Users Manual 082019

FCC ID: 2AG32MBS31001

Users Manual

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FCCID_4447219

Nova-436Q Outdoor LTE Base Station Installation Guide 01 All rights reserved © Baicells Technologies Co., Ltd.

Nova-436Q Outdoor LTE TDD Base Station Installation Guide About This Document This document is a guidance of Nova-436Q hardware installation for installation personnels, including the preparation of installation tools and supporting materials, the demands for installation environment, installation procedure, cable connection and power on. Accomplish the installation of the device according to this guide, the installation personnel can avoid potential damage to the device during the installation procedure, which makes sure the subsequent good running of the device. This document is suitable for model mBS31001, mBS31004 and mBS31005. Copyright Notice Baicells copyrights this specification. No part of this specification may be reproduced in any form or means, without the prior written consent of Baicells. Disclaimer This specification is preliminary and is subject to change at any time without notice. Baicells assumes no responsibility for any errors contained herein. For more information, please consult our technical engineers. Disposal of Electronic and Electrical Waste Pursuant to the WEEE EU Directive, electronic and electrical waste must not be disposed of with unsorted waste. Please contact your local recycling authority for disposal of this product. Revision Record Date Version Description 22 June, 2018 01 Initial Released. Contact Us Baicells Technologies Co., Ltd. Address: 3F, Bldg A, No.1 Kai Tuo Rd., Haidian Dist., Beijing, PR China, 100085 E-mail: support_cn@baicells.com (Non-North American region) support_na@baicells.com (North American region) Website: http://www.baicells.com/

Nova-436Q Outdoor LTE TDD Base Station Installation Guide Table of Contents 1. Product Overview ......................................................................................................... 1 1.1 Introduction ........................................................................................................... 1 1.2 Features ................................................................................................................. 1 1.3 Appearance ............................................................................................................ 2 1.4 Technical Specification............................................................................................ 3 1.4.1 Hardware Specification ................................................................................... 3 1.4.2 Software Specification ..................................................................................... 4 1.4.3 Environment Specification ............................................................................... 5 1.4.4 FCC Compliance............................................................................................... 5 2. Installation Preparation .............................................................................................. 7 2.1 Support Materials ................................................................................................. 7 2.2 Installation Tools .................................................................................................. 7 2.3 Installation Environment......................................................................................... 8 2.3.1 Locational Requirements ................................................................................. 8 2.3.2 Environmental Requirements .......................................................................... 8 2.4 Personnel Requirements......................................................................................... 8 2.5 Against Lightening and Grounding Protection ......................................................... 8 2.6 Weatherproof Protection ....................................................................................... 9 3. Base Station Installation .............................................................................................10 3.1 Unpacking............................................................................................................ 10 3.2 Installation Procedure ........................................................................................ 10 3.3 Install GPS Antenna .............................................................................................. 10 3.4 Install on Pole ....................................................................................................... 11 3.5 Install on Wall ....................................................................................................... 13 3.6 Connect Cable ...................................................................................................... 13 3.6.1 Requirement for Cable Laying........................................................................ 13 3.6.2 Connect GPS Antenna.................................................................................... 14

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 3.6.3 Connect RF Cable .......................................................................................... 14 3.6.4 Connect Optical Fiber .................................................................................... 14 3.6.5 Connect Ethernet Cable ................................................................................. 15 3.6.6 Connect Power Connector ............................................................................. 15 3.6.7 Connect Ground Cable .................................................................................. 16 3.7 Install Antenna Feeder System.............................................................................. 16 3.7.1 Install Omnidirectional Antennas................................................................... 16 3.7.2 Install Directional Antennas ........................................................................... 18 4. Power On....................................................................................................................20 List of Figures Figure 1-1 Nova-436Q Appearance ............................................................................. 2 Figure 1-2 Nova-436Q Interfaces and Indicators ......................................................... 2 Figure 3-1 Installation Procedure of Nova-436Q ....................................................... 10 Figure 3-2 Install GPS Antenna .................................................................................. 11 Figure 3-3 Location of Grounding Screws.................................................................. 16 Figure 3-4 Omnidirectional Antenna Installation (1) ................................................... 17 Figure 3-5 Omnidirectional Antenna Installation (2) ................................................... 18 Figure 3-6 Assembling Procedure of Directional Antennas ....................................... 18 Figure 3-7 Transportation the Antennas in the Height ............................................... 19 Figure 3-8 Directional Antenna Installation ................................................................ 19 Figure 4-1 LED Indicators........................................................................................... 20 List of Tables Table 1-1 Nova-436Q Interface Description ................................................................. 3 Table 1-2 Nova-436Q Interface Indicators ................................................................... 3 Table 2-1 Support Materials for Installing Base Station ............................................... 7 Table 2-2 Environmental Requirements of the Base Station ....................................... 8


