COMBA RXA3748 User manual

RXA3748/RXA3792
RXB3748/RXB3792
QE: 1-0-0
编制： _ _ _
审核： __
会签： _ _
标准化： _
批准： _
京信通信系统（中国）有限公司
CriticalPoint Public Safety BDA
DIGITAL BAND
SELECTIVEREPEATER
USER MANUAL

CriticalPoint
PUBLIC SAFETY BI-
DIRECTIONALAMPLIFIER
USER MANUAL
RXA3748/RXA3792
RXB3748/RXB3792
QE: 1-0-0
Comba Telecom Ltd.

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INSTALLATION GUIDE FOR RX-7W22, II2
The information contained herein is the responsibility of and is approved by the
following, to whom all enquiries should be directed:
This is an unpublished work the copyright in which vests in Comba International
("Comba"). All rights reserved.
The information contained herein is confidential and the property of Comba and is
supplied without liability for errors or omissions. No part may be reproduced,
disclosed or used except as authorized by contract or other written permission. The
copyright and the foregoing restriction on reproduction and use extend to all media
in which the information may be embodied.

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INSTALLATION GUIDE FOR RX-7W22, II2
0.1 CONTENTS
Section Page
1.1 CONTENTS....................................................................................................................................... 4
1.2 INDEX TO FIGURES AND TABLES............................................................................................. 6
1.3 HISTORY........................................................................................................................................... 7
1.4 GLOSSARY OF TERMS................................................................................................................. 8
1.5 SAFETY NOTICES AND ADMONISHMENTS............................................................................. 9
1 GENERAL INFORMATION........................................................................................................... 10
2 EQUIPMENT DESCRIPTION....................................................................................................... 14
2.1 FUNCTIONAL BLOCK DIAGRAM............................................................................................... 14
2.2 EQUIPMENT LAYOUT.................................................................................................................. 15
2.3 EQUIPMENT CONSTITUTION.................................................................................................... 16
3 INSTALLATION .............................................................................................................................. 17
3.1 WARNINGS AND ALERTS........................................................................................................... 17
3.2 SITE PLANNING CONSIDERATIONS ....................................................................................... 18
3.2.1 SITE PLANNING ............................................................................................................................ 18
3.2.2 INSTALLATION CHECKLIST....................................................................................................... 19
3.3 INSTALLATION PROCEDURES................................................................................................. 20
3.3.1 GOODS INWARDS INSPECTION............................................................................................... 20
3.3.2 TOOLS............................................................................................................................................. 20
3.3.3 PREPARATION.............................................................................................................................. 20
3.3.4 WALL MOUNTING......................................................................................................................... 21
3.3.5 DRIP-LOOP..................................................................................................................................... 21
3.4 EQUIPMENT CONNECTORS...................................................................................................... 22
3.4.1 PS BDA CONNECTORS............................................................................................................... 22
3.4.2 PS BDA LED INDICATORS.......................................................................................................... 23
3.4.3 GROUNDING CONNECTION...................................................................................................... 23
3.4.4 RF CABLE CONNECTION ........................................................................................................... 23
3.4.5 ETHERNET CONNECTION......................................................................................................... 23
3.4.6 DRY CONTACT CABLE CONNECTION.................................................................................... 24
4 COMMISSIONING ......................................................................................................................... 25
4.1 PRE-COMMISSIONING TASKS.................................................................................................. 25
4.2 COMMISSIONING PROCEDURE............................................................................................... 26
5 WEB GUI......................................................................................................................................... 28
5.1 WEB GUI CONNECTION ............................................................................................................. 28
5.2 WEB GUI INTRODUCTION.......................................................................................................... 29
5.2.1 [HOME] ............................................................................................................................................ 29
5.2.2 [COMMISSIONING]....................................................................................................................... 31
5.2.3 [MANAGEMENT]............................................................................................................................ 31
5.3 COMMISSIONING PROCEDURE............................................................................................... 38
6 MAINTENANCE.............................................................................................................................. 41
7 APPENDICES................................................................................................................................. 42
7.1 APPENDIX A................................................................................................................................... 42
7.2 APPENDIX B: TOOLS................................................................................................................... 44
7.3 APPENDIX C: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT................ 45

