Installation Manual

ADCP-75-112 • Issue 2A • June 2001
Page 3
© 2001, ADC Telecommunications, Inc.
1 DESCRIPTION
This section describes the DRU, the various DRU antennas, and the AC/DC power converter
(optional accessory item).
1.1 Digital Remote Unit
The DRU, shown in Figure 1, serves as the cellular user servicing unit for the Digivance ICS.
The DRU consists of an electronic circuit board assembly that is mounted within a powder-
coated sheet metal enclosure. The electronic circuit board assembly is not user replaceable.
The DRU is designed for use within a non-condensing indoor environment such as inside a
building. All controls, indicators, and connectors (except the antenna connector) are mounted
on the DRU front panel for convenient access.
FRONT PANEL
MOUNTING FOOT 
(EACH CORNER)
7.0 INCHES 
(178 mm)
7.3 INCHES 
(185 mm)
2.1 INCHES 
(53 mm)
16420-A
Figure 1. Digital Remote Unit
The DRU is equipped with four integral mounting feet that allow it to be mounted on any flat
horizontal or vertical surface. A typical location for mounting the DRU would be above
ceiling tiles where the optical fiber and power cables can be concealed or on a wall. Slots are
provided in the mounting feet for securing the DRU to the mounting surface.
The RF signal interface between the DRU and the cellular users is provided through an
external antenna connected to a female SMA connector. The antenna may be ordered
separately from ADC. Several types of antennas with various patterns are available. Non-ADC
antennas may also be used with the DRU to meet various application requirements.
The DRU is equipped with a small form factor LC type optical transceiver that provides a
point for connecting the optical link cables. Depending on the application requirements, the
optical transceiver may be connected to either a DHU or a DEU.