Nova-436Q Outdoor LTE TDD Base Station Installation Guide 1. Product Overview 1.1 Introduction Baicells Nova-436Q is a high performance outdoor micro base station based on LTE TDD technology, which is developed by Baicells. The Nova-436Q supports wired backhaul connections to backbone networks, and provides LTE access to user terminals, implemented voice and data service transmissions. The Nova-436Q makes use of the current transmission resources to reduce the operator’s investment, implement the low-cost construction of LTE networks and enhance indoor coverage, thereby providing high-speed broadband access for users in assembly occupations. The Nova-436Q can be widely used by telecom operators, broadband operators, enterprises, and so on. 1.2 Features  Adopt the integration design of baseband and RF.  Citizens Broadband Radio Service (CBRS) band covers with dual carrier.  Based on 3GPP international standard TDD LTE technology; provide high speed data service; support a maximum transfer rate of DL: 220Mbit/s, UL: 14Mbit/s with 2x20MHz spectrum.  Support flexible uplink and downlink time slot ratio: 1(2:2), 2(1:3), and high speed data transmission.  Support 10MHz/20MHz operation bandwidth.  Support four ports antenna or two antennae with two ports.  Support copper (RJ-45) and optical port backhaul, flexible to deploy.  Security services to provide timely protection against potential security risks and illegal intrusion.  Support simple and convenient local and remote web management.  Integration as required, easy to installation and deployment, accurate coverage and improved network capacity.  Support network management functions, which includes the management, monitoring and maintenance. 1

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 1.3 Appearance The Nova-436Q base station appearance is shown in Figure 1-1. Figure 1-1 Nova-436Q Appearance The Nova-436Q interfaces and indicators are shown in Figure 1-2. Figure 1-2 Nova-436Q Interfaces and Indicators 2

Nova-436Q Outdoor LTE TDD Base Station Installation Guide The Nova-436Q interfaces are described in Table 1-1. Table 1-1 Nova-436Q Interface Description Interface Name Description PWR Power interface: +48V (+42V to +60V) DC GPS External GPS antenna, N-female connector. ANT0 External antenna 0, N-female connector. ANT1 External antenna 1, N-female connector. ANT2 External antenna 2, N-female connector. ANT3 External antenna 3, N-female connector. OPT Optical interface, connect to external transmission network, used for data backhaul. ETH RJ-45 interface, used for debug or data backhaul. The Nova-436Q interface indicators are described in Table 1-2. Table 1-2 Nova-436Q Interface Indicators Identity Color Status Description Steady On Power On PWR Green OFF No Power Supply Fast flash: 0.125s CELL 2 inactivated CELL2 Green on,0.125s off Slow flash: 1s on,1s off CELL 2 activated Fast flash: 0.125s CELL 1 inactivated CELL1 Green on,0.125s off Slow flash: 1s on,1s off CELL 1 activated Steady On Hardware alarm, e.g. VSWR alarm ALM Red OFF No alarm 1.4 Technical Specification 1.4.1 Hardware Specification Item Description LTE Mode LTE TDD LTE Frequency Band48 Model mBS31001 Channel Bandwidth 10MHz, 20MHz on each carrier Output Power 30 dBm/Ant 3

