ADC Digivance Installation And Operation Manual page 14

ADCP-75-130 • Issue 3C • August 2006
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Digitizing of the cellular forward path RF signal
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Distribution of the digitized forward path RF signals into six digitized optical signals
•
Conversion of up to six reverse path digitized optical signals to six digitized RF signals
•
Combining of the six digitized RF signals into a single composite digitized RF signal
•
Conversion of the combined digitized RF signal to a composite RF signal
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DC power for powering the DRU's
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Relay contact closures to provide alarm information to an external alarm system
3.5 INCHES
(89 mm)
11.4 INCHES
15.3 INCHES
(389 mm)
2.1.1 Primary Components
The DHU consists of two electronic circuit board assemblies, a power supply assembly, and a
fan assembly that are mounted within a powder-coated sheet metal enclosure. The metal
enclosure provides a mounting point for the electronic assemblies, serves as a heat sink, and
controls RF emissions. Except for the fan units and optical transceivers, the DHU components
are not field replaceable. The DHU is designed for use within a non-condensing indoor
environment such as inside a wiring closet or cabinet. All controls, connectors, and indicators
are mounted on the DHU front panel for convenient access. Cable management functions for
the power and fiber optic cables are provided by a cable management tray that extends
outward from the DHU front panel.
2.1.2 Mounting
The DHU may be used in both rack-mount and wall-mount applications. For rack mount
applications, a pair of reversible mounting brackets is provided that allow the DHU to be
mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. When rack-mounted,
the front panel of the DHU is flush with the front of the rack and the cable management tray
extends 3.9 inches (99 mm) beyond the front panel. For wall-mount applications, a pair of
holes is provided in the cable management tray which allow the DHU to be mounted on any
flat vertical surface. The DHU should be oriented with the front panel facing upward when
wall-mounted. Fasteners are provided for rack-mount applications.
Page 4
© 2006, ADC Telecommunications, Inc.
17.2 INCHES
(290 mm)
(437 mm)
Figure 2. Digital Host Unit
FRONT PANEL
MOUNTING
BRACKET
(BOTH SIDES)
17267-A
CABLE MANAGEMENT
TRAY