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USER MANUAL
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This is an unpublished work the copyright in which vests in Comba International ("Comba").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 authorised 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.
RA-7100
DUAL-BAND FIBER OPTIC REPEATER
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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
1 GENERAL INFORMATION ................................................................................................... 9
2 EQUIPMENT DESCRIPTION.............................................................................................. 12
2.1 SYSTEM DIAGRAM ............................................................................................................ 12
2.2 TYPICAL APPLICATION.....................................................................................................13
2.2.1 SINGLE FIBER CONFIGURATION ....................................................................................13
2.3 EQUIPMENT LAYOUT........................................................................................................14
2.4 EQUIPMENT CONSTITUTION ........................................................................................... 17
2.5 KIT OF PARTS ....................................................................................................................18
3 INSTALLATION ................................................................................................................... 19
3.1 WARNINGS AND ALERTS ................................................................................................. 19
3.2 SITE PLANNING CONSIDERATIONS................................................................................ 20
3.2.1 REPEATER INSTALLATION CHECKLIST ......................................................................... 21
3.3 INSTALLATION PROCEDURES ........................................................................................22
3.3.1 GOODS INWARDS INSPECTION ...................................................................................... 22
3.3.2 TOOLS.................................................................................................................................22
3.3.3 PREPARATION...................................................................................................................22
3.3.4 CABINET MOUNTING OF MU............................................................................................ 23
3.3.5 RU MOUNTING RACK DIMENSION .................................................................................. 24
3.3.6 WALL MOUNTING OF RU.................................................................................................. 25
3.3.7 POLE MOUNTING OF RU .................................................................................................. 27
3.3.8 DRIP-LOOP.........................................................................................................................28
3.4 EQUIPMENT CONNECTORS ............................................................................................28
3.4.1 MU CONNECTORS ............................................................................................................28
3.4.2 RU CONNECTORS............................................................................................................. 29
3.4.3 COMBINER UNIT CONNECTORS ..................................................................................... 30
3.5 EQUIPMENT CONNECTION..............................................................................................31
3.5.1 GROUNDING CONNECTION.............................................................................................31
3.5.2 LI-ION BATTERY CONNECTION ....................................................................................... 31
3.5.3 RF CONNECTION............................................................................................................... 31
3.5.4 CABLE CONNECTION........................................................................................................ 32
3.5.5 EXTERNAL ALARM CONNECTION...................................................................................33
3.5.6 BTS ALARM CONNECTION............................................................................................... 33
3.5.7 CONNECT TO PC...............................................................................................................34
4 COMMISSIONING............................................................................................................... 35
4.1 PRE-COMMISSIONING TASKS ......................................................................................... 35
4.2 LED INDICATORS ..............................................................................................................36
4.2.1 MU LED INDICATORS........................................................................................................ 36
4.2.2 RU LED INDICATORS ........................................................................................................ 36
4.3 OMT.....................................................................................................................................37
4.3.1 LOCAL AND REMOTE CONNECTIONS TO OMT.............................................................37
4.3.2 LOCAL CONNECTION TO OMT ........................................................................................37
4.3.3 REMOTE CONNECTION TO OMT.....................................................................................38
4.3.4 OMT CONFIGURATION .....................................................................................................38
4.3.5 SYSTEM INFO ....................................................................................................................39
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4.3.6
RF PARAMETER ................................................................................................................39
4.3.7 SWITCH...............................................................................................................................39
4.3.8 ATT ...................................................................................................................................... 40
4.3.9 ALARM THRESHOLD ......................................................................................................... 40
4.3.10 ALARM INFORMATION ...................................................................................................... 41
4.3.11 PROPERTIES INFORMATION ........................................................................................... 42
4.3.12 EQUIPMENT ID................................................................................................................... 43
4.3.13 COMM. CONFIG .................................................................................................................44
4.3.14 DATA MAINTENANCE........................................................................................................45
4.4 NON-VOLATILE MEMORY.................................................................................................45
5 OPERATION........................................................................................................................46
6 MAINTENANCE ..................................................................................................................47
7 APPENDICES......................................................................................................................48
7.1 APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE ................................. 48
7.2 APPENDIX B: SERVICING POLICY AND RETURN OF EQUIPMENT .............................49
7.3 APPENDIX C: RMA (RETURN MATERIAL AUTHORIZATION) FORM.............................50
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0.3 INDEX TO FIGURES AND TABLES
Figure 1: View of MU Fully Equipped Shelf ...................................................................................................10
Figure 2: Front, Side and Bottom Views of RU Enclosure...........................................................................11
Figure 3: View of Combiner Unit Fully Equipped Shelf ................................................................................11
Figure 4: MU System Diagram ........................................................................................................................12
Figure 5: Application of One MU with One RU through One Optical Module with WDM........................13
Figure 6: Application of One MU with Four RUs through Two Optical Modules with WDM ...................13
Figure 7: MU Equipment Layout- System (One for Four) with LAN Port ..................................................14
Figure 8: MU Equipment Layout- System (One for Four) with Wireless Modem .....................................14
Figure 9: RU Equipment Layout (5W+5W) ....................................................................................................15
Figure 10: RU Equipment Layout (20W+20W)..............................................................................................15
Figure 11: Combiner Unit Equipment Layout ................................................................................................16
Figure 12: Cabinet Mounting of 19” Shelf ......................................................................................................23
Figure 13: RU Mounting Rack Dimension (5W+5W)....................................................................................24
Figure 14: RU Mounting Rack Dimension (20W+20W) ...............................................................................24
Figure 15: RU Wall Mounting (5W+5W).........................................................................................................25
Figure 16: RU Wall Mounting (20W+20W) ....................................................................................................26
Figure 17: Pole Mounting of RU (5W+5W) ....................................................................................................27
Figure 18: Pole Mounting of RU (20W+20W)................................................................................................27
