FCC ID: PX8RXB37 700MHz/800MHz Public Safety Bi-directional Amplifier

CriticalPoint Public Safety BDA DIGITAL BAND SELECTIVE REPEATER USER MANUAL RXA3748/RXA3792 RXB3748/RXB3792 QE: 1-0-0 _ _ _ __ _ _ _ _ CriticalPoint PUBLIC SAFETY BI-

DIRECTIONAL AMPLIFIER USER MANUAL RXA3748/RXA3792 RXB3748/RXB3792 QE: 1-0-0 Comba Telecom Ltd. INSTALLATION GUIDE FOR RX-7W22, II2 The information contained herein is the responsibility of and is approved by the following, to whom all enquiries should be directed:

This is an unpublished work the copyright in which vests in Comba International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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 3 1.1 1.2 1.3 1.4 1.5 1 2 2.1 2.2 2.3 3 3.1 3.2 3.2.1 3.2.2 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.4 3.4.1 3.4.2 3.4.3 3.4.4 3.4.5 3.4.6 4 4.1 4.2 5 5.1 5.2 5.2.1 5.2.2 5.2.3 5.3 6 7 7.1 7.2 7.3 INSTALLATION GUIDE FOR RX-7W22, II2 0.1 CONTENTS Section Page CONTENTS ....................................................................................................................................... 4 INDEX TO FIGURES AND TABLES ............................................................................................. 6 HISTORY ........................................................................................................................................... 7 GLOSSARY OF TERMS ................................................................................................................. 8 SAFETY NOTICES AND ADMONISHMENTS............................................................................. 9 GENERAL INFORMATION ........................................................................................................... 10 EQUIPMENT DESCRIPTION ....................................................................................................... 14 FUNCTIONAL BLOCK DIAGRAM ............................................................................................... 14 EQUIPMENT LAYOUT .................................................................................................................. 15 EQUIPMENT CONSTITUTION .................................................................................................... 16 INSTALLATION .............................................................................................................................. 17 WARNINGS AND ALERTS ........................................................................................................... 17 SITE PLANNING CONSIDERATIONS ....................................................................................... 18 SITE PLANNING ............................................................................................................................ 18 INSTALLATION CHECKLIST ....................................................................................................... 19 INSTALLATION PROCEDURES ................................................................................................. 20 GOODS INWARDS INSPECTION ............................................................................................... 20 TOOLS ............................................................................................................................................. 20 PREPARATION .............................................................................................................................. 20 WALL MOUNTING ......................................................................................................................... 21 DRIP-LOOP ..................................................................................................................................... 21 EQUIPMENT CONNECTORS...................................................................................................... 22 PS BDA CONNECTORS ............................................................................................................... 22 PS BDA LED INDICATORS .......................................................................................................... 23 GROUNDING CONNECTION ...................................................................................................... 23 RF CABLE CONNECTION ........................................................................................................... 23 ETHERNET CONNECTION ......................................................................................................... 23 DRY CONTACT CABLE CONNECTION .................................................................................... 24 COMMISSIONING ......................................................................................................................... 25 PRE-COMMISSIONING TASKS .................................................................................................. 25 COMMISSIONING PROCEDURE ............................................................................................... 26 WEB GUI ......................................................................................................................................... 28 WEB GUI CONNECTION ............................................................................................................. 28 WEB GUI INTRODUCTION .......................................................................................................... 29

[HOME] ............................................................................................................................................ 29

[COMMISSIONING] ....................................................................................................................... 31

