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COMBA COMFLEX Series User Manual

Distributed antenna system
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USER MANUAL FOR COMFLEX-6Q00 5W
COMFLEX-6Q00 5W
COMFLEX SERIES
DISTRIBUTED
ANTENNA SYSTEM
USER MANUAL
COMFLEX-6Q00 5W QE 1-0-1
编 制： _ _ 林怀佳 __
审 核： __ 曹 松 __
会 签： ___ 周 明__ _
标准化：___ 许 婷____
批 准： _ __付俊涛__ _
京信通信系统（中国）有限公司

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  • Page 1 USER MANUAL FOR COMFLEX-6Q00 5W COMFLEX-6Q00 5W COMFLEX SERIES DISTRIBUTED ANTENNA SYSTEM USER MANUAL COMFLEX-6Q00 5W QE 1-0-1 编 制： _ _ 林怀佳 __ 审 核： __ 曹 松 __ 会 签： ___ 周 明__ _ 标准化：___ 许 婷____ 批 准： _ __付俊涛__ _...
  • Page 2 USER MANUAL FOR COMFLEX-6Q00 5W 文件历史记录 文件编号 COMFLEX-6Q00 5W QE COMFLEX SERIES DISTRIBUTED ANTENNA SYSTEM 文件标题 MANUAL 文件履历 版本 编制 日期 更改内容（条款） 林怀佳 首次发行 2018-06-21...
  • Page 3 USER MANUAL FOR COMFLEX-6Q00 5W ComFlex-6Q00 5W DISTRIBUTED ANTENNA SYSTEM USER MANUAL ComFlex-6Q00 5W QE: 1-0-1 Comba Telecom Inc. ENU STATUS: 1-0-1 Copyright - refer to title page Page 3...
  • Page 4 The information contained herein is the responsibility of and is approved by the following, to whom all enquiries should be directed in the first instance: This is an unpublished work the copyright in which vests in Comba International ("Comba"). All rights reserved.

  • Page 5: Table Of Contents

    USER MANUAL FOR COMFLEX-6Q00 5W CONTENTS Section Page CONTENTS ................................3 INDEX TO FIGURES AND TABLES ..........................4 HISTORY .................................. 6 GLOSSARY OF TERMS ............................. 7 SAFETY NOTICES AND ADMONISHMENTS ......................8 GENERAL INFORMATION ..........................10 EQUIPMENT DESCRIPTION .......................... 12 SYSTEM DIAGRAM ...............................

  • Page 6: Index To Figures And Tables

    USER MANUAL FOR COMFLEX-6Q00 5W INDEX TO FIGURES AND TABLES Figure 1: Master Unit (MU) ............................10 Figure 2: Remote Unit (RU) ............................11 Figure 3: System Diagram ............................. 12 Figure 4: Typiccal SISO Application ..........................12 Figure 5: ComFlex Master Unit ............................. 19 Figure 6: RF Unit Installation ............................
  • Page 7 USER MANUAL FOR COMFLEX-6Q00 5W Figure 55: Function – After Scan..........................50 Figure 56: Function - Device Remove......................... 51 Figure 57: Function - New Site Report ........................52 Figure 58: Function - PA Reset ............................ 52 Figure 59: Function - Device Reset ..........................53 Figure 60: Function - Clear History Alarm ........................

  • Page 8: History

    USER MANUAL FOR COMFLEX-6Q00 5W HISTORY Change No. Details of Change 1-0-0 Initial released in Jun 2018. 1-0-1 Deleted MIMO related description. ENU STATUS: 1-0-1 Copyright - refer to title page Page 6...

  • Page 9: Glossary Of Terms

    USER MANUAL FOR COMFLEX-6Q00 5W GLOSSARY OF TERMS Automatic Level Control Attenuation Bi-direction Amplifier Base Station Base Transceiver Station Downlink Donor Terminal Fiber Optical Unit Graphic User Interface Identification Low Noise Amplifier Main Control Unit Mobile Terminal MTBF Mean Time Between Failures Master Unit Normally Closed Noise Figure...

  • Page 10: Safety Notices And Admonishments

    USER MANUAL FOR COMFLEX-6Q00 5W 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.
  • Page 11 USER MANUAL FOR COMFLEX-6Q00 5W 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.

