Comba Telecom SR-1910 User manual

INSTALLATION GUIDE FOR SR-1910
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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
SR-1910
GSM1900 BAND ADJUSTABLE
REPEATER
INSTALLATION GUIDE
This is an unpublished work the copyright in which vests in Comba International ("Comba"). All rights reserved.
The information contained herein is confidential and the property of Comba and is supplied without liability for errors or omissions.
No part may be reproduced, disclosed or used except as authorized by contract or other written permission. The copyright and the
foregoing restriction on reproduction and use extend to all media in which the information may be embodied.

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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
1SR-1910 REPEATER INTRODUCTION ................................................................................ 12
2EQUIPMENT DESCRIPTION................................................................................................. 14
2.1 SR-1910 FUNCTIONAL BLOCK DIAGRAM .......................................................................... 14
2.2 GENERAL APPLICATIONS ................................................................................................... 15
2.3 EQUIPMENT LAYOUT........................................................................................................... 16
2.4 EQUIPMENT CONSTITUTION .............................................................................................. 17
3INSTALLATION ...................................................................................................................... 18
3.1 WARNINGS AND ALERTS .................................................................................................... 18
3.2 SITE PLANNING CONSIDERATIONS................................................................................... 19
3.2.1 INSTALLATION CHECKLIST................................................................................................. 20
3.3 INSTALLATION PROCEDURES ........................................................................................... 21
3.3.1 GOODS INWARDS INSPECTION ......................................................................................... 21
3.3.2 TOOLS.................................................................................................................................... 21
3.3.3 MOUNTING ARRANGEMENT............................................................................................... 21
3.3.4 WALL MOUNTING DETAILS ................................................................................................. 22
3.3.5 DRIP-LOOP............................................................................................................................ 22
3.4 EQUIPMENT CONNECTORS ............................................................................................... 23
3.5 EQUIPMENT CONNECTIONS .............................................................................................. 24
3.5.1 GROUNDING CONNECTION................................................................................................ 24
3.5.2 SERVICE VOLTAGE CONNECTION .................................................................................... 24
3.5.3 LI-ION BATTERY CONNECTION .......................................................................................... 24
3.5.4 RF CABLE CONNECTION..................................................................................................... 24
3.5.5 PHYSICAL CONNECTION TO OMT PC ............................................................................... 25
3.5.6 PHYSICAL CONNECTION BETWEEN MASTER AND SLAVE UNIT................................... 25
3.5.7 EXT_ALM CONNECTION...................................................................................................... 26
3.6 PREPARATION FOR REMOTE CONTROL OF EQUIPMENT USING WIRELESS
MODEM .................................................................................................................................. 27
4COMMISSIONING.................................................................................................................. 29
4.1 PRE-COMMISSIONING TASKS ............................................................................................ 29
4.2 EQUIPMENT LED INDICATORS........................................................................................... 29
4.3 OMT........................................................................................................................................ 30
4.3.1 OMT SOFTWARE INSTALLATION ....................................................................................... 31
4.3.2 OMT SOFTWARE VERSION ................................................................................................. 31
4.3.3 NON-VOLATILE MEMORY.................................................................................................... 31
4.4 CONNECTION OF THE OMT TO EQUIPMENT ................................................................... 31
4.5 DESCRIPTION OF PARAMETERS ....................................................................................... 32
4.5.1 COMMON INFORMATION..................................................................................................... 32
4.5.2 RF INFORMATION................................................................................................................. 33
4.5.3 ALARM INFORMATION ......................................................................................................... 34
4.5.4 PROPERTIES INFORMATION .............................................................................................. 35
4.6 FAULT MANAGEMENT ......................................................................................................... 35

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4.6.1 ALARM ACKNOWLEDGEMENT ........................................................................................... 36
4.7 COMMISSIONING PROCEDURES ....................................................................................... 37
5MAINTENANCE .....................................................................................................................38
6APPENDICES......................................................................................................................... 39
6.1 APPENDIX A: TOOLS............................................................................................................ 39
6.2 APPENDIX B: RMA (RETURN MATERIAL AUTHORIZATION) FORM ................................ 40