[MANAGEMENT] ............................................................................................................................ 31 COMMISSIONING PROCEDURE ............................................................................................... 38 MAINTENANCE .............................................................................................................................. 41 APPENDICES ................................................................................................................................. 42 APPENDIX A ................................................................................................................................... 42 APPENDIX B: TOOLS ................................................................................................................... 44 APPENDIX C: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT ................ 45 ENU STATUS : 1-0-0 Copyright - refer to title page Page 4 7.4 7.5 7.6 INSTALLATION GUIDE FOR RX-7W22, II2 APPENDIX D: TROUBLESHOOTING QUICK GUIDE ............................................................. 46 APPENDIX E: DEVICE REPORT EXAMPLE ............................................................................ 49 APPENDIX F: RMA (RETURN MATERIAL AUTHORIZATION) ............................................. 50 ENU STATUS : 1-0-0 Copyright - refer to title page Page 5 INSTALLATION GUIDE FOR RX-7W22, II2 1.2 INDEX TO FIGURES AND TABLES Figure 1: Front, Side and Bottom Views of the PS BDA Enclosure .................................................................. 10 Figure 2: PS BDA Functional Block Diagram.................................................................................................... 14 Figure 3: Layout of the PS BDA ........................................................................................................................ 15 Figure 4: Mounting Rack Overview ................................................................................................................... 20 Figure 5: PS BDA Wall Mounting ..................................................................................................................... 21 Figure 6: Equipment Connectors ...................................................................................................................... 22 Figure 7: Commissioning Procedure ................................................................................................................ 26 Figure 8: Input IP Address ................................................................................................................................ 28 Figure 9: Input Domain Name .......................................................................................................................... 28 Figure 10: Input User Name and Password ...................................................................................................... 28 Figure 11: Web GUI Main Screen ..................................................................................................................... 29 Figure 12: Overview Screen ............................................................................................................................. 29 Figure 13: Device Alarm Screen ....................................................................................................................... 30 Figure 14: 800MHz Screen ............................................................................................................................... 30 Figure 15: Commissioning Screen .................................................................................................................... 31 Figure 16: Management Screen ...................................................................................................................... 31 Figure 17: Management Device Info.............................................................................................................. 32 Figure 18: Management Comm. Setting ........................................................................................................ 32 Figure 19: Management-Alarm Setting ............................................................................................................. 33 Figure 20: Management-Alarm Setting ............................................................................................................. 33 Figure 21: Management Isolation .................................................................................................................. 34 Figure 22: Management Reset ...................................................................................................................... 34 Figure 23: Management Report ..................................................................................................................... 35 Figure 24: Management Report ..................................................................................................................... 35 Figure 25: Management Log.......................................................................................................................... 36 Figure 26: Management License ................................................................................................................... 36 Figure 27: Management Security................................................................................................................... 37 Figure 28: Commissioning Procedure Start ................................................................................................... 38 Figure 29: Commissioning Procedure Site Info. Setting ................................................................................ 38 Figure 30: Commissioning Procedure Isolation Detection ............................................................................. 39 Figure 31: Commissioning Procedure Isolation Detection Confirm ............................................................... 39 Figure 32: Commissioning Procedure Finish ................................................................................................. 40 Figure 33: Alarm list .......................................................................................................................................... 46 Figure 34: Reset PA ......................................................................................................................................... 47 Table 1: Equipment Connectors ....................................................................................................................... 22 Table 2: LED Indicators .................................................................................................................................... 23 Table 3: Pin Definition of Dry Contact Cable .................................................................................................... 24 Table 4: Commissioning Task Explanation ....................................................................................................... 27 ENU STATUS : 1-0-0 Copyright - refer to title page Page 6 1.3 HISTORY INSTALLATION GUIDE FOR RX-7W22, II2 Change No. Details Of Change ENU 1-0-0 1 This manual first created and issued in May. 2020. ENU STATUS : 1-0-0 Copyright - refer to title page Page 7 INSTALLATION GUIDE FOR RX-7W22, II2 1.4 GLOSSARY OF TERMS Abbreviation Definition ALC Automatic Level Control ATT BTS CH CSA dB dBm DL DT DPX FS Hz ID IF LNA LOS MCU MHz MT MTBF NF OMC OMT PA PLL PSU RF SMA UL VAC VDC VSWR Attenuator Base Transceiver Station Channel Cross Sectional Area Decibel Decibels relative to 1 milliwatt Downlink Donor Terminal Duplexer Frequency Selection Hertz Identification Intermediate Frequency Low Noise Amplifier Line-of-Sight Main Control Unit Megahertz Mobile Terminal Mean Time Between Failures Noise Figure Operation & Maintenance Center Operation & Maintenance Terminal Power Amplifier Phase Locked Loop Power Supply Unit Radio Frequency Sub-Miniature A Connector Uplink Volts Alternating Current Volts Direct Current Voltage Standing Wave Ratio ENU STATUS : 1-0-0 Copyright - refer to title page Page 8 INSTALLATION GUIDE FOR RX-7W22, II2 1.5 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 colored 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. Note: The grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. Such modifications could void the users authority to operate the equipment. For compliance with the general population RF exposure limits, each individual antenna used for this transmitter must be installed to provide a separation distance greater than 31.2cm or more from all persons during normal operation and must not be co-located with any other antenna for meeting RF exposure requirements. 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. WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express consent of an FCC Licensee to operate this device. The PS BDA can be configured as Class A ( FCC ID: PX8RXA37) or Class B (FCC ID:PX8RXB37) Signal Booster. You MUST register Class B signal boosters (as defined in 47 CFR 90.219) online at www.fcc.gov/signal-boosters/registration. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation. Note: The grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. Such modifications could void the users authority to operate the equipment. 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. Disconnection of the 2 RF connectors may cause damage to the equipment when power is on The application antenna and RF cable are not provided. FCC regulation mandate that the ERP of type B signal boosters should not exceed 5W, this booster has a maximum programmable composite output power of 5W(37dBm) for Downlink, 1W(30dBm) for uplink. Therefore, the gain of the antenna should be of 0dBi or less. ENU STATUS : 1-0-0 Copyright - refer to title page Page 9 WARNING!

INSTALLATION GUIDE FOR RX-7W22, II2 Use only authorized and approved antennas, cables and/or coupling devices! The use of unapproved antennas, cables or coupling devices could cause damage and may be of violation of FCC regulations. The use of unapproved antennas, cables and/or coupling devices is illegal under FCC regulations and may subject the user to fine. End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 10 INSTALLATION GUIDE FOR RX-7W22, II2 1 GENERAL INFORMATION The RXA3748/RXA3792 (Class A), RXB3748/RXB3792 (Class B) is a new digital dual band public safety repeater (hereafter referred to as PS BDA) designed to protect the lives of first responders and building occupants. Through the use of digital filtering technology, the RX-7W22 helps eliminate adjacent channel interference to allow band selectivity and support 700MHz and 800MHz rebanding. Up to two non-contiguous frequency bands can be simultaneously supported in each of the 700MHz and 800MHz Public Safety frequencies via a web-based GUI, which provides versatility and total control to the user. Main Features PS 700MHz and 800MHz. Class A BDA, 32 channels per band or Class B BDA, 3 sub-bands. Channel selective or Band selective, software programmable. Auto diagnostic. Uplink squelch, per channel for Class A only. User adjustable gain control (AGC), UL and DL independent per channel. 700MHz and 800MHz band compatible, software adjustable. Built in isolation testing (mandatory prior to commissioning the PS BDA). Easy commission and setup via Web-based GUI, and SNMP supported Weatherproof enclosure, IP65/NEMA4. Fully compliant with the 2016 NFPA 72 Code. Competitive size and weight. Alarming output to supervised circuits for: antenna failure, signal booster failure, and etc. The following figure shows the enclosure of the PS BDA. Figure 1: Front, Side and Bottom Views of the PS BDA Enclosure ENU STATUS : 1-0-0 Copyright - refer to title page Page 11 INSTALLATION GUIDE FOR RX-7W22, II2 Bandwidth:

12.5KHz Bandwidth: 25KHz Bandwidth:

12.5KHz 60 @ filter center +

60 @ filter center +

Bandwidth: 25KHz dBc Bandwidth: 100KHz 60 @ filter center +

60 @ filter center +

60 @ filter center +

60 @ filter center +

Specifications-Class A (FCC ID:PX8RXA37) Electrical Frequency Range, Uplink Frequency Range, Downlink Channel Bandwidth Number of Channels Total Output Power, Uplink Total Output Power, Downlink Maximum System Gain Gain Adjustment Range (1dB step) Pass Band Ripple, p-p Uplink Noise Figure System Group Delay Out-of-Band Suppression Intermodulation Spurious Input VSWR Impedance Mechanical Dimensions, H x W x D Weight (without bracket) Power Supply Power Consumption Enclosure Cooling RF Connectors Test Port Operating Temperature Operating Humidity Environmental Class Single band Dual band MHz MHz KHz dBm dBm dB dB dB dB sec dBm dBm dBm dBm dBm in(mm) lb(kg) VAC VDC W W 700MHz 799-805 769-775 800MHz 806-817 851-862 12.5/25/100 12.5/25/100 30 32 37 100 0-30 5 5 35 25 75KHz 75KHz 200KHz

