FCC ID: PX8RX78V2F-B Public Safety Bi-directional Amplifier

CriticalPoint PUBLIC SAFETY BI-

DIRECTIONAL AMPLIFIER USER MANUAL RX78V2F-B-AC QE: 1-0-0 Comba Telecom Network Systems Ltd. INSTALLATION GUIDE FOR RX78V2F-B-AC 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This is an unpublished work the copyright in which vests in Comba International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 INSTALLATION GUIDE FOR RX78V2F-B-AC 0.1 CONTENTS Section Page 0.1 0.2 0.3 0.4 0.5 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 5.2.4 6 7 7.1 7.2 7.3 CONTENTS ....................................................................................................................................... 4 INDEX TO FIGURES AND TABLES ............................................................................................. 6 HISTORY ........................................................................................................................................... 7 GLOSSARY OF TERMS ................................................................................................................. 8 SAFETY NOTICES AND ADMONISHMENTS ............................................................................ 9 GENERAL INFORMATION ........................................................................................................... 11 EQUIPMENT DESCRIPTION ....................................................................................................... 13 FUNCTIONAL BLOCK DIAGRAM ............................................................................................... 13 EQUIPMENT LAYOUT .................................................................................................................. 14 EQUIPMENT CONSTITUTION .................................................................................................... 15 INSTALLATION .............................................................................................................................. 16 WARNINGS AND ALERTS ........................................................................................................... 16 SITE PLANNING CONSIDERATIONS ....................................................................................... 17 SITE PLANNING ............................................................................................................................ 17 INSTALLATION CHECKLIST ....................................................................................................... 18 INSTALLATION PROCEDURES ................................................................................................. 19 GOODS INWARDS INSPECTION............................................................................................... 19 TOOLS ............................................................................................................................................. 19 PREPARATION .............................................................................................................................. 19 WALL MOUNTING ......................................................................................................................... 20 DRIP-LOOP ..................................................................................................................................... 20 EQUIPMENT CONNECTORS ...................................................................................................... 21 PS BDA CONNECTORS ............................................................................................................... 21 PS BDA LED INDICATORS.......................................................................................................... 22 GROUNDING CONNECTION ...................................................................................................... 22 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

[DEVICE] ......................................................................................................................................... 29

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

[TOOLS] ........................................................................................................................................... 31