Figure 19: MU Front Panel Connectors..........................................................................................................28
Figure 20: MU Back Panel Connectors ..........................................................................................................28
Figure 21: RU Connectors................................................................................................................................29
Figure 22: Combiner Unit Connectors ............................................................................................................30
Figure 23: Cable Connection ...........................................................................................................................32
Figure 24: Pins Allocation for “EXT_ALM” Port.............................................................................................33
Figure 25: Pins Allocation for “BTS_ALM” Port.............................................................................................33
Figure 26: Connection Type.............................................................................................................................37
Figure 27: Serial Port Configuration................................................................................................................37
Figure 28: Remote Connection........................................................................................................................38
Figure 29: OMT Main Window .........................................................................................................................38
Figure 30: System Information.........................................................................................................................39
Figure 31: Switch between MU and RU ......................................................................................................... 39
Figure 32: RU Switch ........................................................................................................................................40
Figure 33: MU ATT ............................................................................................................................................40
Figure 34: RU ATT.............................................................................................................................................40
Figure 35: MU Alarm Threshold ......................................................................................................................41
Figure 36: RU Alarm Threshold.......................................................................................................................41
Figure 37: MU Master Alarm ............................................................................................................................41
Figure 38: MU Channel Alarm .........................................................................................................................42
Figure 39: RU Master Alarm ............................................................................................................................42
Figure 40: RU External Alarm ..........................................................................................................................42
Figure 41: MU Equipment ID............................................................................................................................43
Figure 42: RU Equipment ID ............................................................................................................................44
Figure 43: MU Comm.Config ...........................................................................................................................44
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Table 1: MU Constitution .................................................................................................................................. 17
Table 2: RU Constitution...................................................................................................................................17
Table 3: MU KOP...............................................................................................................................................18
Table 4: Combiner Unit KOP............................................................................................................................18
Table 5: RU KOP (5W+5W) ............................................................................................................................. 18
Table 6: RU KOP (20W+20W).........................................................................................................................18
Table 7: MU Front Panel Connections ...........................................................................................................28
Table 8: MU Back Panel Connections............................................................................................................28
Table 9: RU Connections .................................................................................................................................29
Table 10: Combiner Unit Connections............................................................................................................30
Table 11: Pin Definition of “EXT_ALM” Port .................................................................................................. 33
Table 12: MU LED Indicators...........................................................................................................................36
Table 13: RU LED Indicators ...........................................................................................................................36
Table 14: Equipment ID .................................................................................................................................... 43
Table 15: Comm.Config....................................................................................................................................45
Table 16: Alarms Diagnosis .............................................................................................................................46
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0.4 HISTORY
Change No. ENU Details Of Change
1 1-0-0 This user manual first created on 21 April 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
POI Point of Interconnects
PSU Power Supply Unit
RF Radio Frequency
RX Receive
SMA Sub-Miniature “A” Connector
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 coloured 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 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.
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.
End of Section
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1 GENERAL INFORMATION
The RA-7100 Dual-Band Fiber Optic Repeater (hereinafter called “RA-7100”) is designed for 850MHz
and 1900MHz networks. It provides flexible and scalable solution of multi-operator coverage
extension applications, such as citywide enhancement, highway, canyons, campus, underground
tunnels, airports, convention centres, etc.
The low signal transmission loss of optical fiber is applicable for long distance transmission. RA-7100
can support the optical transmission of up to 6.5dB signal transmission loss. There is no isolation
problem between TX and RX antennas, which means customer can select the antenna flexibly
according to the real situation, such as directional or omni-directional antenna.
Main feature:
• High output power with high linearity, which supports multiple carrier operation and ensures the
signal source is of good quality.
• Optical fiber transmission with long distance transition at the most path loss of 6.5dB.
• Automatic Gain Control (AGC
1
): In latest RA repeater system, in optical TX/RX module has been
implemented with the AGC function.
• Local Operation and Maintenance Terminal (OMT): operating status and parameters can be set
or monitored by OMT PC locally. And the point-to-point setting and inquiry between MU and RU is
realizable through the integrated wireless modem, which makes it convenient for on-site
configuration.
• Operation Maintenance Center (OMC): system working parameters and communication
configuration can be set or inquired remotely through the integrated wireless modem. If alarm is
generated, the equipment will dial up to OMC automatically in the mode of SMS or datalink.
• Build-in Li-ion battery ensures that alarm information can automatically report to OMC in case of
equipment power failure.
• RU is designed for all-weather outdoor operation - waterproof, damp-proof and omni-sealed.
1
It will adjust the optical receiver gain automatically. The AGC function will help to stable the transmission path
gain and simplifies the link budget calculation and commissioning. This is obvious convenience comparing to the
last platform, which requires gain adjustment manually.
* The new function needn’t to be set or triggered manually by OMT and will be activated automatically whenever
the repeater is on.
* Optical gain adjustable range: 0~6.5dB (equivalents to 0~13dB RF gain)
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The figures below show the equipment enclosure layout of RA-7100 MU, RU and combiner unit:
44
4
8
2
3
6
0
MU with Wireless Modem
44
3
6
0
4
8
2
MU with LAN Port
Figure 1: View of MU Fully Equipped Shelf
MT
FAN
POWER
RS-232
EXT_ALM
228
490
370
5W+5W
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EXT_ALM
RS-232
MT
FAN
POWER
OP/UL DL
240
718
420
20W+20W
Figure 2: Front, Side and Bottom Views of RU Enclosure
44
3
3
0
4
8
2
Figure 3: View of Combiner Unit Fully Equipped Shelf
End of Section
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2 EQUIPMENT DESCRIPTION
2.1 SYSTEM DIAGRAM
Optical Fiber
MU
Optical Fiber Fed Application
Distributed
Antenna
System
1900MHz BTS
850MHz BTS
Downlink Coaxial Cable
Optical Fiber
Distributed
Antenna
System
Distributed
Antenna
System
Distributed
Antenna
System
RU RU RU RU
Uplink Coaxial Cable
Figure 4: MU System Diagram
As shown in the above figures, the separate or combined signals as 850MHz and 1900MHz from the
BTSs are received and converted into optical signals after amplification in the MU.Then the optical
signals are transmitted to the RU via optical fiber. The Optical TX/RX Module of RU 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 MU, which then converts the optical signals back to RF
signals. After amplification, the signals are transmitted back to the BTS.