  • Page 12: General Information

    USER MANUAL FOR COMFLEX-6Q00 5W 1 GENERAL INFORMATION The ComFlex-6Q00 Series Distributed Antenna System (hereinafter called “ComFlex”) consists of Master Unit (MU) and Remote Unit (RU). The MU includes the MU Chassis, Power Supply Unit (PSU), Fiber Optical Unit (FOU) and RF Unit (RFU). With a modular design, it can support up to 8 independent RF inputs and 8 Remote Units.
  • Page 13 USER MANUAL FOR COMFLEX-6Q00 5W Figure 2: Remote Unit (RU) End of Section ENU STATUS: 1-0-1 Copyright - refer to title page Page 11...

  • Page 14: Equipment Description

    USER MANUAL FOR COMFLEX-6Q00 5W 2 EQUIPMENT DESCRIPTION SYSTEM DIAGRAM Figure 3: System Diagram On the DL, signals from the BTSs or BDA are converted into optical signals after amplification in the MU.Then the optical signals are transmitted to the RU via optical fiber. The Optical TX/RX Module of RU converts the DL optical signals into RF signals.

  • Page 15: Equipment Constitution

    USER MANUAL FOR COMFLEX-6Q00 5W EQUIPMENT CONSTITUTION MU consists of the following parts: Table 1: MU Components Module Description Master Unit Chassis includes eight slots for RF Unit, two slots for Fiber Optical MU01-RACK Unit, and one slot for Power Supply Unit. iDAS Master Unit Power Supply Unit (PSU) converts the input voltage into stable MU01-PSU DC to supply power for other modules of Master Unit.

  • Page 16: Kit Of Part

    USER MANUAL FOR COMFLEX-6Q00 5W KIT OF PART Table 3: Master Unit (MU) KOP Item Image MU Chassis RF Unit (RFU) Fiber Optical Unit (FOU) Power Supply Unit (PSU) Power Supply Cable (13 Feet 1 inch) Communication Cable Right Angle Bracket (for MU 19“rack mounting) Left Angle Bracket (for MU 19“...
  • Page 17 USER MANUAL FOR COMFLEX-6Q00 5W Table 4: Remote Unit (RU) KOP Item Image Remote Unit RU Power Supply Unit (with1 foot 9 inches. DC cable and 13 feet 1 inch AC cable ) Mounting Rack (for RU wall mounting) Masonry Bolt (set) M8x80 ( for RU concrete wall mounting) Masonry Bolt (set) M8x80 (for PSU concrete wall mounting)

  • Page 18: Installation

    USER MANUAL FOR COMFLEX-6Q00 5W 3 INSTALLATION WARNINGS AND ALERTS Laser Laser light can cause damage to eyes. Laser light is not visible. Viewing it directly does not cause pain. The iris of the eye will not close when viewing a bright light. Consequently, serious damage to the retina of the eye is possible.

  • Page 19: Site Planning Considerations

    USER MANUAL FOR COMFLEX-6Q00 5W SITE PLANNING CONSIDERATIONS 3.2.1 SITE PLANNING Site Considerations The MU is designed to be located indoors to facilitate coupling of BTS signals and power supply connections. The input range of MU RF unit is 10~30 dBm. The site consideration for RU is listed below: ...