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0.3 INDEX TO FIGURES AND TABLES
Figure 1: Front, side and bottom views of the SR-1910 enclosure............................................................ 13
Figure 2: SR-1910 functional block diagram.............................................................................................. 14
Figure 3: Centralized remote control and monitoring ................................................................................ 15
Figure 4: Centralized local control and monitoring .................................................................................... 15
Figure 5: Layout of the SR-1910................................................................................................................ 16
Figure 6: Wall mounting overview.............................................................................................................. 21
Figure 7: Wall mounting overview.............................................................................................................. 22
Figure 8: Equipment connectors ................................................................................................................ 23
Figure 9: Pin allocation and definition of the RS-232 port ......................................................................... 25
Figure 10: Pin allocation and definition of the RS-485 port ....................................................................... 25
Figure 11: Pins allocation for 7-pin EXT_ALM connector for external alarms........................................... 26
Figure 12: Wireless modem ....................................................................................................................... 27
Figure 13: Diagram of wireline modem...................................................................................................... 28
Figure 14: OMT main screen ..................................................................................................................... 30
Figure 15: System information window...................................................................................................... 32
Figure 16: Switch configuration window .................................................................................................... 34
Table 1: SR-1910 variants ......................................................................................................................... 12
Table 2: The SR-1910 connectors ............................................................................................................. 23
Table 3: External alarm signal definition.................................................................................................... 26
Table 4: Voltage applied to EXT_ALM pin................................................................................................. 26
Table 5: Wireline modem connectors ........................................................................................................ 28
Table 6: Wireline status LEDs.................................................................................................................... 28
Table 7: MCU LEDs ................................................................................................................................... 29
Table 8: SR-1910 RF parameters description ........................................................................................... 33
Table 9: Alarm list ...................................................................................................................................... 34
Table 10: Properties Info descriptions ....................................................................................................... 35
Table 11: Alarm diagnosis ......................................................................................................................... 36
Table 12: Commissioning procedures ....................................................................................................... 37

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0.4 HISTORY
Change No. ENU Details Of Change
1 1-0-0 First developed and issued in April 2007.
2 1-1-0 Document is restructured, sections of KOP and Maintenance
deleted; description on Master and Slave Unit revised.
3 1-1-1 Address of HK office has been updated

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0.5 ISSUE CONTROL
Date 13
Sep
06
14
Jun
07
Section
All All All

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0.6 REFERENCES
0.6.1 SR-1910-C1/C2
SR-1910-1001YH
SR-1910 GSM900 Indoor Band Adjustable Repeater
Original Manual, released in August, 2006
0.6.2 SR-1910 DS 2-2-2 Datasheet released on 26-Mar-2007.
0.6.3 OMT v3.20 QE 1-1-0 OMT product user manual released in Feb 2007.

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0.7 GLOSSARY OF TERMS
Abbreviation Definition
ALC Automatic Level Control
ATT Attenuator
BTS Base Transceiver Station
CH Channel
CSA Cross Sectional Area
dB Decibel
dBm Decibels relative to 1 milliwatt
DL Downlink
DT Donor Terminal
DPX Duplexer
FS Frequency Selection
FSA Frequency Selection Amplifier
GSM Global Standard for Mobile Communication
Hz Hertz
ID Identification
IF Intermediate Frequency
LNA Low Noise Amplifier
LOS Line-of-Sight
MCU Main Control Unit
MHz Megahertz
MT Mobile Terminal
MTBF Mean Time Between Failures
NF Noise Figure
OMC Operation & Maintenance Center
OMT Operation & Maintenance Terminal
PA Power Amplifier
PLL Phase Locked Loop
PSU Power Supply Unit
RF Radio Frequency
SIM Subscriber Identification Module
SMA Sub-Miniature A Connector
SMS Short Message Service
UL Uplink
VAC Volts Alternating Current
VDC Volts Direct 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,
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 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 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 Notices:
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.

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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 and prompt after sales service 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 B.
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, Hong Kong.
Tel: + 852 2636 6861
Fax: + 852 2637 0966
Email: [email protected]
Singapore Office
Address: 865 Mountbatten Road, Katong SC #05-43, Singapore 437844
Tel: + 65 6345 4908
Fax: + 65 6345 1186
Email: [email protected]
Thailand Office
Address: 3rd Floor, T. Shinawatra Building, 94 Sukhumvit Soi 23, Sukhumvit Road, Klongtoeynua,
Wattana, Bangkok 10110
Tel: [phone]
Fax: [phone]
Email: [email protected]
India Office
Address: Suit No. 202 Chintels Business Centre, A-11 Kailash Colony, New Delhi 110048, India
Tel: + 91 11 5173 9997 / 8
Fax: + 91 11 5173 9996
Email: [email protected]
Sweden Office
Address: Gustavslundsvagen 147, S- 167 51 Bromma, Stockholm, Sweden
Tel: [phone]
Fax: [phone]
Email: [email protected]
Brazil Sales Office
Address: Rua Gomes de Carvalho 1655 cj 101 / 102, 04547-006 Vila Olímpia, São Paulo, Brazil
Tel: [phone]
Fax: [phone]
Email: [email protected]
China Office
Address: Shenzhou Road, Guangzhou Science City, Guangzhou, China
Tel: + 86 20 2839 0000
Fax: + 86 20 2839 0136
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 may occur.
In order that any amendment/remedial action can be carried out promptly, it is necessary to fill out and
return 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

