UPCOM BUC Manual 125W Redundant M Version 12222
Contents
1. 17 Master BUC S1 C 1 Transfer Switch S1 WG 2 Transfer Switch Y Cable IF In 10 MHz Ref In RF Out gt lt R1 Termination R2 Termination u2 IF In _ _ _ _ _ ACI gt M amp C 1 17 Slave BUC RF Out AC In Slave 1 3 J2 Red 1 10 S1 Port 3 Transfer Switch Circ 1 19 COMPANY CONFIDENTIAL This document is the property of UPCOM TECHNOLOGIES and may be neither used copied nor reproduced outside of the company Nor may its contents be communicated outside of the company except with the written permission of UPCOM TECHNOLOGIES2. Control Program Review Appendix A for additional information on setting up a Redundant System General Maintenance With proper care and maintenance your Block Up Converters BUC will provide many years of reliable service Please follow these maintenance guidelines so that your equipment will provide you with the maximum amount of trouble free service Basic Cleanliness The exterior chassis of the Block Up Converters BUC acts as a large heatsink that must dissipate at least a few hundred Watts Excessive dirt dust debris and sand accumulated on the chassis surface will impede its ability to dissipate heat and will result in higher internal temperatures potentially shortening the Block Up Converters BUC s lifespan Periodically inspect the chassis for excessive dirt and remove as necessary A brush combined with compressed air is the safest way to clean the unit Also inspect the fan assembly for any dirt or debris that also might impede airflow Internal Fuse The internal power supply is protected by a fuse to prevent excessive input current consumption Contact the factory if you suspect the internal fuse has tripped and instructions will be sent on how it can be replaced Fan Inspection and Replacement Normally the fan on the unit operates continuously when input power is connected to the unit If the fan stops turning and the Block Up Converters BUC still provides an output signal when it is cool it is time to re
3. Display This indicator shows the general status of the Block Up Converters BUC if everything is good or if an error condition has occurred or if the unit has been manually disabled by mute control Also the operating status of a Master Slave redundant pair is reflected Booster Temperature Display Using the UPCOM TECHNOLOGIES Monitor and Control Software a thermometer display with a numeric readout of the base plate temperature of the unit in degrees Celsius is shown The base plate temperature typically experiences a 20 to 30 degree rise above ambient on the highest power Outdoor Block Up Converters BUC s and 15 to 20 degree rise on lower power units This display corresponds with the Temperature Monitor outlined in the analog M amp C section above Output Power Display A numeric readout of the output power level is displayed in units of dBm The indicator is calibrated at the factory using the middle frequency of the Block Up Converters BUC and has approximately a 20 dB dynamic range When this range is exceeded the readout shows Low or High depending on which particular limit has been reached This display is derived from the RF Output Power Monitor signal outlined above Overheated Alarm This alarm indicates when the units baseplate rises above about 85 C which is an overheated condition The unit will automatically enter into a muted state This function has approximately a 20 C hysteresis window which will all
4. ets easeu nabs cadens uty due mein tenes cane 14 Microcontroller ee es 14 A aan 15 Dual Transter Wicca are 15 PADD NIG Aiello 16 Installation Notes for Redundant SysteM ooocccnococccccccoconocnnnncccnnnanncnnnnnonns 16 Outdoor Solid State Block Up Converters BUC System User Guide This section provides the general information for the UPCOM TECHNOLOGIES line of Outdoor Solid State Block Up Converters BUC s The Outdoor Solid State Block Up Converters BUC has been designed and manufactured to be extremely robust and reliable lt is well suited for harsh outdoor environments Description Please refer to Appendix A for the appropriate product data sheet and specifications The Outdoor Block Up Converters BUC is a one piece integrated amplifier system It includes the AC DC Power Supply microwave Booster Amplifier Module Block Up converter BUC microcontroller based monitoring and control circuitry and an efficient thermal management system The reduced size and weight of this system allow it to be used in a wide variety of installations many of which historically precluded the use of solid state units This system is ideal for mounting on the boom of small antennas or anywhere that size and weight are a major concern Features include e Compact size Light weight Auto Sensing Power Supply Output Power Detection Optional Internal 1 1 Redundant Capability Optional Serial RS 232 RS 485 or Parallel Monitor 8 Control Circui