  • Page 20: Installation Procedures

    Without documentary evidence, a claim cannot be processed. Open and check each package against the packing list. For any shortage, contact Comba Telecom Systems. Do not remove items from packing materials until installation.
  • Page 21 USER MANUAL FOR COMFLEX-6Q00 5W Fiber optic cables require proper handling. Do not stretch, puncture, or crush the fiber cable(s) with  staples, heavy equipment, doors, etc. Always maintain the minimum bending radius specified by the cable manufacturer. The minimum ...
  • Page 22 USER MANUAL FOR COMFLEX-6Q00 5W Step2: FOU installation: Remove FOU slot cover plate on Chassis, insert FOU and fasten the screws. (Each Unit can be installed in either one of two FOU slots) Figure 7: FOU Installation Step3: PSU installation: Remove PSU slot cover plate on the right side of Chassis, insert PSU and fasten the screws.
  • Page 23 USER MANUAL FOR COMFLEX-6Q00 5W Step4: Backup PSU installation (Optional): 1) install 2 M4 x 10 bolt kits in the back of MU; 2) hang the backup PSU on the bolts, then use another 4 M4 x 10 bolts kits to fasten the PSU; 3) .Fix cable clip, connect output cable and ground cable to MU.
  • Page 24 USER MANUAL FOR COMFLEX-6Q00 5W Figure 10: Mounting Rack Figure 11: Angle Iron Installation ENU STATUS: 1-0-1 Copyright - refer to title page Page 22...
  • Page 25 USER MANUAL FOR COMFLEX-6Q00 5W Step2: Slide the MU on to the angle brackets and confirm it is level. Figure 12: MU Installation Step 3: Attach the MU onto the rack with the recommended rack screws. Figure 13: Secure the Enclosure ENU STATUS: 1-0-1 Copyright - refer to title page Page 23...
  • Page 26 USER MANUAL FOR COMFLEX-6Q00 5W Step 4: Finish installation. Figure 14: Finish Installaiton 3.3.6 RU WALL MOUNTING RU wall mounting steps are shown below. Step 1: Select the wall mount location according to the following criteria:  General surroundings  If mounting on dry wall, 0.75 In (min) plywood backboard is required to support the weight of the equipment.
  • Page 27 USER MANUAL FOR COMFLEX-6Q00 5W 6.65 in. (169mm) Figure 15: Wall Drilling Dimensions of MRU Step 3: Attach the mounting rack on a wall. If a concrete wall, use the 2 M8×80 masonry bolts. (Bolts are provided; lag bolts or screws are not provided for plywood mounting) Two M8×80 masonry bolt Figure 16: Install Mounting Rack on the Wall...
  • Page 28 USER MANUAL FOR COMFLEX-6Q00 5W Step 4: Ensure the antenna and other connectors are facing down, hang RU onto semicircle slot of mounting rack. Figure 17: Hang RU onto the Mounting Rack Step 5: Tighten the bottom two M8×80 masonry bolts on RU. Two M8×80 masonry bolt Figure 18: Tighten the Screws at the Bottom of RU...
  • Page 29 USER MANUAL FOR COMFLEX-6Q00 5W Step 6: Tighten M6×20 hexagon screws on the left and right sides of RU to fasten it with mounting rack. M6×20 hexagon screws Figure 19: Tighten Two Hexagon Screws 3.3.7 PSU INSTALLATION RU Power Supply Unit should be installed after the RU is mounted. RU Power Supply Unit can be installed in two ways –...
  • Page 30 3.3.8 DRIP-LOOP Comba recommends that every horizontal cable entry to the equipment forms a 'U' before it’s entry to the equipment. Any accumulated water on the cable will drip down at the bottom of the loop and will not climb up to the equipment.

  • Page 31: Equipment Connectors

    USER MANUAL FOR COMFLEX-6Q00 5W EQUIPMENT CONNECTORS The figures below present the connectors of ComFlex MU. Figure 23: MU Front Panel Connectors Figure 24: MU Rear Panel Connectors ENU STATUS: 1-0-1 Copyright - refer to title page Page 29...
  • Page 32 USER MANUAL FOR COMFLEX-6Q00 5W Table 5: MU Connections Identifier Functional Description 1. OP1~OP4 SC/APC optical fiber access port 2. LED indicator LED indicator. See Chapter 4 for the description of each indicator. 3. BTS_ALM DB9-F connector for BTS alarm. 4.
  • Page 33 USER MANUAL FOR COMFLEX-6Q00 5W TX_EXT EXT_ALM RS-485 DC 28V RX_EXT TEST Figure 26: RU Connectors Table 6: RU Connections Identifier Functional Description 4.3-10 connector, antenna system connection port SC/APC optical fiber access port EXT_ALM External alarm port. It provides an alarm report interface for other devices to report their alarms to CMS.

