ADCP-75-110
•
Issue 2B
•
July 2001
Page 7
©
2001, ADC Telecommunications, Inc.
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
FRONT PANEL
MOUNTING FOOT
(EACH CORNER)
7.0 INCHES
(178 mm)
7.3 INCHES
(185 mm)
2.1 INCHES
(53 mm)
16420-A
Figure 4. Digital Remote Unit
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.
Summary of Contents for Digivance
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