User's Manual Part 1

ADCP-75-187 • Preliminary Issue 1B • November 2005 • Section 2: DESCRIPTION
Page 2-9
© 2005, ADC Telecommunications, Inc.
3 REMOTE UNIT
The RU is available in either a single-band or a dual-band version. Both versions of the RU
provide the following basic functions:
• Convert the digitized forward path optical signals to digitized RF signals.
• Convert the digitized forward path RF signals to composite RF signals.
• Digitize the reverse path composite RF signals.
• Convert the digitized reverse path RF signals to digitized optical signals.
• Provide an RF interface (antenna port) for the remote antenna(s).
• Provide an optical interface for the HU.
• Transport alarm, control, and monitoring information to the HU via the optical interface.
• Accept AC power input.
• Provide a visual indication of unit status
3.1 Primary Components
Depending on the version, the RU consists of either two or four electronic assemblies mounted
within an environmentally-sealed cast-aluminum enclosure. The Spectrum Transport Module
(STM) provides optical-to-RF and RF-to-optical conversion and digitizing functions; alarm,
control, and monitoring functions; power conversion functions; and RF filtering and interface
functions. The Linear Power Amplifier (LPA) works in conjunction with the STM to amplify
12 NET IN RJ-45 jack (female) Connection point for the CAN interface input
cable.
13 NET OUT RJ-45 jack (female) Connection point for the CAN interface output
cable.
14 ALARM OUTPUT Screw-type terminal
connector (14–26
AWG )
Connection point for an external alarm system.
Includes normally open (NO), normally closed
(NC), and common (COM) wiring connections.
15 REV RF OUT N-type female RF
coaxial connector
Output connection point for the primary reverse
path RF coaxial cable.
16 FWD RF IN N-type female RF
coaxial connector
Input connection point for the forward path RF
coaxial cable.
POWER 24–48 VDC
(Rear side - not shown)
Screw-type terminal
strip
Connection point for the DC power wiring.
(Rear side - not shown)
Chassis ground stud Connection point for a chassis grounding wire.
Note: A more detailed description of LED operation is provided in Section 4.
Table 2-2. Host Unit User Interface, continued
REF
NO
USER INTERFACE
DESIGNATION
DEVICE
FUNCTIONAL
DESCRIPTION