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INSTALLATION GUIDE FOR RX-7W22, II2
7.4 APPENDIX D: TROUBLESHOOTING QUICK GUIDE............................................................. 46
7.5 APPENDIX E: DEVICE REPORT EXAMPLE............................................................................ 49
7.6 APPENDIX F: RMA (RETURN MATERIAL AUTHORIZATION) ............................................. 50

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INSTALLATION GUIDE FOR RX-7W22, II2
1.2 INDEX TO FIGURES AND TABLES
Figure 1: Front, Side and Bottom Views of the PS BDA Enclosure.................................................................. 10
Figure 2: PS BDA Functional Block Diagram.................................................................................................... 14
Figure 3: Layout of the PS BDA........................................................................................................................ 15
Figure 4: Mounting Rack Overview................................................................................................................... 20
Figure 5: PS BDA Wall Mounting ..................................................................................................................... 21
Figure 6: Equipment Connectors...................................................................................................................... 22
Figure 7: Commissioning Procedure ................................................................................................................ 26
Figure 8: Input IP Address................................................................................................................................ 28
Figure 9: Input Domain Name .......................................................................................................................... 28
Figure 10: Input User Name and Password...................................................................................................... 28
Figure 11: Web GUI Main Screen..................................................................................................................... 29
Figure 12: Overview Screen ............................................................................................................................. 29
Figure 13: Device Alarm Screen....................................................................................................................... 30
Figure 14: 800MHz Screen............................................................................................................................... 30
Figure 15: Commissioning Screen.................................................................................................................... 31
Figure 16: Management Screen...................................................................................................................... 31
Figure 17: Management –Device Info.............................................................................................................. 32
Figure 18: Management –Comm. Setting........................................................................................................ 32
Figure 19: Management-Alarm Setting............................................................................................................. 33
Figure 20: Management-Alarm Setting............................................................................................................. 33
Figure 21: Management –Isolation.................................................................................................................. 34
Figure 22: Management –Reset...................................................................................................................... 34
Figure 23: Management –Report..................................................................................................................... 35
Figure 24: Management –Report..................................................................................................................... 35
Figure 25: Management –Log.......................................................................................................................... 36
Figure 26: Management –License................................................................................................................... 36
Figure 27: Management –Security................................................................................................................... 37
Figure 28: Commissioning Procedure –Start................................................................................................... 38
Figure 29: Commissioning Procedure –Site Info. Setting................................................................................ 38
Figure 30: Commissioning Procedure –Isolation Detection............................................................................. 39
Figure 31: Commissioning Procedure –Isolation Detection Confirm ............................................................... 39
Figure 32: Commissioning Procedure –Finish................................................................................................. 40
Figure 33: Alarm list.......................................................................................................................................... 46
Figure 34: Reset PA ......................................................................................................................................... 47
Table 1: Equipment Connectors....................................................................................................................... 22
Table 2: LED Indicators.................................................................................................................................... 23
Table 3: Pin Definition of Dry Contact Cable.................................................................................................... 24
Table 4: Commissioning Task Explanation....................................................................................................... 27

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INSTALLATION GUIDE FOR RX-7W22, II2
1.3 HISTORY
Change No.
ENU
Details Of Change
1
1-0-0
This manual first created and issued in May. 2020.

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INSTALLATION GUIDE FOR RX-7W22, II2
1.4 GLOSSARY OF TERMS
Abbreviation
Definition
ALC
Automatic Level Control
ATT
Attenuator
BTS
Base Transceiver Station
CH
Channel
CSA
Cross Sectional Area
dB
Decibel
dBm
Decibels relative to 1 milliwatt
DL
Downlink
DT
DonorTerminal
DPX
Duplexer
FS
FrequencySelection
Hz
Hertz
ID
Identification
IF
IntermediateFrequency
LNA
Low Noise Amplifier
LOS
Line-of-Sight
MCU
Main Control Unit
MHz
Megahertz
MT
MobileTerminal
MTBF
Mean Time Between Failures
NF
Noise Figure
OMC
Operation & Maintenance Center
OMT
Operation & Maintenance Terminal
PA
Power Amplifier
PLL
Phase Locked Loop
PSU
Power Supply Unit
RF
RadioFrequency
SMA
Sub-Miniature A Connector
UL
Uplink
VAC
Volts Alternating Current
VDC
Volts Direct Current
VSWR
Voltage Standing Wave Ratio

