Ericsson LBI-39224 - Manual (Page 313)

LBI-39224
G-1
Glossary of Terms
Aegis
Aegis is Ericsson's digital voice audio system that employs advanced
Digital Signal Processing (DSP) circuitry. Aegis has two primary
modes – "Aegis digital" and "Aegis private." Aegis digital mode
offers improved weak signal performance and impedance to
unauthorized monitoring when compared to standard analog (clear)
voice transmissions. Aegis digital transmissions are not encrypted.
Aegis private mode also offers improved weak signal performance.
In addition, since Aegis private transmissions are encrypted, Aegis
private mode provides very secure communications against
unauthorized monitoring.
Audio Board
The Audio Board routes audio, mobile data, and Aegis data between
EDACS radio systems, dispatch consoles, logging recorders, etc.
The board digitizes analog signals applied to its audio inputs and
applies the digitized signals to the TDM bus. It performs the reverse
process for its audio outputs.
bit error rate
The average rate of errors on a radio channel, usually expressed as a
percent (e.g., a 5% error rate indicates an average of 1 error in every
20 bits transmitted).
C3 Maestro
The C3 Maestro is the CRT-type console that is designed to take
advantage of the advanced features of EDACS. It consists of a
specialized audio unit and an IBM PC compatible computer running
custom software developed by Ericsson.
Call Director
A Call Director (CD) is optional hardware equipment interconnected
to a dispatch console such as the C3 Maestro. It interfaces a console
to a telephone network.