COMBA RA-8000 User manual

INSTALLATION GUIDE FOR RA-8000
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RA-8000
800MHZ FIBER OPTIC REPEATER
The information contained herein is the
responsibility of and is approved by the
following, to whom all enquiries should
be directed in the first instance:
Comba Telecom Ltd.
This is an unpublished work the copyright in which vests in Comba International ("Comba").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.
USER MANUAL

INSTALLATION GUIDE FOR RA-8000
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0.2 CONTENTS
Section Page
0.2 CONTENTS ........................................................................................................................... 2
0.3 INDEX TO FIGURES AND TABLES ..................................................................................... 4
0.4 HISTORY............................................................................................................................... 6
0.5 GLOSSARY OF TERMS ....................................................................................................... 7
0.6 SAFETY NOTICES AND ADMONISHMENTS...................................................................... 8
1GENERAL INFORMATION ................................................................................................... 9
2EQUIPMENT DESCRIPTION.............................................................................................. 11
2.1 SYSTEM DIAGRAM ............................................................................................................ 11
2.2 TYPICAL APPLICATION..................................................................................................... 12
2.3 EQUIPMENT LAYOUT........................................................................................................ 13
2.4 EQUIPMENT CONSTITUTION ........................................................................................... 15
2.5 KIT OF PARTS ....................................................................................................................16
3INSTALLATION ...................................................................................................................17
3.1 WARNINGS AND ALERTS ................................................................................................. 17
3.2 SITE PLANNING CONSIDERATIONS................................................................................ 18
3.2.1 REPEATER 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 RACK MOUNTING OF MOU .............................................................................................. 21
3.3.5 MOUNTING ARRANGEMENT ............................................................................................ 22
3.3.6 RRU LIFTING LUG.............................................................................................................. 23
3.3.7 WALL MOUNTING OF RRU MOUNTING RACK ............................................................... 23
3.3.8 POLE MOUNTING OF RRU MOUNTING RACK................................................................ 24
3.3.9 ATTACHING RRU ONTO MOUNTING RACK.................................................................... 25
3.3.10 DRIP-LOOP......................................................................................................................... 25
3.4 EQUIPMENT CONNECTORS ............................................................................................ 26
3.4.1 MOU CONNECTORS.......................................................................................................... 26
3.4.2 RRU CONNECTORS .......................................................................................................... 31
3.5 EQUIPMENT CONNECTION .............................................................................................. 32
3.5.1 GROUNDING CONNECTION............................................................................................. 32
3.5.2 SERVICE VOLTAGE CONNECTION ................................................................................. 32
3.5.3 LI-ION BATTERY CONNECTION ....................................................................................... 33
3.5.4 RF CONNECTION............................................................................................................... 33
3.5.5 OPTICAL CONNECTION .................................................................................................... 34
3.5.6 EXTERNAL ALARM CONNECTION................................................................................... 34
3.5.7 BTS ALARM CONNECTION ............................................................................................... 35
3.5.8 MOU SHELF INTERNAL CONNECTION ........................................................................... 36
3.5.9 INTEGRATED MODEM CONNECTON .............................................................................. 37
3.5.10 CONNECT TO PC............................................................................................................... 39
4COMMISSIONING............................................................................................................... 40
4.1 PRE-COMMISSIONING TASKS ......................................................................................... 40
4.2 LED INDICATORS .............................................................................................................. 40
4.2.1 MCU LED INDICATORS ..................................................................................................... 40
4.2.2 RRU LED INDICATORS...................................................................................................... 40
4.3 OMT..................................................................................................................................... 41
4.3.1 LOCAL AND REMOTE CONNECTIONS TO OMT............................................................. 41
4.3.2 LOCAL CONNECTION TO OMT ........................................................................................ 41