  • Page 34: Equipment Connection

    USER MANUAL FOR COMFLEX-6Q00 5W EQUIPMENT CONNECTION 3.5.1 GROUNDING CONNECTION WARNING! This unit must always be grounded. Consult an appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available. Do not connect power before grounding. 3.5.2 MU GROUNDING CONNECTION Step 1: Connect the GND cable to the GND connector and the building EARTH.
  • Page 35 USER MANUAL FOR COMFLEX-6Q00 5W Figure 28: RU Grounding 3.5.4 MU CONNECTIONS Step1: Connect the MU OP (optical) port to one of the RU OP port. (NOTE: requires Single Mode fiber with SC/APC connectors; MAXIMUM OPTICAL LOSS = 6.5dBo) Step 2: For duplex application, connect the MU RFU TX/RX port to the RF Source (BTS or BDA) using 50Ohm coaxial cable.
  • Page 36 USER MANUAL FOR COMFLEX-6Q00 5W Step 3: Connect the power cable to the power supply port (100-240VAC, 1Amp maximum). Figure 30: MU Power Connection (Rear Panel) 3.5.5 RU CONNECTION Step 1: Connect the RU OP (optic) port to one of the OP port located on MU FOU front panel. Step 2: Connect ANT port to a broadband antenna using 50Ohm coaxial cabel.
  • Page 37 USER MANUAL FOR COMFLEX-6Q00 5W AC 100V-240V 50Hz/60Hz DC 28V Figure 32: PSU Power Port Connection 3.5.6 RU EXTERNAL ALARM CONNECTION For RU, this is a 4-pin connector. The following figure and table show the pin allocation and definition. Pin numbering are shown looking-into the connector on the enclosure.

  • Page 38: Commissioning

    USER MANUAL FOR COMFLEX-6Q00 5W BTS_OPEN BTS_ COM BTS_CLOSE Figure 34: Pins Allocation for “BTS_ALM” Port Table 8: Pin Definition of “BTS_ALM” Port Pin Number Definition Description BTS_OPEN Connects to the open terminal of the voltage free relay. BTS_COM Connects to the common terminal of the voltage free relay. BTS_CLOSE Connects to the close terminal of the voltage free relay.

  • Page 39: Led Indicators

    USER MANUAL FOR COMFLEX-6Q00 5W LED INDICATORS Diagnostic LEDs are located on the MU front panel and RU bottorm panel; each indicates the status of a particular function: Table 9: MU LED Indications LED Indicator Normal Status Indication Power indicator. If LED is off, it indicates the system Steady green has no power.

  • Page 40: Digital Display On Fou

    USER MANUAL FOR COMFLEX-6Q00 5W Table 11: RFU Digital Display Figure DL Input Power Level < -19dBm -19~33 -19~33dBm > 33dBm 4.3.2 DIGITAL DISPLAY ON FOU The digital display tube on optical module has two digits. The first digit will display A, b, C and d which presents the No. of optical port. Refer to below figure for the relationship.

  • Page 41: Web Gui

    USER MANUAL FOR COMFLEX-6Q00 5W 5 WEB GUI ComFlex can be monitored and controlled by WEB GUI, follow below contents to achive system parameter setting and commissioning. WEB GUI CONNECTION Step 1: Connect MU OMT port to PC RJ45 port with the supplied Ethernet cable to set up a physical connection.

  • Page 42: Web Gui Introduction

    After login, the Web GUI main screen will appear. Figure 40: Web GUI Main Screen On Comba Web GUI Home page, there are three Menu bars: [Home], [Auto Setup] and [Function]. ENU STATUS: 1-0-1 Copyright - refer to title page...

  • Page 43: Home]

    USER MANUAL FOR COMFLEX-6Q00 5W 5.2.1 [HOME] The [Home] page shows the actual connection diagram of MU and RU. Click here for FOU main management page Click here for MU main management page Click here for RFU main management page Click here for RU main management page...
  • Page 44 USER MANUAL FOR COMFLEX-6Q00 5W Optical Unit Management Screen Click here to enable/disable optical RX/TX alarm FOU port number Optical loss between MU and RU, the value is over 16dB when MU and RU are Optical power alarm. Alarm is not connected well triggered when optical power is less than -10dBm.
  • Page 45 USER MANUAL FOR COMFLEX-6Q00 5W Remote Unit Management Screen Click RU photo, users can visit RU directly. Make sure two steps are done before visit RU: RU and MU are connected by optical fiber.  RU device scanning is done. Note: Go to [Commissioning] page or [Management] page for device ...