a Nova—436Q Outdoor LTE TDD Base Station Installation Guide BaiCells Item Description Receive Sensitivity —100 dBm Synchronization GPS Backhaul 1 Optical (SFP) and 1 RJ—45 Ethernet interface (1 GE) MIMO DL 2 x 2 on each carrier Dimension 310mm(H) x 239 mm(W) x 105 mm(D) Installation Type Pole, wall External 9dBi directional antenna Vertical beamwidth: 35° Antenna Horizontal beamwidth:65° Downtilt angle: 8.5° Height: 30m Overall Power <60 W Power supply adaptor, converting 110V AC to 48V DC Power (multi—national standards}) Weight About 5.5kg Note: The test method of receiving sensitivity is proposed by the 3GPP TS 36.104, which is based on SMHz bandwidth, FRC A1—3 in Annex A.1 (QPSK, R=1/3, 25RB) standard. 1.4.2 Software Specification Item Description LTE Standard 3GPP Release 12 * 2x20 MHz: SA1: DL 80 Mbps, UL 28 Mbps (per cell) SA2: DL 110 Mbps, UL 14 Mbps (per cell) Peak Rate +0 2x10MHz: SA1: DL 40 Mbps, UL 14 Mbps (per cell) SA2: DL 55 Mbps, UL 7 Mbps (per cell) User Capacity 96 concurrent users per cell/carrier 192 concurrent users per eNodeB . UL: QPSK, 16QAM Modulation DL: QPSK, 16QAM, 64QAM Voice Solution CSFB, VoLTE, eSRVCC LIPA (Local IP Access) Traffic Offload SIPTO (Selected IP Traffic Offload) Automatic setup SsON ANR (Automatic Neighbor—cell Recognition) PCI confliction detection Spectrum Scanning Supported UL Interference Supported

Nova-436Q Outdoor LTE TDD Base Station Installation Guide Item Description Detection RAN Sharing Supported Network Management TR069 interface protocol Interface MTBF ≥ 150000 hours MTTR ≤ 1 hour Support remote/local maintenance, based on SSH protocol Support remote maintenance Support online status management Support performance statistics Support failure management Support configuration management Maintenance Support local or remote software upgrading and loading Support log Support connectivity diagnosis Support automatic start and configuration Support alarm reporting Support KPI Recording Support user information tracing Support signaling trace 1.4.3 Environment Specification Item Description Operating Temperature -40°C to 55°C Storage Temperature -45°C to 70°C Humidity 5% to 95% Atmospheric Pressure 70 kPa to 106 kPa Ingress Protection Rating IP66 Differential mode: ±10KA Power Interface Lightning Protection Common mode: ±20KA 1.4.4 FCC Compliance 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 5

Nova-436Q Outdoor LTE TDD Base Station Installation Guide operation. Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:  Reorient or relocate the receiving antenna.  Increase the separation between the equipment and receiver.  Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  Consult the dealer or an experienced radio/TV technician for help. Warning: This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 50cm between the radiator & your body. 6

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 2. Installation Preparation 2.1 Support Materials Prepare the following support materials accordingly, as given in Table 2-1. Table 2-1 Support Materials for Installing Base Station Item Description Power cable < AWG16 e.g. AWG14 Shorter than 100m (330 feet) Antenna RF cable 50 ohm feeder Optical fiber Single mode optical fiber Ethernet cable Outdoor CAT6 Shorter than 100m (330 feet) Antenna Omnidirectional, or directional antenna Ground cable 16mm²yellow-green wire 2.2 Installation Tools The following tools are needed during the installation. Level bar Marking pen Knife Vise Wrench Percussion drill and hammer Cross screw Cable vice Tape measure some drill heads driver 5mm L-shape Allen T7 screwdriver Ladder wrench head 7

