Operation and Maintenance Manual

385700-4006-006 INTRODUCTION
Document use is restricted to that described on cover 1-5
1.3 DESCRIPTION OF EQUIPMENT
The Radio Communications Network consists of Base and Mobile Radio Communication
Systems (RCS) and a Wayside Antenna System. The Distribution Line Amplifier (DLA) is part
of the distributed Wayside Antenna System based on leaky-feeder cable RADIAX
®
. DLA’s are
used to compensate for attenuation losses in the cable by providing bi-directional amplification
of signals. The DLA also includes a direction control signal and status signals to monitor
amplifier operation.
1.3.1 Type of Equipment
The DLA is a FCC approved bi-directional amplifier that is used with spread spectrum
transceivers that operate in the ISM 2400-2483.5 MHz frequency band. The 4 versions of the
DLA are shown in Table 1-1. The models differ in the number of RF ports and the type of
control interface.
Part Number Description
385700-4000-001 4 port amplifier with LONWorks™ Interface
385700-4000-002 4 port amplifier with dry contact Interface
385700-4000-003 2 port amplifier with LONWorks™ Interface
385700-4000-004 2 port amplifier with dry contact Interface
Table 1-1 – DLA Part Numbers
1.3.2 Purpose of the Equipment
The Distribution Line Amplifier provides selective frequency range amplification of both a
forward (downlink) and reverse (uplink) direction signals in RADIAX
®
cable. Forward is
defined as the direction of RF energy from the BDR at the wayside to the MDR. Reverse
direction is defined as the direction of RF energy from the MDR to the BDR. The signals that
appear on the line amplifier RF ports are determined by the USER controlled direction signal.