User Manual

Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
2-3
CDU AC Power Interface
To allow operation in a wide number of applications and locations, the CDU operates from
international AC power. The CDU uses 100 to 240 VAC, 47 to 63 Hz. The CDU uses 10 watts
of power. When a full system with all six of the RAUs is connected, the CDU uses 40 watts of
power. When an external power supply for the ERAU is used, the CDU uses 10 watts of power.
CDU RF Interface
The CDU RF interface is through a Type N connector located on the rear panel of the CDU. The
Type N RF connector is a bi-directional RF interface that simultaneously passes the RF downlink
signal from the base station to the mobile phone and the passes RF uplink signal from the mobile
phone to the base station.
CDU Optical Interface
The CDU optical interface is through six sets of fiber optic connectors located on the front panel
of the CDU. The six remote antenna ports provide the uplink and downlink signal paths to the
six Enhanced Remote Antenna Units. Each optical port consists of a pair of fiber optic links.
The downlink path carries the optical signal from the base station to the ERAU for transmission
to the mobile phone. The uplink path carries the optical signal from the ERAU to the CDU to
transmit the signal from the mobile phone to the base station.
The CDU fiber optic ports are all SC/APC type connectors and the InCell DAS uses single mode
fiber optic cables to provide low loss, wide bandwidth signal capabilities.
CDU DC Power Output Interface
Each of the six CDU antenna ports can provide remote DC power to one RAU through a
composite fiber optic and copper cable. The CDU provides +24 VDC and GND signals through
the six power connectors located on the front panel of the CDU. To use these DC power ports to
provide power to an ERAU, two copper wires must be used, typically in the form of the
composite cable.
The CDU power connector at each port is a two-pin Molex connector with interlocks to ensure a
good mechanical and electrical connection between the front panel connector and the DC power
connector on the composite cable connector. Note: An external +40-60 VDC power supply
must be used in conjunction with the ERAU.
CDU Front Panel
The figure below provides a detailed view of the CDU front panel, showing the six remote
antenna interface ports. Each of the six ports is identical and provides DC power for the remote
antenna as well as an optical downlink interface and an optical uplink interface with the
Enhanced Remote Antenna Unit.