5. operate over a wide variety of input power conditions encountered around the world DC DC Converter The DC DC converter module is a switched mode power supply that converts the 300 VDC to 12 VDC This 12 VDC is the primary high current DC voltage source that operates the booster amplifier module A secondary module converts the 300 VDC to 24 VDC This source powers the Block Upconverter and the Cooling System Units with input AC power use the above AC DC and DC DC topology Units with DC input use a single DC DC converter stage to convert from the input supply voltage to the system s required 12 VDC and 24 VDC Cooling System The Outdoor Block Up Converters BUC s cooling system represents a landmark in microwave telecommunication amplifiers It is a unique system of heat sinks that have been computer optimized to provide extremely efficient cooling of all of the system s functional blocks This high efficiency cooling system is primarily responsible for the small overall package size and reduced weight of the unit The Cooling System is based on a forced convection technique in which both system fans provide the air intake while the exhaust is brought out around the outer perimeter of the fans The fan is up to 300 CFM rated and operate into approximately 0 3 in H20 back pressure It is also weather protected for reliability under a variety of conditions Block Upconverter The Block Upconverter BUC takes an L Band input and
6. this length should use the RS 485 which will allow serial control up to 4000 ft 1200 m Monitor and Control Software UPCOM TECHNOLOGIES Monitor and Control Software is provided on CD for units equipped with an onboard Microcontroller system A Windows based PC uses this software to remotely monitor and control the Block Up Converters BUC through its serial port The software interface is split in two indicating Master Unit and Slave Unit Both sections are active for redundant configurations while only one of the sections is used for stand alone operation Various Monitors and Alarms are displayed along the left hand side of the interface Ifa problem has been detected it will be displayed in red and the Block Up Converters BUC will be placed into a muted state Installation Instructions System Requirements e PC running Windows 98 Me 2000 or XP NT 4 0 with Service Pack 6a e Display resolution of 800 x 600 or greater e Free serial port RS 232 or RS 485 e Microsoft NET Framework Compatibility under Windows Vista has not been tested The Monitor and Control Software is located inside the Monitor854 folder on the CD Copy this folder to your preferred location on your PC The Monitor854 program requires Microsoft NET framework included If this is not installed please run dotnetfx exe under the Microsoft NET Redistributable folder on the CD Start the software by running monitor854 exe Status
7. through a single frequency translation converts the signal to the final output frequency C or Ku Band The BUC locks onto an input 10 MHz reference signal to provide the final output frequency The conversion gain for this sub section is in the neighborhood of 55 dB Booster Amplifier This module uses GaAs MESFET technology to boost the signal level to its final output power level A bias assembly connects the 12 V power supply with the FETs and provides proper bias voltages including the negative voltage for the FET gates and voltage sequencing at turn on and turn off The gain for this section is in the neighborhood of 20 dB Microcontroller This section is responsible for serial communications and for processing of the Monitors and Controls Various alarms are monitored such as overheating and PLL lock alarms along with select DC voltages The microcontroller disables the Block Up Converters BUC when any of these status indicators show a problem In addition it is possible for the microcontroller to report output power levels in dBm and control system conversion gain when appropriate hardware is installed In Redundant configured units the Microcontroller is also responsible for system switching behavior Attenuator Module This is an electrically controlled variable attenuator an optional component that generally receives control signals from the Microcontroller It is responsible for both gain control functions and supp
8. User Guide C Band Solid State Block Up Converters BUC Model M Table of Contents TableE 01 G nlenB u eu n Outdoor Solid State Block Up Converters BUC System User Manual BE a ee a A et weenie aT Equipment Supplied a ota eek generalinformalon ars Safety C nsideralions anne alien High Voltage Hazards a u RE Transmission HaZzatOS 2 222 028 ais IMSPSCHON een Return of Equipment Au ee Eee PONS ANG Interfaces san Prime Power COMEN ers A A PUP OUND A a a a T M amp O CONMC COR eane chp heen aaae eae aide ia a Redundancy Pollen a roda Master Slave Selector SWitCh oooooncoocccococccocccccccccccconononnnnnnonnonnnnnnnconnnnnnnnos Temperature Mon tte acs pect eaete odds eae neusseeamenteey RF Output Power Moni u ea ee S mmay A O HPA Mute CORTO uc a a een Ground GIN DY coe lech A a iio LO Locked Unlocked Monitor cccccccceceeeeeeeeeeeeeeeeeeesensnaneeeeeeeeeeeees RS 232 RSB 5h ida Monitor and Control Software uuuseeensenssssseennennnennennnnnnnnnnnnnennnnnnnnnnnn Outdoor Block Up Converters BUC Quick Start Guide oo 12 General Maintenance ccconccnnnnnnoninonononnnnconccnnencnnncnnnnnnnnnnnn nono nnncnnennnennnnnncnnes 13 Basic ISI nai 13 O 13 Fan Replacement aenar dass penn ea ah raaa ea eea D E a a 13 PHGORY ot OpPETallon ae sen 14 AMD CONVE MEL rra 14 DCT DC CONVE ratita 14 COOLING INSI Teresa ee ln asada 14 Block UPcON Vesta fria 14 A
