Comba Telecom RX-2620 User manual

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LT TE E W WI IR RE EL LE ES SS S R RE EP PE EA AT TE ER R 
USER MANUAL
RX-2620 QE: 1-0-0
Comba Telecom Ltd.
RX-2
6
2
0

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:
This is an unpublished work the copyright in which vests in Comba International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.

USER MANUAL FOR RX-2620
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0.1 CONTENTS
Section Page
0.1CONTENTS........................................................................................................................... 3
0.2INDEX TO FIGURES AND TABLES ..................................................................................... 4
0.3HISTORY............................................................................................................................... 5
0.4GLOSSARY OF TERMS ....................................................................................................... 6
0.5SAFETY NOTICES AND ADMONISHMENTS...................................................................... 7
1GENERAL INFORMATION ................................................................................................... 8
2EQUIPMENT DESCRIPTION.............................................................................................. 10
2.1SYSTEM DIAGRAM ............................................................................................................ 10
2.2EQUIPMENT LAYOUT........................................................................................................ 11
2.3EQUIPMENT CONSTITUTION ........................................................................................... 11
2.4KIT OF PARTS .................................................................................................................... 12
3INSTALLATION ................................................................................................................... 13
3.1WARNINGS AND ALERTS ................................................................................................. 13
3.2SITE PLANNING CONSIDERATIONS................................................................................ 14
3.3INSTALLATION PROCEDURES ........................................................................................ 15
3.3.1GOODS INWARDS INSPECTION ...................................................................................... 15
3.3.2TOOLS................................................................................................................................. 15
3.3.3PREPARATION...................................................................................................................15
3.3.4WALL MOUNTING .............................................................................................................. 16
3.3.5POLE MOUNTING OF MOUNTING RACK......................................................................... 17
3.3.6DRIP-LOOP......................................................................................................................... 17
3.4EQUIPMENT CONNECTORS ............................................................................................ 18
3.4.1CONNECTORS ...................................................................................................................18
3.4.2GROUNDING CONNECTION............................................................................................. 19
3.4.3LI-ION BATTERY CONNECTION ....................................................................................... 19
3.4.4RF CONNECTION............................................................................................................... 19
3.4.5EXTERNAL ALARM CONNECTION................................................................................... 19
3.4.6CONNECTION BETWEEN PC AND EQUIPMENT ............................................................ 20
3.4.7EXT ALARM CONNCETION............................................................................................... 20
4COMMISSIONING............................................................................................................... 21
4.1PRE-COMMISSIONING TASKS ......................................................................................... 21
4.2MCU LED INDICATORS ..................................................................................................... 21
4.3COMMISSIONING PROCEDURES .................................................................................... 22
5OMT..................................................................................................................................... 24
5.1LOCAL AND REMOTE CONNECTIONS TO OMT............................................................. 24
5.2OMT CONFIGURATION ..................................................................................................... 26
5.3RF PARAMETER ................................................................................................................ 26
5.3.1SWITCH...............................................................................................................................27
5.3.2ATT ...................................................................................................................................... 27
5.3.3ALARM THRESHOLD ......................................................................................................... 27
5.3.4ALARM INFORMATION ...................................................................................................... 28
5.4PROPERTIES INFO............................................................................................................ 29
5.4.1EQUIPMENT ID................................................................................................................... 29
5.4.2COMM. CONFIG .................................................................................................................29
6MAINTENANCE ..................................................................................................................31
7APPENDICES...................................................................................................................... 32
7.1APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE ................................. 32
7.2APPENDIX B: RMA (RETURN MATERIAL AUTHORIZATION) FORM ............................. 33

