
(per client)
Source quality.
It sends the mp3 files without converting them, provided they have constant bitrate
with a bitrate up to 192 kbps