9. amp C Connector Pin Description A Signal GND B Temperature Monitor C RF Output Power Monitor D Summary Alarm E HPA Mute Control F RS 485 G RS 485 H RS 232 Rx J RS 232 Tx K RS 232 GND L LO Monitor M GND To connect the RS 232 interface to a standard PC 9 pin D sub serial port make the following connections M amp C Connector Pin DB 9 Pin H 3 J 2 K 5 Temperature Monitor The temperature of the unit baseplate is monitored by a voltage analogous to temperature The output is 3 0 V at 27 C with a slope of 10 mV C RF Output Power Monitor The output power of the unit is monitored by a voltage analogous to the output power level The voltage is restricted to in between 0 V to 5 V This detected voltage is useful over a 20 dB range of output power Summary Alarm The Summary Alarm ORs together four different conditions an over temperature alarm a user mute enable an internal power supply fault and a LO lock monitor alarm If an over temperature condition occurs the unit will be placed into a muted state and the Summary Alarm will go low 0 V Also if the unit is muted through the Mute Input the Summary Alarm will also show an alarm condition low HPA Mute Control Shorting this line to Ground or applying O V to this line will disable the Booster Amplifier module Leaving it open or applying 5 V will keep the unit enabled Ground GND This pin is connected to t
10. ct Com port is selected the software uses the Select Port menu item Menu Items Under the File menu item there is a set of calibration routines exposed to the user These are intended for factory use only No support will be provided if any of these settings are adjusted Under the Select Port menu item your appropriate Com port is selected for serial communication to the Block Up Converters BUC Quick Start Guide e Connect the L Band 10 MHz Reference to the labeled port Nominal IF input levels are approximately 28 dBm depending on the output power level of the unit The 10 MHz Reference must be in the range of 5 dBm to 5 dBm Note that the Block Up Converters BUC will be in a mute state with the Reference signal absent e The Block Up Converters BUC s output is taken from the waveguide port RF Out Caution should be observed here to make sure that the antenna or a suitable termination is connected to this port before operating the Block Up Converters BUC e Ensure there is proper clearance around the unit e Connect AC Input power to the connector The unit will be enabled almost immediately provided it is not forced into a mute state e Optional Connect the M amp C interface to an available COM port on your computer and or to your analog based monitoring and control equipment e Optional Install the Windows based Monitor and Control Program from the supplied GD e Optional Run the UPCOM TECHNOLOGIES Monitor and
11. ctions ensure that all ports and interfaces have all plastic covers or protective films tape removed Using the waveguide dual switch assembly check the alignment of the RF Out ports on the Block Up Converters BUC s and adjust as necessary e Waveguide Port 4 of the switch attaches to the RF Out port of the Master e Waveguide Port 2 of the switch attaches to the RF Out port of the Slave e Waveguide Port 3 is terminated e Waveguide Port 1 acts as the redundant system output Connect the 2 IF input cable assemblies and other coaxial connections e Coaxial Port 4 of the switch connects to the IF Input port of the Master e Coaxial Port 2 of the switch connects to the IF Input port of the Slave e Coaxial Port 3 is terminated e Coaxial Port 1 acts as the redundant system input Connect the redundant port cable assembly e Attach J1 to the Master Redundancy RF Switch Port e Attach J2 to the Slave Redundancy RF Switch Port e Attach J3 to the waveguide switch circular connector When using the serial port interface it is recommended to only connect to the Master Unit M amp C Port Both Master and Slave unit can be accessed through the software GUI in this way using a single connection The input to the redundant system is Coaxial Port 1 of the switch and the output is Waveguide Port 1 of the switch ul IF In RF Out AC In Master 1 3 Ji AC 1 3 Red 1 10 Serial M amp C 1 17 M amp C 1