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4.3.3 REMOTE CONNECTION TO OMT..................................................................................... 42
4.3.4 OMT CONFIGURATION ..................................................................................................... 43
4.3.5 SYSTEM INFO .................................................................................................................... 43
4.3.6 RF PARAMETER ................................................................................................................ 44
4.3.7 SWITCH............................................................................................................................... 44
4.3.8 ATT ...................................................................................................................................... 44
4.3.9 ALARM THRESHOLD ......................................................................................................... 45
4.3.10 ALARM INFORMATION ...................................................................................................... 45
4.3.11 PROPERTIES INFORMATION ........................................................................................... 47
4.3.12 EQUIPMENT ID...................................................................................................................47
4.3.13 COMM. CONFIG ................................................................................................................. 48
4.3.14 DATA MAINTENANCE........................................................................................................ 50
4.4 NON-VOLATILE MEMORY ................................................................................................. 50
4.5 COMMISSIONING PROCEDURES .................................................................................... 51
5MAINTENANCE ..................................................................................................................52
5.1 O-RING FITTING DETAILS................................................................................................. 52
6APPENDICES......................................................................................................................53
6.1 APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE ................................. 53
6.2 APPENDIX B: SERVICING POLICY AND RETURN OF EQUIPMENT ............................. 54
6.3 APPENDIX C: RMA (RETURN MATERIAL AUTHORIZATION) FORM ............................. 55

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0.3 INDEX TO FIGURES AND TABLES
Figure 1: View of MOU Fully Equipped Shelf .......................................................................................10
Figure 2: Front, Side and Bottom Views of RRU Enclosure.................................................................10
Figure 3: MOU System Diagram...........................................................................................................11
Figure 4: RRU System Diagram ...........................................................................................................11
Figure 5: Application of one MOU with one RRU through Single Channel FOU with Internal WDM...12
Figure 6: Application of one MOU with two RRUs through Dual Channel FOU with Internal WDM ....12
Figure 7: Fully Equipped Front View of MOU .......................................................................................13
Figure 8: RRU Equipment Layout.........................................................................................................14
Figure 9: Rack Mounting of 19” Shelf ...................................................................................................21
Figure 10: RRU Mounting Rack Dimension..........................................................................................22
Figure 11: RRU Enclosure Lifting Lug Attachment Details...................................................................23
Figure 12: RRU Mounting Rack Wall Mounting....................................................................................23
Figure 13: Pole Mounting of RRU Mounting Rack................................................................................24
Figure 14: Attaching the RRU onto the Mounting Rack........................................................................25
Figure 15: MOU Back Panel View ........................................................................................................30
Figure 16: RRU Connectors..................................................................................................................31
Figure 17: Pins Allocation for “EXT_ALM” Port ....................................................................................34
Figure 18: Pin Allocation for “BTS_ALM” Port......................................................................................35
Figure 19: RF Connection between RFU and Single Output in FOU1.................................................36
Figure 20: RF Connection between RFU and Two Outputs in FOU1 ..................................................36
Figure 21: RF Connection between RFU and Two Outputs in FOU1, One Output in FOU2...............37
Figure 22: RF Connection between RFU and Two Outputs in FOU1, Two Outputs in FOU2 .............37
Figure 23: Wireless Modem..................................................................................................................37
Figure 24: Diagram of wireline modem.................................................................................................38
Figure 25: Location of RRU LED Indicators..........................................................................................41
Figure 26: Connection Type..................................................................................................................42
Figure 27: Serial Port Configuration......................................................................................................42
Figure 28: Remote Connection.............................................................................................................42
Figure 29: OMT Main Window..............................................................................................................43
Figure 30: System Information..............................................................................................................43
Figure 31: RRU Switch .........................................................................................................................44
Figure 32: MOU ATT.............................................................................................................................44
Figure 33: MOU Alarm Threshold.........................................................................................................45
Figure 34: RRU Alarm Threshold..........................................................................................................45
Figure 35: MOU Master Alarm..............................................................................................................46
Figure 36: MOU Channel Alarm............................................................................................................46
Figure 37: RRU Master Alarm...............................................................................................................46
Figure 38: RRU External Alarm ............................................................................................................47
Figure 39: MOU Equipment ID..............................................................................................................48
Figure 40: ROU Equipment ID..............................................................................................................48
Figure 41: MOU Comm.Config .............................................................................................................49
Figure 42: “O” ring fitting details............................................................................................................52
Table 1: MOU Shelf Equipping Rule.....................................................................................................13
Table 2: RA-8000 Regular KOP............................................................................................................16
Table 3: MOU KOP...............................................................................................................................16
Table 4: RRU KOP................................................................................................................................16
Table 5: Repeater Installation Checklist...............................................................................................19
Table 6: PSU SIU Description...............................................................................................................27
Table 7: MCU SIU Description..............................................................................................................28
Table 8: Single Channel FOU SIU Description.....................................................................................29
Table 9: Dual Channel FOU SIU Description .......................................................................................29
Table 10: MOU Back Panel Connectors...............................................................................................30
Table 11: RRU connectors....................................................................................................................31
Table 12: Pin Definition of “EXT_ALM” Port .........................................................................................34
Table 13: Voltage Applied to EXT_ Alarm1~4......................................................................................34
Table 14: Pin definition of the BTS_ALM port.......................................................................................35

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Table 15: MCU LED Indicators.............................................................................................................40
Table 16: RRU LED Indicators..............................................................................................................40
Table 17: Equipment ID ........................................................................................................................47
Table 18: Comm.Config........................................................................................................................49

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0.4 HISTORY
Change No. ENU Details Of Change
1 1-0-0 This document first created in July 2010.