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 2.3 Installation Environment 2.3.1 Locational Requirements Environments with high-temperatures, harmful gases, unstable voltages, volatile vibrations, loud noises, flames, explosives, and electromagnetic interference (large radar stations, transmitting stations, transformer substations) are not suitable for the operation of Nova-436Q, and thus should be avoided. Places prone to have impounded water, soaking, leakage, or condensation, should also be avoided. Factors like climate, hydrology, geology, earthquake, electric power, and transportation should be taken into consideration in the construction process so that a proper location can be chosen to meet the communication engineering environmental requirements, as well as the technical requirements of network planning and communication equipment. 2.3.2 Environmental Requirements Table 2-2 gives the base station’s environmental requirements with regards to temperature, humidity, and voltage. Table 2-2 Environmental Requirements of the Base Station Item Range Typical value Temperature -40°C to 55°C 25°C Relative humidity (no condensation) 0% to 100% 5% to 95% Safety voltage 42V to 60V 48V 2.4 Personnel Requirements The installation personnel must master the basic safe operation knowledge, through the training, and having the corresponding qualifications. 2.5 Against Lightening and Grounding Protection CAUTION: It is unlikely to happen but since the LTE base station is very sophisticated equipment so we would recommend you to test it on the ground to make sure everything is functioning before install on the tower. 8

Nova-436Q Outdoor LTE TDD Base Station Installation Guide The operator must prepare external against lightning protector to protect the GPS, external antenna and RJ-45 port. Grounding Notes:  The ground wire adopts yellow-green wire that is no smaller than 16 mm².  Grounding principle: as near as possible.  The base station connects to the reliable outdoor grounding point (earth) through one ground screw.  The connection of the grounding points and the ground bar need to be tight and reliable. Rustproofing the terminals is required. This can be done with rust preventing paint, anti-oxidation coatings, grease, and so on. 2.6 Weatherproof Protection The Nova-436Q adopts cold shrink tube for weatherproof protection. Before installing the cold shrink tube, clean up the interface first. The weatherproof protection steps are as follows: 1. Insert cable into cold shrink tube. 2. Tighten the connector. 3. Push the cold shrink tube to the top joint and pull out the strip. 4. Check whether the cold shrink tube tight connect with the connection. 9

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 3. Base Station Installation 3.1 Unpacking Before opening the box, make sure the package is in good condition, undamaged and not wet. During the unpacking, avoid potential damaging impacts from hits or excessive force. Once unpacked, check whether the quantity are consistent with the packing list. 3.2 Installation Procedure The installation procedure of Nova-436Q is given in Figure 3-1. Figure 3-1 Installation Procedure of Nova-436Q 3.3 Install GPS Antenna Installation requirements on the GPS antenna:  No major blocking from buildings in the vicinity. Keep the rooftop buildings a distance away from the GPS. Make sure the space atop within 90 degrees (at least 45 degrees) is not blocked by any buildings.  Avoid installing the GPS in the vicinity of any other transmitting and receiving 10

Nova-436Q Outdoor LTE TDD Base Station Installation Guide devices. Avoid interference from other transmitting antennas to the GPS antennas.  Should be installed within 45 degrees to the lightning rod. The GPS has been assembled before packing, the only installation step is to fix the GPS mounting bracket on the base station with the M4*14 screws, as shown in Figure 3-2. Figure 3-2 Install GPS Antenna 3.4 Install on Pole Required diameter of the pole: 40mm ~ 100mm. Suggest the installation height higher than 120cm. The base station bracket has been assembled before packing. In the installation site, the installation persons only need to fix the assembled base station on pole. 1. Unscrew the four screws of the assembled bracket and slide the two omegas to the left as the following figure, and then turn the two omegas up or down. 2. Make sure the base station’s installation height, fit the thread rod of the assembled bracket to the pole, and then turn the two omegas to proper position as the following figure, and slide the two omegas to the right, and then fasten the four screws. 11

2 Nova—436Q Outdoor LTE TDD Base Station Installation Guide Ba 3. As the following figure, hung the two pins on the base station bracket to the installation bracket, push the base station until the hook block to the base station bracket. Tighten two screws on the top of the bracket using cross screwdriver to complete the installation. 12