12. ed and an alarm is indicated For redundant configurations make note of the Reset PLL Status Button listed below Mate Status In redundant configurations the Mate Status indicates the mute condition of its mate That is the Master display shows the Slave condition and the Slave display shows the Master condition Reset PLL Status Button Used only in redundant configurations If a LO Monitor alarm occurs PLL Status will store the alarm until Reset PLL Status is pushed or power is cycled to the unit Attenuator Control System conversion gain can be changed here provided an attenuator module has been installed The range of control is from O dB no attenuation applied to 20 dB 20 dB of gain reduction in 0 5 dB steps The value may be stepped up or down or entered directly with the keyboard by highlighting the entry field Note that this control is dependent on an installed hardware option If it is not installed this control will not have any effect Temperature Compensation Tighter temperature compensation response is also possible with the attenuator module installed There is no user control here and the unit must have the requisite hardware option installed and be calibrated at the factory for this function to be active Communication Status The communication status between the software and the Block Up Converters BUC is reflected here If there is a problem here double check all serial port connections and ensure the corre
13. he chassis which also represents the main Ground of the unit All the transmission equipment should be grounded at the antenna location All cables interconnection outdoor equipment to indoor equipment should be grounded at the entry point The antenna and outdoor grounding rods should be connected to the building entry grounding rod by means of a separated grounding cable AWG 4 or thicker to avoid current loops travelling through cables Equipment returned to factory with power supplies damaged due to power surges or lightening strikes will not be covered by warranty PLEASE MAKE SURE THAT THE UNIT AND CABLES ARE PROPERLY GROUNDED TO AVOID DAMAGES TO THE EQUIPMENT AND RISK TO PERSONEL LO Locked Unlocked Monitor This alarm indicates the PLL lock status of the internal BUC module A logic low 0 V indicates no alarm Local Oscillator locked while a high 5 V indicates a problem Local Oscillator unlocked RS 232 RS 485 Available with Microcontroller equipped systems This serial link is normally used to communicate with a remote PC running UPCOM TECHNOLOGIES Monitor and Control Software This enables a simple way to view control the Monitors and Controls listed above and also enables the functions listed below Normally either RS 232 or RS 485 is available at any one time both interfaces cannot be used simultaneously Communication links using RS 232 are typically good up to 30 ft 9 m in length Installations exceeding
14. lemental gain versus temperature compensation Dual Transfer Switch Supplied only with Redundant Systems It is a dual switch with a coaxial section and a waveguide section The coaxial section is used to transfer the input signal to either Master or Slave and the waveguide section is used to transfer the output signal from either Master or Slave Port 3 is terminated on both coaxial and waveguide sections Port 4 connects to the Master and Port 2 connects to the Slave Coaxial Port 1 acts as the system input and Waveguide Port 1 acts as the system output A manual switch position knob is present but this should normally never be used when the system is connected and powered up Appendix A Installation Notes for Redundant System The redundant system is composed of the following items 1 2 outdoor Block Up Converters BUC units each configurable between Master or Slave or M S Note that older units may be internally hardwired for Master Slave operation and cannot be changed 2 1 waveguide dual switch assembly 3 1 redundant port cable assembly 3 connector Y assembly 4 2 input cable assemblies Assemble the Block Up Converters BUC units onto your support bracketing may not be supplied Use the toggle switch on the unit to select either Master or Slave operation mode M or S The Redundant System must have precisely 1 Master and 1 Slave Make note of which unit is the Master and which is the Slave Before making any conne
15. nt configured units only The interface connector is used to connect between two Block Up Converters BUC s and a waveguide coaxial dual switch when used in a 1 1 redundant system It is a 10 pin circular connector MS3102R18 1S It requires a mating connector MS3106F18 1P A Y link cable with the required mating connector is provided with a Redundant System A Redundant configured unit may be operated in stand alone mode and behaves in a similar way to a normal Microcontroller equipped unit If this is done it is important to cover the Redundancy Port to protect it from the external environment since there are live voltages present on this interface Never connect anything accept for the supplied Y link cable to this interface port Master Slave Selector Switch Present on Redundant configured units only This selector switch is used to configure the unit as Master or Slave A Redundant System is composed of precisely one Master and one Slave There may be a protective bracket around the switch that prevents accidental toggling of the switch On some units the Master Slave assignment is hardwired inside the unit The Master Slave assignment is detected when powering up the Redundant System Note Always ensure that when operating the Redundant System that one unit is set as Master and the other is set as Slave If they are set as Master Master or Slave Slave the Redundant System will not switch properly Power down the unit to correct the se