-13

-10

-20 1.5 50 32 37 100 0-30 5 5 35 35 75KHz 75KHz 200KHz

-13

-10

-20 1.5 50 22.4 x 15.4 x 9.0 (570 x 390 x 228) 66.2 (30) 100-240/47-63Hz

-40 ~ -58 120 200 Convection N-Female SMA, -27dB 95%

NEMA 4 Note: Typical specifications at room temperature, 9kHz to 1GHz 1GHz to 12.75GHz Maximum RF Input Power without Damage Maximum RF Input Power without Overdrive FCC Compliance FCC Compliance Maximum Input for Dry Contact Port 24VDC, 1A / 110VAC, 0.5A oF ( oC)

-27 to +140 (-33 to +60) ENU STATUS : 1-0-0 Copyright - refer to title page Page 12 INSTALLATION GUIDE FOR RX-7W22, II2 Specifications-Class B (FCC ID: PX8RXB37) Electrical Frequency Range, Uplink Frequency Range, Downlink Operating Bandwidth Number of Sub Bands Total Output Power, Uplink Total Output Power, Downlink Maximum System Gain Gain Adjustment Range (1dB step) Pass Band Ripple, p-p Uplink Noise Figure System Group Delay Out-of-Band Suppression Intermodulation Spurious 9kHz to 1GHz 1GHz to 12.75GHz Maximum RF Input Power without Damage Maximum RF Input Power without Overdrive Input VSWR Impedance Mechanical Dimensions, H x W x D Weight (without bracket) Power Supply Power Consumption Enclosure Cooling RF Connectors Test Port Operating Temperature Operating Humidity Environmental Class Single band Dual band Maximum Input for Dry Contact Port MHz MHz MHz dBm dBm dB dB dB dB sec dBc dBm dBm dBm dBm dBm in(m m) lb(kg) VAC VDC W W oF

( oC) 700MHz 788-798,799-805 758-768,769-775 30 0.2-10 3 37 100 0-30 5 5 6.5 0.6MHz 1MHz

-13

-10

-20 1.5 50 800MHz 806-816 851-861 0.2-10 3 37 100 0-30 5 5 6.5 0.6MHz 1MHz

-13

-10

-20 1.5 50 45 @ filter edge +

45 @ filter edge +

60 @ filter edge +

60 @ filter edge +

FCC Compliance FCC Compliance 22.4 x 15.4 x 9.0 (570 x 390 x 228) 66.2 (30) 100-240/47-63Hz

-40 ~ -58 120 200 Convection N-Female SMA, -27dB 24VDC, 1A / 110VAC, 0.5A

-27 to +140 (-33 to +55) 95%

NEMA 4 Note: Typical specifications at room temperature, ENU STATUS : 1-0-0 Copyright - refer to title page Page 13 INSTALLATION GUIDE FOR RX-7W22, II2 The rated output power of this equipment is for single carrier operation. For situation when multiple carrier signals are present, the rating would have to be reduced by 3.5dB, especially where the output signal is re-

radiated and can cause interference to adjacent band users. This power reduction is to be by means of input power or gain reduction and not by an attenuator at the output of the device. ENU STATUS : 1-0-0 Copyright - refer to title page Page 14 INSTALLATION GUIDE FOR RX-7W22, II2 2 EQUIPMENT DESCRIPTION 2.1 FUNCTIONAL BLOCK DIAGRAM RX TX 800DL 700DL Master Di gital Boar d 30.72MHz 12.8MHz PLL1 UL_PA AMP 2 AMP DL_LNA AMP DAC 20dB ADC 800UL FPGA ADC RX_1 30d B 1 AMP UL_LNA TX_1 DAC AMP AMP DL_PA TX_2 RX_2 TX_2 RX_2 AD9370_1 MCU RTC 32.768MHz AD9370_0 FB ORX1 30.72MHz 12.8MHz 30.72MHz 12.8MHz PLL3 Slave Digital Board DAC 20dB ADC 30dB 700UL FPGA 700DL MCU PLL4 AD9370_1 25MHz RTC 32.768MHz AD9370_0 30.72MHz 12.8MHz ADC A TT DAC RX_ 1 30d B TX_ 1 A TT 10dB Figure 2: PS BDA Functional Block Diagram DL_LNA AMP AMP AMP DL_PA

3 0 d B FB FS

-30dB RX TX TX 700&800UL MT 800DL 700DL In the downlink path, the BTS signals are received by the donor antenna of the repeater. After the duplexer, the signals are sent to the LNA module for pre-amplification and to the digital RF integrated module for digital filtering and frequency conversion. Then the DL signals will be sent to the downlink PA to amplify power, and filter via the duplexer. After amplification, the signals are transmitted at the MT port to the service antenna. In the uplink path, the mobile signals are received by the service antenna. After the MT port integrated duplexer, the signals are sent to the LNA, integrated module for digital filtering, then to the PA for power amplification and to the duplexer. After that, the uplink signals are sent to the donor antenna for transmission back to the BTS. ENU STATUS : 1-0-0 Copyright - refer to title page Page 15 INSTALLATION GUIDE FOR RX-7W22, II2 2.2 EQUIPMENT LAYOUT Shown below is the internal layout of the PS BDA. 800MHz Integrative Module Duplexer Master Digital Board Duplexer Power Supply Unit Slave Digital Board 700MHz Integrative Module Figure 3: Layout of the PS BDA ENU STATUS : 1-0-0 Copyright - refer to title page Page 16 INSTALLATION GUIDE FOR RX-7W22, II2 2.3 EQUIPMENT CONSTITUTION The typical PS BDA unit consists of the following components:

Master Digital Board and Slave Digital Board: The MCU is used to monitor and control the operation of the repeater. It also provides the communication interface for remote control and status indication. LED indicators provide the operation status of the MCU. Duplexer: The DPX is located near the MT and DT terminals and permits the uplink and downlink signals to share a common antenna. 700MHz /800MHz Digital Integrated Module and Power Amplifier: Consists of the Power Conversion module, RF module, digital process module and monitoring modules. The Power Conversion module converts