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0.5 GLOSSARY OF TERMS
ALC Automatic Level Control
ATT Attenuation
BS Base Station
BTS Base Transceiver Station
dB Decibel
dBm Decibels relative to 1 milliwatt
DL Downlink
DPX Duplexer
DT Donor Terminal
EEPROM Electrically Erasable Programmable Read Only Memory
E/O,O/E Electrical/Optical, Optical/Electrical
Hz Hertz
ID Identification
LNA Low Noise Amplifier
MCU Main Control Unit
MHz Megahertz
MT Mobile Terminal
MTBF Mean Time Between Failures
NC Normally Closed
NF Noise Figure
NO Normally Open
OMC Operation & Maintenance Center
OMT Operation & Maintenance Terminal
OP Optical Fiber
PA Power Amplifier
PLL Phase Locked Loop
PSU Power Supply Unit
RF Radio Frequency
RX Receive
SMA Sub-Miniature “A” Connector
TETRA Terrestrial Trunked Radio
TX/RX Transmit/Receive
UL Uplink
VAC Volts Alternating Current
VSWR Voltage Standing Wave Ratio
WCDMA Wideband Code Division Multiple Access
WDM Wavelength Division Multiplexer

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0.6 SAFETY NOTICES AND ADMONISHMENTS
This document contains safety notices in accordance with appropriate standards. In the interests of
conformity with the territory standards for the country concerned, the equivalent territorial
admonishments are also shown.
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.
Hazard labeling is supplemented by safety notices in the appropriate equipment manual. These
notices contain additional information on the nature of the hazard and may also specify precautions.
Warning:
These draw the attention of personnel to hazards which 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.
Alert:
These draw the attention of personnel to hazards which 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.
End of section

INSTALLATION GUIDE FOR RA-8000
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1 GENERAL INFORMATION
RA-8000 800MHz Fiber Optic Repeater (hereinafter called system) is designed for the flexible
enhancement of BTS signal, the elimination of blind area for cell coverage and the optimization for
network coverage. It improves UL/DL signals for better voice quality after amplification, thus extends
the BTS signals coverage.
This system consists of Direct Coupling Master Optical Unit (MOU) RA-8000-D, Remote Radio Unit
(RRU) RA-8000-R.
This system can achieve the complete backup for the entire communication link through hot stand-by
RF modules. With lower cost but desirable performance, this system is suitable for digital trunking
network applications as traffic, government, subways, etc.
Remote configuration and surveillance is possible through Comba’s OMT/OMC.
Characteristics of the RA-8000 system are as follows:
yOptimization for 800MHz band.
yHigh dependable performance with the competent solution of hot stand-by RF modules.
yHigh output power with high linearity power amplifier, which ensures the signal source is of good
quality.
yIntegrated alarm interface for remote system monitoring.
yLocal Operation and Maintenance Terminal (OMT): Operating status and parameters can be set
or monitored locally by OMT PC. The point-to-point setting and inquiry between MOU and RRU
is realizable through the integrated FSK modem, which makes it convenient for on-site
configuration.
yOperation Maintenance Center (OMC): System working parameters and communication
configuration can be set or inquired remotely through the integrated wireline modem. If alarm is
generated, the equipment will dial up to OMC automatically, which will send short messages to
the handset of maintenance staff.
yBack-up Li-ion battery keeps the alarm unit running for up to two hours after power cut.
yThe RRU enclosure is designed for all sheltered installation - waterproof, damp-proof and omni-
sealed (IP65).