INSTALLATION GUIDE FOR SR-1910
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1 SR-1910 REPEATER INTRODUCTION
The SR-1910 GSM1900 Band Adjustable Repeater is used where small-scale signal coverage for city
structures is desired (e.g., hotels, department stores and shopping malls, underground parking lots and
tunnels, convention centers, arenas, airports, etc.)
The SR-1910 is designed for indoor operation in the GSM1900 band. The band-specific linear amplifier
amplifies the desired BTS band and IF filtering effectively provides superior out-of-band rejection.
Local and remote configuration and surveillance is possible through laptop by using Comba’s OMT/OMC
softwares. Internal Li-ion backup battery ensures alarm signals can be sent out in the event of power
failure.
The SR-1910 comes in a completely sealed, well-ventilated cast aluminum enclosure and is suitable for
indoor and sheltered outdoor environment.
Main Features
zDownlink output power options of 0.05W and 0.5W that provides extended indoor cell coverage.
zBand adjustable from 15M to 60M and customized 15M fixed bandwidth.
zAdjustable centre frequency within 60M of the 1900MHz frequency band.
zSuperior filtering and amplification designed for both uplink and downlink signals
zLow noise amplifier improves overall system noise figure for better voice quality and reduced drop call.
zCan be configured as Master Unit (MS) or Slave Unit (SU) in a centralized monitoring system.
zLocal / remote control and monitoring function: operating status and parameters can be set or
monitored by the OMT PC.
zOMC is available for remote operation and maintenance via an integrated wireless modem. (Optional)
zInternal back-up Li-ion battery keeps the equipment running for up to two hours in case of power
failure.
zThe enclosure is designed for indoor and sheltered outdoor environment – waterproof, damp-proof
and omni-sealed (IP55).
Two product variants exist with SR-1910 – please refer to the product label for the identifier code to confirm
exact product variant.
Identifier Code Main Features
SR-1910-C2 With integrated wireless modem. Function as Master or Slave Unit in
centralized monitoring system.
SR-1910-C1 Without integrated wireless modem. Function as Slave Unit in centralized
monitoring system.
Table 1: SR-1910 variants

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The following figure shows the enclosure of the SR-1910.
152
430
300
Figure 1: Front, side and bottom views of the SR-1910 enclosure
End of section

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2 EQUIPMENT DESCRIPTION
2.1 SR-1910 FUNCTIONAL BLOCK DIAGRAM
LNA1
LNA2
Service
ANT
Donor
ANT
Mobile
Power
Supply
Alarm
Indicator Main Control Unit
External
Power
OMT
Li-ion
BATT
Modem
DT MT
OMT
Computer with
Data card
Wireless
Modem
OMC
PA1
PA2
DL FS Module
ULFS Module
BTS
DPX1 DPX2
Figure 2: SR-1910 functional block diagram
In downlink, the BTS signals are received by donor antenna of the repeater. After the duplexer, the signals
are sent to the LNA for pre-amplification, followed by band filtering through the Frequency Selection (FS)
Module. The power amplifier (PA) will then amplify the band to the desired output power before entering the
duplexer to share a common service antenna with uplink signals path.
In uplink, the mobile signals are received by the service antenna. After the duplexer, the signals are sent to
the LNA, FS and PA modules. After combining with the downlink signals in the duplexer, the uplink signals
are sent to the donor antenna for transmission back to the BTS.
The FS and PA modules are usually integrated into one module called FSA module.

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2.2 GENERAL APPLICATIONS
Centralized Control and Monitoring
Centralized control and monitoring is applicable for indoor systems employing several indoor repeaters.
For remote control and monitoring, the operating status of each remotely connected slave repeater can be
monitored by the OMC through the Master Unit (with integrated wireless modem). The Master Unit is
locally connected with the Slave Unit via RS-485 communication bus. The communication between the
Master Unit and OMT / OMC is via SMS or datalink.
Figure 3: Centralized remote control and monitoring
For local control and monitoring, the Slave units are connected with the Master Unit via RS-485
communication bus, and the working status of each Slave Unit can be locally monitored through the Master
Unit.
Master Unit
Slave Unit 1
Communication BusEXT ALM 1
EXT ALM 1 EXT ALM 1 EXT ALM 1
Slave Unit 2 Slave Unit n
Modem
n≤32
OMT PC
Figure 4: Centralized local control and monitoring

