User Manual

Installation and Operator Handbook Introduction
AMX–MA–00651 Issue 0.02 (USA)
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Figure 1-2 Rear View - DRB-25
The DRB-25 provides one or two independent radios in a single package. Each radio can be used as a base
station or a repeater, and may be configured to support both APCO Project 25 compliant digital subscribers as
well as providing backwards compatibility to analog users. This means that existing mobile radio equipment
need not be immediately retired.
Each radio may be configured to provide an analog interface (2 wire with loop or ground start or 4 wire with
E & M signaling) to the public switched telephone network (PSTN), to a private branch exchange (PBX), or
to existing tone based remote control units.
The DRB-25 provides the key elements of an APCO Project 25 RF Sub-system including the air interface
(Um), interfaces for telephone and PBX interconnect (Et) and host data systems (Ed). Support for Ethernet
based network management, digital consoles and the APCO Project 25 fixed station interface (Ef) will be
available as software upgrades.