COMBA RD-1820 Technical Document

EQUIPMENT MANUAL FOR RD-1820
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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:
International Documentation Centre
Comba Telecom
RD-1820
GSM1800 BANDWIDTH ADJUSTABLE
REPEATER
EQUIPMENT MANUAL
This is an unpublished work the copyright in which vests in Comba International ("Comba").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.

EQUIPMENT MANUAL FOR RD-1820
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0.2 CONTENTS
Section Page
0.2 CONTENTS.............................................................................................................................................2
0.3 INDEX TO FIGURES AND TABLES....................................................................................................4
0.4 HISTORY .................................................................................................................................................5
0.5 ISSUE CONTROL ..................................................................................................................................6
0.6 REFERENCES........................................................................................................................................7
0.7 GLOSSARY OF TERMS .......................................................................................................................8
0.8 SAFETY NOTICES AND ADMONISHMENTS...................................................................................9
0.9 SERVICING POLICY AND RETURN OF EQUIPMENT.................................................................10
0.10 READERS COMMENTS .....................................................................................................................11
1RD-1820 REPEATER INTRODUCTION...........................................................................................12
2EQUIPMENT DESCRIPTION .............................................................................................................13
2.1 RD-1820 FUNCTIONAL BLOCK DIAGRAM ....................................................................................13
2.2 EQUIPMENT LAYOUT ........................................................................................................................13
2.3 MANUFACTURING ENTITIES ...........................................................................................................15
2.4 KIT OF PARTS......................................................................................................................................15
2.5 TECHNICAL SPECIFICATIONS ........................................................................................................16
2.5.1 ELECTRICAL AND POWER...............................................................................................................16
2.5.2 OPERATION & MAINTENANCE........................................................................................................17
3INSTALLATION.....................................................................................................................................18
3.1 WARNINGS AND ALERTS.................................................................................................................18
3.2 SITE PLANNING CONSIDERATIONS..............................................................................................19
3.2.1 REPEATER INSTALLATION CHECKLIST.......................................................................................20
3.2.2 ANTENNA INSTALLATION CONSIDERATION ..............................................................................20
3.3 INSTALLATION PROCEDURES .......................................................................................................21
3.3.1 GOODS INWARDS INSPECTION.....................................................................................................21
3.3.2 TOOLS ...................................................................................................................................................21
3.3.3 PREPARATION ....................................................................................................................................21
3.4 MOUNTING OPTIONS ........................................................................................................................21
3.4.1 WALL MOUNTING OPTION...............................................................................................................21
3.4.2 WALL MOUNTING DETAILS..............................................................................................................22
3.4.3 POLE MOUNTING DETAILS..............................................................................................................23
3.4.4 DRIP-LOOP...........................................................................................................................................23
3.4.5 EQUIPMENT CONNECTIONS...........................................................................................................24
4COMMISSIONING................................................................................................................................25
4.1 MCU LED INDICATORS .....................................................................................................................25
4.2 EQUIPMENT POWER-UP ..................................................................................................................25
4.3 OMT OVERVIEW..................................................................................................................................26
4.4 NON-VOLATILE MEMORY.................................................................................................................27
4.5 PREPARATION FOR REMOTE CONNECTION OF OMT USING WIRELESS MODEM.........28
4.6 PHYSICAL CONNECTION OF OMT TO EQUIPMENT .................................................................28
4.7 LOCAL COMMISSIONING..................................................................................................................29
4.7.1 USING OMT SOFTWARE...................................................................................................................29
4.7.2 DESCRIPTION OF PARAMETERS...................................................................................................32
4.8 COMMISSIONING PROCEDURES...................................................................................................37
5OPERATION .........................................................................................................................................38

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6MAINTENANCE....................................................................................................................................39
7APPENDICES .......................................................................................................................................40
7.1 APPENDIX A: TOOLS .........................................................................................................................40
7.2 APPENDIX B: OMT INSTALLATION AND UN-INSTALLATION...................................................41
7.2.1 ENVIRONMENT FOR OMT OPERATION........................................................................................41
7.2.2 INSTLLATION OF OMT EXPLORER ................................................................................................42
7.2.3 INSTALLING RD-1820 COMPONENT..............................................................................................44
7.2.4 RD-1820 COMPONENT UN-INSTALLATION..................................................................................45
7.2.5 OMT EXPLORER UN-INSTALLATION.............................................................................................45
7.3 APPENDIX C: OMT EXPLORER V2.10 INTRODUCTION ............................................................46
7.3.1 PULL DOWN MENU ............................................................................................................................47
7.3.2 TOOLBAR..............................................................................................................................................47
7.4 APPENDIX D: CHANNEL NUMBER AND FREQUENCY TABLE ................................................48
7.5 APPENDIX E: RMA (RETURN MATERIAL AUTHORIZATION) FORM ......................................51