16. ow the Block Up Converters BUC to re enable itself when the temperature is reduced by 20 C at the baseplate PS Voltages Monitor The output voltage levels of the Power Supply are monitored and this alarm indicates when any of them fall below a preset level Three voltages are monitored 12 V feeding the Booster Amplifier 24 V going to the BUC and 5 V from the bias assemblies attached to the Booster Amplifier The unit will enter a muted state when this alarm is active Manual Control Enable Disable and Mute Input A manual mute control can be accessed from the Enable Disable button of the software Note that this control is independent of the HPA Mute Control labeled as Mute Input in the GUI outlined above and is accessed from the hardware M 8 C port Also note that the hardware HPA Mute Control has priority over the mute status a Block Up Converters BUC placed into a muted status by the hardware HPA Mute Control line cannot be brought out of muted status by the software Enable Disable button The status of the Mute Input line is monitored and displayed by the software For systems set up for 1 1 Redundant operation this control is also used for manually selecting the Active unit in a redundant pair PLL Status Display The PLL Status reports the lock condition of the BUC module and corresponds with the LO Locked Unlocked Monitor described above If the Block Up Converters BUC loses lock the Block Up Converters BUC is disabl
17. place the fan Immediately remove power to the unit the prevent damage by overheating Periodical inspection of the status of the fan is a major priority in the preventive maintenance of the unit If the fan is dirty it should be cleaned Special care should be taken in environments with high level of fine sand such as deserts If possible assemble the unit with the fans looking down to avoid debris dust and sand deposits The user should inspect the fans on a monthly basis and determine when it s recommendable to replace the fan Periodical cleaning or replacement of the fans is a small cost compared to the repair of an amplifier inside the unit Contact the factory to order the correct replacement fan for your particular model The fan is encased in a shroud to direct airflow to the chassis heat sink fins First remove the shroud from the main chassis using the screws at each side of the chassis The fan and shroud assembly will be connected by wires to the main chassis Disconnect the wire connection by pulling apart the inline wire to wire connector Next remove the screws holding the fan to the shroud and fan grille Remove the fan and install the replacement fan in reverse order as described above Theory of Operation AC DC Converter The prime AC input power is delivered to a converter module that produces 300 VDC This module is an auto sensing front end that has proven reliability and allows the amplifier system to
18. prior to applying prime AC input power e Never look directly into the RF output waveguide Maintain a suitable distance from the source of the transmission such that the power density is below recommended guidelines in ANSI IEEE C95 1 The power density specified in ANSI IEEE C95 1 1992 is 10 mW cm These requirements adhere to OSHA Standard 1910 97 e When a safe distance is not practical RF shielding should be used to achieve the recommended power density levels Inspection When the unit is received an initial inspection should be completed First ensure that the shipping container is not damaged If it is have a representative from the shipping company present when the container is opened Perform a visual inspection of the Outdoor Amplifier to make sure that all items on the packing list are enclosed If any damage has occurred or if items are missing contact UPCOM TECHNOLOGIES Inc Return of Equipment When returning items back to UPCOM TECHNOLOGIES for replacement or repair please prepare the following information e A written description of the problem encountered e The part number and serial number of the unit in question Once this information is ready please contact UPCOM TECHNOLOGIES to obtain a Return Material Authorization RMA number and shipping instructions Ports and Interfaces Prime Power Connection The Prime Power Connector is the point where the unit receives input power The AC input can operate over a
