FCC ID: PX8RH78V3-B Public Safety DAS

CriticalPoint Public Safety DAS DISTRIBUTED ANTENNA SYSTEM USER MANUAL Public Safety DAS System QE: 1-0-0 Comba Telecom Network Systems Limited 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This is an unpublished work the copyright in which vests in Comba Telecom Network Systems Limited ("Comba").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. INSTALLATION GUIDE FOR DAS 0.1 CONTENTS Section Page 0.1 0.2 0.3 0.4 0.5 1 2 2.1 2.3 2.4 2.4.1 2.5 2.5.1 2.5.2 2.5.3 2.6 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 3.3.6 3.3.7 3.3.8 3.3.9 3.3.10 3.3.11 3.3.12 3.3.13 3.3.14 4 4.1 4.2 5 5.1 5.2 2 CONTENTS ........................................................................................................................................ 3 INDEX TO FIGURES AND TABLES ............................................................................................... 5 HISTORY ........................................................................................................................................... 6 GLOSSARY OF TERMS ................................................................................................................... 7 SAFETY NOTICES AND ADMONISHMENTS .............................................................................. 8 GENERAL INFORMATION ........................................................................................................... 10 EQUIPMENT DESCRIPTION ......................................................................................................... 12 SYSTEM DIAGRAM ....................................................................................................................... 12 EQUIPMENT CONSTITUTION ..................................................................................................... 13 EQUIPMENT CONNECTORS ........................................................................................................ 13 PS DAS CONNECTORS .................................................................................................................. 13 TYPICLA APPLICATION ............................................................................................................... 16 APPLICATION 1: ONE MU CONNECTS 32 RUS. ..................................................................... 16 APPLICATION 2: 2 MU (MAIN MU AND BACKUP MU) CONNECT 32 RUS. ....................... 17 APPLICATION 3: 2MU (MAIN MU AND BACKUP MU) CONNECT 16RUS WITH OPTICAL FIBER BACKUP. ............................................................................................................................ 17 SPECIFICATION OF DAS SYSTEM.............................................................................................. 18 INSTALLATION .............................................................................................................................. 21 WARNINGS AND ALERTS............................................................................................................ 21 SITE PLANNING CONSIDERATIONS ......................................................................................... 22 SITE PLANNING ............................................................................................................................. 22 INSTALLATION CHECKLIST ....................................................................................................... 23 INSTALLATION PROCEDURES ................................................................................................... 24 GOODS INWARDS INSPECTION ................................................................................................. 24 TOOLS .............................................................................................................................................. 24 PREPARATION ............................................................................................................................... 24 WALL MOUNTING FOR MU AND RU ........................................................................................ 25 DRIP-LOOP ...................................................................................................................................... 25 CABINET MOUNTING FOR EU .................................................................................................... 25 WALL MOUNTING FOR EU ......................................................................................................... 27 GROUNDING .................................................................................................................................. 30 AC/DC POWER CONNECTION FOR MU ..................................................................................... 30 AC/DC POWER AND MONITOR CABLE CONNECTION BETWEEN MU AND EU .............. 31 DC POWER AND MONITOR CABLE CONNECTION BETWEEN EU AND EU ...................... 32 RF CABLE CONNECTION ............................................................................................................. 32 WEB ACCESS .................................................................................................................................. 32 DRY CONTACT CABLE ................................................................................................................ 32 WEB GUI .......................................................................................................................................... 35 WEB GUI CONNECTION ............................................................................................................... 35 WEB GUI INTRODUCTION ........................................................................................................... 36 COMMISSIONING .......................................................................................................................... 38 PRE-COMMISSIONING TASKS .................................................................................................... 38 COMMISSIONING PROCEDURE ................................................................................................. 38 ENU STATUS : 1-0-0 Copyright - refer to title page Page 3 INSTALLATION GUIDE FOR DAS 6 7 7.1 7.2 7.3 MAINTENANCE ............................................................................................................................. 39 APPENDICES .................................................................................................................................. 40 APPENDIX A: TOOLS .................................................................................................................... 40 APPENDIX B: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT ................... 41 APPENDIX D: RMA (RETURN MATERIAL AUTHORIZATION) ............................................. 