  • Page 46: Auto Setup]

    USER MANUAL FOR COMFLEX-6Q00 5W 2500MHz RF parameter setting table 2500MHz alarm Select 2500MHz band information and configuration table Figure 46: RU Device – 2500MHz 5.2.2 [AUTO SETUP] A work flow of the commissioning process is shown on [Auto Setup] page. Click the [Start] button, the software will guide you through the commissioning step by step.

  • Page 47: Function]

    USER MANUAL FOR COMFLEX-6Q00 5W 5.2.3 [FUNCTION] Other parameters can be configured on [Function] page. There are fifteen function bars list in the left side of the [Mangement] page. Below figures are the introduction of each function bar.  Devic Info. Figure 48: Function - Device Info.
  • Page 48 USER MANUAL FOR COMFLEX-6Q00 5W  Import&Export Figure 49: Function - Import&Export Below table list the parameters that can be import/export: Table 13: Import/Export Parameters Device Paremeter Device Parameter Alarm Enable Alarm Enable ATT value ATT value RF Switch RF Switch SNMP parameter Over temperature alarm threshold DL over output power threshold...
  • Page 49 USER MANUAL FOR COMFLEX-6Q00 5W  Summary Figure 50: Function - Summary  Comm. Setting Figure 51: Function - Comm. Setting (SNMP) ENU STATUS: 1-0-1 Copyright - refer to title page Page 47...
  • Page 50 USER MANUAL FOR COMFLEX-6Q00 5W Figure 52: Function - Comm. Setting (UDP)  IP Setting Figure 53: Function - IP Setting ENU STATUS: 1-0-1 Copyright - refer to title page Page 48...
  • Page 51 USER MANUAL FOR COMFLEX-6Q00 5W Note: For remote monitoring, the IP Address must be set correctly according to the location IP of remote connection. If there is more than one equipment is connected to the public network through the same router, the router’s local IP CANNOT be set as 192.168.8.*.
  • Page 52 USER MANUAL FOR COMFLEX-6Q00 5W  Scan Figure 54: Function - Scan Figure 55: Function – After Scan ENU STATUS: 1-0-1 Copyright - refer to title page Page 50...
  • Page 53 USER MANUAL FOR COMFLEX-6Q00 5W  Device Remove Figure 56: Function - Device Remove Note: If the RU has been scanned and identified by MU, to remove the RU from the system,users must remove this RU on this [Remove] page, otherwise, RU will still be shown on the Home page and will trigger optical alarm.
  • Page 54 USER MANUAL FOR COMFLEX-6Q00 5W  New Site Report Figure 57: Function - New Site Report  PA Reset Figure 58: Function - PA Reset Note: PA will be turned off by software when PA output power or (VSWR) reflected power is exceed the threshold.
  • Page 55 USER MANUAL FOR COMFLEX-6Q00 5W  Device Reset Figure 59: Function - Device Reset Note: Device Reset process will last about 2~4 minutes. For MU monitor reset, users need to re-login WEB GUI.  Clear History Alarm Figure 60: Function - Clear History Alarm ENU STATUS: 1-0-1 Copyright - refer to title page Page 53...
  • Page 56 USER MANUAL FOR COMFLEX-6Q00 5W  Firmware There are three functions on the [Firmware] bar: [Monitoring Upgrade], [Swap] and [Module Upgrade]. [Monitoring Upgrade] is used to upgrade software. [Swap] is to replace current firmware version to the previous one. [Module Upgrade] is used to upgrade module software. Master unit Master Unit Slaver Unit...