+28V DC voltage into +9VJK and +9VRF. +9VJK, +9VRF are supplied to the monitoring unit, and the RF unit in the integrated module separately. The RF module amplifies and converts the RF signal to IF signal. The Digital process module converts the IF signal into baseband signal via AD conversion and extraction, and filtering. After that, the IF signal will be amplified and converted to an RF signal by the RF module for RF filtering and amplification. The Monitoring module monitors and controls the system parameters and is the interface for both remote monitoring and local commissioning. Power Supply Unit (PSU): The PSU converts the input voltage into a stable DC supply to provide power for the internal functional modules. ENU STATUS : 1-0-0 Copyright - refer to title page Page 17 INSTALLATION GUIDE FOR RX-7W22, II2 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 reasonable, 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. Equipment provided for the purpose of protecting individuals from electrical risk must be suitable for the purpose and properly maintained and used. Protective Earthing 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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 18 INSTALLATION GUIDE FOR RX-7W22, II2 3.2 SITE PLANNING CONSIDERATIONS 3.2.1 SITE PLANNING Site Considerations Outdoor equipment is designed to be waterproof, rainproof, and with snow protection. Temporary protection should be taken when the equipment enclosure 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 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 Grounding Requirement Cable Routing Manual Handling The power supply unit (PSU) provides power to all modules within the equipment. Depending on the product variant, it is recommended that the PSU be operated on a dedicated circuit breaker or fused circuit. 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. 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. During transportation and installation, take necessary handling precautions to avoid potential physical injury to the installation personnel and the equipment. ENU STATUS : 1-0-0 Copyright - refer to title page Page 19 INSTALLATION GUIDE FOR RX-7W22, II2 3.2.2 INSTALLATION CHECKLIST Working space available for installation and maintenance for each mounting arrangement. Ensure unrestricted airflow. Ensure earth ground 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. 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) Observe handling of all cables to prevent damage. Donor antenna should have a narrow beamwidth and positioned in line-of-sight (LOS) to the 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 antennas should be selected based on the type of service area, e.g., indoor antenna for indoor application, and panel antenna for outdoor application. ENU STATUS : 1-0-0 Copyright - refer to title page Page 20 INSTALLATION GUIDE FOR RX-7W22, II2 3.3 INSTALLATION PROCEDURES 3.3.1 GOODS INWARDS INSPECTION Verify the number of packages received against the packing list. Check 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 during transit is the responsibility of the agent. Open and check each package against the packing list. If any items are missing, contact Comba. Do not remove items from anti-static packing until ready for installation. If damage is discovered at the time of installation, contact the shipping agent. See Appendix A for a full list of the recommended tools required for installation and routine maintenance. 3.3.2 TOOLS 3.3.3 PREPARATION Wall mounting with the masonry bolts supplied, which make use of the outer holes. Figure 4: Mounting Rack Overview ENU STATUS : 1-0-0 Copyright - refer to title page Page 21 INSTALLATION GUIDE FOR RX-7W22, II2 3.3.4 WALL MOUNTING Drill four holes on the wall using the position of four holes on the mounting rack as a guide. Fix the mounting rack to the wall using four masonry bolts (M10x110mm). Install the Mounting Rack to the wall. Hang the equipment and secure the enclosure to the mounting rack. Mounting Rack Masonry bolt 4-M10x110 6-M8x25, Hex socket with washer bolt RX-7W22 Figure 5: PS BDA Wall Mounting 3.3.5 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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 22 INSTALLATION GUIDE FOR RX-7W22, II2 3.4 EQUIPMENT CONNECTORS 3.4.1 PS BDA CONNECTORS The PS BDA is designed for all cable entries from the right or left of the enclosure, as shown in the following figure. Figure 6: Equipment Connectors Table 1: Equipment Connectors Identifier Descriptions Power

(Knock Out) DT Test MT Test Power cable connector for a pre-installed power cord for connection to DC

(e.g. DC -48V, Max. current is 8A) SMA connector for DT port test, -27dB coupling to DT port, available for both downlink and uplink test. SMA connector for MT port test, -27dB coupling to MT port, available for both downlink and uplink test. DT MT OMT LAN N-Female connector for connection to donor antenna. N-Female connector for connection to service antenna. RJ45 Connector for local WEB GUI connection. RJ45 Connector for internet connection. ENU STATUS : 1-0-0 Copyright - refer to title page Page 23 INSTALLATION GUIDE FOR RX-7W22, II2 3.4.2 PS BDA LED INDICATORS The LED indicators help user to check the equipment status easily. Table 2: LED Indicators Identifier Colour Indication PWR RUN ALM Green Power indicator. ON = power on; OFF = power off. Green Operation indicator, flashes every second to indicate normal operation. Red Alarm indicator. ON = alarm; OFF = no alarm. 3.4.3 GROUNDING CONNECTION Ground Connection To ensure safe operation of the product, a ground (earth) connection is required. For single phase AC power source, the product must be grounded by connecting the earth wire of the power cord to the ground terminal of the AC supply. For operating this product with DC power system (such as rectifiers), the product should not be connected to power systems that switch open the return lead because the return lead could function as the ground (earth) connection for the equipment. Protective Ground Connection The enclosure must be grounded securely by connecting a copper wire (CSA 16mm2) to the grounding terminal on the equipment/rack, and the other end to a protective ground (i.e. building earth point). An internationally acceptable color code of the ground connection wire is green/yellow. Such a ground connection implements the Protective Ground Connection, and must be connected to the equipment at the designated ground point. In general, do not connect the supply before establishing an adequate ground (earth) connection. Construct the ground wire, and use appropriate crimp connectors where necessary. Locate and connect the equipment grounding terminal to a protective ground (i.e. building earth point). 3.4.4 RF CABLE CONNECTION Single band PS BDA RF cables connection is as follows:

PS BDA MT port Connects to the feeder cable from service antennas. PS BDA DT port Connects to the feeder cable from donor antennas. 3.4.5 ETHERNET CONNECTION Connect Ethernet with LAN port in the panel. ENU STATUS : 1-0-0 Copyright - refer to title page Page 24 INSTALLATION GUIDE FOR RX-7W22, II2 3.4.6 DRY CONTACT CABLE CONNECTION Below please find the pin definitions of dry contact cables. Table 3: Pin Definition of Dry Contact Cable Pin NO. Pin ALM1 CLOSE1 COM1 OPEN1 CLOSE2 COM2 OPEN2 RR_A RR_B NC GND CLOSE3 COM3 OPEN3 CLOSE4 COM4 OPEN4 GND NC NC NC EXT ALM0 EXT ALM1 EXT ALM2 EXT ALM3 EXT Li+