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2.2 TYPICAL APPLICATION
2.2.1 SINGLE FIBER CONFIGURATION
For equipments with WDM Unit, the single fiber configuration is applicable. Through using WDM
technique, one fiber is shared between optical signals.
Refer to the following two applications of single fiber configuration:
2.2.1.1 Typical Application of Single Fiber Configuration
Shown below is a typical application showing the ability to interwork RA-7100.
Tx/Rx
Tx/Rx
Coupler
BTS
MT
ANT
MU
OP UL_DL
OP UL_DL
1310nm/1550nm
WDM
RU
WDM
WDMWDM
Figure 5: Application of One MU with One RU through One Optical Module with WDM
2.2.1.2 Extension Application of Single Fiber Configuration
A fully equipped MU can host up to four RU (s) through optical module. This can be achieved by
accommodating two Optical Modules with WDM. Refer to the figure below:
Coupler
Figure 6: Application of One MU with Four RUs through Two Optical Modules with WDM
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2.3 EQUIPMENT LAYOUT
The MU is constructed into a 19” shelf. It is connected via the connectors located on the front and
back panel. The RU is designed for all cables entries from the bottom of the enclosure.
The internal layout for the MU is shown below:
Optical TX/RX Module
ALC
APC
OP IN/OUT1 OP IN/OUT2
RF OUTRF IN
Li-ion Battery
MCU
Distribution Board
MODEL:
S/N NO.:
9V-
9V+
JK-
OUT OK
BAT2-
IN OK
BAT2+
JK+
GND
LNE
Optical TX/RX Module
PSU
RF IN RF OUT
OP IN/OUT2OP IN/OUT1
APC
ALC
LAN Ethernet Port
Combine Unit
Figure 7: MU Equipment Layout- System (One for Four) with LAN Port
RF IN RF OUT
OP IN/OUT2OP IN/OUT1
APC
ALC
RF IN RF OUT
OP IN/OUT2OP IN/OUT1
APC
ALC
PSU
MCU
Distribution Board
Combine Unit
Optical TX/RX Module
Li-ion Battery
MODEM
ENL
MODEL:
S/N NO.:
Optical TX/RX Module
9
51
6
9516
6159
Figure 8: MU Equipment Layout- System (One for Four) with Wireless Modem
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The internal layout for the RU is shown below:
C
o
m
b
i
n
e
r
S
u
r
g
e
A
r
r
e
s
t
o
r
R
F
M
o
d
u
l
e
O
p
t
i
c
a
l
T
X
/
R
X
M
o
d
u
l
e
M
C
U
Door Open Switch
Li-ion Battery
+
2
B
A
T
O
U
T
O
K
I
N
O
K
G
N
D
+
V
9
+
V
2
8
-
V
2
8
+
V
2
8
-
V
2
8
-
V
9
+
J
K
-
J
K
-
2
B
A
T
L
E
N
P
S
U
O
P
I
N
/
O
U
T
R
F
I
N
R
F
O
U
T
1
9
0
0
M
H
z
P
A
8
5
0
M
H
z
P
A
Figure 9: RU Equipment Layout (5W+5W)
Combiner
Li-ion Battery
Surge
Arrestor
PSU
MCU
Optical TX/RX
Module
RF Module
UL_IN1
UL_IN2
UL_IN3
DL_OUT1
DL_OUT2
DL_OUT3
28V-
28V-
28V+
28V+
BAT2+
OUT OK
IN OK
GND
9V+
28V+
L
E
N
28V-
9V-
JK+
JK-
BAT2-
1900MHz PA
850MHz PA
Figure 10: RU Equipment Layout (20W+20W)
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The internal layout for Combiner Unit is shown below:
Passive Module
Figure 11: Combiner Unit Equipment Layout
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2.4 EREQUIPMENT CONSTITUTION
This optical repeater consists of MU and RU that consists of the modules described below:
The MU consists of:
Identifier Functional Description
Power Spliter
Supports RF Module, splits DL signal and
combines UL Signal.
Optical TX/RX Module
Completes optical signal and RF signal
conversion.
Main Control Unit (MCU)
Is used to control and monitor the operation
parameters of the MU and provides
telecommunication interface for local monitoring.
Distribution Board
Connects with modules and MCU; local
commissioning via RS232.
Power Supply Unit (PSU)
Converts the input voltage into stable DC to
supply power for other modules and to charge
the internal Li-ion battery.
Li-ion Battery Will supply power to MCU after power failure.
Table 1: MU Constitution
The RU consists of:
Identifier Functional Description
Power Supply Unit (PSU)
Converts the input voltage into stable DC to
supply power for other modules and to charge
the internal Li-ion battery.
Optical TX/RX Module
Completes optical signal and RF signal
conversion.
RF Module Pre-amplifies the UL/DL signals.
PA Module Amplifies the signal of 850MHzand 1900MHz.
Combiner(passive) Combines the signal of 850MHz and 1900MHz.
MCU
Is used to control and monitor the operation
parameters of the RU and provides
telecommunication interface for local monitoring.
Li-ion Battery Will supply power to MCU after power failure.
