ADC Digivance Installation And Operation Manual page 18

ADCP-75-110 • Issue 2B • July 2001
3.5 INCHES
(89 mm)
15.3 INCHES
(389 mm)
1.4.1 Primary Components
The DEU consists of two electronic circuit board assemblies and a power supply that are
mounted within a powder-coated sheet metal enclosure. The metal enclosure provides a
mounting point for the electronic assemblies and serves as a heat sink. Except for the fan
units, the electronic circuit board assemblies are not user replaceable. The DEU 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 DEU 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 DEU front panel.
1.4.2 Mounting
The DEU 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 DEU to be
mounted in either a 19-inch or 23-inch EIA or WECO equipment rack. When rack-mounted,
the front panel of the DEU 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 DEU to be mounted on any
flat vertical surface. The DEU should be oriented with the front panel facing upward when
wall-mounted. Fasteners are provided for rack-mount applications.
1.4.3 Fault Detection
The DEU is designed to detect internal circuitry faults or loss of system inputs. Various front
panel Light Emitting Diode (LED) indicators turn from green to red or yellow when a fault is
detected or when an optical input is lost. The DEU transports the fault information to the DHU
or supporting DEU over the fiber optic link. A corresponding port LED at the DHU or DEU
turns from green to red when the DEU reports a fault.
Page 10
© 2001, ADC Telecommunications, Inc.
11.4 INCHES
(290 mm)
Figure 6. Digital Expansion Unit
17.2 INCHES
(437 mm)
FRONT PANEL
MOUNTING
BRACKET
(BOTH SIDES)
16422-A
CABLE MANAGEMENT
TRAY