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INSTALLATION GUIDE FOR RX-7W22, II2
1.5 SAFETY NOTICES AND ADMONISHMENTS
This document contains safety notices in accordance with appropriate standards. In the interests of conformity
withthe territory standards for thecountryconcerned,theequivalentterritorialadmonishmentsarealsoshown.
Any installation, adjustment, maintenance and repair of the equipment must only be carried out by trained,
authorized personnel. At all times, personnel must comply with any safety notices and instructions.
Specific hazards are indicated by symbol labels on or near the affected parts of the equipment. The labels
conform to international standards, are triangular in shape, and are colored black on a yellow background. An
informative text label may accompany the symbol label.
Hazardlabelingis supplementedbysafetynotices intheappropriateequipmentmanual.Thesenoticescontain
additional information on the nature of the hazard and may also specify precautions.
Note: The grantee is not responsible for any changes or modifications not expressly approved by the party
responsible for compliance. Such modifications could void the user’s authority to operate the equipment.
For compliance with the general population RF exposure limits, each individual antenna used for this
transmitter must be installed to provide a separation distance greater than 31.2cm or more from all persons
during normal operation and must not be co-located with any other antenna for meeting RF exposure
requirements.
Warning Notices:
These draw the attention of personnel to hazards that may cause death or injury to the operator or others.
Examples of use are cases of high voltage, laser emission, toxic substances, point of high temperature, etc.
WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and
QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express consent of an FCC Licensee to
operate this device. The PS BDA can be configured as Class A ( FCC ID: PX8RXA37) or Class B (FCC
ID:PX8RXB37) Signal Booster. You MUST register Class B signal boosters (as defined in 47 CFR
90.219) online at
www.fcc.gov/signal-boosters/registration. Unauthorized use may result in significant forfeiture
penalties, including penalties in excess of $100,000 for each continuing violation.
Note: The grantee is not responsible for any changes or modifications not expressly approved by the party
responsible for compliance. Such modifications could void the user’s authority to operate the equipment.
Alert:
These draw the attention of personnel to hazards that may cause damage to the equipment. An example of
use is the case of static electricity hazard.
Caution notices may also be used in the handbook to draw attention to matters that do not constitute a risk of
causing damage to the equipment but where there is a possibility of seriously impairing its performance, e.g.
by mishandling or gross maladjustment. Warnings and Cautions within the main text do not incorporate labels
and may be in shortened form.
Disconnection of the 2 RF connectors may cause damage to the equipment when power is on
The application antenna and RF cable are not provided. FCC regulation mandate that the ERP of
type B signal boosters should not exceed 5W, this booster has a maximum programmable
composite output power of 5W(37dBm) for Downlink, 1W(30dBm) for uplink. Therefore, the gain
of the antenna should be of 0dBi or less.

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INSTALLATION GUIDE FOR RX-7W22, II2
WARNING!
Use only authorized and approved antennas, cables and/or coupling devices! The use of unapproved
antennas, cables or coupling devices could cause damage and may be of violation of FCC regulations. The
use of unapproved antennas, cables and/or coupling devices is illegal under FCC regulations and may
subject the user to fine. End of Section

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INSTALLATION GUIDE FOR RX-7W22, II2
1 GENERAL INFORMATION
The RXA3748/RXA3792 (Class A), RXB3748/RXB3792 (Class B) is a new digital dual band public safety
repeater (hereafter referred to as PS BDA) designed to protect the lives of first responders and building
occupants. Through the use of digital filtering technology, the RX-7W22 helps eliminate adjacent channel
interference to allow band selectivity and support 700MHz and 800MHz rebanding. Up to two non-contiguous
frequency bands can be simultaneously supported in each of the 700MHz and 800MHz Public Safety
frequencies via a web-based GUI, which provides versatility and total control to the user.
Main Features
 PS 700MHz and 800MHz.
 Class A BDA, 32 channels per band or Class B BDA, 3 sub-bands.
 Channel selective or Band selective, software programmable.
 Autodiagnostic.
 Uplink squelch, per channel for Class A only.
 User adjustable gain control (AGC), UL and DL independent per channel.
 700MHz and 800MHz band compatible, software adjustable.
 Built in isolation testing (mandatory prior to commissioning the PS BDA).
 Easy commission and setup via Web-based GUI, and SNMP supported
 Weatherproof enclosure, IP65/NEMA4.
 Fully compliant with the 2016 NFPA 72 Code.
 Competitive size and weight.
 Alarming output to supervised circuits for: antenna failure, signal booster failure, and etc.
The following figure shows the enclosure of the PS BDA.
Figure 1: Front, Side and Bottom Views of the PS BDA Enclosure