Table 2: RU Constitution
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2.5 KIT OF PARTS
For this system, the following are shipped:
Product Identifier Description Quantity
Fuse N/A 2
Modem Antenna (optional) shipped with equipment within wireless modem 1
Local Commissioning Cable R-9122C 1
OMT V4.0 OMT software on CD-Rom 1
Table 3: MU KOP
Product Identifier Description Quantity
RF Jumper SMA-M jumper 2
Table 4: Combiner Unit KOP
Product Identifier Description Quantity
Allen Key 5.5mm 1
CPC X14J7P 1
CPC to Local Commissioning Cable X14J5-DB9K 1
Fuse N/A 2
key N/A 2
Masonry Bolt M10x110 4
Power Supply Cable N/A 1
T Shaped Pentagon Key Wrench 5mm 1
U Bolt M10x85x110 2
Table 5: RU KOP (5W+5W)
Product Identifier Description Quantity
CPC to Local Commissioning Cable X14J5-DB9K 1
Clamp TPA901-5204 2
Clevis and Split Pin TPA901-5202 2
Hex Bolt M8x20 4
Hex Nut M12 8
key N/A 2
Low Square Neck Bolt M12x160 4
Masonry Bolt M10x110 4
Mounting Rack TPA901-5203 1
Plain Washer Φ8 4
Power Supply Cable N/A 2
Spring Washer Φ8 4
Table 6: RU KOP (20W+20W)
End of Section
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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 MU can be located indoors to facilitate coupling of BTS signals and power supply connections.
The ALC range of received BTS signal is -10~10 dBm. Hence, an appropriate coupler must be used
according to the BTS output power.
The site consideration for RU is listed below:
• The distance between the service antenna of RU and coverage area should satisfy line of sight
requirements for maximum coverage area.
• The maximum fiber length is 13km, with a maximum path loss of 6.5dB.
• 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 MU should be well ventilated. It is recommended that the distance
between the enclosure and the wall (or any other equipment) should be at least 80cm. The equipment
has been designed to operate at the temperature range and humidity level as stated in the product
specifications that of temperature ranges from -20~40
o
C and the relative humidity is at most 85%.
Direct day light to the RU should be avoided. If the direct day light temperature exceeds 40
o
C, a
shelter should be provided for it.
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 AC 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 connected to the MU and RU:
coaxial cables, optical fibers, power cable, communication cable, and commissioning cable. Where
applicable, ensure cables are properly routed and secured so that they are not damaged.
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Manual Handling
During transportation and installation, take necessary handling precautions to avoid potential physical
injury to the installation personnel and the equipment.
3.2.1 REPEATER INSTALLATION CHECKLIST
z Working space available for installation and maintenance for each mounting arrangement. Ensure
unrestricted airflow.
z Ensure earthing point is within reach of the ground wire.
z Ensure a power source is within reach of the power cord and the power source has sufficient
capacity.
z Where appropriate, ensure unused RF connectors are terminated.
z Where appropriate, ensure unused optical fiber connectors are protected.
z Do not locate the equipment near large transformers or motors that may cause electromagnetic
interference.
z Reduce signal loss in feeder cable by minimizing the length and number of RF connections.
z Ensure the equipment will be operated within the stated environment (refer to datasheet).
z Where needed, couple BTS RF signal with a coupler to prevent damaging the equipment.
z Where appropriate, confirm available of suitably terminated grade of RF and optical fiber.
z Observe handling of all cables to prevent damage.
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3.3 INSTALLATION PROCEDURES
3.3.1 GOODS INWARDS INSPECTION
RA-7100 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 A for a full list of tools required for installation and maintenance.
3.3.3 PREPARATION
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.
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3.3.4 CABINET MOUNTING OF MU
Depending on the installation, should 2-post open-rack are to be used, the mid-mounting brackets are
to be used. For rack or cabinet mounting, the mid-mounting brackets are to be removed from the 4U
shelf. Cage nut and screws are not supplied. Unless being recommended by rack manufacturer, M5
cage nut / bolt are to be used.
Combiner Uint
Combiner Unit
19" Shelf
MOU
Figure 12: Cabinet Mounting of 19” Shelf
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3.3.5 RU MOUNTING RACK DIMENSION
The mounting arrangement of the RU is used for mounting the RU to a wall. The figures below show
the location of the holes for the mounting tabs.
For Wall Mounting
For Pole Mounting
402
200
85
8- 13
Figure 13: RU Mounting Rack Dimension (5W+5W)
4- 12
2-13
176
125
238
Figure 14: RU Mounting Rack Dimension (20W+20W)
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3.3.6 WALL MOUNTING OF RU
Hereinafter are the mounting steps for wall mounting:
z Drill holes on the wall for masonry bolts according to the dimension of the upper/lower mounting
tabs indicated above.
z Insert the masonry bolts (M10x110) to the wall.
z Hook the enclosure onto the masonry bolts, and then lower the whole enclosure to make sure
that the bolts are fastened into the narrow slots of the mounting tabs.
z Tighten nuts to secure the hex socket bolts and enclosure onto the wall.
Plain
Washer
Spring
Washer
Masonry Bolt
Spring Washer
Mounting
Rack
Hex Socket
Bolt M8x20
Plain Washer
Nut M10
Figure 15: RU Wall Mounting (5W+5W)
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z Drill holes on the wall for masonry bolts according to the dimension of the upper/lower mounting
tabs indicated in Figure below.
z Insert the masonry bolts to the wall, and secure the mounting rack on the wall with four M10
masonry bolt nuts.
z Hook the enclosure onto the mounting rack, and then secure all six hex socket bolts on both
side of the enclosure.
Enclosure
M8x20 Hex
Socket Bolt
Mounting Rack
Masonry Bolt
M10x110
Figure 16: RU Wall Mounting (20W+20W)
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3.3.7 POLE MOUNTING OF RU
z Secure the Mounting rack onto the pole using U bolt.
z Hook the enclosure up onto the mounting rack and align the hole positions to that of the
mounting rack, then installed the rack bolts.
z Use spanner to tighten hex socket bolts (M8 x 20) to mounting rack to complete the installation.
Hex Socket Bolt M8x20
U Bolt
Spring Washer
Plain Washer
Plain Washer
Spring Washer
Nut
M10
Mounting Rack
Pole
Rack Bolt
Figure 17: Pole Mounting of RU (5W+5W)
z The equipment can be mounted on poles of about 60~75mm in diameter.
z Secure the mounting rack onto the pole using M8x20mm bolts and clamps using carriage bolts
through the square holes.
z Tighten and lock M12 nuts together onto the carriage bolts.
z Hook the enclosure onto the mounting rack, and then secure all hex socket bolts on both side of
the enclosure.
