Installing Raus In A Multiple Operator System; Configuring The System - ADC InterReach Fusion Installation, Operation And Reference Manual

Fusion Installation Procedures
7.4.3.2
7.4.4
7-36
CONFIDENTIAL

Installing RAUs in a Multiple Operator System

When installing both iDEN and Cellular systems in parallel, either as dual-band or
multiple operator systems, you must take special provision to assure that the individ-
ual RAUs do not interfere with each other.
The 850/1900 MHz and 800/900/1900 MHz RAU's antennas must be separated
by at least 8 meters (26 feet) to assure that the iDEN downlink signals do not
interfere with the Cellular uplink signals.
In addition, ADC recommends antenna separation when collocating "like" RAUs (for
example, an 850/1900 MHz RAU with an 850/1900 MHz RAU) from different sys-
tems (or layers). This ensures that an antenna disconnect alarm is not triggered by
RAU-to-RAU coupling. The physical spacing between antennas reduces the impact
of adjacent RF sources when performing a System Test. This issue is primarily
related to using closely spaced omni-directional antennas in neutral host installations.
The equation below provides the recommended antenna separation spacing (in
meters):
Spacing
meters
TxPwr
dBm
AntGain
dBi
Threshold
dBm
Freq
c
For a typical application, this translates to about 2 meter antenna spacing at 850 MHz
and about 1 meter antenna spacing at 1900 MHz.

Configuring the System

Before the system can operate properly, use AdminBrowser to program the Fusion
Main Hub with the frequency bands that are to be distributed. The Hub must be pro-
grammed with the same frequencies as the RAU used.
NOTE: The frequency bands should automatically be set on power up and
this step should not be required.
Considerations:
• The AdminBrowser software, described in the AdminBrowser User Manual
(PN D-620607-0-20), must be running on a PC/laptop.
InterReach Fusion Installation, Operation, and Reference Manual
§
 ˜ 
¨
TxPwr 2 AntGain Threshold
dBm dBi
©
10
Comp pwr out of RAU;
Antenna gain; 3dBi typ

Max RAU input; 10dBm
Frequency in Hz
˜
8
Speed of light, 3 10
S
˜ ˜ ·
§ ·
4 Freq
 ˜
¨ ¸
¸
20 log
dBm 10 © ¹
c ¹

16dBm typ
m/s
D-620610-0-20 Rev D
20