User's Manual

ADCP-75-132 • Issue 2C • August 2006

Page 19

3.2 Location and Mounting Requirements

3.2.1 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 and be properly anchored.

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. The DHU/DEU should be oriented 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.

The DHU and DEU should be mounted 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. All cables should be routed to the

front panel for connection. Cable retainers provided on the cable management tray for

securing 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).

Sufficient space for air circulation should be provided 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. A minimum clearance of 3 inches (76 mm) should be

provided 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.

3.2.2 DRU Location and Mounting Requirements

The DRU must be installed in a non-condensing indoor environment and may be wall-mounted

or ceiling-mounted. The DRU may also be installed in spaces used for environmental air such

as the space over a suspended ceiling or beneath a raised floor. However, the DRU is not

intended for installation in marine, industrial, or Intrinsic Safety (IS) environments without an

engineering review of the air quality as well as other constituent gasses and dusts. Indoor air

environments are to have air borne contaminants at or below levels established in Telcordia

Standard, GR-63-CORE, Network Equipment-Building System (NEBS) Requirements:

Physical Protection, Section 4.5 Airborne Contaminants, Table 4-11, Indoor Contaminant

Levels. Contact ADC for application assistance if necessary.

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.