Nova—436Q Outdoor LTE TDD Base Station Installation Guide BaiCells 3.5 Install on Wall The wall must bear four times of the base station weight. 1. Take apart the assembled installation bracket kit to get the installation bracket 2. Fit the installation bracket on the wall, and mark the drilling locations. Caution: The arrow of the installation bracket must be upward. 3. Drill two 10mm diameter and 70mm depth holes in the wall by following the marked locations. 4. Check the up/down direction of the installation rack, and then fix base station to the wall using M8*80 expansion screws. 5.. Refer to the installation steps on pole, fix base station on wall. 3.6 ConnectCable 3.6.1 Requirement for Cable Laying General requirements: + Bending radius requirement of feeder cable: 7/8" > 250mm, 4/5" > 380mm + Bending radius requirement of jumper cable: 1/4" > 35mm, 1/2" (super soft) > 50mm;, 1/2" (ordinary)»127mm + Bending radius requirement of power cable and grounding cable: > tripled of the diameter of cable + The minimum bend radius of the optical fiber is the 20 times of the diameter of optical fiber. + Binding the cables according the type of the cable, the intertwining and crossing is forbidden. 13

Nova-436Q Outdoor LTE TDD Base Station Installation Guide  The label should be paste after the cable laying. Optical fiber laying requirement:  The circling and twisting is forbidden during the laying.  The binding on the turning is forbidden.  The pulling and weigh down the optical fiber is forbidden.  The redundant optical fiber must enwind the dedicated device. Grounding laying requirement:  The grounding cable must connect to the grounding point.  The grounding cable must be separate with the signal cables, remaining a certain distance to avoid the interruption of signal. 3.6.2 Connect GPS Antenna 1. Insert GPS jumper into cold shrink tube. 2. Connect one end of the GPS jumper to the GPS antenna. 3. Push the cold shrink tube to the top joint and pull out the strip. 4. Connect the other end of the GPS jumper to GPS interface of the base station, which also need weatherproof protection. 3.6.3 Connect RF Cable 1. Open the dust cap of ANT0, ANT1, ANT2, and ANT3 interface. 2. Insert RF cables into cold shrink tube. 3. Connect one end of the two RF cables to ANT0, ANT1, ANT2, and ANT3 interface of the base station and tighten them with wrench. 4. Push the cold shrink tube to the top joint and pull out the strip. 5. Connect the other end of the RF cables to the external antennas, which also need weatherproof protection. 3.6.4 Connect Optical Fiber 1. Unscrew three screws on the cover of wiring cavity using M4 cross screwdriver and open the wiring cavity. 2. Connect the optical fiber to OPT interface in the wiring cavity. 14

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 3. Lay optical fibers along the wire groove, and stretch out the wiring cavity from OPT hole. The redundant fiber should wind neatly. 3.6.5 Connect Ethernet Cable 1. Connect the Ethernet cable to ETH interface in the wiring cavity. 2. Lay Ethernet cable along the wire groove, and stretch out the wiring cavity from ETH hole. 3.6.6 Connect Power Connector Because it is not sure that the distance between the installation site and the power supply device, the two ends of power adapter are bare terminal end. The operators need to make power cable according to the actual conditions on installation site, and assemble power plug and power terminal on two ends of power adapter. Strip 12mm insulating layer with wire stripper, which is used for connection to connector. It is recommended that the power cord length is kept below 100m (330 feet). The connection steps of power cable is as follows. 1. Assemble power plug. The power plug will be installed on the end of input direction. Refer to the identification on power plug, connect live wire, neutral wire, and ground wire to corresponding terminals separately, and tighten screws. 2. Assemble power terminal. The power terminal will be installed on the end of output direction. Refer to the following figure to connect live wire and neutral wire. 3. Connect the power cable to PWR interface in the wiring cavity. 4. The power cable lays along the lint slot, and stretch out the wiring cavity from PWR hole. 5. The input of the power adaptor connects to the outlet.  If the outlet is indoors, place the power adaptor indoors. 15