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INSTALLATION GUIDE FOR RX-7W22, II2
Specifications-Class A (FCC ID:PX8RXA37)
Electrical
700MHz
800MHz
Frequency Range, Uplink
MHz
799-805
806-817
Frequency Range, Downlink
MHz
769-775
851-862
ChannelBandwidth
KHz
12.5/25/100
12.5/25/100
Number of Channels
32
32
Total Output Power, Uplink
dBm
30
Total Output Power, Downlink
dBm
37
37
Maximum System Gain
dB
100
100
Gain Adjustment Range (1dB step)
dB
0-30
0-30
Pass Band Ripple, p-p
dB
 5
 5
Uplink Noise Figure
dB
 5
 5
System Group Delay
Bandwidth:
12.5KHz
sec
 35
 35
Bandwidth:25KHz
 25
 35
Out-of-Band
Suppression
Bandwidth:
12.5KHz
dBc
≥60 @ filter center +
75KHz
≥60 @ filter center +
75KHz
Bandwidth:25KHz
≥60 @ filter center +
75KHz
≥60 @ filter center +
75KHz
Bandwidth:100KHz
≥60 @ filter center +
200KHz
≥60 @ filter center +
200KHz
Intermodulation
dBm
 -13
 -13
Spurious
9kHz to 1GHz
dBm
FCCCompliance
FCCCompliance
1GHz to 12.75GHz
dBm
Maximum RF Input Power without Damage
dBm
-10
-10
Maximum RF Input Power without Overdrive
dBm
-20
-20
Input VSWR
 1.5
 1.5
Impedance

50
50
Mechanical
Dimensions, H x W x D
in(mm)
22.4 x 15.4 x 9.0 (570 x 390 x 228)
Weight (without bracket)
lb(kg)
66.2 (30)
Power Supply
VAC
100-240/47-63Hz
VDC
-40 ~ -58
PowerConsumption
Single band
W
120
Dual band
W
200
EnclosureCooling
Convection
RF Connectors
N-Female
Test Port
SMA, -27dB
Maximum Input for Dry Contact Port
24VDC, 1A / 110VAC, 0.5A
OperatingTemperature
oF(oC)
-27 to +140 (-33 to +60)
OperatingHumidity
 95%
EnvironmentalClass
NEMA 4
Note: Typical specifications at room temperature,

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INSTALLATION GUIDE FOR RX-7W22, II2
Specifications-Class B (FCC ID: PX8RXB37)
Electrical
700MHz
800MHz
Frequency Range, Uplink
MHz
788-798,799-805
806-816
Frequency Range, Downlink
MHz
758-768,769-775
851-861
OperatingBandwidth
MHz
0.2-10
0.2-10
Number of Sub Bands
3
3
Total Output Power, Uplink
dBm
30
Total Output Power, Downlink
dBm
37
37
Maximum System Gain
dB
100
100
Gain Adjustment Range (1dB step)
dB
0-30
0-30
Pass Band Ripple, p-p
dB
 5
 5
Uplink Noise Figure
dB
 5
 5
System Group Delay
sec
 6.5
 6.5
Out-of-BandSuppression
dBc
≥45 @ filter edge +
0.6MHz
≥60 @ filter edge +
1MHz
≥45 @ filter edge +
0.6MHz
≥60 @ filter edge +
1MHz
Intermodulation
dBm
 -13
 -13
Spurious
9kHz to 1GHz
dBm
FCCCompliance
FCCCompliance
1GHz to 12.75GHz
dBm
Maximum RF Input Power without Damage
dBm
-10
-10
Maximum RF Input Power without Overdrive
dBm
-20
-20
Input VSWR
 1.5
 1.5
Impedance

50
50
Mechanical
Dimensions, H x W x D
in(m
m)
22.4 x 15.4 x 9.0 (570 x 390 x 228)
Weight (without bracket)
lb(kg)
66.2 (30)
Power Supply
VAC
100-240/47-63Hz
VDC
-40 ~ -58
PowerConsumption
Single band
W
120
Dual band
W
200
EnclosureCooling
Convection
RF Connectors
N-Female
Test Port
SMA, -27dB
Maximum Input for Dry Contact Port
24VDC, 1A / 110VAC, 0.5A
OperatingTemperature
oF
(oC)
-27 to +140 (-33 to +55)
OperatingHumidity
 95%
EnvironmentalClass
NEMA 4
Note: Typical specifications at room temperature,

