User's Manual

Product Overview
Page 4 InterReach Spectrum Remote Access Unit Installation Guide
©
2011 ADC Telecommunications, Inc ADCP-77-168 • Issue 2 • 07/2011
PRODUCT OVERVIEW
InterReach Spectrum supports up to eight frequency bands in a single system.
Each antenna location supports those bands in modular, group pairings. Each
location includes a Main Remote Access Unit (MRAU), which can power up to three
additional Secondary Remote Access Units (SRAUs). An MRAU supports two
frequency bands, and each SRAU can support up to two frequency bands, for a
total of up to eight frequency bands. MRAUs and SRAUs are grouped logically,
based on common service provider groupings and include, as an example:
• 850/1900
• 700/700 MIMO
• 800/900 SMR
• 1900/AWS.
To add more frequency bands, you connect an SRAU to the existing MRAU.
Figure 1 illustrates how RF and IF signals are sent between Spectrum units and
modules.
Figure 1. REV and FWD Signals for the RAU
NOTE: This book refers to the Omni Antenna (4214-M727), which is the antenna that ADC
recommends. Other antennas may be used. For further information on the Omni Antenna,
see
“Appendix C: Omni Antenna” on page 21.
Omni Antenna
Host
Power Supply
IF Expansion Unit
DART Remote Unit
Expansion Module Group
Secondary Remote Access Unit
Main Remote Access Unit
IF
R
F
RF
IF
Reverse (REV)
Forward (FWD)
Key to Signal Path
RF
IF