Locating And Mounting Requirements - ADC Digivance Installation And Operation Manual

ADCP-75-110 • Issue 2B • July 2001
2.2 Location and Mounting Requirements
2.2.1 DHU and DEU Location and Mounting Requirements
The DHU and the DEU may be either rack mounted or wall mounted. Fasteners (both metric and
US standard) are included with each unit for rack mount applications. A pair of reversible mounting
brackets is provided that allows the unit to be mounted in either a 19-inch or 23-inch EIA or WECO
equipment rack. When rack-mounted, the front panel of the unit is flush with the front of the rack.
The cable management tray extends 3.9 inches (99 mm) beyond the front panel. Both the DHU and
DEU occupy 3.5 inches (89 mm) of rack space. Make sure the mechanical loading of the rack will
be even to avoid a hazardous condition such as a severely unbalanced rack. The rack should safely
support the combined weight of all the equipment it holds.
For wall-mount applications of the DHU or DEU, a pair of holes is provided in the cable
management tray that allows the unit to be mounted on any flat vertical surface. The mounting
holes are spaced 11-21/32 inches (296 mm) apart. Orient the DHU/DEU so the front panel
faces up when mounted. Appropriate fasteners for wall mounting must be provided by the
installer. It is recommended that a backer board such as 3/4-inch plywood be installed over the
mounting surface to provide a secure base for attaching the DHU or DEU.
Mount the DHU and DEU in a non-condensing indoor environment such as inside a wiring
closet or within an environmentally controlled cabinet. All controls, connectors, and indicators
are mounted on the front panel. Route all cables to the front panel for connection. Use the
cable retainers provided on the cable management tray to secure the fiber optic, DC power,
and external alarm system cables.
The maximum recommended ambient temperature for the DHU and DEU is 50º C (122º F).
Allow sufficient air circulation or space between each unit when installed in a multi-unit rack
assembly because the operating ambient temperature of the rack environment might be greater
than room ambient. Provide a minimum clearance of 3 inches (76 mm) on both the left and
right sides of the unit for air intake and exhaust. Refer to Figure 2 for the DHU dimensions
and Figure 6 for the DEU dimensions.
2.2.2 DRU Location and Mounting Requirements
The DRU may be wall-mounted or ceiling-mounted. The DRU is equipped with four integral
mounting feet that allow it to be fastened to any flat vertical or horizontal surface. Holes are
provided in the mounting feet for inserting fasteners. Appropriate fasteners for securing the
DRU to the selected mounting surface must be provided by the installer.
Mount the DRU in a non-condensing indoor environment. Route the DC power cable and fiber
optic links to the DRU front panel for connection. Route the antenna coaxial cable to the DRU
rear panel for connection. Provide a minimum of 3 inches (76 mm) of clearance space on all
sides of the DRU (except the bottom) to ensure there is adequate air circulation for cooling. In
addition, at least one surface of the DRU installation area must be open to the interior of the
building. If a portable/flexible antenna will be installed, allow a minimum of 9 inches (229
mm) clearance along the surface with the antenna. Refer to Figure 4 for the DRU dimensions.
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© 2001, ADC Telecommunications, Inc.