  • Page 57: Commissioning Procedure

    USER MANUAL FOR COMFLEX-6Q00 5W  WebOMT Setting Figure 63: Function – WebOMT Setting COMMISSIONING PROCEDURE To complete the installation and commissioning, users need to follow the steps below. Step 1: Click Menu bar [Auto Setup] on home page, a work flow will show up. Figure 64: Commissioning Procedure - Start ENU STATUS: 1-0-1 Copyright - refer to title page...
  • Page 58 USER MANUAL FOR COMFLEX-6Q00 5W Step 2: Click to start RU device scan, this step will take about 1 minute. Figure 65: Commissioning Procedure - Device Scan Step 3 Go to [Home] page, click RU, config the Working Mode of 2500 TDD to DL Normal Open. Figure 66: Commissioning Procedure –...
  • Page 59 USER MANUAL FOR COMFLEX-6Q00 5W Figure 67: Commissioning Procedure - Params Setting Dev Info mainly used to record device location and Date/Time provid a time reference. Mouse clicks the Config Value of Date/Time to auto receive the computer time. Step 5: Click to enter to the page to select folw to continue.
  • Page 60 USER MANUAL FOR COMFLEX-6Q00 5W Note: Calibration is to adjust MU and RU gain to make sure system gain is normal, if the band have been calibrated, users can click to skip the process; if the band never been calibrated, users click in the step of Calibration, software can still procede to the next step of MU and RU setup, but the system gain will be a little deviation with normal valuer, so the final output power will be not same with the target DL output power.
  • Page 61 USER MANUAL FOR COMFLEX-6Q00 5W Step 7: Click "Calibrate” and click “OK” to start the Calibratiion procedure, Figure 71. Figure 70: Commissioning Procedure - Calibration Automatic calibration no needs to select frequency band, the system will calibration all the  band automatically.
  • Page 62 USER MANUAL FOR COMFLEX-6Q00 5W Step 8: After Calibration is finished, go to MU Setup as in Figure 72, then RU Setup shown in Figure 73 Figure 71: Commissioning Procedure – MU Setup Note: RU Setup includes “Remark”, “RF Switch”, “DL Input Power”. Figure 72: Commissioning Procedure –...
  • Page 63 USER MANUAL FOR COMFLEX-6Q00 5W Note: As the system calibration process is calibrated for single channel, so if there is more than one same band input, because of the power superposition, the band total output power will higer than target DL output power after the calibration is complete.

  • Page 64: Alarms And Troubleshooting

    USER MANUAL FOR COMFLEX-6Q00 5W 6 ALARMS AND TROUBLESHOOTING ALARMS Table 14: MU Alarm List Alarm List Alarm Condition  Alarm when equipment temperature is higher than the threshold, otherwise normal; Over-Temperature  Alarm judgment period: 3 minutes by default; Alarm Alarm threshold : 80℃...
  • Page 65 USER MANUAL FOR COMFLEX-6Q00 5W Table 15: RU Alarm List Alarm List Alarm Condition Alarm status when the external terminals have different H/L level with alarm  External Alarm level, otherwise normal; Alarm period: 10s by default.  Alarm when equipment temperature is higher than the threshold, otherwise ...

  • Page 66: Troubleshooting

    USER MANUAL FOR COMFLEX-6Q00 5W TROUBLESHOOTING Following installation and commissioning, occasional operation tasks to handle alarms may be required: Table 16: MU Alarms Diagnosis Alarm condition Diagnosis Check temperature on WEB GUI  Over- Temperature If device temperature is over threshold, make sure environment temperature is within the ...
  • Page 67  Reset PA, if PA service status turns to [Recovery], and then refer to DL PA Alarms. If PA still shutdown, the PA module maybe damaged, please contact with Comba to replace the RU. LNA Alarm Uplink LNA modual damaged, please contact with Comba to replace the RU.

  • Page 68: Appendices

    USER MANUAL FOR COMFLEX-6Q00 5W 7 APPENDICES APPENDIX A: TOOLS FOR INSTALLATION AND MAINTENANCE The following tools (not included in package) are required for installation or routine maintenance:  Power Drill (for wall mount)  Adjustable Wrench (0.31 inch~0.79 inch) ...

  • Page 69: Appendix B: Rma (Return Material Authorization)

    USER MANUAL FOR COMFLEX-6Q00 5W APPENDIX B: RMA (RETURN MATERIAL AUTHORIZATION) End of Section End of Document FOR NAM OFFICE EMAIL, PLEASE INSERT: support.us@comba-telecom.com ENU STATUS: 1-0-1 Copyright - refer to title page Page 67...
  • Page 70 USER MANUAL FOR COMFLEX-6Q00 5W ENU STATUS: 1-0-1 Copyright - refer to title page Page 68...

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