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0.3 INDEX TO FIGURES AND TABLES
Figure 1: Front and side views of enclosure ................................................................................................ 12
Figure 2: RD-1820 functional block diagram................................................................................................ 13
Figure 3: Layout view of equipped product.................................................................................................. 13
Figure 4: Mounting rack dimension.............................................................................................................. 21
Figure 5: Wall mounting overview................................................................................................................ 22
Figure 6: Pole mounting overview................................................................................................................ 23
Figure 7: Equipment connections................................................................................................................. 24
Figure 8: Location of MCU and LEDs .......................................................................................................... 25
Figure 9: Wireless modem ........................................................................................................................... 28
Figure 10: OMT explorer V2.10.................................................................................................................... 29
Figure 11: Connection to the equipment...................................................................................................... 30
Figure 12: OMT screenshot - communication setup.................................................................................... 30
Figure 13: OMT Screenshot –online ok ....................................................................................................... 31
Figure 14: Alarm parameters........................................................................................................................ 35
Figure 15: OMT software installation window .............................................................................................. 42
Figure 16: Components selective window.................................................................................................... 42
Figure 17: Installation of OMT explorer completed...................................................................................... 43
Figure 18: Installation of RD-1820 component completed........................................................................... 44
Figure 19: RD-1820 component unistallation - confirmation........................................................................ 45
Figure 20: OMT Explorer uninstallation - acknowledgement....................................................................... 45
Table 1: RD-1820 manufacturing entities..................................................................................................... 15
Table 2: RD-1820 KOP ................................................................................................................................ 15
Table 3: Electrical, power and mechanical specifications............................................................................ 16
Table 4: Management of RD-1820............................................................................................................... 17
Table 5: Repeater installation checklist........................................................................................................ 20
Table 6: Antenna installation checklist......................................................................................................... 20
Table 7: MCU LEDs...................................................................................................................................... 25
Table 8: Management - network parameters............................................................................................... 32
Table 9: Management - RF parameters....................................................................................................... 33
Table 10: Management - Alarm list .............................................................................................................. 34
Table 11: Adjustable alarm threshold........................................................................................................... 34
Table 12: Commissioning procedures.......................................................................................................... 37
Table 13: Alarms diagnosis.......................................................................................................................... 38

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0.4 HISTORY
Change No. ENU Details Of Change
1 1-0-0 Initial document created for CE certification and issued in May 2006.
Updated base product name: RD-1820 = R-1810AC

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0.5 ISSUE CONTROL
Date 30
May
2006
Section
All All

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0.6 REFERENCES
0.6.1 RD-1820 datasheet
Control: 1-0-0/A1
Datasheet issued by PM on 19 May 2006.
0.6.2 R-1810AC QE 1-2-0 Equipment manual released in Oct 2005.

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0.7 GLOSSARY OF TERMS
Abbreviation Definition
ALC Automatic Level Control
ATT Attenuation
BS Base Station
BTS Base Transceiver Station
dB Decibel
dBm Decibels relative to 1 milliwatt
DL Downlink
DT Donor Terminal
DPX Duplexer
EEPROM Electrically Erasable Programmable Read Only Memory
FS Frequency Selector
GSM Global Standard for Mobile Communication
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
PLL Phase Locked Loop
PSU Power Supply Unit
RF Radio Frequency
OMT Operation and Maintenance Terminal
PLL Phase Locked Loop
PSU Power Supply Unit
SIM Subscriber Identification Module
SMA Sub-Miniature A Connector
SMS Short Message System
UL Uplink
VAC Volts Alternating Current
VSWR Voltage Standing Wave Ratio

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0.8 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,
authorised personnel. At all times, personnel must comply with any safety notices and instructions.
Specific hazards are indicated by symbol labels on or near the affected parts of the equipment. The labels
conform to international standards, are triangular in shape, and are colored black on a yellow background.
An informative text label may accompany the symbol label.
Hazard labelling 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 Notices:
These draw the attention of personnel to hazards which may cause death or injury to the operator or others.
Examples of use are cases of high voltage, laser emission, toxic substances, point of high temperature, etc.
Alert Notices:
These draw the attention of personnel to hazards which may cause damage to the equipment. An example
of use is the case of static electricity hazard.
Caution notices may also be used in the handbook to draw attention to matters that do not constitute a risk of
causing damage to the equipment but where there is a possibility of seriously impairing its performance, e.g.
by mishandling or gross maladjustment. Warnings and Cautions within themain text do not incorporate
labels and may be in shortened form.