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The figures below show the equipment enclosure layout of RA-8000 MOU and RRU:
177
482
360
Figure 1: View of MOU Fully Equipped Shelf
RXTX
EXT_ALM RS- 232
OP/DL_UL
200-240V~ 50Hz/60Hz
615
210
350
Figure 2: Front, Side and Bottom Views of RRU Enclosure

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2 EQUIPMENT DESCRIPTION
2.1 SYSTEM DIAGRAM
Figure 3: MOU System Diagram
Figure 4: RRU System Diagram
As shown in the above figures, the DL signals from the BTS are coupled directly and converted into
optical signals after amplification in the MOU. Then, the optical signals are transmitted to the RRU via
optical fiber. The Optical TX/RX Module of RRU converts the DL optical signals into RF signals. After
amplification, the signals are transmitted at the MT port to the service antenna.
On the UL, the signals transmitted by the mobile are converted into optical signals, and then via the
UL optical fiber. The signals are transmitted to MOU, which then converts the optical signals back to
RF signals. After amplification, the signals are transmitted back to the BTS.
Communication over optical fiber allows the RRU to be managed with the same fiber connection to
the MOU. This is achieved by using the integrated Frequency Shift Keying (FSK) modem.

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2.2 TYPICAL APPLICATION
The standard configuration is one MOU connects with one RRU through Single Channel FOU.
Figure 5: Application of one MOU with one RRU through Single Channel FOU with Internal WDM
A fully equipped Master Optical Unit can accommodate two Double Channel FOUs. A fully equipped
MOU can host two RRUs.
Figure 6: Application of one MOU with two RRUs through Dual Channel FOU with Internal WDM

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2.3 EQUIPMENT LAYOUT
The RA-8000 MOU (RA-8000-M) is constructed into a 19” 4U shelf, with connectors located on the
front and back panels. The RRU (RA-8000-R) is designed for all cables entries from the bottom of the
enclosure.
The MOU consists of a shelf that accommodates up to seven slide-in modules. Slots are numbered
‘1’ to ‘7’ from left to right. The following slide-in modules are accommodated with the MOU:
yFiber Optical Unit (FOU)
yRadio Frequency Unit (RFU)
yMain Control Unit (MCU)
yPower Supply Unit (PSU)
All the slide-in modules except the MCU are designed with a backup module being exist concurrently.
This ensures the dependable operation of the entire system due to fault of any module.
For illustration purposes, shown below are two variants of Fiber Optical Unit (FOU) for standard and
extension configuration. From left to right, they are: Single Channel FOU, Dual Channel FOU. Where
applicable, blanking off plates and SMA-SMA jumpers are supplied
OP/UL-DL
POWER
PSU
RFU MCU
FSK
ALARM
PUN
BTS-ALM
RS-232
OP/UL-DL
FOU
50/60Hz
220~240V
Modem
RFU
TX/RX
Downlink Uplink Downlink
Uplink
Figure 7: Fully Equipped Front View of MOU
Depending on customer’s network requirement of whether it is Single Channel FOU or Double
Channel FOU been integrated, two kinds of equipment layout of MOU shelf exist. Shown below is the
equipping rule of the MOU shelf.
Solution and SIU
equipping
Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot
6
Slot
7
4x RRU Solution 2 2
3x RRU Solution 2 1
3x RRU Solution 1 2
2x RRU Solution 2 Blank
2x RRU Solution Blank 2
1x RRU Solution 1 Blank
1x RRU Solution Blank 1
Blank Blank
RFU
MCU PSU
Table 1: MOU Shelf Equipping Rule
•‘1’ denotes Single Channel FOU (with or without Integrated WDM capability)
•‘2’ denotes Dual Channel FOU (either with or without Integrated WDM capability). By design,
only slot ‘1’ and ‘2’ can accommodate Dual Channel FOU

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•“Blank” denotes position for “Blanking off plate” this slot may be interchanged with Single
Channel FOU
•RFU by design is equipped in Slot 5, MCU by design is equipped in Slot 6, PSU by design is
equipped in slot 7
The internal layout for the RRU is shown below:
V20-C V20-C
POWER
MODEL:
S/N NO.:
28V+
IN OK
BAT2+
GND
L
E
N
BAT2
AC
Output
28V-
9V+
9V-
JK+
JK-
BAT2-
OUT OK
RF OUT
RF IN
PA
Pre-amplifier
MCU
Distribution Board
PSU
Optical TX/RX
Module
VSWR Module
LNA
DPX
Li-ion Battery
Door Open Switch
Surge Arrestor
UL Filter
DL Filter
Figure 8: RRU Equipment Layout