USER MANUAL FOR RX-2620
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0.2 INDEX TO FIGURES AND TABLES
Figure 1: Views of RX-2620 Enclosure.........................................................................................................9
Figure 2: RX-2620 System Diagram.......................................................................................................... 10
Figure 3: RX-2620 Internal Layout............................................................................................................. 11
Figure 4: Mounting Rack Overview............................................................................................................ 15
Figure 5: Wall Mounting ............................................................................................................................. 16
Figure 6: Pole Mounting Overview............................................................................................................. 17
Figure 7: Bottom Panel Interface Diagram ................................................................................................ 18
Figure 8: The Connection between Equipment and PC ............................................................................ 20
Figure 9: Pins Allocation for “EXT_ALM” Port ........................................................................................... 20
Figure 10: LEDs ......................................................................................................................................... 21
Figure 11: PC Protocol Setting .................................................................................................................. 24
Figure 12: Connection Type 1.................................................................................................................... 25
Figure 13: Connection Type 2.................................................................................................................... 25
Figure 14: Remote Connection .................................................................................................................. 26
Figure 15: OMT Main Window ................................................................................................................... 26
Figure 16: Switch ....................................................................................................................................... 27
Figure 17: ATT ........................................................................................................................................... 27
Figure 18: Alarm Threshold ....................................................................................................................... 28
Figure 19: Master Alarm ............................................................................................................................ 28
Figure 20: Channel Alarm .......................................................................................................................... 28
Figure 21: External Alarm .......................................................................................................................... 29
Figure 22: Equipment ID ............................................................................................................................ 29
Figure 23: Com. Config.............................................................................................................................. 30
Table 1: Equipment Constitution................................................................................................................ 11
Table 2: Equipment KOP ........................................................................................................................... 12
Table 3: Cable Connection ........................................................................................................................ 14
Table 4: RX-2620 Connectors ................................................................................................................... 18
Table 5: Pin Definition of “EXT_ALM” Port ................................................................................................ 20
Table 6: LED Indicators ............................................................................................................................. 21
Table 7: Commissioning ............................................................................................................................ 23
Table 8: IP Setting Quick Look-up Table ................................................................................................... 25
Table 9: Equipment ID ............................................................................................................................... 29
Table 10: Com. Config. .............................................................................................................................. 30

USER MANUAL FOR RX-2620
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0.3 HISTORY
Change No. ENU Details Of Change
1 1-0-0 RX-2620 user manual first created in Aug 2012 and referred to its
Chinese manual RX-2620-1001YH.

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0.4 GLOSSARY OF TERMS
ALC Automatic Level Control
ATT Attenuation
AFC Antenna Feedback Cancellation
BTS Base Transceiver Station
dB Decibel
dBm Decibels relative to 1 milliwatt
DL Downlink
DPX Duplexer
DT Donor Terminal
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
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
RX Receive
SMA Sub-Miniature “A” Connector
SIU Slide-In-Unit
TX Transmit
UL Uplink
VAC Volts Alternating Current
VSWR Voltage Standing Wave Ratio

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0.5 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.
CAUTION: danger of explosion if battery is incorrectly replaced. Replace only with the same or
equivalent type.
End of Section

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1 GENERAL INFORMATION
RX-2620 LTE Wireless Repeater (hereinafter called “RX-2620”) is designed for 2600MHz network. RX-
2620 adopts broadband digital processing technology and instant broadband reaches 60MHz.
Characteristics of RX-2620 are as follows:
•It supports FDD-LTE 2600MHz system.
•Digital channel bandwidth is settable with 10MHz, 15MHz and 20MHz.
•It satisfies the bandwidth selection by setting upper and lower band edge working channel.
•High out-of-band suppression can effectively suppress the out-of-band interference signal.
•Allows DL VSWR alarm, DL input field intensity detect and output power detect functions, easy for
installation.
•Automatic gain temperature compensation function which can maintain regular operation among
working temperature.
•It supports the remote download of monitoring master unit software.
•Local Operation and Maintenance Terminal (OMT): operating status and parameters can be set or
monitored by OMT PC locally. It can also check the downlink power and download the latest OMT
version.
•Operation Maintenance Center (OMC): system working parameters and communication configuration
can be set or inquired remotely through the build-in GSM modem. If alarm is generated, the
equipment will dial up to OMC automatically in the mode of SMS or GPRS.
•Build-in Li-ion battery ensures that alarm information can automatically report to OMC in case of
equipment power failure.
•Designed for all weather outdoor application – waterproof, damp-proof and Omni-sealed.