[MANAGEMENT] ............................................................................................................................ 32 MAINTENANCE .............................................................................................................................. 35 APPENDICES ................................................................................................................................. 36 APPENDIX A: TOOLS ................................................................................................................... 36 APPENDIX B: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT ................ 37 APPENDIX C: TROUBLESHOOTING QUICK GUIDE ............................................................. 38 ENU STATUS : 1-0-0 Copyright - refer to title page Page 4 INSTALLATION GUIDE FOR RX78V2F-B-AC 7.4 7.5 APPENDIX D: DEVICE REPORT EXAMPLE ............................................................................ 40 APPENDIX E: RMA (RETURN MATERIAL AUTHORIZATION) ............................................. 41 ENU STATUS : 1-0-0 Copyright - refer to title page Page 5 INSTALLATION GUIDE FOR RX78V2F-B-AC 0.2 INDEX TO FIGURES AND TABLES Figure 1: Front, Side and Bottom Views of the PS BDA Enclosure ................................................................. 11 Figure 2: PS BDA Functional Block Diagram................................................................................................... 13 Figure 3: Layout of the PS BDA ....................................................................................................................... 14 Figure 4: Mounting Rack Overview .................................................................................................................. 19 Figure 5: PS BDA Wall Mounting ..................................................................................................................... 20 Figure 6: Equipment Connectors ..................................................................................................................... 21 Figure 7: LED Indicators .................................................................................................................................. 22 Figure 8: Commissioning Procedure ................................................................................................................ 26 Figure 9: Input IP Address ............................................................................................................................... 28 Figure 10: Input Domain Name ........................................................................................................................ 28 Figure 11: Input User Name and Password ..................................................................................................... 28 Figure 12: Web GUI Main Screen .................................................................................................................... 29 Figure 13: Overview Screen............................................................................................................................. 29 Figure 14: External/Dry Contact ALM Screen .................................................................................................. 30 Figure 15: Channels Screen ............................................................................................................................ 30 Figure 16: Fast commission Screen ................................................................................................................ 31 Figure 17: Isolation Check Screen ................................................................................................................... 31 Figure 18: Reset/Import/Export Screen ........................................................................................................... 32 Figure 19: License Screen ............................................................................................................................... 32 Figure 20: Firmware Upgrade Screen .............................................................................................................. 33 Figure 21: Device Information Screen ............................................................................................................ 33 Figure 22: User Management Screen ............................................................................................................. 34 Figure 23: Alarm list ......................................................................................................................................... 38 Figure 24: Reset PA ......................................................................................................................................... 39 Table 1: Equipment Connectors ...................................................................................................................... 21 Table 2: LED Indicators .................................................................................................................................... 22 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 INSTALLATION GUIDE FOR RX78V2F-B-AC 0.3 HISTORY Change No. 1 ENU 1-0-0 Details Of Change This manual first created and issued in Aug,2022 ENU STATUS : 1-0-0 Copyright - refer to title page Page 7 INSTALLATION GUIDE FOR RX78V2F-B-AC 0.4 GLOSSARY OF TERMS Abbreviation Definition ALC 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 Automatic Level Control 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 RX78V2F-B-AC 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 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 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 or Class B 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. Class B:

When the Maximum antenna gain is 3dBi for downlink and the shortest distance from the human specific is 0.87m, the device is compliant with the requirement MPE limit for uncontrolled exposure. WARNING!

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 ENU STATUS : 1-0-0 Copyright - refer to title page Page 9 INSTALLATION GUIDE FOR RX78V2F-B-AC user to fine. Ambient temperature range for equipment use: -33 to 55 degrees Celsius. This equipment is not suitable for use in locations where children are likely to be present. The product shall connection of the equipment protective earthing conductor to the installation protective earthing conductor (for example, by means of a power cord connected to a socket-outlet with earthing connection). When the plug on the power supply cord is used as the disconnect device, the socket-outlet shall be easily accessible. End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 10 INSTALLATION GUIDE FOR RX78V2F-B-AC 1 GENERAL INFORMATION The RX78V2F-B-AC 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 RX78V2F-B-AC 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 Digital/programmable utilizing FPGA Supports public safety 700/800MHz Supports P25 P1/P2 digital and conventional analogy communications simultaneously Single band versions include license to switch from original band to alternate band Shared channels (UL sharing 96C, DL 64C+64C) 2W downlink output power for each band Channelized Auto Gain Control (AGC) / Channelized uplink squelch Built-in mandatory isolation test to prevent BDA oscillation Power Charge interface Auto shutdown with alarm upon oscillation detection Web based GUI for intelligent configuration NFPA compliant dry contact alarms, NEMA 4X enclosure 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 RX78V2F-B-AC Electrical Frequency Range, Uplink Frequency Range, Downlink Share Channels Total Output Power, Uplink (Typical) Total Output Power, Downlink Maximum System Gain Gain Adjustment Range (1dB step) Pass Band Ripple, p-p Uplink Noise Figure at max gain Out-of-Band emission Spurious 9kHz to 1GHz 1GHz to 12.75GHz Maximum RF Input Power without Damage Maximum RF Input Power without Overdrive Input VSWR Antenna port Impedance Mechanical Dimensions, H x W x D Weight (without bracket) Power Supply (different hardware type) Power Consumption (Dual band, UL mute) Enclosure Cooling RF Connectors * 2 Test Port * 4 LED * 10 Communication port *2 Reserved knock port for external cable rolling Operating Temperature Operating Humidity Environmental Class MHz MHz dBm dBm dB dB dB dB dBc dBm dBm dBm dBm

mm Kg VAC W oC 700MHz 788-805 758-775 800MHz 806-816 851-861 UL sharing 96C, DL 64C+64C 27 33 90 33 90 80(Input 30dB, Output 20dB, digital ATT 30dB) 4 7 4 7 FCC Compliance FCC Compliance FCC Compliance