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0.9 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 (a sample of this is in the appendix) completed giving the required
information
This request must be included with the item for repair, items for repair should be sent to the nearest Comba
office:
COMBA TELECOM SYSTEMS, LTD.
Hong Kong Office
Address: Room 1503-10 Delta House, 3 On Yiu Street, Shatin, Hong Kong.
Tel: + 852 2636 6861
Fax: + 852 2637 0966
Email: [email protected]
Singapore office
Address: 865 Mountbatten Road #05-43, Katong Shopping Centre, Singapore 449408
Tel: + 65 6345 4908
Fax: + 65 6345 1186
Email: [email protected]
Sweden Office
Address: Comba Telecom Systems AB, Gustavslundsvagen 147, S- 167 51 Bromma,
Stockholm, Sweden
Tel: [phone]
Fax: [phone]
Email: [email protected]
China R&D and Manufacturing Base
Address: No.6, Jinbi Road, Guangzhou Economic and Technological Development District,
Guangzhou, China.
Tel: + 86 20 8222 5788
Fax: + 86 20 8222 6121
Email: [email protected]

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0.10 READERS COMMENTS
Whilst every endeavour is made to ensure the accuracy of this and all Comba documents, there is always
the possibility that an inaccuracy or omission could occur.
In order that any amendment/remedial action can be carried out promptly, we would appreciate your
co–operation in filling out and returning a photocopy of this customer reply sheet as soon as possible.
Customer Information:
Name
Title
Company
Date
Address
Telephone Number
Customer Comments:
Equipment title
ENU 1-0-0
Page number
Paragraph number
Line number
Figure number
Details of inaccuracies
Other comments
Contact points:
International Documentation Centre
E-mail: [email protected]
FAX: [phone]
End of section

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1 RD-1820 REPEATER INTRODUCTION
The RD-1820 bandwidth adjustable repeater is designed for GSM1800. Band-specific linear amplifier and
filter effectively amplifies the desired BTS carriers and provides superior out-of-band rejection. Typical units
incorporate programmable bandwidth up to 19MHz to suit requirements of the network. Remote
configuration and surveillance is possible through Comba’s remote control and monitoring system, via PC or
wireless modem to the OMT/OMC. Internal Li-ion backup battery ensures alarm signals are sent out during
power failure. The RD-1820 comes in a completely sealed, cast aluminum enclosure, suitable for operation
in all weather conditions.
Main features of RD-1820:
zBandwidth adjustable from 2 to 15 or 19MHz.
zAutomatic control to avoid self oscillation caused by low isolation between donor (DT) and mobile (MT)
antennas.
zIntegrated wireless modem for remote configuration, monitoring and control.
zInternal backup battery keeps the alarm unit running for up to three hours after power failure.
zOptional OMC available for remote operation and maintenance of a group of repeaters.
zDesigned for outdoor application – waterproof, damp-proof and omni-sealed (IP65).
Shown below are the mechanical drawings of RD-1820 enclosure.
195450
600
Figure 1: Front and side views of enclosure
End of section

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2 EQUIPMENT DESCRIPTION
2.1 RD-1820 FUNCTIONAL BLOCK DIAGRAM
Mobile
Ant
Donor
Ant
Downlink
Uplink
Mobile
Power
Supply
Alarm
Indicator Main Control Unit
External
Power
OMT
Li-ion
BATT
Modem
M-ATT
f2
Band
Filter
f2
Band
Filter f1
f1
ALC
UL Freq Select Module
M-ATT
f2 f2
Band
Filter
Band
Filter
f1 f1
ALC
DL Freq Select Module
LNA2
DT MT
OMT
Computer with
Data card
Wireless
Modem
OMC
C-ATT
C-ATT
PA1
PA2
LNA1
Figure 2: RD-1820 functional block diagram
2.2 EQUIPMENT LAYOUT
Lock
DL FS
DPX
DT MT
PSU
Surge
protector
DL LNA UL LNA
Li-ion
battery
Distribution board
MCU
DPX
DL PA UL FS
Wireless modem
GND GND
UL PA
RS232
Filter Filter
Figure 3: Layout view of equipped product