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The following figure shows the enclosure of the RX-2620.
420
330 182
Figure 1: Views of RX-2620 Enclosure
End of Section

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2 EQUIPMENT DESCRIPTION
2.1 SYSTEM DIAGRAM
LNA1
LNA2
Mobile
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 Frequency
Selective Module
UL Frequency
Selective Module
BTS
Figure 2: RX-2620 System Diagram
As shown in the above figure, the downlink BS signals go through DT port to the system and then to
downlink by duplexer separation. The DL signals will go through LNA then to digital RF monitoring
module for digital filtering and amplifying. After amplification, the signals are transmitted at the MT port to
the service antenna.
On the UL, the signals transmitted by the mobile go through MT integration duplexer and digital RF
monitoring module then to uplink PA to power amplify and filter via duplexer, finally get back to BS by
donor antenna.

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2.2 EQUIPMENT LAYOUT
The following figure shows RX-2620 internal layout.
Surge
Arrestor
Integrated
Module
PSU
DL PA UL PA
DT Duplexer MT Duplexer
Figure 3: RX-2620 Internal Layout
2.3 EQUIPMENT CONSTITUTION
RX-2620 consists of the modules described as below:
Table 1: Equipment Constitution
Identifier Functional Description
Power Supply Unit (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.
Power Amplifier (PA) Amplifies the UL/DL signal.
Surge Arrestor Is assumed that the antenna system will have ample lightning protection.
Integrated Module Consists of digital processing unit, RF unit and monitoring unit.
Duplexer Realizes UL/DL TX/RX isolation, build-in DL/UL LNA is used to amplify
the DL/UL low noise signal. Build-in VSWR module allows DL output
antenna port VSWR detect.

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2.4 KIT OF PARTS
For this system, the following are shipped:
Table 2: Equipment KOP
Product Identifier Description Quantity
RX-2620 manual This equipment manual on CD-Rom 1
CPC Connector X14J7P 1
Ethernet Cable 2m 1
Modem Antenna XD-WCDMA 1
Masonry Bolt M8x80 4
U Bolt (with 2 nuts, flat washer,
spring washer per bolt) M10x85x110 2
Power Supply Cable n/a 1
T-shape Pentagon Screw
Wrench 5mm 1
OMT V5.0 or above OMT software on CD-Rom 1
Factory Test Report N/A 1
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. 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 site considerations are listed below:
•The distance between the donor antenna and the BS should satisfy line of sight requirements for
maximum coverage area. The received spots accept field intensity at least -70dBm.
•Make sure that TX and RX antennas isolation should more than the max gain that of -15dB.
•Supply power near by the BS and easily access to the grounding spot.
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.
Chassis output interface should install higher 1.2m than the ground.
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 which should under the
temperature that of -33oC ~+55oC and relative humidity of maximal 95%.
The installation location for the product should be well ventilated. The equipment has been designed to
operate at the temperature range and humidity level as stated in the product specifications in the
datasheet.
Direct sun light exposure to the equipment should be avoided. Provide additional shelter if necessary.
Powering
The power supply unit (PSU) provides power to all modules within the equipment. Depending on the
product variant, it is recommended that the PSU operates on a dedicated circuit breaker or fused circuit.
Grounding Requirement
Verify that the equipment has been well grounded. This includes antennas and all cables connected to
the system. Ensure lightning protection for the antennas is properly grounded.
Cable Routing
Depending on equipment configuration, a variety of types of cables are required. Where applicable,
ensure cables are properly routed and secured so that they are not damaged.
Cable requirements are as follow:
Table 3: Cable Connection
able Connection Description
Coaxial Cable N to N Connect BS cable to DT port
Coaxial Cable N to N Connect serve antenna cable
to MT port
Local Commissioning Cable RJ45 Connect with PC to realize local
commissioning
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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3.3 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 courier. 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, please contact
Comba.
zDo not remove items from antistatic packing until ready for 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 the recommended tools required for installation and maintenance.
3.3.3 PREPARATION
zWall mounting with the masonry bolts supplied, which make use of the outer holes.
zPole Mounting with the clamp kit supplied, which make use of the inner holes.
236
186
200
Figure 4: Mounting Rack Overview