Mounting Rack
Pole
M8x20 Bolts
Enclosure
Figure 18: Pole Mounting of RU (20W+20W)
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3.3.8 DRIP-LOOP
Comba recommends that every horizontal cable entry to the equipment forms a 'U' before it’s entry to
the equipment. Any accumulated water on the cable will drip down at the bottom of the loop and will
not climb up to the equipment.
3.4 EQUIPMENT CONNECTORS
The MU is connected via the connectors located on the front and back panel. The RU is designed for
all cables entries from the bottom of the enclosure. The figures below present the connectors of MU
and RU.
3.4.1 MU CONNECTORS
Connectors on the MU are identified as below:
LAN
BATTERY
RS-232
MOD
BTS
EXT
POWER
ALMRUN
OP4OP3OP2OP1
Equipment with LAN port
BATTERY
RS-232
MOD
BTS
EXT
POWER
ALMRUNOP4OP3OP2OP1
Equipment with wireless modem
Figure 19: MU Front Panel Connectors
Identifier Functional Description
EXT For extension, DB15 connector.
Battery ON/OFF switch of Li-ion battery.
BTS Up-report to BTS, DB9 connector.
LAN Connects with OMC
Power Power supply switch
RS-232 Local commissioning cable, connect with PC to realize local
commissioning, DB9 connector.
Table 7: MU Front Panel Connections
TX
OP1OP2OP4 OP3
RX
FUSE
POWER
Figure 20: MU Back Panel Connectors
Identifier Functional Description
TX SMA connector.
RX SMA connector.
OP1-OP4 Uplink/downlink optical interface
FUSE Protect the equipment in case of power failure
Power2 A power supply cable for power supply
Table 8: MU Back Panel Connections
2
The voltage identification is a variant due to electricity system diversity of global regions. The power cable grand
might be identified for AC 220V, AC 110V, AC 220V/110V, DC -48V, or DC +24V respectively. Please refer to
specific or contact local sales if any doubt.
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3.4.2 RU CONNECTORS
Connectors on the RU are identified below:
EXT_ALM
RS-232
POWER
FAN
MT
5W+5W
EXT_ALM
RS-232
MT
FAN
POWER
OP/UL DL
20W+20W
Figure 21: RU Connectors
Identifier Functional Description
POWER Power supply connector
RS-232 5-pin connector connects to PC to realize the local commissioning.
EXT_ALM 7-pin CPC for external alarm interface.
MT Connect to service antenna
OP/UL DL FC/APC type, connect with MU OP port via optical fiber.
Table 9: RU Connections
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3.4.3 COMBINER UNIT CONNECTORS
Connectors on the Combiner Unit are identified below:
TX
RX
1900MHz 850MHz
Figure 22: Combiner Unit Connectors
TX Connects with MU’s TX port on back panel.
RX Connects with MU’s RX port on back panel.
850MHz Connects to 850MHz Node B.
1900MHz Connects to 1900MHz BTS.
Table 10: Combiner Unit Connections
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3.5 EQUIPMENT CONNECTION
3.5.1 GROUNDING CONNECTION
Ground connection
To ensure safe operation of the product, a ground (earth) connection is required. For single phase AC
power source, the product must be grounded by connecting the “earth wire” of the power cord to the
ground terminal of the AC supply. For operating this product with DC power system (such as
rectifiers), the product should not be connected to power systems that switch open the return lead
because the return lead could function as the ground (earth) connection for the equipment.
Protective Ground Connection
The enclosure must be grounded securely by connecting a copper wire (CSA 16mm
2
) to the
grounding terminal on the equipment/rack, and the other end to a protective ground (i.e. building earth
point). An internationally acceptable colour code of the ground connection wire is green/yellow.
Such a ground connection implements the “Protective Ground Connection”, and must be connected
to the equipment at the designated ground point. In general, do not connect the supply before
establishing an adequate ground (earth) connection.
MU Grounding Connection
Connect the grounding terminal located on the back panel of MU to a protective ground (i.e. building
earth point).
RU Grounding Connection
The equipment must be grounded securely. Connect a copper wire to the grounding terminal on the
mounting tab/enclosure, and connect the other end to a protective ground (i.e. building earth point).
An internationally acceptable coloring code of the ground connection wire is green/yellow.
3.5.2 LI-ION BATTERY CONNECTION
Li-ion battery is provided with this system to ensure power is supplied to the system monitoring unit
and MCU and to ensure the alarm message could be sent to OMC effectively in case of mains power
failure.
Caution: Be careful of the risk of explosion if battery is replaced by an incorrect type. Dispose of used
batteries according to the instructions.
3.5.3 RF CONNECTION
Connect MU to POI System or BTSs
For BTS signal connection from a POI system, via co-axial cable, connect the uplink input port on a
POI system to the uplink output port labeled “RX” on MU, and the downlink output port on a POI
system to the downlink input port labeled “TX” on MU.
Connect RU with Antenna
Connect the MT port of RU with TX/RX antenna via coaxial cable.
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3.5.4 CABLE CONNECTION
MU is connected to RU via optical fiber (length<13km). Connect MU back panel’s OP1-OP4 with RU’s
OP interfaces respectively. MU is connected to Combiner Unit via coaxial cable. Connect MU back
panel’s TX/RX with Combiner Unit’s TX/RX ports respectively.
Here takes 5W+5W RU configuration as an example. Refer to the following connection:
850MHz
RX
TX
1900MHz
50/60Hz
200-240V
FUSE RX
OP3OP4 OP2 OP1
TX
EXT_ALM
RS-232
POWER
FAN
MT
Figure 23: Cable Connection
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3.5.5 EXTERNAL ALARM CONNECTION
For RU, this is a 7-pin CPC connector. The following figure and table show the pin allocation and
definition. Pin numbering are shown looking-into the connector on the enclosure.