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2.3 EQUIPMENT LAYOUT
Shown below is the internal layout of the SR-1910.
Integrated UL
Duplexer
Integrated DL
Duplexer
PSU
RF Integrated
Module
MCU
Li-ion Battery
Wireless
Modem
Figure 5: Layout of the SR-1910

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2.4 EQUIPMENT CONSTITUTION
The typical SR-1910 unit consists of the following components:
Integrated Duplexer (DPX): The DPX is located towards the DT and MT terminals and permits the uplink
and downlink signals to share a common antenna. The DL DPX is integrated with function of DL LNA to
pre-amplify signals; the UL DPX is integrated with functions of UL LNA.
•Low Noise Amplifier (LNA): With ATT function, it is installed at the front end of the UL and DL
branches. The use of LNAs provides better sensitivity to the repeater.
RF Integrated Module: Combines of Distribution Board, UL/DL FS module and UL/DL PA module.
•Frequency Selection Module (FS): IF SAW filtered and is used to select the required band and
effectively reject the undesired signals.
•Power Amplifier Module (PA): With the ATT and ALC functions, it fulfils power amplification in
both UL and DL branches.
•Distribution Board: It provides connectivity to the functional modules and connection between
the MCU and the LEDs located on the enclosure bottom.
Power Supply Unit (PSU): The PSU converts the input voltage into a stable DC to provide power for the
internal functional modules and to charge the internal Li-ion battery.
Wireless Modem: The wireless has connections for RF, data and power. On the wireless modem, there is
an indicator LED to show the modem status. The wireless modem is used for remote control and monitors,
and for alarm transmission from the equipment back to the OMC.
Li-ion Battery: The Li-ion battery provides back-up supply to the MCU to send out alarm signals in the
event of mains failure.
Main Control Unit (MCU): The MCU is used to monitor and control the operation of the repeater. It also
provides the communication interface for remote control and indication. LED indicators provide the
operation status of the MCU.
End of section

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3 INSTALLATION
3.1 WARNINGS AND ALERTS
Radio Frequency Energies
There may be situations, particularly for workplace environments near high-powered RF sources, where
recommended limits for safe exposure of human beings to RF energy could be exceeded. In such cases,
restrictive measures or actions may be necessary to ensure the safe use of RF energy.
High Voltage
The equipment has been designed and constructed to prevent, as far as reasonably, practicable danger.
Any work activity on or near equipment involving installation, operation or maintenance must be, as far as
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 from the equipment. It also covers activities that require the use of
force or effort, such as pulling a lever, or operating power tools.
Where some of the abovementioned activities are required, the equipment must be handled with care to
avoid being damaged
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 repeater is designed for indoor / sheltered outdoor installation and operation.
Installation Location
Mounting surface shall be capable of supporting the weight of the equipment.
In order to avoid electromagnetic interference, a proper mounting location must be selected to minimize
interference from electromagnetic sources such as large electrical equipment.
Environmental
Humidity has an adverse effect on the reliability of the equipment. It is recommended to install the
equipment in locations having stable temperature and unrestricted air-flow.
The installation location for the product should be well ventilated. The equipment has been designed to
operate at the temperature range and humidity level as stated in the product specifications in the
datasheet.
Direct sun light exposure to the equipment should be avoided. Provide additional shelter if necessary.
Power Supply
The power supply unit (PSU) provides power to all modules within the enclosure. The PSU accepts AC
mains voltage. 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 required. Where applicable, ensure
cables are properly routed and secured so that they are not damaged.
Manual Handling
During transportation and installation, take necessary handling precautions to avoid potential physical
injury to the installation personnel and the equipment.

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3.2.1 INSTALLATION CHECKLIST
•Working space available for installation and maintenance for each mounting arrangement. Ensure
unrestricted airflow.
•Ensure earthing point is within reach of the ground wire.
•Ensure a power source is within reach of the power cord. And the power source has sufficient capacity
(about 3.15A for AC).
•Where appropriate, ensure unused RF connectors are terminated.
•Do not locate the equipment near large transformers or motors that may cause electromagnetic
interference.
•Reduce signal loss in feeder cable by minimizing the length and number of RF connections.
•Ensure VSWR of antennas system < 1.5:1.
•Ensure equipment will be operated within the stated environment (see datasheet)
•Where needed, couple BTS RF signal with a coupler to prevent the equipment from damage.
•Observe handling of all cables to prevent damage.
•Donor antenna should have a narrow beamwidth and positioned in line of sight (LOS) to donor BTS site
so that the donor signal level is maximized. This allows the use of minimum gain to achieve the
maximum DL output power. The UL gain is typically set lower than or equal to the DL gain to minimize
noise interference to the donor BTS
•Service antenna should be selected based on the type of service area, e.g., indoor antenna for indoor
application, and panel antenna for outdoor application.