19. range of 90 270 VAC at 47 63 Hz This connector is a 3 pin circular connector MS3102R16 10P The mating connector MS3106E16 10S is supplied AC Input Connector Pin out PinA Line 90 265 VAC 47 63Hz PinB GND PinC Neutral Units with higher output power levels gt 50 W for Ku Band and gt 100 W for C Band should be powered only from a 180 270 VAC source This will keep AC line currents to a safe operating level In some cases the unit may only be specified to operate at higher input voltage levels please consult the accompanying Bench Test Record for this information Whether AC or DC input when wiring up the mating connector carefully follow the pin descriptions noted in the accompanying Bench Test Record Incorrect connections can seriously damage the unit Please contact the factory if there are any questions regarding these input connections RF Input The RF Input connector is a type N female connector type F female is an option The input frequency is in the L Band Nominal RF input levels are approximately 28 dBm depending on the output power level and the system gain of the unit The maximum input level should be limited to 10 dBm to avoid damaging the unit The input connector must also receive a 10 MHz reference signal which is used to frequency lock the internal Block Upconverter Absence of this signal will place the unit into a muted condition and a Lock Monitor alarm will be present The nominal input le
20. try Optional Windows Monitor amp Control Software Optional gain control on selected configurations Equipment Supplied The following equipment is supplied with each unit e The Outdoor Block Up Converters BUC Assembly e Prime Power Mating Connector MS3106E16 10S e M amp C Mating Connector MS3106E20 29P where applicable e CD with UPCOM TECHNOLOGIES Monitor amp Control Software where applicable General Information Safety Considerations Potential safety hazards exist unless proper precautions are observed when working with this unit To ensure safe operation the user must follow the information cautions and warnings provided in this manual as well as the warning labels placed on the unit itself High Voltage Hazards Only qualified service personnel should service the internal electronic circuitry of the Outdoor Block Up Converters BUC High DC voltages 400 VDC are present in the power supply section of the amplifier Care must be taken when working with devices that operate at this high voltage levels It is recommended to never work on the unit or supply prime AC power to the unit while the cover is removed RF Transmission Hazards RF transmissions at high power levels may cause eyesight damage and skin burns Prolonged exposure to high levels of RF energy has been linked to a variety of health issues Please use the following precautions with high levels of RF power e Always terminate the RF input and output connector
21. ttings and try again if this happens Also when replacing one of the units for servicing always check that the replacement unit has the same Master Slave setting as the unit being removed Airflow The air intake and exhaust are both located on the bottom side of the Block Up Converters BUC The intake is brought through a fan while the exhaust is along the rows of heat sink fins A minimum clearance of 12 inches 305 mm should be maintained between the air intake of the Outdoor Block Up Converters BUC and exhaust during operation This will ensure that there is no forced re circulation of airflow from exhaust to intake Lower output power units are not equipped with a fan but the same clearance stated above must be kept around the unit for proper operation Monitors and Controls Monitor signals and Control lines are present on the M amp C Connector when this option is installed With a Microcontroller equipped system all Monitors and Controls can also be accessed remotely by RS 232 RS 485 to a Windows based PC and other Alarms become available as well Units equipped with a Redundancy option have a Microcontroller M amp C installed by default The full M amp C Connector pinout is listed here for convenience However always check the Test Bench Record supplied with the unit to view which interfaces have been installed on your unit or to see if it has had any custom modifications M
22. vel of the 10 MHz reference signal is 0 dBm 5 dB ATTENTION THE MODEL M BUCS HAVE INTERNAL DC POWER SUPPLY DO NOT INPUT DC VOLTAGES TO THE RF L BAND INPUT CONNECTOR EXTERNAL 10MHZ REFERENCE IS STILL REQUIRED IN THIS MODEL RF Output The RF Output is brought out through coaxial or waveguide in the Outdoor Block Up Converters BUC The Ku Band Block Up Converters BUC have a WR 75 Grooved Flange while the C Band Block Up Converters BUC have CPR style grooved flange CPR 137G An isolator is provided at the output flange with a termination capable of handling full reflected output power The Block Up Converters BUC s output is taken from the coaxial or waveguide RF Out port Caution should be observed here to make sure that the antenna or a suitable termination is connected to this port before operating the Block Up Converters BUC The Block Up Converters BUC is protected against full reflection but dangerous levels of microwave energy can be present at this port Never look directly into the RF output waveguide M 8 C Connector The Monitor and Control M amp C connector is the primary input for controlling the Block Up Converters BUC and monitoring fault conditions It is a 17 pin circular connector MS3102R20 29S It requires a mating connector MS3106E20 29P which is supplied with the unit See the next section for a more detailed explanation of the M amp C functions Redundancy Port Present on Redunda
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