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3.3.4 WALL MOUNTING
zDrill holes on the wall by using the position of the four round holes on the Mounting rack as a guide.
zInsert the masonry bolts through the round holes and tighten them to take the weight of the entire
enclosure.
zHook the enclosure up onto the mounting rack and align the hole positions to that of the mounting
rack, then installed the hex socket bolt to complete the installation.
M8 Masonry Bolt
Mounting Rack
M8 Hex Socket Bolt
Figure 5: Wall Mounting

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3.3.5 POLE MOUNTING OF MOUNTING RACK
zThe equipment can be mounted on a pole of about 60~75mm in diameter.
zInsert and tighten the two U bolts to secure the mounting rack onto the pole.
zThe remaining installation to secure the enclosure to the mounting rack is identical to wall mounting.
U Bolt
Pole
Mounting Rack
M8 Hex Socket Bolt
Figure 6: Pole Mounting Overview
3.3.6 DRIP-LOOP
Comba recommends that every horizontal cable entry to the equipment forms a 'U' before its entry to the
equipment. Water on the cable will drip down at the bottom of the loop and will not accumulate at the
equipment connectors.

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3.4 EQUIPMENT CONNECTORS
3.4.1 CONNECTORS
.
EXT_ALM MODEM
POWER
DT MT
Figure 7: Bottom Panel Interface Diagram
The connection interfaces are shown below:
Table 4: RX-2620 Connectors
Connector Description
MT N-female connector, for external mobile antenna
DT N-female connector, for external donor antenna
EXT_ALM 7-pin CPC connector for external alarm interface.
POWER1Power supply interface
MODEM ANT SMA-F connector connects with external antenna.
1The voltage identification is a variant due to electricity system diversity of global regions. The power cable gland
might be identified for AC 220V, AC 110V, AC 220V/110V, DC -48V, or DC +24V respectively. Please refer to
specific product or contact local sales if any doubt.

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3.4.2 GROUNDING CONNECTION
Ground Connection
To ensure safe operation of the product, a ground (earth) connection is required. For single phase AC
power source, the product must be grounded by connecting the “earth wire” of the power cord to the
ground terminal of the AC supply.
3.4.3 LI-ION BATTERY CONNECTION
Li-ion battery which located in the side panel of enclosure is provided with this system to ensure power is
supplied to the system integrated module and MCU and connect the connectors as illustrated below after
system commissioning to ensure the alarm message could be sent to OMC effectively in case of mains
power failure.
Caution: Be careful of the risk of explosion if battery is replaced by an incorrect type. Dispose of used
batteries according to the instructions.
3.4.4 RF CONNECTION
zDonor antenna connection: Connect the cable form donor antenna to DT port
zMobile antenna connection: Connect the cable form mobile antenna to MT port
3.4.5 EXTERNAL ALARM CONNECTION
The external alarm port is used to connect with other external equipment and alarm ports. Connection is
not must in case there is no external alarm port.

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3.4.6 CONNECTION BETWEEN PC AND EQUIPMENT
The below shows the connection:
Figure 8: The Connection between Equipment and PC
Note that when connect the RJ45 Ethernet cable with PC, the equipment should be power off and Li-ion
battery output connector is disconnected.
3.4.7 EXT ALARM CONNCETION
The EXT ALARM port is a 7-pin CPC connector. The following figure and table show the pin allocation
and definition. Pin numbering are shown looking-into the connector on the enclosure.
21
67
35
4
Figure 9: Pins Allocation for “EXT_ALM” Port
Table 5: Pin Definition of “EXT_ALM” Port
Pin
number 1 2 3 4 5 6 7
Alarm
definition
EXT.
Alarm 1
EXT.
Alarm 2 Reserved GND Reserved Reserved Reserved
End of Section