42 ENU STATUS : 1-0-0 Copyright - refer to title page Page 4 INSTALLATION GUIDE FOR DAS 0.2 INDEX TO FIGURES AND TABLES Figure 1: Master Unit (MU) ............................................................................................................................................. 10 Figure 2: Expansion Unit (EU) ......................................................................................................................................... 11 Figure 3: Remote Unit (RU) ............................................................................................................................................. 11 Figure 4: PS DAS Functional Block Diagram .................................................................................................................. 12 Figure 5: MU Equipment Connectors ................................................................................................................................ 13 Figure 6: EU Equipment Connectors ................................................................................................................................. 14 Figure 7: RU Equipment Connectors................................................................................................................................. 15 Figure 8: Application 1 System Diagram .......................................................................................................................... 16 Figure 9: Application 2 System Diagram .......................................................................................................................... 17 Figure 10: Application 3 System Diagram ........................................................................................................................ 17 Figure 11: Mounting Rack Overview ................................................................................................................................ 24 Figure 12: PS DAS (MU and RU) Wall Mounting ........................................................................................................... 25 Figure 13: Dimension of Expansion Unit for Cabinet Mounting ...................................................................................... 26 Figure 14: Expansion Unit Cabinet Mounting ................................................................................................................... 27 Figure 15: Expansion Unit Wall Mounting ....................................................................................................................... 27 Figure 16: The mounting hangers of Expansion Unit ........................................................................................................ 28 Figure 17: Hole punching diagram for Wall-mounted installation .................................................................................... 28 Figure 18: Expansion Unit Wall Mounting ....................................................................................................................... 29 Figure 19: AC/DC power connection for MU ................................................................................................................... 30 Figure 20: DC power and Monitor cable connection for EU ............................................................................................. 31 Figure 21: DC power and Monitor cable connection for EU ............................................................................................. 32 Figure 22: Input IP Address ............................................................................................................................................... 35 Figure 23: Input User Name and Password ....................................................................................................................... 35 Figure 24: Web GUI Main Screen ..................................................................................................................................... 36 Figure 25: Dashboard Screen ............................................................................................................................................. 36 Figure 26: Chanel Frequency Info ..................................................................................................................................... 37 Figure 27: Sub Band Info .................................................................................................................................................. 37 Table 1: MU Equipment Connectors ................................................................................................................................. 14 Table 2: EU Equipment Connectors .................................................................................................................................. 14 Table 3: RU Equipment Connectors .................................................................................................................................. 15 Table 4: Pin Definition of Dry Contact Cable ................................................................................................................... 32 Table 5: Commissioning Task Explanation ....................................................................................................................... 38 ENU STATUS : 1-0-0 Copyright - refer to title page Page 5 INSTALLATION GUIDE FOR DAS 0.3 HISTORY Change No. 1 ENU 1-0-0 Details Of Change This manual first created and issued in May. 2023. ENU STATUS : 1-0-0 Copyright - refer to title page Page 6 INSTALLATION GUIDE FOR DAS 0.4 GLOSSARY OF TERMS Abbreviation Definition ALC ATT BTS CH CSA dB dBm DL DT DPX FOU FS Hz ID IF LNA LOS MCU MHz MT MTBF MU NF OMC OMT OP PA PLL PSU RF RFU RU SMA TX/RX 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 Fiber Optical Unit Frequency Selection Hertz Identification Intermediate Frequency Low Noise Amplifier Line-of-Sight Main Control Unit Megahertz Mobile Terminal Mean Time Between Failures Master Unit Noise Figure Operation & Maintenance Center Operation & Maintenance Terminal Optical Fiber Power Amplifier Phase Locked Loop Power Supply Unit Radio Frequency Radio Frequency Unit Remote Unit Sub-Miniature A Connector Transmit/Receive Uplink Volts Alternating Current Volts Direct Current Voltage Standing Wave Ratio ENU STATUS : 1-0-0 Copyright - refer to title page Page 7 INSTALLATION GUIDE FOR DAS 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, 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 116.00cm 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. The design of the antenna installation needs to be implemented in such a way so as to ensure RF radiation safety levels and non-environmental pollution during operation. Note: Antennas, feeders and couplers are not included in the packing list; solution provider should consider these accessories according to site conditions. MU and RU FCC Warning Notices:

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. 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. EU Warning Notices:

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and

(2)this device must accept any interference received, including interference that may cause undesired operation. 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 ENU STATUS : 1-0-0 Copyright - refer to title page Page 8 INSTALLATION GUIDE FOR DAS 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 RU RF connectors may cause damage to the equipment when power is on. The application antenna and RF cable are not provided. The antenna gain should not exceed 4 dBi for Downlink and 9dBi for Uplink. 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 user to fines. End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 9 INSTALLATION GUIDE FOR DAS 1 GENERAL INFORMATION The Public Safety Distributed Antenna System (hereinafter called PS DAS) consists of the Master Unit (MU), the Expansion Unit (EU) and Remote Unit (RU). The MU includes the MU Chassis, Power Supply Unit (PSU), and RF module. The Expansion Unit includes the optical modules. The Fiber Optical module is a modular design, and can support up to 4 or 8 independent Remote Units. The Remote Unit is designed with a compact form for easy installation. The low signal transmission loss of optical fiber is applicable for long distance transmission. PS DAS can support optical transmission with up to 6.5dBo of optical loss, equivalent to 8 miles of fiber length. Main Features Supports P25 P1/P2, digital and conventional analog communications simultaneously Built-in cavity filtering to protect the unit from interference from FirstNet Band 14 and other neighbor bands Support up to 32 Remote Units Both Master Unit and Remote Units have the same output power for coverage Up to 64 channels per band on single band models; up to 96 channels shared across bands on dual band models (maximum of 64 on individual band) (Class A) Channelized (Class A) / Wideband Auto Level Control (ALC) supported Downlink and Uplink squelch supported NetProtectTM Uplink PA shutdown during no traffic periods to minimize noise being introduced to the network Auto shutdown with alarm upon oscillation detection Built-in mandatory isolation test to prevent system oscillation Web based GUI for intelligent configuration, SNMP supported Integrated Battery Charger Unit, Comba BBU V2 / BBU V3/NG supported License based switching between Class A or Class B, Single band or Dual band, 0.5W or 2W configurations NFPA / IFC / UL 2524 compliant dry contact alarms and built-in visual / audio annunciator Additional external Comba Annunciator Panel supported The following figure shows the enclosure of the PS DAS Master Unit(MU), Expansion Unit(EU) and Remote Unit(RU). Figure 1: Master Unit (MU) ENU STATUS : 1-0-0 Copyright - refer to title page Page 10 INSTALLATION GUIDE FOR DAS Figure 2: Expansion Unit (EU) Figure 3: Remote Unit (RU) End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 11 INSTALLATION GUIDE FOR DAS 2 EQUIPMENT DESCRIPTION 2.1 SYSTEM DIAGRAM Remark: Battery Backup Unit shown as above figure is only used as a reserved port Figure 4: PS DAS Functional Block Diagram In the downlink path, the BTS signals are received by the donor antenna that is connected to the Master Unit. 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 filtered via the duplexer, and then sent to the Expansion Unit(s), the RF signal is converted into an optical signal and then distributed to the Remote Unit(s) to over optical fiber. After amplification by the RU, the signals are transmitted at the MT port to the service antenna infrastructure. In the uplink path, the mobile signals are received by the service antenna. After passing through the MT port duplexer, the signals are sent to the LNA and the integrated module for digital filtering, then the UL signals will be sent to the Expansion Unit(s), the RF signal is converted into an optical signal and then distributed to the Master Unit for filtering by the duplexer and power amplification. Finally, 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 12 INSTALLATION GUIDE FOR DAS 2.3 EQUIPMENT CONSTITUTION The typical PS DAS unit consists of the following components:

Power Amplifier (PA): It provides power amplification for both the UL and DL branches. Main Control Unit (MCU): The MCU is used to monitor and control the operation of the repeater. It also provides the communication interface for remote control and status indication. LED indicators provide the operational 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. 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. Optical module: Completes optical signal and RF signal conversion. 2.4 EQUIPMENT CONNECTORS 2.4.1 PS DAS CONNECTORS The PS DAS is designed for all cable entries to be routed from the right or left of the enclosure, as shown in the following figure. Figure 5: MU Equipment Connectors ENU STATUS : 1-0-0 Copyright - refer to title page Page 13 INSTALLATION GUIDE FOR DAS Table 1: MU 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 uplink test.

*: the antenna is not provided by Comba, the connector type of the system for the antenna is N-

Female. SMA connector for MT port test, -28dB coupling to MT port, available for downlink 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. Coupling port to EU-Uplink Coupling port to EU-Downlink Figure 6: EU Equipment Connectors Table 2: EU Equipment Connectors Identifier Descriptions OP1/OP2 Optical ports UL1 DL1 UL2 DL2 Connect IN1 of MU (Master Unit) Connect OUT1 of MU (Master Unit) Connect IN1 of MU (Slave Unit), this port is only used when the backup function is used Connect OUT1 of MU (Slave Unit), this port is only used when the backup function is used ENU STATUS : 1-0-0 Copyright - refer to title page Page 14 INSTALLATION GUIDE FOR DAS UL_E DL_E Connect to UL1 of next EU for cascade connection Connect to DL1 of next EU for cascade connection Figure 7: RU Equipment Connectors Table 3: RU Equipment Connectors Identifier Descriptions Knock Out OMT OP MT MT_TEST 3/4: For Hybrid cable (include AC cable and monitor cable from BBU) 1: Reserved. 1/2: For Dry contactors or External alarm cables RJ45 Connector for local WEB GUI connection. Optical port, connect to Expansion Unit N-Female connector for connection to service antenna. SMA connector for MT port test, -28dB coupling to MT port, available for both downlink test.