+10

-10 1.5 50

+10

-10 1.5 50 330 * 490 * 196 (31.7L) 20 100-240 / 47-63Hz

<100 Convection N-Female SMA (UL, DL, DT-Test, MT-Test) Alarm/RUN ALM 1~8 RJ45 (LAN, OMT) 6 ports

-33 to +55 95%

NEMA 4X Note: Typical specifications at room temperature ENU STATUS : 1-0-0 Copyright - refer to title page Page 12 INSTALLATION GUIDE FOR RX78V2F-B-AC 2 EQUIPMENT DESCRIPTION 2.1 FUNCTIONAL BLOCK DIAGRAM Figure 2: PS BDA Functional Block Diagram 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 13 LNAADCADCFPGADACDACLNAAMP PA LNAADCDACAMPDL_1DL_2AMPDPA_1DPA_2ULDLAC INPUTBATT INPUTPSUTransceiverTransceiver50dBINPUT=-57dBm-7dB47dBOUTPUT=33dBm53dBINPUT = -63dBm-7dB44dBOUTPUT = 27dBmDTMTULDL INSTALLATION GUIDE FOR RX78V2F-B-AC 2.2 EQUIPMENT LAYOUT Shown below is the internal layout of the PS BDA. Figure 3: Layout of the PS BDA ENU STATUS : 1-0-0 Copyright - refer to title page Page 14 INSTALLATION GUIDE FOR RX78V2F-B-AC 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. Multiplexer: 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 15 INSTALLATION GUIDE FOR RX78V2F-B-AC 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. 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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 16 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 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. 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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 17 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 18 INSTALLATION GUIDE FOR RX78V2F-B-AC 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. 3.3.2 TOOLS See Appendix A for a full list of the recommended tools required for installation and routine maintenance. 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 19 INSTALLATION GUIDE FOR RX78V2F-B-AC 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. 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 20 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 Knock Out 3/4: For Hybrid cable (include AC cable and monitor cable from BBU) 1: Reserved. 1/2: For Dry contactors or External alarm cables DT Test MT Test DT MT OMT LAN UL/DL SMA connector for DT port test, -28dB coupling to DT port, available for both downlink and uplink test. SMA connector for MT port test, -28dB coupling to MT port, available for both downlink and uplink test.

*: the antenna is not provided by Comba, the connector type of the system for the antenna is N-Female. 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. Reserved for DAS system ENU STATUS : 1-0-0 Copyright - refer to title page Page 21 INSTALLATION GUIDE FOR RX78V2F-B-AC 3.4.2 PS BDA LED INDICATORS The LED indicators help user to check the equipment status easily. Figure 7: LED Indicators Table 2: LED Indicators Identifier Colour Indication RUN ALM Green Operation indicator, flashes every second to indicate normal operation. Red Alarm indicator. ON = alarm; OFF = no alarm. DRY1 Red/Green Green=Normal; Red=Alarm(AC power) DRY2~8 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. ENU STATUS : 1-0-0 Copyright - refer to title page Page 22 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 23 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 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 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-

