Introduction - Ericsson EDACS MDX Operator's Manual

This manual describes how to use the EDACS MDX Mobile Radio. The
MDX is a synthesized, microprocessor-based, high performance simplex
mobile FM radio providing reliable two-way communications in both the
GE-MARC and Enhanced Digital Access Communications System (EDACS)
trunking environments. If your MDX is equipped with the Aegis™ Digital
Voice or Encrypted Digital Voice option, the GE-MARC mode of operation is
no longer available. The radio also operates with non-trunked or conventional
communications systems. Direct mobile to mobile communication, when out
of repeater range, is also provided.
In an EDACS trunked environment the user selects a communications
system and group. In this mode, audio channel selection is transparent to the
user and is controlled via digital communication with the system controller.
This provides advanced programmable features and fast access to
communication channels.
In a GE-MARC trunked environment the user selects a communications
area and group. In this mode, audio channel selection is automatic and is
controlled via tone signalling.
In the Conventional mode, the user selects a channel and directly
communicates on that channel. In this mode, a system refers to a set of channels
and a channel is a transmit/receive radio frequency pair.
In either the EDACS or Conventional modes of operation the user can
program some or all of the talk groups or channels to transmit and receive Aegis
Digital Voice or the highly secure Aegis VGE Encrypted Digital Voice. Aegis
is a high quality voice coding algorithm allowing for easy voice recognition.
The exact operation of the radio will depend on the operating mode, the
radio's programming, and the particular radio system. Most features described
in this manual may be enabled or disabled through programming. Consult the
system administrator for the particular features that are programmed into your
MDX radio.
8

INTRODUCTION