User Manual

Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
2-6
REMOTE ALARM
D01-014
Figure 2-7. The D-Type Connector For CDU Remote Alarm Outputs
InCell ™ Enhanced Remote Antenna Unit (ERAU)
The Enhanced Remote Antenna Unit (ERAU) is the InCell™ component that is distributed
within a building to provide the RF signal interface to the mobile phones. The ERAU interfaces
to small indoor antennas to transmit the downlink signal to the mobile and to receive the uplink
signal from the mobile phone. Typical in-building distributed antenna systems consist of
multiple ERAUs connected to the CDU. ERAUs are generally hidden above a ceiling, behind a
wall or placed in rafters. Refer to Figure 2-8 for a picture of the ERAU.
The ERAU weighs 23 pounds and is 5.77” x 20” x 16.72”.
ERAU features are listed below:
• The ERAU provides high output power and low sensitivity to cover large areas
• The ERAU is small and easy to install in ceilings, on walls, poles, rafters
• Uses Type N female connector for input/output interface to antennas
• Accepts remote power or local power from DC power supply
• ERAU operates from a wide range of DC inputs: uses +40 to +60 VDC
ERAU RF Interface
The ERAU RF interface is through 2 Type N connectors located at the bottom panel of the
ERAU. One RF connector passes RF downlink signal from the base station to the mobile phone
and the other passes RF uplink signal from the mobile phone to the base station.
The ERAU is typically connected to an indoor omni or directional antenna. For flexibility, the
ERAU can also be connected to a leaky feeder cable such as the Andrew RADIAX® or Andrew
Flat Strip RADIAX®. In addition, the ERAU RF port may be connected to a two or 4-way
power divider/combiner and used to interface to multiple antennas.