7
6
35
4
12
Figure 24: Pins Allocation for “EXT_ALM” Port
Pin
number
1 2 3 4 5 6 7
Alarm
definition
EXT.
Alarm 1
EXT.
Alarm 2
EXT.
Alarm 3
GND
EXT.
Alarm 4
Reserved Reserved
Table 11: Pin Definition of “EXT_ALM” Port
3.5.6 BTS ALARM CONNECTION
The equipment alarms can be signaled to the BTS via voltage-free relay contacts. The voltage-free
relay connections are connected to the DB-9 port “BTS_ALAM” located on the MCU of MU. The
following figure and table shows the pin allocation and definition.
1
2
4
3
5
6
7
9
8
BTS_OPEN
BTS_CLOSE
BTS_ COM
Figure 25: Pins Allocation for “BTS_ALM” Port
Pin Number Definition Description
1 BTS_OPEN
Connects to the normally opened terminal of the voltage free
relay.
2 BTS_COM Connects to the common terminal of the voltage free relay.
3 BTS_CLOSE
Connects to the normally closed terminal of the voltage free
relay.
4 ~ 9 NC Reserved.
Depending on OMT/OMC configuration, alarm to BTS can be signaled equipment by either: a) pin1
and pin2 ‘opened’ or b) Pin2 and Pin3 ‘closed’.
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3.5.7 CONNECT TO PC
The local commissioning and management for MU and RU is achieved through connecting to the
OMT PC locally.
Connect MU to PC
Connect the RS-232 port to the serial port of PC with the RS-232 cable supplied to achieve local
monitoring and management. A build-in wireless modem is available for OMC connection to realize
remote commissioning.
Connect RU to PC
Local commissioning and management of RU is achieved through the “RS-232” and the OMT PC via
the RS-232 commissioning cable supplied.
With the equipment enclosure opened, the OMT PC can be connected internally.
End of Section
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4 COMMISSIONING
4.1 PRE-COMMISSIONING TASKS
After equipment installation, perform the following steps before equipment powering and
commissioning, check that the expected voltage, current, and power levels do not violate any ratings.
Double check all connections including ground before applying power. Do not manipulate circuits or
make changes when power is applied:
• Visually inspect the power connection within the equipment. Ensure that the power cable is
correctly and securely connected, including grounding wire, RF cable and optical cable.
• Check grounding connection and verify that the ground resistance is less than 5Ω.
• Connect the equipment to the PC installed with OMT software.
• With the MU switched on, RU installed and all cablings connected, apply power to the RU by
switching on the PSU switch on the integrated PSU.
• Monitor the initialization of the MU though the LEDs on the front panel of MCU unit, while for RU,
it is through the LEDs on the MCU unit integrated. Refer to detailed LEDs information in the next
section.
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4.2 LED INDICATORS
4.2.1 MU LED INDICATORS
Diagnostic LEDs are located on the MU; each indicates the status of a particular function:
Identifier Color Indication
RUN Green
Operation indicator – power is supplied to the MU. Flashes once every
second to indicate normal system operation.
ALM Red Alarm indicator. ON = alarm; OFF = no alarm
MOD Red
For equipment with wireless modem, it stands for both MODEM
initialization indicator
3
and FSK communication. Flashes once every two
seconds to indicate normal communication between MU and RU. For
equipment with LAN port, this LED only for FSK communication.
OP1-OP4 Green
When the green indicators are on, the relative optical channel is in normal
reception.
Table 12: MU LED Indicators
4.2.2 RU LED INDICATORS
LED Diagnostic indicators are located on the MCU integrated in the RU; each indicates the status of a
particular function.
Identifier Colour Indication
LED 5 Green
Operation indicator – power is supplied to the RU. Flashes once every
second to indicate normal system operation.
LED 4 Red Alarm indicator. ON = alarm; OFF = no alarm
LED 3 Red
Diagnostic LED for FSK communication. Flashes once every two seconds
to indicate normal communication between MU and RU.
Table 13: RU LED Indicators
The LEDs LED5, LED4, LED3 will flash simultaneously five times during system self-checking after
equipment power-up. Then LED5 flashes every second to indicate system commissioning can be
proceeded with.
3
Modem initialization indicator on MU front panel: Go off after initialization success. If the indicator is continuous
on then the initiating fails.
* Modem status indicator on MODEM, flashes during initiating, and go off after initialization success. If the
indicator is continuous on then the initiating fails.
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4.3 OMT
The equipment can be monitored and controlled by OMT software running on a local PC with local
commissioning cable, remote connection to the equipment.
z OMT software running on a local PC with serial connection to the equipment.
z OMC (optional) software with remote connection to the equipment.
This chapter is to introduce how to apply local and remote connection to OMT for the first installation,
for the detailed OMT information, please refer to OMT user manual and other references.
Notice: The OMC software with remote connection to the equipment is optional for customers.
4.3.1 LOCAL AND REMOTE CONNECTIONS TO OMT
After installing OMT software on the PC, connection to the equipment can be done locally or remotely.
Double click the OMT explorer icon, the OMT Explorer main screen window will appear.
4.3.2 LOCAL CONNECTION TO OMT
After database configuration is done successfully, the following window will pop up and select [Local
connection via RS-232] for local connection.
Figure 26: Connection Type
Select the desired communication port and click “OK”, it will enter into the main window of OMT.
Figure 27: Serial Port Configuration
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4.3.3 REMOTE CONNECTION TO OMT
If remote connection is needed, users can select [Remote connection via modem] in connection type
window. Select desired serial port and click “OK” in [Serial Port Configuration] window to go to OMT
main window. Click “connect” and the [Remote Connection] window will show up.
Figure 28: Remote Connection
Config: Enter the correct phone number (Users don't have to enter the password) and click “connect”.
After the modem is initialized, it will be connected remotely.
4.3.4 OMT CONFIGURATION
After entering the OMT main screen, click the”Connect” button on the toolbar, to connect the
equipment to the OMT. Successful connection will be indicated by a message “Online OK” and
equipment parameters can be read and/or set.