*: the antenna is not provided by Comba, the connector type of the system for the antenna is N-Female. ENU STATUS : 1-0-0 Copyright - refer to title page Page 15 1 1 INSTALLATION GUIDE FOR DAS 2.5 TYPICLA APPLICATION 2.5.1 APPLICATION 1: ONE MU CONNECTS 32 RUS. Figure 8: Application 1 System Diagram ENU STATUS : 1-0-0 Copyright - refer to title page Page 16 OP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EMURU01Optical UnitFiber32Fiber1RU32...RU02FOU01FOU02FOU03FOU04Fiber2RUNFiberN...... INSTALLATION GUIDE FOR DAS 2.5.2 APPLICATION 2: 2 MU (MAIN MU AND BACKUP MU) CONNECT 32 RUS. Figure 9: Application 2 System Diagram 2.5.3 APPLICATION 3: 2MU (MAIN MU AND BACKUP MU) CONNECT 16RUS WITH OPTICAL FIBER BACKUP. Figure 10: Application 3 System Diagram ENU STATUS : 1-0-0 Copyright - refer to title page Page 17 OP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EMain MURU01Optical UnitBackup MUFiber1RU32OP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_EOP1OP2OP3OP4OP5OP6OP7OP8TX1RX1TX2RX2TX1_ERX1_ERU 01Optical UnitEOOptcial switch123Optcial backupFiber2Fiber1Fiber2Fiber1RU 16Main MUBackup MU INSTALLATION GUIDE FOR DAS 2.6 SPECIFICATION OF DAS SYSTEM Specifications Fiber Optic Unit Frequency Band Optical Wavelength Uplink Optical Wavelength Downlink Optical Connector Type Optical Fiber Type VSWR Number of RU supported per FOU Number of FOU supported per MU Number of RU supported per MU MHz nm nm 758 - 869 1310 1550 SC-APC Single Mode, WDM (single strand of fiber per Remote Units) 1.5 Up to 4 or 8 RU per FOU Up to 4 Up to 32 Mechanical Specifications Fiber Optic Unit Dimensions, H x W x D Weight (without bracket) Power Consumption (approx.) 4 Port 8 Port 4 Port 8 Port Power Supply Enclosure Cooling Operating Temperature Operating Humidity Enclosure Class in(mm) lb(kg) lb(kg) W W VDC oF (oC) 18.5 x 15.8 x 3.4 (470 x 400 x 87) 25.4 (11.5) 27.6 (12.5) 15 20

+28 (From Master Unit) Convection

-40 to +131 (-40 to +55) 95%

UL50E Type 4 / NEMA 4 Note: Typical specifications at room temperature RF Specifications System (MU and RU) Passband (Downlink / Uplink) Total Output Power, Uplink Total Output Power, Downlink Maximum System Gain (Uplink /

Downlink) Gain Adjustment Range (1dB step) *

Pass Band Ripple, p-p (Uplink /

Downlink) Uplink Noise Figure MHz dBm dBm dB dB dB dB 700MHz 800MHz 769-775 / 799 805 851-861 / 806-816 27 1 (Master Unit Only) 27/32 1 (Master and Remote Units) 27/321 (Master and Remote Units) 90 90 60-90 / 35-65 / 10-40

(Under different gain limit modes) 60-90 / 35-65 / 10-40

(Under different gain limit modes) S0: 3, S1: 7 S0: 3, S1: 7

<5 (90dB Uplink Gain), <9 (67dB Uplink Gain) Intermodulation dBm

-13

-13 ENU STATUS : 1-0-0 Copyright - refer to title page Page 18 INSTALLATION GUIDE FOR DAS Spurious Maximum RF Input Level without Damage Maximum RF Input Level without Overdrive Input VSWR Impedance dBm dBm dBm FCC Compliance FCC Compliance 0

-10 2 50 0

-10 2 50

*Gain adjusts down to 10dB total gain but is no longer FCC compliant for NF at that level Class A and Specialized Filtering Number of Filters Downlink Number of Filter Uplink Filter Bandwidth Filter High rejection Filter Set Low Delay Filter Set 64 Max per single band 96 Max (shared both bands) for 700/800MHz dual band 64 Max per single band 96 Max (shared both bands) for 700/800MHz dual band Bandwidth

(kHz) 12.5 25 75 KHz 12.5/25/37.5/50/75/100/150**

Delay(s)*

Out-of-Band Suppression 50 (MU Only: 48) 32 (MU Only: 30) 20 (MU Only: 18) 60dBc @ filter edge + 30KHz 60dBc @ filter edge + 50KHz 60dBc @ filter edge + 130KHz 75 LD 17 (MU Only: 15) 60dBc @ filter edge + 200KHz 12.5 25 37.5 50 75 100 150 32 (MU Only: 30) 29 (MU Only: 27) 28 (MU Only: 26) 28 (MU Only: 26) 17 (MU Only: 15) 16 (MU Only: 14) 15 (MU Only: 13) 60dBc @ filter edge + 65KHz 60dBc @ filter edge + 75KHz 60dBc @ filter edge + 75KHz 60dBc @ filter edge + 100KHz 60dBc @ filter edge + 200KHz 60dBc @ filter edge + 200KHz 60dBc @ filter edge + 205KHz