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Typical RD-1820 units consist of the following components:
Frequency Selector (FS):
Frequency selector (FS) can select the required signal and reject the other unwanted signals effectively.
Power Amplifier (PA):
It fulfils power amplification in both of UL and DL branches.
Low Noise Amplifier (LNA):
Located along the top edge of the equipment are UL and DL low noise amplifiers (LNAs), these are installed
respectively in UL branch and DL branch. The repeater UL/DL ATT value corresponds individually to UL/DL
LNA gain.
Main Control Unit (MCU):
The MCU is used to monitor and control the operation parameters of the repeater and provides
telecommunication interface for remote control and indicator. LED indicators (L1~L4) indicate the respective
operation status.
Duplexer (DPX):
The DPX is located towards the DT and MT connections, used to combine/divide the UL and DL signals.
Power Supply Unit (PSU):
The PSU converts the input 220VAC into stable DC to supply power to FS, PA, LNA, MCU and to charge
Li-ion battery.
Surge protector:
The Surge protector is mounted next to the PSU. Within it there are three connections: 220V VAC Live,
Neutral and ground. This provides protection to the PSU. It is assumed the antenna system will have ample
lightning protection themselves. On the top of each surge protector is a little window, beneath which is a
colored indicator, ‘Green’ indicate protection is available, and in the event of a fault, these will turn to ‘Black’,
and has to be replaced.
Wireless Modem:
It is mounted adjacent to the MCU, it has connection of RF, data and power. It is used for remote control and
the MCU sends out alarms to the repeater OMC via the wireless modem. On the modem there is an indicator
LED to show modem status.
Li-ion Battery:
The Li-ion battery-pack is enclosed within a plastic cover and provides back-up supply to the MCU for up to
3 hours in the event of mains failure.
Distribution Board:
The Distribution board serves as a distributor for power and internal communication within the repeater. It is
also called distribution board (backplane), on which located the following connections: connectivities to
function modules, MCU, RS232 port (‘X18’) for local control.

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2.3 MANUFACTURING ENTITIES
RD-1820 is composed of modules with the following identifiers.
Product Code Description
PA-4250CSS01D Downlink broadband power amplifier
PA-4250CSS01U Uplink broadband power amplifier
FB-C1842.5B12.4SS06 Downlink broadband frequency selector
FB-C1747.5B12.4SS06 Uplink broadband frequency selector
LA-1040DSSD Low noise amplifier
FD-U1732.5D1827.5B45SS07 Duplexer
RC-5SK/SK/SK-30C DT coupler
R-9110AC1-M1 Main control unit
R-9110AC1-BB Distribution board
WM02 Wireless modem
PC222435A-1(26V) Power supply unit
3.6V/1300mAh × 6 Li-ion battery
V20-C/2 Surge protector
Table 1: RD-1820 manufacturing entities
2.4 KIT OF PARTS
The following table shows the kit of parts supplied with the equipment.
Product Identifier Description Qty.
R-9122C8-5140/1 Mounting rack (kit) 1
M10x110 Masonry bolt for pole mounting 8
M10x85x110 U bolt for pole mounting 2
5.5mm Allen key 1
R-9122C/R-9122AC (Marked ‘9122) RS-232 cable 1
Label “9122” Key 2
6.3A Replacement fuse for PSU 2
RD-1820 QE 1-0-0 This Manual 1
V2.10 OMT Explorer software
V1.00 (component) OMT software 1
Table 2: RD-1820 KOP

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2.5.2 OPERATION & MAINTENANCE
Local Monitoring Feature PC via RS232
Remote Data Transfer Integrated wireless modem (data or SMS), OMC(Optional)
Local and Remote Controlled Parameters Channel No. Range, ATT, Soft ON/OFF, Oscillation Elimination
ON/OFF, Over-Temp Threshold, DL Output Power Threshold, DL Input
Power Threshold, Alarm Report Enable
Local and Remote Monitored Parameters Alarms (LNA, PA, PLL unlock, Power Down, PSU Fault, Door Open,
Self oscillation, DL Input Power Low, Over Temp, VSWR, DL Output
Power Low), UL/DL Output Power, DL Input Power
Table 4: Management of RD-1820
End of section