Users can configure the parameters, and then set the parameters according to desired coverage
level and interference to other BTS signals.
OMT parameters include: Common Information, RF Information, Alarm Information, and Properties
Information.
Figure 29: OMT Main Window
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4.3.5 SYSTEM INFO
Click on [System Info.] within Equipment Information, system information will be displayed in the right
interface of the OMT screen. In the interface the site ID of MU is described and the currently
accessed unit is indicated.
Figure 30: System Information
There are two methods to switch from different sites.
z To switch to the MU or other sites, customer can right click on the message indicating the not
accessed unit. Select [Switch] in the pop-up menu, RU can be successfully switched to MU or
other sites.
z To switch to the MU or other sites, customer can choose MU or other site which is under
monitoring, then click [Switch] on the bottom to switch to MU or other sites.
Figure 31: Switch between MU and RU
4.3.6 RF PARAMETER
It is recommended to configure the following RF parameters for the first installation.
4.3.7 SWITCH
Switch is to enable/disable power for internal modules. When user checks and sets non-RF
parameters, such as checking physical antenna connection, switching off will disable equipment
power temporarily to protect PA in operation.
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Figure 32: RU Switch
Config:
Select the required state in setting columns of RF information window for RF switch, then press
[Enter] or [Config] button to finish the configuration operation.
4.3.8 ATT
Figure 33: MU ATT
Figure 34: RU ATT
Config:
Select the required value in setting columns of RF information window for ATT, and press [Enter] or
[Config] button to finish the configuration operation.
4.3.9 ALARM THRESHOLD
Alarm Threshold includes Power threshold and Temperature threshold.
Users can set alarm threshold according to the specific situation. If the measured value is lower than
the threshold lower limit or more than the threshold upper limit, the appropriate alarm will be
generated.
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Figure 35: MU Alarm Threshold
Figure 36: RU Alarm Threshold
Config:
Enter the required value in setting columns of RF information window for Alarm threshold, and press
[Enter] or [Config] button to finish the configuration operation.
Notice: The input value must be in the range of power threshold.
4.3.10 ALARM INFORMATION
Alarm information operation is to select alarm parameters for monitoring. MU alarm parameters
include Master Alarm, Channel Alarm; RU alarm parameters include Master Alarm and External
Alarm.
Click any tree node in [Alarm Info] group, [Alarm Parameter Information] window will appear in the
right side. The figures below show the alarm information.
Figure 37: MU Master Alarm
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Figure 38: MU Channel Alarm
Figure 39: RU Master Alarm
Figure 40: RU External Alarm
Config:
Tick the check box of [Item select] and [Enable] of the desired parameters and click [config] button to
finish configuration operation.
Notice: [Enable] box
is to enable the alarm monitoring for system. Only if users enable the
alarm by ticking the [Enable] box, the alarms can be monitored by the OMT/OMC.
4.3.11 PROPERTIES INFORMATION
The property parameters include Equipment ID, Chip Info., Equipment Info., Site Location, Trigger
Report that are equipment specified. All properties information, in general, will be displayed in the
right part of the main screen when clicking on each node of the [Properties Info.].
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4.3.12 EQUIPMENT ID
Equipment ID is to be configured after local commission has been completed, which includes Site ID
and Site Sub ID.
Item Description
Site ID Site ID is the unique equipment identification. It is a hexadecimal string of
eight characters in the range of [0x00000000-0xFFFFFFFF]. e.g. 12345678
Site Sub ID Site Sub ID is used for Master-Slave System. It is the unique identification of
each Master/ Slave Unit and is a hexadecimal string of two characters in the
range of [0x00-0xFF]
For the system located with single equipment, the Site Sub ID should be 0xFF.
e.g. 00
For Master-Slave system, the Site Sub ID for Master Unit is 0x00, and the Site
Sub ID for each Slave Unit is represented in the range of [0x00-0xFE] in
ascending order. e.g. Master Site ID: 00 Slave Site ID: 01
Table 14: Equipment ID
NOTE: User can setup the config in RU/MU via same RS232 connector. In order to establish a virtual
link between RU and MU, the RU site sub ID should keep consistency with MU site sub ID. For
example, the site sub IDs have been set as 01 in both RU and MU, double click on the RU sub ID to
access RU from MU. For detail operation, please refer to [System Info.].
Figure 41: MU Equipment ID
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Figure 42: RU Equipment ID
4.3.13 COMM. CONFIG
If the equipment is to be monitored by OMC software, users must finish the MU [Comm. Config.] in
the next step.
The Comm. Config information requires to be manually entered by users after successful connection
to the equipment.
Figure 43: MU Comm.Config
See the table below for configuration details of each parameter.
Item Description
Checking Control Select “Enable” or “Disable” from the drop down menu as shown to enable or
disable the Phone Number Authentication feature. Refer to [Phone No.] in
details.
OMC Server IP Based on the current network conditions, users can enter the IP address
information of the equipment, which is connected to the OMT/OMC via
Ethernet.
Phone No. This is designed for authentication purpose when remote connection via
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modem is required. It is the phone number to dial the equipment. Only the
phone number pre-defined in this field, will it be allowed to dial the
equipment. It is required to manually enter the phone number. Up to 5 phone
numbers are allowed. The use of phone number authentication can avoid
unauthorized use of the OMT. In addition, it can prevent the equipment
receiving piles of spam short messages, thus help the operator greatly
reduce the cost.
Report Config The Report No. is the SIM card number of the modem built into the OMC
Server computer. The equipment will send alarm SMS to this number.
If remote communication is needed via modem, users have to enable SMS
mode and set the report phone No. by entering the SIM card number of the
equipment built-in modem.
SMSC No. It specifies the SMS center. In case users choose SMS communication,
users have to set the service No. of SMSC for the first installation, so that the
alarms can be sent to OMC.
Table 15: Comm.Config.