*Actual delay number is various according to version, system delay (MU+RU, including 1m of Fiber)

**BDA does not comply with FCC Class A regulation if any filters that are wider than 75KHz are used. Users must use a Class B FCC Label and register the BDA on FCCs WEB Site. Contact Comba Customer Service for support. Class B Wide Band Filtering Number of Filters Filter Bandwidth System Group Delay Out-of-Band Suppression Mechanical Specification - MU Dimensions, H x W x D Weight (without bracket) Power Supply Input Power Supply Output MHz sec dBc mm / in kg / lbs VAC VDC 3 0.6-10 14 60 @ filter edge + 1MHz 330 x 490 x 199 / 13.0 x 19.3 x 7.8 25 / 55.1 100-240V / 50-60Hz / 0-4.5A 40-60V (Typical: 53.5V) / 0-7.5A DC Output for external devices Typical 53.5V, Floating DC output, Max 100W ENU STATUS : 1-0-0 Copyright - refer to title page Page 19 INSTALLATION GUIDE FOR DAS Maximum Charging Current Power Consumption Enclosure Cooling Main RF Connectors Single Band Dual Band A W 27 dBm

<75

<85 5 33 dBm

<90

<100 Convection N-Female (MT, DT) RF Connectors for Fiber DAS expansion SMA-Female (FOU DL, FOU UL) RF Test Port Dry Contact Alarm Visual Annunciation Dry Contact Alarm Audible Annunciation Communication port Dry Contact Alarm Output External Alarm Input Reserved Knockouts Operating Temperature and Humidity Environmental Class MTBF Mechanical Specification - RU Dimensions, H x W x D Weight (without bracket) Power Supply Input Power Supply Output DC Output for external devices Maximum Charging Current Single Band Dual Band Power Consumption Enclosure Cooling Main RF Connectors RF Test Port Dry Contact Alarm Visual Annunciation Dry Contact Alarm Audible Annunciation Communication port Dry Contact Alarm Output External Alarm Input Reserved Knockouts oC Hr mm / in kg / lbs VAC VDC A W SMA-Female (DT-Test, MT-Test), -28dB coupling Dry Contact Alarm LED 1-8, ALM, RUN (LED test supported) Buzzer (Mute and Lamp Test supported) RJ45 (LAN, OMT) 8 5 (#5 is pre-configured for Door Open Alarm) 3/4-inch hole x 1, 1/2-inch hole x 3, 1-inch hole x2

-40 to +55, 95%

UL50E Type 4 / NEMA 4 100,000 330 x 490 x 199 / 13.0 x 19.3 x 7.8 25 / 55.1 100-240V / 50-60Hz / 0-4.5A 40-60V (Typical: 53.5V) / 0-7.5A Typical 53.5V, Floating DC output, Max 100W 27 dBm

<75

<85 5 33 dBm

<90

<100 Convection N-Female (MT) SMA-Female (MT-Test), -28dB coupling Dry Contact Alarm LED 1-8, ALM, RUN (LED test supported) Buzzer (Mute and Lamp Test supported) RJ45 (LAN, OMT) 8 5 (#5 is pre-configured for Door Open Alarm) 3/4-inch hole x 1, 1/2-inch hole x 3, 1-inch hole x2 Operating Temperature and Humidity Environmental Class MTBF oC Hr

-40 to +55, 95%

UL50E Type 4 / NEMA 4 100,000 ENU STATUS : 1-0-0 Copyright - refer to title page Page 20 INSTALLATION GUIDE FOR DAS 3 INSTALLATION 3.1 WARNINGS AND ALERTS Radio Frequency Energy 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 danger, as far as reasonably practicable. 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 21 INSTALLATION GUIDE FOR DAS 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 22 INSTALLATION GUIDE FOR DAS 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 applications, and panel antenna for outdoor applications. ENU STATUS : 1-0-0 Copyright - refer to title page Page 23 INSTALLATION GUIDE FOR DAS 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 11: Mounting Rack Overview ENU STATUS : 1-0-0 Copyright - refer to title page Page 24 200320330490553?1465 INSTALLATION GUIDE FOR DAS 3.3.4 WALL MOUNTING FOR MU AND RU 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. Fixed the enclosure using six M8 x 25 screws. 4*M10X110 masonry bolt 6*M8 x 25 screws Figure 12: PS DAS (MU and RU) 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. 3.3.6 CABINET MOUNTING FOR EU Installation dimensions of Expansion Unit for cabinet mounting is shown as below:

ENU STATUS : 1-0-0 Copyright - refer to title page Page 25 INSTALLATION GUIDE FOR DAS Figure 13: Dimension of Expansion Unit for Cabinet Mounting Cabinet installation:

The installation cabinet is a standard cabinet. The size of the Expansion Unit is the equipment used in the 2U cabinet. The cabinet needs to have enough space to install the 2U cabinet, and have self-prepared structural parts with pallets and M6 buckle nuts. The installation steps are as follows:

Adjust the 2U space on the upper side of the free pallet of the cabinet, install the square holes on the left and right columns, and install M6 snap nuts in the four holes with a spacing of 76.2mm;

Complete the external wiring connection of the equipment according to the equipment port and wiring requirements;

Push the equipment into the cabinet along the pallet, align the mounting ear mounting holes of the equipment with the corresponding square holes of the cabinet [with M6 nuts], and use a "cross screwdriver" to set the " M6" in the packing box of the equipment 10, "Combination screw (T)" passes through the hanging ears and fastens to the

"M6 snap nut";

Use the yellow-green ground wire in the accessories to reliably connect the equipment ground terminal and the ground bar of the machine room;

The installation is complete. ENU STATUS : 1-0-0 Copyright - refer to title page Page 26 INSTALLATION GUIDE FOR DAS Figure 14: Expansion Unit Cabinet Mounting 3.3.7 WALL MOUNTING FOR EU Installation dimensions of Expansion Unit for wall mounting is shown as below:

The wall-mounted installation steps are as follows:

Figure 15: Expansion Unit Wall Mounting ENU STATUS : 1-0-0 Copyright - refer to title page Page 27 INSTALLATION GUIDE FOR DAS Remove the two mounting hangers from the Expansion Unit, adjust the direction according to Figure 9, and install it on the Expansion Unit. At the same time, install the remaining two mounting hangers attached in packing box on the Expansion Unit, as shown in Figure 16;

Figure 16: The mounting hangers of Expansion Unit On the selected wall, use a percussion drill and choose a suitable drill bit [8mm is recommended] to make a hole according to the size [465*246.5mm] in Figure 17, and the depth is about 50mm;

Figure 17: Hole punching diagram for Wall-mounted installation Remove the nut and washer of "M660, expansion bolt", insert the bolt and sleeve into the hole of the wall [the threaded end faces outward]; then hang the device on the bolt, and then pad it Use a wrench to tighten the screws for flat pads and spring pads, as shown in Figure 18;

Use the yellow-green ground wire in the accessories to reliably connect the equipment ground terminal and the ground bar of the machine room;

ENU STATUS : 1-0-0 Copyright - refer to title page Page 28 INSTALLATION GUIDE FOR DAS The installation is complete. Figure 18: Expansion Unit Wall Mounting ENU STATUS : 1-0-0 Copyright - refer to title page Page 29 INSTALLATION GUIDE FOR DAS 3.3.8 GROUNDING 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 systems (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). 3.3.9 AC/DC POWER CONNECTION FOR MU Figure 19: AC/DC power connection for MU BATT- of MU connect BATT- of BBU BATT+ of MU connect BATT+ of BBU ENU STATUS : 1-0-0 Copyright - refer to title page Page 30 INSTALLATION GUIDE FOR DAS AC IN port (PE, N, L) Connect AC OUTPUT port (PE, N, L) 3.3.10 AC/DC POWER AND MONITOR CABLE CONNECTION BETWEEN MU AND EU Backup MU Backup MU Backup MU Figure 20: DC power and Monitor cable connection for EU The power supply of the Expansion Unit is DC24V-DC48V, which can be directly supplied by the MU or DC48V independently. When powered by the MU, the FOU port of Main MU provides the DC power to EU: +28VIN1+, GNDIN1-;

Switch Cable connection: Main MUEU: SWSW1;

Backup MU: SWSW2;

RJ45 Cable connection: Main MUEU: AUXAUX1; Backup MUEU: AUXAUX2. ENU STATUS : 1-0-0 Copyright - refer to title page Page 31 INSTALLATION GUIDE FOR DAS 3.3.11 DC POWER AND MONITOR CABLE CONNECTION BETWEEN EU AND EU Figure 21: DC power and Monitor cable connection for EU Power Cable(EU1 to EU2)OUT+IN1+OUT-IN1-

Monitor Cable(EU1 to EU2)ADD_OUTADD_IN RJ45 Cable(EU1 to EU2)AUX3AUX1 3.3.12 RF CABLE CONNECTION PS DAS RF cables connection is as follows:

PS DAS MU DT/DL IN port Connects to the feeder cable from the donor antenna. PS DAS MU MT/DL OUT port Connects to the feeder cable from the service antenna infrastructure. PS DAS MU IN1/OUT1 ports Connects to UL1/DL1 or UL2/DL2 of EU PS DAS RU MT port Connects to the feeder cable from the service antenna infrastructure. 3.3.13 WEB ACCESS Connect OMT or LAN using regular Ethernet cable, then use the correct IP address in the browser to access to the WEB GUI 3.3.14 DRY CONTACT CABLE Below please find the pin definitions of Dry Contact Cables. Table 4: Pin Definition of Dry Contact Cable Pin NO. Pin Input ALM1 ENU STATUS : 1-0-0 Copyright - refer to title page Page 32 Power CableMonitor CableRJ45 Cable EU 1 EU 2 INSTALLATION GUIDE FOR DAS CLOSE1 COM1 OPEN1 CLOSE2 COM2 OPEN2 CLOSE3 COM3 OPEN3 CLOSE4 COM4 OPEN4 CLOSE5 COM5 OPEN5 CLOSE5 COM5 OPEN5 EXT ALM1 EXT ALM2 EXT ALM3 EXT ALM4 GND GND GND GND NC ALM2 AUX 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 Dry contact status:

Main Power Normal/Lost dry contact status:

ENU STATUS : 1-0-0 Copyright - refer to title page Page 33 INSTALLATION GUIDE FOR DAS Pin definition of ALM and AUX connectors:

End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 34 INSTALLATION GUIDE FOR DAS 4 WEB GUI The PS DAS can be monitored and controlled via the WEB GUI; use the following guide to finish system parameter setting and commissioning. 4.1 WEB GUI CONNECTION Step 1: Connect the OMT port to the PC RJ45 port OF MU with the supplied RJ45 cable to set up a physical connection. Step 2: Open a browser (suggested is the Firefox browser, display resolution is 1024768), input Web GUI IP address:

https://192.168.8.101, click [Enter]. NOTE: DHCP and DNS are also available to login to the Web GUI. Figure 22: Input IP Address Step 3: Input User Name: admin; Password (default password: admin). Click [Log in]. Figure 23: Input User Name and Password ENU STATUS : 1-0-0 Copyright - refer to title page Page 35 INSTALLATION GUIDE FOR DAS 4.2 WEB GUI INTRODUCTION After log in, the Web GUI main screen will appear. Figure 24: Web GUI Main Screen On Comba Web GUI Home Screen, there are four Menu bars:

[Dashboard], [Overview], [Tools], [Device]and [Management]. The [Dashboard] Screen shows system topology diagram. Dashboard Screen Figure 25: Dashboard Screen The [Tools] shows Commission, Scan Device, Reset, etc. Commission screen The page shows Channel Frequency Information ENU STATUS : 1-0-0 Copyright - refer to title page Page 36 INSTALLATION GUIDE FOR DAS The page shows Sub Band Information. Figure 26: Chanel Frequency Info Figure 27: Sub Band Info End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 37 INSTALLATION GUIDE FOR DAS 5 COMMISSIONING 5.1 PRE-COMMISSIONING TASKS After equipment installation, perform the following steps before equipment powering and commissioning:

Prepare the channel frequencies. 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 frequencies is less than -14dB (VSWR<1.5). 5.2 COMMISSIONING PROCEDURE Perform the following procedures for system commissioning. Commissioning Tasks Observation Table 5: Commissioning Task Explanation 1. Set filter frequencies 2. Go through commissioning process 3. Turn on 700/800MHz switches, turn on filter switches 4. Determine system downlink gain and uplink gain for each filter In Master Unit Device page or on each individual units page Update the frequency for each filter in the device page In Master Unit Commissioning page Scan system elements Update units information Isolation test Uplink Calibration Downlink Calibration In Master Unit Device page or on each individual units page Turn on the switches for 700/800MHz and switches for each filter In Master Unit Device page Determine and set the downlink or uplink gain based on the downlink input power / the link budget calculation or the design 5. Fine tuning the gain In each individual units page You must fine tune the gain individually on each unit 6. Alarm Setting Review In Master Unit Management page or on each individual units page Review the alarm setting for Donor Antenna monitoring, and for dry contact alarms End of Section ENU STATUS : 1-0-0 Copyright - refer to title page Page 38 INSTALLATION GUIDE FOR DAS 6 MAINTENANCE The PS DAS 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 PS DAS 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 39 INSTALLATION GUIDE FOR DAS 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 40 INSTALLATION GUIDE FOR DAS 7.2 APPENDIX B: DECLARATION OF HARMFUL SUBSTANCES AND CONTENT Product Name: Public Safety DAS System Harmful substance and content of this product as below table shown:

Part Name A B Pb Harmful Substance 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 41 INSTALLATION GUIDE FOR DAS 7.3 APPENDIX D: RMA (RETURN MATERIAL AUTHORIZATION) ENU STATUS : 1-0-0 Copyright - refer to title page Page 42 INSTALLATION GUIDE FOR DAS ENU STATUS : 1-0-0 Copyright - refer to title page Page 43

Comba RH78V3-B Public Safety DAS S/N:

ERP#:

P/N:

Comba Telecom Network Systems Limited Comba Model No.: RH78V3-B FCC ID: PX8RH78V3-B This is a 90.219 class B device complies with FCC part 90 signal booster rules. www.comba-telecom.com Comba Telecom Network Systems Limited Comba 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. 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. Comba Telecom Network Systems Limited

Comba Telecom Network Systems Limited Authority to Act as Agent Date: June 8, 2023 American Certification Body, Inc. 6731 Whittier Avenue Suite C110 McLean, VA 22101 To Whom It May Concern:

Grg Metrology & Test Group 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: ____2024/5/30_____ By:

(Signature1) Ronin Gong

(Print name) Title:

Director On behalf of: _Comba Telecom Network Systems Limited

(Company Name) Telephone:+86 (020) 2839 00 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.

Comba Telecom Network Systems Limited Certification Application Attestation Statements Date: June 8, 2023 American Certification Body, Inc. 313 Park Avenue Suite 300 Falls Church, VA 22046 To Whom It May Concern:

Statement for 47 CFR section 2.911(d)(5)(i) ______Comba Telecom Network Systems Limited______ certifies that as of the date of the application the equipment for which authorization is sought is not covered equipment1 prohibited from receiving an equipment authorization pursuant to section 2.903 of the FCC rules. If the equipment for which the applicant seeks authorization is produced by any of the entities identified on the current Covered List, including affiliates or subsidiaries of the named companies, the applicant must include an explanation on why the equipment is not covered equipment. Additional Explanation: <N/A>

Statement for 47 CFR section 2.911(d)(5)(ii) ____Comba Telecom Network Systems Limited______ (the applicant) certifies that, as of the date of the filing of this application, the applicant - is / - is not identified on the Covered List as an entity producing covered equipment. Thank you, By:

(Signature2) ______Ronin Gong_____

(Print name) Title:

____Director_______ Company:

Telephone:

_Comba Telecom Network Systems Limited__ ___+86 2028390000_______________________ 1 - The Commissions Covered List is published by the Public Safety and Homeland Security Bureau and posted on the Commissions website. This Covered List, which is periodically updated, identifies particular equipment, produced by particular entities, that constitutes covered equipment. https://www.fcc.gov/supplychain/coveredlist . 2 - Letters should be placed on appropriate letterhead. 012423-17 rev2

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: PX8RH78V3-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: PX8RH78V3-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. The PS BDA can be configured as Class B (FCC ID: )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, 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 DAS Model: RH78V3-B is authorized frequencies below:

700MHz:Downlink769MHz ~ 775MHz, Uplink: 799MHz ~ 805MHz 800MHz: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 2023/6/8

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

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 Request for Confidentiality Date: June 8, 2023 Subject: Confidentiality Request for: __PX8RH78V3-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

U.S. Agent Designation for Service of Process

(Applicant and U.S. Agent are Separate Parties) TO: American Certification Body, Inc. 313 Park Avenue Suite 300 Falls Church, VA 22046 ATTENTION: FCC Certification Section 2.911(d)(7) Information Designated U.S. Agent Company Name: Comba Telecom Contact Name: Matthew Lunny Street Address: 568 Gibraltar Drive, Milpitas, CALIFORNIA City/Province/Zip: Milpitas Telephone No: 214 250 2658 Email: mlunny@combausa.com This letter is to confirm that we (the Designated U.S. Agent) have accepted the responsibility to act as the Designated U.S. Agent for Service of Process as required by section 47 CFR 2.911(d)(7) on behalf of the Applicant noted below. U.S. Agent Signature:

Date: June 8, 2023 Signed by (Printed Name/Title): Matthew Lunny The Applicant acknowledges that they must maintain an agent for no less than one year after terminating all marketing and importation OR the conclusion of any Commission-

related proceeding involving the equipment. The applicant further acknowledges their responsibility to inform the FCC whenever the Designated U.S. Agent information above changes. Applicant Company name:Comba Telecom Network Systems Limited Grantee Code:PX8 Contact Name:Ronin Gong Street Address: Flat/Rm 10, 3/F, BioInformatics Ctr, 2 Science Park West Avenue, HK Science Park, Pak Shek Kok, N.T. City/Province/Zip:Hong Kong Telephone No:+86 2028390000 Email:gongwei@comba-network.com Applicant Signature1:

Date: June 8, 2023 Signed by (Printed Name/Title):Ronin Gong/Director 1 - Letters should be placed on appropriate letterhead.