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INSTALLATION GUIDE FOR RX-7W22, II2
The rated output power of this equipment is for single carrier operation. For situation when multiple carrier
signals are present, the rating would have to be reduced by 3.5dB, especially where the output signal is re-
radiated and can cause interference to adjacent band users. This power reduction is to be by means of input
power or gain reduction and not by an attenuator at the output of the device.

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INSTALLATION GUIDE FOR RX-7W22, II2
MCU
Master Digital Board
30.72MHz
12.8MHz
PLL1
RX_1
2
TX_2
30d
B
1
ADC
AMP
UL_PA
AMP
UL_LNA
AMP
DAC
800UL
20dB
FPGA
TX_1
RX_2
AMP
DAC
AMP
AMP
DL_PA
DL_LNA
ADC
RX
RTC
RX
700&800UL
AD9370_1
32.768MHz
AD9370_0
ORX1
FB
30.72MHz
12.8MHz
FB
FS
-30 dB
MT
TX
800DL
800DL
30.72MHz
12.8MHz
PLL3
Slave Digital Board
TX
700DL
700DL
TX
RX_
1
30d
B
TX_2
ADC
DAC
700UL
20dB
FPGA
数字
ATT
TX_
1
RX_2
AMP
DAC
ADC
AMP
AMP
DL_LNA
DL_PA
30dB
700DL
模拟
ATT
10dB
30.72MHz 12.8MHz
2 EQUIPMENT DESCRIPTION
2.1 FUNCTIONAL BLOCK DIAGRAM
AD9370_1 25MHz
MCU
RTC
32.768MHz AD9370_0
PLL4
Figure 2: PS BDA Functional Block Diagram
In the downlink path, the BTS signals are received by the donor antenna of the repeater. After the duplexer,
the signals are sent to the LNA module for pre-amplification and to the digital RF integrated module for digital
filtering and frequency conversion. Then the DL signals will be sent to the downlink PA to amplify power, and
filter via the duplexer. After amplification, the signals are transmitted at the MT port to the service antenna.
In the uplink path, the mobile signals are received by the service antenna. After the MT port integrated duplexer,
the signals are sent to the LNA, integrated module for digital filtering, then to the PA for power amplification
and to the duplexer. After that, the uplink signals are sent to the donor antenna for transmission back to the
BTS.
-
30dB

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2.2 EQUIPMENTLAYOUT
Shown below is the internal layout of the PS BDA.
Figure 3: Layout of the PS BDA
Power Supply Unit
800MHz Integrative Module
Master Digital Board
Duplexer
Duplexer
Slave Digital Board
700MHz Integrative Module

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INSTALLATION GUIDE FOR RX-7W22, II2
2.3 EQUIPMENTCONSTITUTION
The typical PS BDA unit consists of the following components:
Master Digital Board and Slave Digital Board: The MCU is used to monitor and control the operation of the
repeater. It also provides the communication interface for remote control and status indication. LED indicators
provide the operation status of the MCU.
Duplexer: The DPX is located near the MT and DT terminals and permits the uplink and downlink signals to
share a common antenna.
700MHz /800MHz Digital Integrated Module and Power Amplifier: Consists of the Power Conversion
module, RF module, digital process module and monitoring modules. The Power Conversion module converts
+28V DC voltage into +9VJK and +9VRF. +9VJK, +9VRF are supplied to the monitoring unit, and the RF unit
in the integrated module separately. The RF module amplifies and converts the RF signal to IF signal. The
Digital process module converts the IF signal into baseband signal via AD conversion and extraction, and
filtering. After that, the IF signal will be amplified and converted to anRF signal by theRF module for RF filtering
and amplification. The Monitoring module monitors and controls the system parameters and is the interface for
both remote monitoring and local commissioning.
Power Supply Unit (PSU): The PSU converts the input voltage into a stable DC supply to provide power for
the internal functional modules.