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2.4 EQUIPMENT CONSTITUTION
This RA-8000 system consists of MOU and RRU that consist of the modules described below:
MOU Modules
•Radio Frequency Unit (RFU): RF connection with the FOU(s) is from the rear panel, whereas BTS
RF connection(s) are connected to the front.
•Power Supply Unit (PSU): Converts the input voltage into a stable DC to provide power for other
modules and to charge the internal Li-ion battery. The integrated Li-ion battery provides power to
the Main Control Unit to send alarm signals in the event of power failure.
•Main Control Unit (MCU): Controls and monitors the operation parameters of the MOU and
provides communication interface for local monitoring and remote monitoring.
•Fiber Optical Unit (FOU): Interface between MOU and RRUs. Performs conversion between RF
and optical signals. It consists of an FSK modem for communication between the MOU and RRU
over optical fiber.
RRU Modules
•Main Control Unit (MCU): Controls and monitors the operation parameters of the RRU and
provides communication interface for local monitoring.
•Optical TX/RX Module: Performs conversion between optical and RF signals and the gain setting
of fiber link. Optical RX Module converts the received optical signals into RF signals and the
Optical TX Module converts the received RF signals into optical signals to be transmitted back to
the MOU.
•Duplexer (DPX): TX/RX the uplink and downlink signals.
•Pre-amplifier Module: Pre-amplifies the RF signals from/to the Optical TX/RX Module.
•Power Supply Unit (PSU): Converts the input AC voltage into a stable DC to provide power for
other modules and to charge the internal Li-ion battery. Two switches exist on the PSU when
viewing from the front of the PSU, “Left” switch controls power to the RRU, and the “Right” switch
control the circuit between the Li-ion battery pack and the MCU.
•Surge Arrestor: Provides protection to the PSU.
•Low Noise Amplifier (LNA): with ATT function, used to pre-amplify the signal in and Uplink to
ensure low noise.
•Li-ion Battery: Supplies power to alarm unit for up to two hours in the event of AC/DC power
failure.
•UL/DL filter: The use of filter can select and purify the desired signals.
•Door Open Switch: Used to monitor the door status. If the door is open, a door open alarm will be
generated.
•VSWR Module: Used to test the VSWR of UL output and input to MT. A VSWR alarm will be
generated, if the tested VSWR is over the threshold.
•Distribution Board: The distribution board serves as a distributor for power and internal
communication within the equipment. It provides connectivity to function modules, MCU and
RS232 port for local control.

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2.5 KIT OF PARTS
For this system, the following are shipped:
Table 2: RA-8000 Regular KOP
Product Identifier Description Quantity
250V/3.2A Delay Fuse Equipment replacement fuse 2
Power supply cable n/a 1
R-9122C/R-9122AC Commissioning Cable 1
XD-GSM-900/1800V-3 Antenna for modem 1
Table 3: MOU KOP
Product Identifier Description Quantity
T3-099901-5201 Mounting Rack 1
T3-000201-5114 Lifting Lug 1
T3-099901-5202 Clamp 2
00-100DJT5104 Optical Connector Cover 1
00-100DJT-5105 Optical Connector Screw Cap 1
00-100DJT-5106 Rubber Loop 1
n/a Enclosure Key for door-lock 2
M10xM110 Masonry bolts 4
M12x160 Carriage Bolt set 4
M6 x12 Hex Socket Bolt 2
M8 x20 Hex Socket Bolt 6
M12 Nut 8
M6 Spring Washer 2
5.5mm Allen Key 1
X14J5-DB9K Commissioning cable for local
commissioning 1
Delay Fuse Equipment replacement fuse 2
Table 4: RRU KOP
End of Section
Product Identifier Description Quantity
RA-8000 QI This equipment manual 1
OMT V4.0 or above OMT software on CD-Rom 1
n/a Testing Report 1

