COMBA RA-7100 User manual

USER MANUAL FOR RA-7100
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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This is an unpublished work the copyright in which vests in Comba International ("Comba").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
1GENERAL INFORMATION ................................................................................................... 9
2EQUIPMENT 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
3INSTALLATION ...................................................................................................................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
4COMMISSIONING............................................................................................................... 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
5OPERATION........................................................................................................................ 46
6MAINTENANCE ..................................................................................................................47
7APPENDICES......................................................................................................................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 (AGC1): 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.
1It 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
482
360
MU with Wireless Modem
44
360
482
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
330
482
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
L N E
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
E N L
MODEL:
S/N NO.:
Optical TX/RX Module
9
51
69
51
6
6
15
9
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:
Combiner
Surge
Arrestor
RFModule
Optical
TX/RX
Module
MCU
Door Open Switch
Li-ion Battery
+
2
BAT
OUTOK
INOK
GND
+
V 9
+
V
28
-
V
28
+
V
28
-
V
28
-
V 9
+
JK
-
JK
- 2
BAT
L
E
N
PSU
OPIN/OUT
RFIN
RFOUT
1900MHz
PA
850MHz
PA
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 Φ84
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 oC and the relative humidity is at most 85%.
Direct day light to the RU should be avoided. If the direct day light temperature exceeds 40oC, 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.