EXT Li+

NC GND EXT Li-

EXT Li-

Input 1(A) 2(B) 3(C) 4(D) 5(E) 6(F) 7(G) 8(H) 9(J) 10(K) 1(A) 2(B) 3(C) 4(D) 5(E) 6(F) 7(G) 8(H) 9(J) 10(K) 1(A) 2(B) 3(C) 4(D) 5(E) 6(F) 7(G) 8(H) 9(J) 10(K) ALM2 AUX End of Section Output Red White Blue Black Brown Purple Green Orange Yellow Grey Red White Blue Black Brown Purple Green Orange Yellow Grey Red White Blue Black Brown Purple Green Orange Yellow Grey 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 ENU STATUS : 1-0-0 Copyright - refer to title page Page 25 INSTALLATION GUIDE FOR RX-7W22, II2 4 COMMISSIONING 4.1 PRE-COMMISSIONING TASKS After equipment installation, perform the following steps before equipment powering and commissioning:

Verify that the expected voltage, current and power levels do not violate any ratings. Visually inspect the power connection within the equipment. Ensure that the power cable is correctly and securely connected, including the grounding wire, RF cable and other cables. Check the grounding connection and verify that the ground resistance is less than 5. Test the antenna system and ensure that the echo loss within working frequency is less than -14dB

(VSWR<1.5). ENU STATUS : 1-0-0 Copyright - refer to title page Page 26 INSTALLATION GUIDE FOR RX-7W22, II2 4.2 COMMISSIONING PROCEDURE Perform the following procedures for system commissioning. Start commissioning guide in WEB GUI Set unit parameters Isolation detection Set Control channel frequency Input power detection from control channel Set channel total numbers Get the recommended DL and UL parameters Set frequency and gain for each channel in Device page, and turn on RF switches Fine tuning DL/UL gains for channels End Figure 7: Commissioning Procedure ENU STATUS : 1-0-0 Copyright - refer to title page Page 27 INSTALLATION GUIDE FOR RX-7W22, II2 Table 4: Commissioning Task Explanation Commissioning Tasks Observation 1. Isolation detection Detect isolation of service antenna and donor antenna. 2. Set control channel frequencies Enter the center frequency of the main control channel, the commissioning guide will provide recommended DL/UL gain settings based on main control channel input power and the total channel numbers. Users can skip this step and directly finish the commissioning guide even if the frequency information or the total channel numbers are unknown. Users can set the DL/UL gain manually any time after the isolation detection has been completed and passed. 3. Set Channel No. Enter the total channel numbers 4. Recommended DL and UL gain parameters The commissioning guide will provide recommended DL/UL gain settings. Users will still need to set all the gains manually in the Device pages, and the frequencies for all the independent channels in the same Device pages after the commissioning process is finished. End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 28 INSTALLATION GUIDE FOR RX-7W22, II2 5 WEB GUI The PS BDA can be monitored and controlled via the WEB GUI; use the following guide to finish system parameter setting and commissioning. 5.1 WEB GUI CONNECTION Step 1: Connect the OMT port to the PC RJ45 port with the supplied RJ45 cable to set up a physical connection. Step 2: Open a browser (browser IE7.0, IE8.0, Chrome or Firefox, suggested display resolution is 1024768), input Web GUI IP address: 192.168.8.101, click [Enter]. NOTE: DHCP and DNS are also available to login to the Web GUI. The domain name is: www.combaomt.com. Figure 8: Input IP Address Step 3: Input User Name: admin; Password (default password: admin). Click [Log in]. Figure 9: Input Domain Name Figure 10: Input User Name and Password ENU STATUS : 1-0-0 Copyright - refer to title page Page 29 INSTALLATION GUIDE FOR RX-7W22, II2 5.2 WEB GUI INTRODUCTION After log in, the Web GUI main screen will appear. Figure 11: Web GUI Main Screen On Comba Web GUI Home Screen, there are three Menu bars:

[Home], [Commissioning], and [Management]. 5.2.1 [HOME]

The [Home] Screen shows the equipment status, such as RF Switch status, PA status, alarm information, etc. Overview Figure 12: Overview Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 30 INSTALLATION GUIDE FOR RX-7W22, II2 Device Alarm This screen shows the alarm status. Figure 13: Device Alarm Screen 800MHz/700MHz This screen is available for PS BDA to adjust the center frequency and the bandwidth. Figure 14: 800MHz Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 31 INSTALLATION GUIDE FOR RX-7W22, II2 5.2.2

[COMMISSIONING]

A work flow of the commissioning process is shown on [Commissioning] Screen. Click the [Start] button, the software will guide you through the commissioning step by step. For details, please refer to chapter 5.3. Figure 15: Commissioning Screen 5.2.3 [MANAGEMENT]