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3 INSTALLATION
3.1 WARNINGS AND ALERTS
Laser
Laser light can cause damage to eyes. Laser light is not visible. Viewing it directly does not cause
pain. The iris of the eye will not close when viewing a bright light. Consequently, serious damage to
the retina of the eye is possible. NEVER LOOK INTO THE END OF A FIBER WHICH MAY HAVE A
LASER COUPLED TO IT.
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 reasonably, 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 prevent danger.
Protective Earthing
Equipment provided for the purpose of protecting individuals from electrical risk must be suitable for
the purpose and properly maintained and used.
Handling Precautions
This covers a range of activities including lifting, lowering, pushing, pulling, carrying, moving, holding
or restraining an object, animal or person. It also covers activities that require the use of force or effort,
such as pulling a lever, or operating power tools.
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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3.2 SITE PLANNING CONSIDERATIONS
Site Considerations
The MOU can be located indoors to facilitate coupling of BTS signals and power supply connections.
The recommended input range of BTS signal is -15~5 dBm. Hence, an appropriate coupler must be
used according to input power of the repeater.
The RRU 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)
The site considerations for RRUs are listed below:
•The distance between the service antenna of RRU and coverage area should satisfy line of sight
requirements for maximum coverage area.
•The maximum fiber length is 20km, with a maximum optical path loss of 10dB.
•For outdoor coverage applications, UL diversity is an option.
•The system delay of the optical system must be taken into consideration when there are
neighboring BTS sites overlapping in coverage.
Installation Location
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.
The installation location for the product should be well ventilated. The equipment has been designed
to operate 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.
Powering
The power supply unit (PSU) provides power to all modules within the equipment. Depending on the
product variant, it is recommended that the PSU operates on a dedicated circuit breaker or fused
circuit.
Grounding Requirement
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 to avoid potential physical
injury to the installation personnel and the equipment.

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3.2.1 REPEATER INSTALLATION CHECKLIST
Installation Location Requirement Considerations
Working Space available
Ample space on 19” rack and mounting pole/wall
surface (recommended to reserve 800mm x 800mm
x 800mm) for unrestricted airflow and cable routing.
AC Mains
Power cord length is about 3m. Use a
dedicated AC breaker or fuse circuit, and
with good access to an earthing point.
There are a number of power supply options
for MOU:
-48VDC
Power cord length is 3m with CSA of
2.5mm2
Range: -36VDC to -72VDC.
The DC operating current should be
>10A.
RF ports terminated Terminate all unused RF ports with the appropriate
terminating load
Earth point Earthing point/Safety ground within 2m / 6.5 ft.
EMC and interference
Do not locate near large transformers or motors that
may cause electromagnetic interference. Install
blanking off plates on the MOU.
Maintain distance from equipment to DT, MT
antennas Reduce of signal loss in feeder cable
VSWR check For the antennas, VSWR value to be < 1.5
Suitable operating environment
-20°to +40°C for MOU and -33°to +55°C for RRU.
Maximum 85 % (MOU), 95 %( RRU) relative
humidity.
Locate BTS signal derived at the coupler.
Typical RF input signal from BTS is from -10dBm to
0dBm, select the correct coupler at the BTS site and
to tune the ATT for optimal RF performance.
Locate the mobile antenna according to the
coverage requirement. Satisfying the requirement for Line of sight.
Confirm optical wavelength For fiber sharing or single fiber working
Confirm optical fiber availability FC-FC connector < 20km between FOU and RRU.
With fiber path loss observed.
Optical fiber handling Maintain the minimum bending radius (> 30 mm)
Confirm RF cable availability For connection to BTS and to remote antenna.
Table 5: Repeater Installation Checklist

INSTALLATION GUIDE FOR RA-8000
RA-8000 QI Copyright - refer to title page Page 20
ENU Status : 1-0-0
3.3 INSTALLATION PROCEDURES
3.3.1 GOODS INWARDS INSPECTION
This system was factory tested, inspected, packed, and delivered to the carrier with utmost care. Do
not accept shipment from carrier which shows damage or shortage until the carrier's agent endorses
a statement of the irregularity on the face of the carrier's receipt. Without documentary evidence, a
claim cannot be processed.
Open and check each package against the packing list. For any shortage, contact Comba Telecom
Systems. Do not remove items from packing materials until installation.
3.3.2 TOOLS
See appendix for a full list of tools required for installation and maintenance.
3.3.3 PREPARATION
•Mounting surface capable of support equipment’s weight: MOU at 12kg with RRU at 28kg
•Power outlet within 2m
•Terminate unused antenna/RF cable with 50 ohm terminator
•Protect unused optical interface with protective cap
•Earthing point/Safety ground within 2m
Antenna:
•Antenna installation is covered by their respective manuals. Take normal precautions when
preparing and handling feeder cables to ensure they are not damaged.
Optical Fiber:
•Fiber optic cables require proper handling. Do not stretch, puncture, or crush the fiber cable(s)
with staples, heavy equipment, doors, etc.
•Always maintain the minimum bending radius specified by the cable manufacturer. The minimum
bend radius is usually 10 times as the cable's outer diameter. In the case of single optical fiber
that is not in a cable, the minimum bending radius to be observed is 3cm.