ADCP-75-110
•
Issue 2B
•
July 2001
Page 4
©
2001, ADC Telecommunications, Inc.
•
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
•
DC
power for powering the DRUs
•
Relay
contact closures to provide alarm information to an external alarm system
17.2 INCHES
(437 mm)
3.5 INCHES
(89 mm)
11.4 INCHES
(290 mm)
15.3 INCHES
(389 mm)
FRONT PANEL
CABLE MANAGEMENT
TRAY
MOUNTING
BRACKET
(BOTH SIDES)
16418-A
Figure 2. Digital Host Unit
1.2.1 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, the electronic circuit board assemblies are not
user
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.
1.2.2 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. 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.
Summary of Contents for Digivance
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