Other parameters can be configured on the [Management] Screen. It includes Device Info, Comm. Setting, Alarm Setting, Isolation, Reset, Firmware, Report, Log, License and Security. Figure 16: Management Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 32 INSTALLATION GUIDE FOR RX-7W22, II2 Device Info Figure 17: Management Device Info Comm. Setting Note: There are 2 available communication types: SNMP and ETHERNET. You can choose a suitable type for remote monitoring. Figure 18: Management Comm. Setting ENU STATUS : 1-0-0 Copyright - refer to title page Page 33 INSTALLATION GUIDE FOR RX-7W22, II2 Alarm Setting Figure 19: Management-Alarm Setting Dry Contact Alarm and Ext Alarm can be set to show the target alarm accoridng to the Pre-set. The setting can be done by clicking Modify. Figure 20: Management-Alarm Setting ENU STATUS : 1-0-0 Copyright - refer to title page Page 34 INSTALLATION GUIDE FOR RX-7W22, II2 Isolation There are two ways to detect the isolation, manually or Automatic by ICS function. Figure 21: Management Isolation Reset Figure 22: Management Reset Note: Click Restore, all the parameters and alarms will be reset to factory default value, or Click Reset to reset Device or PAs. ENU STATUS : 1-0-0 Copyright - refer to title page Page 35 INSTALLATION GUIDE FOR RX-7W22, II2 Firmware There are two functions on the [Firmware] bar: [upgrade] and [swap]. [Upgrade] is used to upgrade software, and [Swap] is to replace the current firmware version with the previous one. Figure 23: Management Report Report After commissioning, PS BDA can create the summary report about the setting of all the parameters. Figure 24: Management Report ENU STATUS : 1-0-0 Copyright - refer to title page Page 36 INSTALLATION GUIDE FOR RX-7W22, II2 Log PS BDA can export the log file for troubleshooting. Figure 25: Management Log License Figure 26: Management License For the CriticalPoint BDA, users can switch the configuration anytime by changing the license in the WEBOMT. There are 4 difference licenses: 700MHz single band license, 800MHz single band license, Class A and Class B. Both 700MHz and 800MHz single band licenses are provided with a single band unit. Users can switch between 700MHz configuration and 800MHz configuration. To upgrade from single band to dual band, users need to purchase the dual band upgrade license. ENU STATUS : 1-0-0 Copyright - refer to title page Page 37 INSTALLATION GUIDE FOR RX-7W22, II2 If the equipment is in dual band originally, no license will be provided, because the equipment already comes with dual band activated. Security WEB GUI login password can be changed. Note: After changing the password, please remember the new password for the next login. Figure 27: Management Security ENU STATUS : 1-0-0 Copyright - refer to title page Page 38 INSTALLATION GUIDE FOR RX-7W22, II2 5.3 COMMISSIONING PROCEDURE To complete the installation and commissioning, users need to follow the steps below. Step 1: Click the Menu bar [Commissioning] on home screen, a work flow will be displayed. Figure 28: Commissioning Procedure Start Step 2: Click to start the process. Figure 29: Commissioning Procedure Site Info. Setting Step 3: Click

, to set the site information. ENU STATUS : 1-0-0 Copyright - refer to title page Page 39 INSTALLATION GUIDE FOR RX-7W22, II2 It is mainly used to record device location and Date/Time provides a time reference. Clicking the Config Value of Date/Time will update the Date/Time automatically. NOTE: Make sure the device is connected with appropriate donor and service antennas before proceeding to step 4. Step 4: Click to enter to Isolation Detection Screen. Figure 30: Commissioning Procedure Isolation Detection Select a frequency band (RFU) that needs to be commissioned. Click to start Isolation Detecting, then a [Confirm] window will pop-up. Click to continue. If isolation detection passes, the process will go to the RF Settiing Screen shown as Figure 38. If failed, a Tips window will pop-up, users need to check whether the system isolation is adequate. NOTE: At the end of the first frequency band commissioning, users can start other frequency band commissioning. Figure 31: Commissioning Procedure Isolation Detection Confirm ENU STATUS : 1-0-0 Copyright - refer to title page Page 40 INSTALLATION GUIDE FOR RX-7W22, II2 Step 5: After checking the isolation, Click device setting is shown. to finish the commissioning. In this window, a summary of Figure 32: Commissioning Procedure Finish End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 41 INSTALLATION GUIDE FOR RX-7W22, II2 6 MAINTENANCE The PS BDA is designed for trouble-free operation and generally does not need maintenance. Maintenance activities should only be carried out by trained personnel. Periodic inspection of the repeater equipment(s) is recommended, the recommended tasks includes:

Verify the direction and position of antennas. Re-align if necessary. Make sure the cable connector and sealing on the RF cable connectors are not damaged. Verify lightning and grounding protection is in good condition. End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 42 INSTALLATION GUIDE FOR RX-7W22, II2 7 APPENDICES 7.1 APPENDIX A:

Antenna installation:

Installation of an antenna must comply with the FCC RF exposure requirements. The antenna used for this transmitter must be mounted on permanent structures. The FCC regulations mandate that the ERP of type B signal boosters should not exceed 5W, this is equivalent to 8.2W EIRP (39.1dBm). Therefore the max antenna gain allowed for this type of signal booster should be limited to the values given by equation 1 (below) for the service antenna. Equation (1) Max Service antenna gain Max Service antenna gain (dBi) = 39.1-(37dBm-# of antennas in dB cable losses in dB). For example:

4 1 10 No. of Antennas Cable losses 3 3 3 Max Allowed Antenna Gain 39.1-(37-6-3)=11.1dBi 39.1-(37-0-3)=5.1dBi 39.1-(37-10-3)=15.1dBi Compliance with FCC deployment rule regarding the radiation of noise Good engineering practice must be used in regard to the signal boosters noise radiation. Thus, the gain of the signal booster should be set so that the ERP of the output noise from PS BDA should not exceed the level of -43 dBm in 10 kHz measurement bandwidth. In the event that the noise level measured exceeds the aforementioned value, the PS BDA gain should be decreased accordingly. In general, the ERP of noise on a spectrum more than 1 MHz outside of the pass band should not exceed -

70 dBm in a 10 kHz measurement bandwidth. RX-7W22 PS BDA has a noise level of -40.55dBm in 10 kHz measurement at 1MHz spectrum outside the pass band of BDA and an in-band noise level at around -23.64 dBm in a 10 kHz bandwidth. Therefore, the noise at the antenna input port should be calculated based on equation (2). Equation (2) Input Noise to service antenna Input Noise to service antenna:

-23.64dBm antenna splitter losses in dB cable loss in dB For example: in band noise RX-7W22 PS BDA connected to 10 service antennas with a 100m long inch cable. Losses of such a cable with the connectors = 12dB Assuming 10 service antennas: antenna splitter losses = 10 dB Based on equation (2) Input antenna noise (to the antenna) = 23.64 12 11=-46.64 dBm ERP ENU STATUS : 1-0-0 Copyright - refer to title page Page 43 INSTALLATION GUIDE FOR RX-7W22, II2 For example: Out of band noise RX-7W22 PS BDA connected to 10 service antennas with a 100m long inch cable. Losses of such a cable with the connectors = 12dB Assuming 10 service antennas: antenna splitter losses = 10 dB Based on equation (2) Input antenna noise (to the antenna) = 49.8 12 11= 72.8dBm ERP Conclusion:

Good engineering practice requires that in general when the out of band noise measured at the service antenna input is more than -70 dBm per 10 kHz measurement bandwidth, an external band pass filter should be added to attenuate the out of band noise level or decrease the system gain to low the noise level. All Comba BDAs include high selectivity duplexers and filters to attenuate the out of band noise. Compliance with FCC Part 90.219 (d)(6)(i) The deployment rules require that the ERP of intermodulation products should in general not exceed -30dBm. This is not a formidable task since in the vast majority of the passive DAS installations; the signal loss in the DAS due to splitting to multiple antenna and cable losses is significant. As well as the above RX-7W22 PS BDA is more likely to be used in a multicarrier environment (more than 2 carriers), which in turn will reduce the intermodulation products produced by the device. The following statement is already in the user manual to highlight the requirement to the installer for the instances where the above does not reduce the ERP of the intermodulation products to -30dBm. The installation procedure must result in RX-7W22 PS BDA complying with FCC requirements 90.219(d). In order to meet FCC requirements 90.219(d), it may be necessary for the installer to reduce the UL and/or DL output power for certain installations. ENU STATUS : 1-0-0 Copyright - refer to title page Page 44 INSTALLATION GUIDE FOR RX-7W22, II2 7.2 APPENDIX B: TOOLS The following are the recommended list of tools for new installation and routine maintenance. Slotted Screwdriver Philips Screwdriver Ring Spanner (Assorted size: 12~20mm) Electrically operated drill and masonry drill bits 12mm Anti-static Wrist Strap Side Cutter Frequency Counter (e.g. FLUKE PM6685R) RF Power Meter (e.g. Bird 5000) ENU STATUS : 1-0-0 Copyright - refer to title page Page 45 INSTALLATION GUIDE FOR RX-7W22, II2 7.3 APPENDIX C: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT Product Name: Public Safety BDA Model: RX-7W22 Harmful substance and content of this product as below table shown:

Harmful Substance Part Name A B Pb Hg Cd Cr (VI) PBB PBDE Note: Above table complies with SJ/T 11364.

: Indicates that the harmful substance content in all homogeneous materials for corresponding part is under the limited requirement of GB/T 26572.

: Indicates that the harmful substance content in at least one single homogeneous material for the corresponding part exceeds the limited requirement of GB/T 26572. Remark: The content of the parts marked with above exceeds the requirement as there is still no mature alternative technologies to achieve the replacement of poisonous and harmful materials or elements. ENU STATUS : 1-0-0 Copyright - refer to title page Page 46 INSTALLATION GUIDE FOR RX-7W22, II2 7.4 APPENDIX D: TROUBLESHOOTING QUICK GUIDE Alarm list:

Signal Booster Failure Dry contact alarm Over Temperature alarm Low Input alarm Antenna Malfunction Dry contact alarm PLL alarm VSWR alarm LNA alarm DL PA alarm Shutdown alarm High input alarm Figure 33: Alarm list Troubleshooting:

Alarms Causes and actions Low input

(for DT port) DT composite input power lower than -80dBm will trigger the alarm 1. Donor antenna/passive system failure 2. Wrong channel frequency setting 3. Site is not commissioned yet VSWR Service antenna/passive system failure Over temperature Environment temperature shall be lower than 140degF (60degC) PLL

(Phase lock loop) LNA

(Low noise amp.) DL PA

(Downlink amp.) Shutdown High input

(for DT port) Hardware failure, RMA the equipment Hardware failure, RMA the equipment 1. Handling RF connectors when RF power is ON may damage LNA 2. High power injection to DT/MT port may damage LNA Fix any other existing alarms first, then reset PA (see next page) If alarm still exists, RMA the equipment Other critical alarm causes the equipment shutdown Follow instructions to fix other alarms first Check input power to DT port, the power shall be lower than -30dBm 1. Avoid other inference 2. Put attenuator between antenna and PS BDA, if donor signal is high ENU STATUS : 1-0-0 Copyright - refer to title page Page 47 INSTALLATION GUIDE FOR RX-7W22, II2 Reset PA:

The Downlink PA will try to automatically reboot during the first 2 hours after alarms occur and then may shutdown permanently if alarms still exist. Users need to manually reset the PA in WEBOMT after fixing the alarm. Go to Management -> Device Reset: Click the Reset button at the lower table to reset DL PA for 800MHz or 700MHz Figure 34: Reset PA The power detection can be done from the reading number in WEBOMT, available in:

Power detection:

Downlink input power (per channel) Downlink output power (composite) Uplink input power (per channel) are able to detect both DL and UL signals Isolation:

Or from the test ports for DT/MT, which are 27dB lower than the DT/MT port respectively, the test ports The system doesnt allow users to set a gain higher than isolation-20dB. The PS BDA has a mandatory process to check the isolation during commissioning, when isolation is not good (lower than 120dB, even though the PS BDA passes the commissioning process), a check on isolation (between donor and service antennas) is always recommended. The maximum system gain that can be set must be 20dB lower than the isolation. (For example, if the isolation is 110dB, then the maximum gain that can be set is 90dB.) The PS BDA has an automatic process that prevents the gain being set to a value that does not follow this parameter. If this gain is insufficient, then the isolation situation must be corrected to provide a higher isolation value. Safety operation to protect the LNA (low noise amplifier):

1. Connect RF cables before powering on. ENU STATUS : 1-0-0 Copyright - refer to title page Page 48 INSTALLATION GUIDE FOR RX-7W22, II2 2. Any changes or handling of the RF connection requires user to switch off RF power (RF switch off in WEBOMT) or power off the unit first. ENU STATUS : 1-0-0 Copyright - refer to title page Page 49 INSTALLATION GUIDE FOR RX-7W22, II2 7.5 APPENDIX E: DEVICE REPORT EXAMPLE ENU STATUS : 1-0-0 Copyright - refer to title page Page 50 INSTALLATION GUIDE FOR RX-7W22, II2 7.6 APPENDIX F: RMA (RETURN MATERIAL AUTHORIZATION) End of Section End of Document ENU STATUS : 1-0-0 Copyright - refer to title page Page 51 INSTALLATION GUIDE FOR RX-7W22, II2 ENU STATUS : 1-0-0 Copyright - refer to title page Page 51

a) b) c) d) e) f) g) SGS North America Inc. 620 Old Peachtree Road SUITE 100 Suwanee, Georgia 30024 United States Applicant Declaration 611 East Wing, No. 8 Science Park West Avenue, Hk, 510663, China Applicant Legal Business Name Comba Telecom Ltd. Address Grantee Code FCC ID Contact Email Contact Phone Authorized Contact Name PX8 PX8RXB37 Ronin Gong