ALM2 AUX End of Section 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) 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 ENU STATUS : 1-0-0 Copyright - refer to title page Page 24 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 25 INSTALLATION GUIDE FOR RX78V2F-B-AC 4.2 COMMISSIONING PROCEDURE Perform the following procedures for system commissioning. Figure 8: Commissioning Procedure ENU STATUS : 1-0-0 Copyright - refer to title page Page 26 Start commissioning guide in WEB GUIIsolation detectionInput power detection from control channelSet channel total numbersGet the recommended DL and UL parametersSet frequency and gain for each channel in Device page, and turn on RF switchesFine tuning DL/UL gains for channelsEndSet Control channel frequencySet unit parameters INSTALLATION GUIDE FOR RX78V2F-B-AC Table 4: Commissioning Task Explanation Commissioning Tasks Observation 1. Isolation detection 2. Set control channel frequencies 3. Set Channel No. 4. Recommended DL and UL gain parameters Detect isolation of service antenna and donor antenna. 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. Enter the total channel numbers 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 27 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 9: Input IP Address Figure 10: Input Domain Name Step 3: Input User Name: admin; Password (default password: admin). Click [Log in]. Figure 11: Input User Name and Password ENU STATUS : 1-0-0 Copyright - refer to title page Page 28 INSTALLATION GUIDE FOR RX78V2F-B-AC 5.2 WEB GUI INTRODUCTION After log in, the Web GUI main screen will appear. Figure 12: Web GUI Main Screen On Comba Web GUI Home Screen, there are three Menu bars:

[Device], [Commissioning], [Tools] and [Management]. 5.2.1 [DEVICE]

The [Device] Screen shows the equipment status, such as BDA overview, External/Dry Contact ALM, Internal Charger Status and Advance setting, etc. Overview Figure 13: Overview Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 29 INSTALLATION GUIDE FOR RX78V2F-B-AC External/Dry Contact ALM This screen shows the alarm status. Figure 14: External/Dry Contact ALM Screen Channels This screen is available for PS BDA to adjust the center frequency and the bandwidth. Figure 15: Channels Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 30 INSTALLATION GUIDE FOR RX78V2F-B-AC 5.2.2 [COMMISSIONING]

A work flow of the commissioning process is shown on [Commissioning] Screen. Figure 16: Fast commission Screen Figure 17: Isolation Check Screen 5.2.3 [TOOLS]

The [Tools] screen includes Reset/Import/Export and License. ENU STATUS : 1-0-0 Copyright - refer to title page Page 31 INSTALLATION GUIDE FOR RX78V2F-B-AC Figure 18: Reset/Import/Export Screen Note: Click Restore, all the parameters and alarms will be reset to factory default value, or Click Reset to reset Device or PAs. Figure 19: License Screen 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. If the equipment is in dual band originally, no license will be provided, because the equipment already comes with dual band activated. 5.2.4 [MANAGEMENT]

The [Management] screen includes Firmware Upgrade, Device Information and User Management. ENU STATUS : 1-0-0 Copyright - refer to title page Page 32 INSTALLATION GUIDE FOR RX78V2F-B-AC Figure 20: Firmware Upgrade Screen Figure 21: Device Information Screen ENU STATUS : 1-0-0 Copyright - refer to title page Page 33 INSTALLATION GUIDE FOR RX78V2F-B-AC Figure 22: User Management Screen End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 34 INSTALLATION GUIDE FOR RX78V2F-B-AC 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 35 INSTALLATION GUIDE FOR RX78V2F-B-AC 7 APPENDICES 7.1 APPENDIX A: 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 36 INSTALLATION GUIDE FOR RX78V2F-B-AC 7.2 APPENDIX B: 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:

Part Name A B Harmful Substance 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 37 INSTALLATION GUIDE FOR RX78V2F-B-AC 7.3 APPENDIX C: TROUBLESHOOTING QUICK GUIDE Alarm list:

Troubleshooting:

Alarms Causes and actions Figure 23: Alarm list 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.) 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 DL PA

(Downlink amp.) Fix any other existing alarms first, then reset PA (see next page) If alarm still exists, RMA the equipment Shutdown High input

(for DT port) 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 38 DL PA alarmVSWR alarmOver Temperature alarmLow Input alarmAntenna MalfunctionDry contact alarmShutdown alarmHigh input alarmSignal Booster FailureDry contact alarmLNA alarmPLL alarm INSTALLATION GUIDE FOR RX78V2F-B-AC 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 Power detection:

Figure 24: Reset PA The power detection can be done from the reading number in WEBOMT, available in:

Downlink input power (per channel) Downlink output power (composite) Uplink input power (per channel) Or from the test ports for DT/MT, which are 27dB lower than the DT/MT port respectively, the test ports are able to detect both DL and UL signals Isolation:

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. 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 39 INSTALLATION GUIDE FOR RX78V2F-B-AC 7.4 APPENDIX D: DEVICE REPORT EXAMPLE ENU STATUS : 1-0-0 Copyright - refer to title page Page 40 INSTALLATION GUIDE FOR RX78V2F-B-AC 7.5 APPENDIX E: RMA (RETURN MATERIAL AUTHORIZATION) End of Section End of Document ENU STATUS : 1-0-0 Copyright - refer to title page Page 41 INSTALLATION GUIDE FOR RX78V2F-B-AC ENU STATUS : 1-0-0 Copyright - refer to title page Page 42

Comba RX78V2F-B-AC Public Safety Bi-directional Amplifier sn:

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Comba Telecom Network Systems Li Comba

/Model No.: RX78V2F-B-AC FCC ID: PXSRX78V2F-B This is a 90.219 class B device complies with FCC part 90 sigual booster rules,

|wwew.comba-telecom.com Comba Telecom Network Systems Limited Comba WARNING. This is NOT a CONSUMER device. Itis 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. You MUST, register Class B signal boosters (as defined in 47 CFR 90.219) online at www.fce.gov/signal-boosters/registration.

[Unauthorized use may result in significant forfeiture penalties, including penalties in excess of $100,000 for each continuing, violation. Comba Telecom Network Systems Limited

Comba Telecom Network Systems Limited Flat/Rm 10, 3/F, Bio-

Informatics Ctr, 2 Science Park West Avenue, HK Science Park, Pak Shek Kok, N.T. H ong Kong Authority to Act as Agent Date: January 6, 2022 American Certification Body, Inc. 6731 Whittier Avenue Suite C110 McLean, VA 22101 To Whom It May Concern:

Guangzhou Grg Metrology & Test Co Ltd / Krystal Yang is authorized to act on our behalf, until otherwise notified, for applications to American Certification Body, Inc. (ACB). We certify that we are not subject to 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. Further, no party, as defined in 47 CFR 1.2002 (b), to the application is subject to denial of federal benefits, that includes FCC benefits. We also declare that the information provided to the FCC is true and correct to the best of our knowledge (47 CFR 2.911(d)) and we have been informed of the grantee responsibilities (47 CFR 2.909) with regard to certified equipment. Thank you, Agency Agreement Expiration Date: _____2022-12-14___ By:

(Signature1) Ronin Gong

(Print name) Title: Director On behalf of: _Comba Telecom Network Systems Limited

(Company Name) 1 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriate letterhead. 102920 13

Comba Telecom Network Systems Limited Flat/Rm 10, 3/F, BioInformatics Ctr, 2 Science Park West Avenue, HK Scie nce Park, Pak Shek Kok, N.T. Hong Kong To:American Certification Body. Inc. (ACB) From: Comba Telecom Network Systems Limited Flat/Rm 10, 3/F, BioInformatics Ctr, 2 Science Park West Avenue, HK Science Park, Pak Shek Kok, N.T. Hong Kong Regarding Confidentiality Request regarding application for FCC ID: PX8RX78V2F-B According to FCC KDB 935210 D02 Signal Boosters Certification v04r02 section V(g) requirement;

(g)Attestation(must be non-confidentical 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 outside packaging of device;

We Comba Telecom Network Systems Limited declared our Warning label message and Class A/B disclosure will be also shown in online and point-of-sale marketing materials and outside packaging of device;