Nova-436Q Outdoor LTE TDD Base Station Installation Guide  If the outlet is outdoors, place the power adaptor in a water proof box. 6. After the cable connection is complete in the wiring cavity, tighten the screws on the cover to close the wiring cavity using M4 cross screwdriver. 3.6.7 Connect Ground Cable Make the grounding cable according the actual situation of the installation site. The Nova-436Q provides two grounding screws, which is located on the bottom of the base station, as shown in Figure 3-3. Figure 3-3 Location of Grounding Screws 1. Unscrew one grounding screw, connect one end of the grounding cable to the grounding screw, and fasten it again. 2. The other end of the ground cable needs to connect to a good grounding point. 3.7 Install Antenna Feeder System There are two kinds of outdoor antennas, omnidirectional outdoor antennas and directional outdoor antennas, whose installation will be introduced in the following, respectively. 3.7.1 Install Omnidirectional Antennas One should pay attention to the followings while installing the omnidirectional outdoor antenna:  The diameter of the pole for omnidirectional outdoor antennas is required to be 35mm ~ 50mm. A typical case is to use the 50mm-diameter round-steel-made pole (with details depending on the specific antenna type). 16

Nova-436Q Outdoor LTE TDD Base Station Installation Guide  Make sure that the top of pole and the clamp beneath the antenna are at the same level, after installing the omnidirectional outdoor antenna on the pole.  Make sure that the antenna is high enough to meet the coverage requirement, and that the antenna top falls within the 45 degrees safety angle towards the lightening rod, as shown in Figure 3-4. In principle, no lightening rod can be welded to pole (no metal object is allowed within 1m of the horizontal direction of the omnidirectional antennas), when installing the omnidirectional antennas. Instead, an independent lightening rod should be settled between the two poles, where the lightening rod must be high enough to keep all antennas under its protection cover. Figure 3-4 Omnidirectional Antenna Installation (1) In case is impossible to install an independent lightning rod due to environmental limitations, the installation method shown in Figure 3-5 can be used. Be aware that the pole supporting the lightening rod should be kept at least 1m away from the omnidirectional outdoor antennas. 17

2 Nova—436Q Outdoor LTE TDD Base Station Installation Guide Ba Figure 3—5 Omnidirectional Antenna Installation (2} Lightening rod _4 °> Omnidirectional outdoor antenna Loop ring Angle fron Antenna pole 3.7.2 Install Directional Antennas 1. First, assemble the antennas, as shown in Figure 3—6. Figure 3—6 Assembling Procedure of Directional Antennas * Clane Upper rack NS Lower rack ("Cchan Done 2. To install it on the iron tower, use a pulley to transport the antenna assembled to the platform on the iron tower, as shown in Figure 3—7. Following the safety rules when working at these heights. 18

2 Nova—436Q Outdoor LTE TDD Base Station Installation Guide Ba Figure 3—7 Transportation the Antennas in the Height RA! &. Fixed pulley \ Lifting rope 3. Fix the pole vertically to the ground or concrete pillars on the rooftop using expansion screws, and fasten it with steel wires. Then, mount the directional outdoor antenna onto the pole using the installation rack, as shown in Figure 3—8. Figure 3—8 Directional Antenna Installation Lightening rod fl Installation a bracket on pole Directional @7 5mm outdoor antenna Antenna pole A 50Gmm Steel wire Concrete pillar Flat steel Connected to the lightening—proof ground network 4. When the base station has been installed in a proper position, connect all the cables and wires. 5. Run tests, then seal and weatherproof all the connections after the testing has successfully completed. Refer to 2.6 Weatherproof Protection. 19

Nova-436Q Outdoor LTE TDD Base Station Installation Guide 4. Power On Power on the Nova-436Q, and the indicators will light up, as shown in Figure 4-1. Figure 4-1 LED Indicators The explanation of the indicator signal is given in Table 4-1. Table 4-1 Nova-436Q Indicator Description Identity Color Status Description Steady On Power On PWR Green OFF No Power Supply Fast flash: 0.125s CELL 2 inactivated CELL2 Green on,0.125s off Slow flash: 1s on,1s off CELL 2 activated Fast flash: 0.125s CELL 1 inactivated CELL1 Green on,0.125s off Slow flash: 1s on,1s off CELL 1 activated Steady On Hardware alarm, e.g. VSWR alarm ALM Red OFF No alarm 20


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Document Modified: 2019-08-20 19:06:55
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