822225788 I, the undersigned, certify that I am an authorized signatory for the Applicant and therefore declare;

in accordance with 47CFR2.911(d), all of the statements herein and the exhibits attached hereto are true and correct to the best of my knowledge and belief. in accepting a Grant of Equipment Authorization issued by a TCB, under the authority of the FCC, as a result of the representations made in this application, the Applicant is responsible for:

labeling the equipment with the exact FCC ID as specified in this application,

(1)

(2) compliance statement labeling pursuant to the applicable rules,

(3) compliance of the equipment with the applicable technical rules, if the Applicant is not the actual manufacturer of the equipment, appropriate arrangements have been made with the manufacturer to ensure that production units of this equipment will continue to comply with the FCCs technical requirements. in accordance with 47 CFR 2.909 and KDB394321, the Applicant has read, understood and agrees to accept that they are the responsible party and agree to abide by their responsibilities as specified under 47 CFR 2.909 and KDB394321. in accordance with ISO17065, FCC KDB641163, FCC KDB610077, KDB394321 and RSP-100, the Applicant has read, understood, accepts and agrees to abide by the post market surveillance requirements.

(1)

(2)

(3) the Applicant understands, accepts and agrees that a sample may be requested for surveillance testing. the Applicant shall make provisions to always have a production sample available upon request by SGS, FCC and/or ISED. the Applicant shall, upon request by SGS, at the Applicants expense, provide a production sample of the requested product to SGS, FCC and/or ISED as instructed. The sample shall include all support devices, cables, software, accessories or other hardware or software required for evaluation, review, certification and audit surveillance of products certified by SGS. neither the Applicant nor any party to the application is subject to a denial of Federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 862 because of a conviction for possession or distribution of a controlled substance. See 47CFR 1.2002(b) for the definition of a party for these purposes. the Applicant has read, understood, accepts and agrees to abide by the SGS North America, Inc.(TCB) terms and conditions. Link to CFRs: https://www.fcc.gov/wireless/bureau-divisions/technologies-systems-and-innovation-division/rules-regulations-title-47 Link to KDBs: https://apps.fcc.gov/oetcf/kdb/index.cfm Link to RSP-100: https://www.ic.gc.ca/eic/site/smt-gst.nsf/eng/sf01130.html

*NOTE: This declaration cannot be signed by an Agent, it shall be signed by an authorized person listed in the FCC database Applicant Declaration Rev:0.0

Comba Telecom Ltd. Confidentiality Request regarding application for FCC ID: PX8RXA37; PX8RXB37;

611 East Wing, No. 8 Science Park West Avenue, Hk HongKong, 510663, China SGS North America Inc. 620 Old Peachtree Road SUITE 100 Suwanee, Georgia United States To:

From: Comba Telecom Ltd. Regarding:

According to FCC KDB 935210 D02 Signal Boosters Certification v04r02 section V (g) requirement:

(g) Attestation (must be non-confidential exhibit, signed by the applicant; signature by test lab, agent, or TCB is not acceptable) should include:

(1) Warning label messages and Class A/B disclosure will be also shown in online and point-of-sale marketing materials and on outside packaging of device:

we Comba telecom Ltd declared our Warning label messages and Class A/B disclosure will be also shown in online and point-of-sale marketing materials and on outside packaging of device. for FCC ID: PX8RXA37;

THIS IS A 90.219 CLASS A DEVICE. WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express consent of an FCC Licensee to operate this device. The PS BDA can be configured as Class A ( FCC ID: PX8RXA37) Signal Booster. You MUST register Class B signal boosters (as defined in 47 CFR 90.219) online at www.fcc.gov/signal-boosters/registration. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation. for FCC ID: PX8RXB37;

THIS IS A 90.219 CLASS B DEVICE. WARNING. This is NOT a CONSUMER device. It is designed for installation by FCC LICENSEES and QUALIFIED INSTALLERS. You MUST have an FCC LICENSE or express consent of an FCC Licensee to operate this device. The PS BDA can be configured as Class B (FCC ID: PX8RXB37) Signal Booster. You MUST register Class B signal boosters (as defined in 47 CFR 90.219) online at www.fcc.gov/signal-boosters/registration. Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing violation. Sincerely,

To: SGS North America Inc. 620 Old Peachtree Road SUITE 100 Suwanee, Georgia United States From: Comba Telecom Ltd. 611 East Wing, No. 8 Science Park West Avenue, Hk Regarding: Confidentiality Request regarding application for FCC ID: PX8RXB37 LONG TERM CONFIDENTIALITY Pursuant to 47 CFR Section 0.459 and 0.457 of the commissions rules, the applicant hereby request confidential treatment of the documents listed below, associated with the certification application referenced above. Schematic(s) Block Diagrams Operational Descriptions The documents above contain proprietary information not released to the public. Public disclosure of this information may prove harmful to the business of the applicant. Sincerely, Name (Printed): Ronin Gong Title: Director Signature: Prman Cor On behalf of Company: Comba Telecom Ltd.

Date: 2020-05-26 TO: Federal Communication Commission Equipment Authorization Branch 7435 Oakland Mills Road Columbia, MID 21046 Regarding: PX8RXB37 To whom it may concern:

We, the undersigned, hereby authorize SGS-CSTC Standards Technical Services Co., Ltd. (SGS) Guangzhou branch and Kobe Jian in SGS-CSTC Standards Technical Services Co., Ltd. (SGS) Guangzhou branch to act on our behalf in all manners relating to application for equipment authorization with respect to the FCC ID above, including signing of all documents relating to these matters. Any and all acts carried out by the agent on our behalf shall have the same effect as acts of our own. We, the undersigned, hereby certify that we are not subject to a denial of federal benefits, that includes FCC benefits, pursuant to Section 5301 of the Anti-Drug Abuse Act of 1988, 21 U.S.C. 853(a). Where our agent signs the application for certification on our behalf, | acknowledge that all responsibility for complying with the terms and conditions for Certification, as specified by SGS North America, Inc., still resides with <<Comba Telecom Ltd.>>. This authorization is valid until further written notice from the applicant. Name (Printed): Ronin Gong Title: Director Signature: Poin GO On behalf of Company: Comba Telecom Ltd.