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3 INSTALLATION
3.1 WARNINGS AND ALERTS
Radio Frequency energies
There may be situations, particularly the workplace environments adjacent to 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.
Assume that other RF energies exist in the vicinity, maintain a minimum distance of 1m between the human
beings.
High voltage
The equipment has been designed and constructed as to prevent as far as reasonably practicable danger.
Any activity, such as installation, operation and maintenance, on or near the equipment must be as far as
reasonably free from danger.
Where there is a risk of damage to electrical systems due to adverse weather, extreme temperatures, wet,
corrosive or dirty conditions, flammable or explosive atmosphere, then the system must be suitably installed
to avoid such a danger.
To reduce the risk of damage to the equipment and to the customer, shut down the equipment and take
action to isolate mains supply when performing any intrusive actions.
Protective Earthing
Equipment must be well grounded for the purpose of protecting individuals from electrical risk.
Handling Precautions
Precautions should be taken in equipment handling activities including lifting, lowering, pushing, pulling,
carrying, moving or holding, or the activities to prevent an object, animal or other aspects going into the
chassis, or the activities when extra efforts are needed such as pulling a lever, or operating power tools.
ESD
Take necessary precautions when handling ESD-sensitive devices. Assume that all solid-state electronic
devices are ESD-sensitive. Do use a grounded wriststrap or the like 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 repeater is designed to be waterproof, rainproof, and with snow protection. Temporary protection should
be taken when the equipment chassis is opened for installation or maintenance in an outdoor environment.
The equipment must not be opened for installation or maintenance in bad weather (e.g. gale, storm rainfall,
extreme temperatures and high humidity)
Installation location
Mounting surface shall be suitable to support weight of the equipment: for RD-1820, this is about 37 kg.
Environmental
Humidity has an effect on the reliability of the equipment. It is recommended to install the equipment in
location having stable temperature and un-restricted air-flow.
RD-1820 equipment has been designed to operate in the ambient air temperature range of -33°C to +55°C
at ≤95% relative humidity. Should the direct day light temperature exceeds +40°C, then barrier device
should be installed in to protect the equipment to limit sunlight exposure.
Powering
The power supply unit (PSU) provides power to all modules within the chassis. The PSU operates at 200 –
240; 50/60Hz. It is recommended that the PSU operate on a dedicated AC circuit breaker or fused circuit.
In order to avoid electromagnetic interference, select the RD-1820 mounting location to minimize
interference from electromagnetic sources such as high powered equipment.
Grounding requirement
Verify the equipment has been well grounded, this includes antennas and all cables connected. Ensure
lightning protection for the antennas is properly grounded.
Cable routing
Four cables entries to the equipment: Two co-axial (connection for MT and DT), one 220VAC mains-power
cable and 1x RS-232 commission cable during commissioning with the door open.
Manual handling
During transportation and installation, take necessary handling precautions to avoid potential physical injury
to the installation personnel or damages to the equipment.

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3.2.1 REPEATER INSTALLATION CHECKLIST
Installation Location Requirement Considerations
Working Space available Ample space on mounting pole or wall surface.
Recommended: 800mm×800mm×800mm
AC power supply at each installation location:
200 – 240; 50/60Hz
Power cord length is 2m (6.5 ft), use a dedicated AC
breaker or fused circuit, and with good access to an
earthing point.
EMC and interference Do not locate near large transformers or motors that
may cause electromagnetic interference.
Maintain distance from chassis to DT, MT
antennas
Reduce of signal loss in feeder cable
Suitable operating environment -33 to +55C at Maximum 95% relative humidity.
Table 5: Repeater installation checklist
3.2.2 ANTENNA INSTALLATION CONSIDERATION
Installation Location Requirement Considerations
Locate donor antenna in a site to receive the
maximum signals from the desired BTS and to
shield the other signals at the same time.
Field intensity of receiving site: Typical mobile phone
test field intensity ≥-70dBm
Locate the mobile antenna in a position
determined from site survey and site planning.
Isolation of donor antenna and mobile antenna
(I) must be larger than the maximum gain of the
repeater in operation
I > Gmax+ 15dB
Table 6: Antenna installation checklist

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3.3 INSTALLATION PROCEDURES
3.3.1 GOODS INWARDS INSPECTION
zVerify the number of packages received against the packing list.
zCheck all packages for external damage; report any external damage to the shipping carrier. If there is
damage, a shipping agent should be present before unpacking and inspecting the contents because
damage caused during transit is the responsibility of the agent.
zOpen and check each package against the packing list. If any items are missing, contact Comba.
zDo not remove items from antistatic packing until installation. If damage is discovered at the time of
installation, contact the shipping agent.
3.3.2 TOOLS
See appendix A for a full list of tools required for new installation and routine maintenance.
3.3.3 PREPARATION
Repeater:
zMounting surface or pole capable of support chassis’ weight: < 37 kg (82 lb.)
zPower outlet within 2m / 6.5 ft.
zTerminate unused antenna ports with a 50 ohm terminator.
zEarthing point/Safety ground within 2m / 6.5 ft.
Antenna:
zAntenna installation is covered by their respective manuals. Take normal precautions when preparing
and handling feeder cables to ensure they are not damaged.
3.4 MOUNTING OPTIONS
3.4.1 WALL MOUNTING OPTION
The following figure shows the dimension of mounting rack, which is used for mounting the equipment to wall
or on a pole.
400
200
85
14
465
Figure 4: Mounting rack dimension