User Manual

Users Guide - Andrew InCell™ Fiber Optic Distributed Antenna System
2-7
ERAU Optical Interface
The ERAU optical interface is through a set of fiber optic connectors located on the front panel
of the ERAU. The optical interface provides the uplink and downlink signal paths between the
ERAU and the CDU. Each optical port consists of a pair of fiber optic links. The downlink path
carries the optical signal from the CDU 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 ERAU 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.
PWR
TX RX
PWR
AUX Power Input
For Local Power
Remote DC Power
Fiber Optic Connectors
(Type SC/APC) To/From CDU
+
-
LINK
Figure 2-8. Enhanced Remote Antenna Unit
ERAU DC Power Input Interface
The ERAU is designed to operate using +40 VDC to +60 VDC and can be powered remotely
from or locally using a wall power supply. The primary DC power input connector on the
ERAU accepts remote DC power through a composite fiber optic and copper cable. To use the
primary DC power ports to provide power to an ERAU, two copper wires must be used, typically
in the form of the composite cable.
The +VDC and GND signals are provided through a composite cable to the power connectors
located on the bottom panel of the ERAU. The primary ERAU DC power connector 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.