User Manual

ADCP-75-136 • Issue 1 • November 2002
Page 9
© 2002, ADC Telecommunications, Inc.
connector. Power to the DRU may be supplied by the DHU, DEU, or by a 120 Vac to 48 Vdc
power converter (available separately as an accessory item) plugged into a properly grounded
120 Vac outlet. The ac/dc converter is a UL Listed stand-alone Limited Power Supply (LPS)
unit with a rated output of 48 Vdc at 1.2 Amps. When powered by the DHU or DEU, a
category 3 or 5 twisted-pair cable terminated with RJ-45 connectors is required.
2.2.7 Cooling
The DRU is cooled by natural convection air flow. The DRU mounting feet are designed to provide
clearance under the unit so that air can enter the DRU enclosure from the bottom and exit through
the top. A minimum clearance of 3 inches (76 mm) must be provided 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.
2.2.8 User Interface
The DRU user interface consists of the connectors and the LED that are provided on the DRU
front and rear panels. The DRU user interface points are described in Table 2 and indicated in
Figure 5.
Table 2. Digital Remote Unit User Interface
REF
No.
USER INTERFACE
DESIGNATION DEVICE
FUNCTIONAL
DESCRIPTION
1 STATUS Multi-colored LED
(Red/Green/Yellow)
Indicates if the status of the DRU is
normal or faulty or if the forward path
optical input is normal or lost. (see Note)
2 48 VDC RJ-45 jack (female) Used for connecting a DC power cable.
3 FIBER
TX RX
LC-type optical
transceiver
Used for connecting the forward path and
reverse path optical fibers.
4 – SMA-type coaxial
connector (female)
Used for connecting the antenna coaxial
cable lead.
Note: A more detailed description of LED operation is provided in Section 5.
17269-A
REAR VIEWFRONT VIEW
(4) ANTENNA CONNECTOR
(1) STATUS LED
(2) 48 VDC POWER
CONNECTOR
(3) FIBER LINK
OPTICAL ADAPTERS
TX-LEFT - RX-RIGHT
Figure 5. Digital Remote Unit User Interface