4.3.14 DATA MAINTENANCE
Refer to OMT V4.0 Software Product Manual.
4.4 NON-VOLATILE MEMORY
A non-volatile storage device on the MCU holds the configuration of the equipment. The following
information is preserved in the event of power-loss:
Network Configuration
Device ID
SMS report mode including SMS center number and OMC report number setting
Operating Parameters
Pre-ATT
Switch
Output Power
Gain
Downlink Input Power
Alarm thresholds
End of Section
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5 OPERATION
Following installation and commissioning, occasional operation tasks to handle alarms may be
required:
Alarm condition Diagnosis
UL LNA, DL PA
alarms
Check power and signal connections of respective modules. If the power
and signal wire connections are OK, then the respective modules may be
faulty. Replace the faulty modules and return it to the factory for repair.
DL Input Power
Overload alarm
Eliminate alarm by correct setting of DL Input Power Overload threshold. If
the setting is OK but alarm persists, the DL input power might be higher than
the threshold. Increase the attenuator to reduce the input power or replace
the coupler with a new one of high coupling effect. Check the cable
connection of the DT port to the BTS.
Chassis Lock alarm Check whether the enclosure door is closed.
MCU Battery Fault
Alarm
Replace the faulty modules and return it to the factory for repair.
Optical Transceiver
Alarm
The optical TX part of Optical TX/RX Module is faulty. Check and replace the
faulty module and return it to the factory for repair.
Optical Receiver
Alarm
The optical power at the RX port of the Optical TX/RX Module is lower than
the minimum requirement, which is resulted by the faulty of the optical TX
part of Optical TX/RX Module or damaged optical fiber link. If so, replace the
optical Tx module. If not, check the working status of the optical fiber to
eliminate the alarm.
Equipment Over
Temperature alarm
Eliminate alarm by correct setting of temperature threshold, including normal
and severe. If alarm can not be cleared, apply climatic protection to the
equipment.
Power Down / Power
Fault alarm
Check AC power cable and verify AC mains supply is normal. During Power
Fault alarm, DC power supply has no output. Check if DC output power is
overloaded or short-circuited. The PSU could be faulty.
Master-Slave
Monitor Link Alarm
The communication between the MU and RU is abnormal. Check the
working status of Optical TX/RX Module and FSK.
External Alarm 1~4 Check to make sure if the external device connected is working normally
Table 16: Alarms Diagnosis
End of Section
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6 MAINTENANCE
The RA-7100 system is designed for trouble-free operation and generally does not need
maintenance. Maintenance activities should only be carried out by trained personnel.
The equipment operation status can be observed remotely through OMT/OMC.
Periodic inspection of the repeater equipment(s) is recommended. The recommended tasks include:
• Measurement of the return loss of the feeder system.
• Ensure the stable connection of cables, power cords and facilities located indoor.
• Inspect and record operation status and parameters, such as receive signal level, DL output
power of the repeater, from OMC or OMT.
• Check the PSU voltage of MU.
• Verify that the actual coverage effects have not degraded.
• Check the working status of optical TX/RX power.
• Check the controlling and monitoring function.
• Verify lightning and grounding protection is in good condition.
End of Section
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7 APPENDICES
7.1 APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE
The following are the recommended list of tools new installation and routine maintenance:
• Electronic drill
• Adjustable spanner
• Allen Key (5.5mm)
• Pentagon Key Wrench
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7.2 APPENDIX B: SERVICING POLICY AND RETURN OF EQUIPMENT
The repair of individual units and modules of this equipment is not considered practicable without
factory facilities. It is, therefore, the policy of Comba whereby faulty units or modules are returned to
the local agent for repair.
To enable an efficient, prompt after sales service to be provided for the diagnosis, repair and return of
any faulty equipment, please comply with the following requirements.
Items to be sent for repair should be packaged so as to provide both electrostatic and physical
protection and a Repair Material Authorization (RMA) should be completed giving the required
information. A sample RMA form is provided in Appendix.
This request must be included with the item for repair. Items for repair should be sent to the nearest
Comba office:
COMBA TELECOM LTD.
Hong Kong Office
Address: 611 East Wing, No. 8 Science Park West Avenue, Hong Kong Science Park, Tai Po, Hong
Kong.
Tel: +852 2636 6861 Fax: +852 2637 0966
Singapore Office
Address: No. 1 Kaki Bukit View, #02-10 Techview, Singapore 415941
Tel: + 65 6345 4908 Fax: + 65 6345 1186
Thailand Office
Address: 3rd Floor, T. Shinawatra Building, 94 Sukhumvit Soi 23, Sukhumvit Road, Klongtoeynua,
Wattana, Bangkok 10110
Tel: +66 2664 3440 Fax: +66 2664 3442
India Office
Address: Suite No. 2, E-172, TSH House, Greater Kailash – I, New Delhi – 110 048, India
Tel: + 91 11 4173 9997 / 8 Fax: + 91 11 4173 9996
Sweden Office
Address: Gustavslundsvagen 147, S- 167 51 Bromma, Stockholm, Sweden
Tel: +46 8 25 38 70 Fax: +46 8 25 38 71
Brazil Sales Office
Address: Avenida Engenheiro Luiz Carlos Berrini 1297, cj 122, 04571-090 Brooklin Novo, São Paulo,
Brazil
Tel: +55 11 35093700 Fax: +55 11 35093720
Dubai Office
Address: P.O. Box 450583, DUBAI, U.A.E.
Tel: +971 0 4 433 5320 Fax: +971 0 4 422 6774
US Office
Address: Comba Telecom Inc. 2390 Bering Drive, San Jose, CA 95131, USA
Tel: +1 408 526 0180 Fax: +1 408 526 0181
China Office
Address: No.10, Shenzhou Road, Guangzhou Science City, Guangzhou, China
Tel: + 86 20 2839 0000 Fax: + 86 20 2839 0136
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7.3 APPENDIX C: RMA (RETURN MATERIAL AUTHORIZATION) FORM
End of Section
End of Document
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