Digital Remote Unit Description - ADC Digivance Installation And Operation Manual

1.3 Digital Remote Unit Description

The DRU, shown in Figure 4, serves as the cellular user servicing unit for the Digivance ICS.
The DRU provides the following basic functions:
•
RF interface to the cellular users via an external antenna
•
Optical interface to the DHU or DEU
•
Conversion of the forward path digitized optical signal to a digitized RF signal
•
Conversion of the digitized forward path RF signal to the original cellular RF signal
•
Digitizing of the cellular reverse path RF signal
•
Conversion of the digitized reverse path RF signal to a digital optical signal output
•
Transports alarm status via optical link
1.3.1 Primary components
The DRU consists of an electronic circuit board assembly that is mounted within a powder-
coated sheet metal enclosure. The metal enclosure provides a mounting point for the electronic
assembly, serves as a heat sink, and controls RF emissions. 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, connectors, and indicators (except
the SMA antenna connector) are mounted on the DRU front panel for convenient access.
1.3.2 Mounting
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.
2.1 INCHES
(53 mm)
7.3 INCHES
(185 mm)
Figure 4. Digital Remote Unit
ADCP-75-110 • Issue 2B • July 2001
FRONT PANEL
MOUNTING FOOT
(EACH CORNER)
7.0 INCHES
(178 mm)
© 2001, ADC Telecommunications, Inc.
16420-A
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