For FCC ID: PX8RX78V2F-B 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 operrate this device. 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, Name(Printed)Ronin Gong Title Director Signature On behalf of Company: Comba Telecom Network Systems Limited

Declaration of conformity We, Comba Telecom Network Systems Limited

(Name of manufacturer or his authorized representative) Flat/Rm 10, 3/F, BioInformatics Ctr, 2 Science Park West Avenue, HK Science Park, Pak Shek Kok, N.T. Hong Kong Declare under our own responsibility that the operation frequency of the product Name:Public Safety Bi-directional Amplifier Model: RX78V2F-B-AC is authorized frequencies below:

700MHz Band: :Downlink758MHz ~ 775MHz, Uplink: 799MHz ~ 805MHz 800MHz Band: :Downlink851MHz ~ 861MHz, Uplink: 806MHz ~ 816MHz We are acknowledging that the FCC rules are violated if the device operates on unauthorized frequencies. In additionally, please be kindly noted that the warning label messages and the Class B disclosure will be also shown in online and point-of-sale marketing materials and on outside packaging of device. Hong Kong 16/8/22

(Place, date) (Name and signature of person responsible)

Comba Telecom Network Systems LimitedFlat/Rm 10, 3/F, BioInformatics Ctr, 2 Science Park West Avenue, HK Science Park, Pak Shek Kok, N.T. Hong Kong Request for Confidentiality Date: August 19, 2022 Subject: Confidentiality Request for: ___PX8RX78V2F-B_____ Pursuant to FCC 47 CFR 0.457(d) and 0.459 and IC RSP-100, Section 12.4, the applicant requests that a part of the subject FCC application be held confidential. Type of Confidentiality Requested Short Term Short Term Short Term Short Term Short Term Short Term Short Term Short Term Short Term Permanent Permanent *1 Permanent Permanent Permanent Permanent Permanent *3 Exhibit Block Diagrams External Photos Internal Photos Operation Description/Theory of Operation Parts List & Placement/BOM Tune-Up Procedure Schematics Test Setup Photos Users Manual _Comba Telecom Network Systems Limited ____ has spent substantial effort in developing this product and it is one of the first of its kind in industry. Having the subject information easily available to "competition" would negate the advantage they have achieved by developing this product. Not protecting the details of the design will result in financial hardship. Permanent Confidentiality:

The applicant requests the exhibits listed above as permanently confidential be permanently withheld from public review due to materials that contain trade secrets and proprietary information not customarily released to the public. Short-Term Confidentiality:

The applicant requests the exhibits selected above as short term confidential be withheld from public view for a period of ___(specify number of days not to exceed 180)2___ days from the date of the Grant of Equipment Authorization and prior to marketing. This is to avoid premature release of sensitive information prior to marketing or release of the product to the public. Applicant is also aware that they are responsible to notify ACB in the event information regarding the product or the product is made available to the public before the requested period has expired. ACB will then release the documents listed above for public disclosure pursuant to FCC Public Notice DA 04-1705. NOTE for Industry Canada Applications:

IC currently only distinguishes Permanent Confidentiality exhibits as shown above. Short Term confidentiality is not considered applicable to IC applications. Sincerely, By:

(Signature/Title3) Ronin Gong

(Print name) 1 - The asterisked items (*) require further information to be provided to ACB before permanent confidentiality will be extended to these exhibits. Please refer to FCC KDB 726920 and the specific Document link for D01 found at:

https://apps.fcc.gov/oetcf/kdb/forms/FTSSearchResultPage.cfm?switch=P&id=41731 and review section II, 3) regarding specific information that must accompany these requests. 2 - Please refer to http://acbcert.com/documents/misc-docs/Memo-Short-Term-Vs-Standard-Confidentiality.pdf for complete details. 3 - Must be signed by applicant contact given for applicant on the FCC site, or by the authorized agent if an appropriate authorized agent letter has been provided. Letters should be placed on appropriate letterhead. 102920 13