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INSTALLATION GUIDE FOR RX-7W22, II2
3 INSTALLATION
3.1 WARNINGS AND ALERTS
Radio Frequency Energies
There may be situations, particularly for workplace environments near high-powered RF sources, where
recommended limits for safe exposure of human beings to RF energy could be exceeded. In such cases,
restrictive measures or actions may be necessary to ensure the safe use of RF energy.
High Voltage
The equipment has been designed and constructed to prevent, as far as reasonably practicable danger. Any
work activity on or near equipment involving installation, operation or maintenance must be, as far as
reasonable, free from danger.
Where there is a risk of damage to electrical systems involving adverse weather, extreme temperatures, wet,
corrosive or dirty conditions, flammable or explosive atmospheres, the system must be suitably installed to
preventdanger.
ProtectiveEarthing
Equipment provided for the purpose of protecting individuals from electrical risk must be suitable for the
purpose and properly maintained and used.
HandlingPrecautions
This covers a range of activities including lifting, lowering, pushing, pulling, carrying, moving, holding or
restraining an object, animal or person from the equipment. It also covers activities that require the use of force
or effort, such as pulling a lever, or operating power tools.
Where some of the abovementioned activities are required, the equipment must be handled with care to avoid
beingdamaged.
Electrostatic Discharge (ESD)
Observe standard precautions for handling ESD-sensitive devices. Assume that all solid-state electronic
devices are ESD-sensitive. Ensure the use of a grounded wrist strap or equivalent while working with ESD-
sensitive devices. Transport, store, and handle ESD-sensitive devices in static-safe environments.

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INSTALLATION GUIDE FOR RX-7W22, II2
3.2 SITEPLANNING CONSIDERATIONS
3.2.1 SITE PLANNING
SiteConsiderations
Outdoor equipment is designed to be waterproof, rainproof, and with snow protection. Temporary protection
should be taken when the equipment enclosure is opened for installation or maintenance in an outdoor
environment. The equipment must not be opened for installation or maintenance in bad weather (e.g. gale,
storm rainfall, extreme temperatures and high humidity)
InstallationLocation
Mounting surface shall be capable of supporting the weight of the equipment.
In order to avoid electromagnetic interference, a proper mounting location must be selected to minimize
interference from electromagnetic sources such as large electrical equipment.
Environmental
Humidity has an adverse effect on the reliability of the equipment. It is recommended to install the equipment
in locations having stable temperature and unrestricted air-flow.
Theinstallationlocationfor the productshouldbewellventilated.The equipment has been designedtooperate
at the temperature range and humidity level as stated in the product specifications in the datasheet.
Direct sun light exposure to the equipment should be avoided. Provide additional shelter if necessary.
Power Supply
The power supply unit (PSU) provides power to all modules within the equipment. Depending on the product
variant, it is recommended that the PSU be operated on a dedicated circuit breaker or fused circuit.
GroundingRequirement
Verify that the equipment has been well grounded. This includes antennas and all cables connected to the
system. Ensure lightning protection for the antennas is properly grounded.
Cable Routing
Depending on equipment configuration, a variety of types of cables are required. Where applicable, ensure
cables are properly routed and secured so that they are not damaged.
Manual Handling
During transportation and installation, take necessary handling precautions toavoid potential physical injury to
the installation personnel and the equipment.

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INSTALLATION GUIDE FOR RX-7W22, II2
3.2.2 INSTALLATION CHECKLIST
 Working space available for installation and maintenance for each mounting arrangement. Ensure
unrestrictedairflow.
 Ensure earth ground point is within reach of the ground wire.
 Ensure a power source is within reach of the power cord and the power source has sufficient capacity.
 Where appropriate, ensure unused RF connectors are terminated.
 Do not locate the equipment near large transformers or motors that may cause electromagnetic
interference.
 Reduce signal loss in feeder cable by minimizing the length and number of RF connections.
 Ensure VSWR of antennas system < 1.5:1.
 Ensure equipment will be operated within the stated environment (see datasheet)
 Observe handling of all cables to prevent damage.
 Donor antenna should have a narrow beamwidth and positioned in line-of-sight (LOS) to the donor BTS
site so that the donor signal level is maximized. This allows the use of minimum gain to achieve the
maximum DL output power. The UL gain is typically set lower than or equal to the DL gain to minimize
noise interference to the donor BTS
 Service antennas should be selected based on the type of service area, e.g., indoor antenna for indoor
application, and panel antenna for outdoor application.