Fairfield BOX-BASE Geophysical Data Telemetry System User Manual BS App 5

Fairfield Industries Inc Geophysical Data Telemetry System BS App 5

Operating Manual

THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 0 of 33Appendix 5Base Station Radio System
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 1 of 33Appendix 5Contents1.0 Base Station Modules2.0 Radio Command Unit (RCU)2.1 Overall Description2.3 Baseband Module3.3.1 Overall Description2.3.2 Circuits and Function2.3.2.2 DSP and Memory2.3.2.2 Digital I/O, RCB. RS-232 and Timer2.3.2.3 Codec and Clock Generation2.3.2.4 FPGA and Seismic Data Bus2.4 Clock Generator and Splitter Module2.4.1 Overall Description2.4.2 RF Splitter Sub-Module2.4.3 Clock Reference Generator Sub-Module2.4.4 RCU and DRU Versions2.5 Power Amplifier Module2.5.1 Overall Description2.5.3 Power Amplifier Sub-Module2.5.3.1 DC Null2.5.3.2 RF Attenuation2.5.4 Linearizer Sub-Module2.5.4.1 Linearizer Operation2.5.4.2 Instability Detection2.5.5 Control Sub-Module2.5.5.1 Feedback Coupler2.5.5.2 Transmit/Receive Switching2.5.5.3 Dallas Temperature Sensor2.5.6 MHU Power Conditioning & Current Sensor2.5.7 RF Transmission Specifications2.6 Power Supply Module2.6.1 Inputs2.6.2Outputs3.0 Data Receive Unit (DRU)3.1 Overall Description3.2 Concentrator Module3.2.1 Specifications3.3 RF Module3.3.1 Overall Description
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 2 of 333.3.2 RF Modules in RCU and DRU3.3.2.1 Use in RCU3.3.2.2 Use in DRU3.3.3 Dual Synthesizer3.3.4 RF Receiver3.3.5 ADC4.0 Masthead Unit (MHU)4.1 Circuits and Functions4.1.2 Power Conditioning4.1.3 TX/RX Switching4.1.4 Low-Noise Amplifier and Band-Pass Filter4.1.4.1 Low-Noise Amplifier4.1.1.2 Band-PassFilter5.0 Signals & Connections5.1 RCU5.3 RF Module5.4 Baseband Module5.5 Buses5.6 Concentrator Module5.7 Power Supply Module
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 3 of 331.0 Base Station ModulesThe Base Station, which is part of the Central Recording System (CRS), comprises three principalmodules: The Radio Command Unit (RCU), the Data Receive Unit (DRU) and the Mast-Head Unit(MHU). The Central Recording System also contains the Recording Computer.2.0 Radio Command Unit (RCU)2.1 Overall DescriptionFigure 1 shows the names and locations of the various modules in the RCU, together with the Sectionof this text in which they are described.Front View of Radio Command UnitFigure 1Single-Channel Receiver3.3Base-Band Board2.3Clock Generator and Splitter2.4Power Amplifier (Transmitter)2.5Power Supply Unit2.6
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 4 of 33The Radio Command Unit is a Base Station module which houses a single-channel transmitter for theCommand downlink and a single-channel receiver for Command uplinks. The unit also houses theMaster Frequency Reference Generator for the System and provides distribution of both the MasterFrequency Reference and the received RF to multiple Data Receiver Units (DRU).The RCU interfaces with the Recording Computer and the DRUs via a RadioControl Bus (RCB), and provides an interface to the Recording Computer’sdata bus for single-channel seismic data capture.2.3 Baseband ModuleThere is one baseband board in the RCU and up to twelve in the DRU. Each baseband moduleformats data and commands received from its corresponding RF board.2.3.1 Overall DescriptionThe Command baseband module is shown in block form in figure 2. It provides all digital processing forboth the Power Amplifier Module and the Command Receiver in addition to performing recorder controlfunctions.The module receives command and configuration information from the Control Interface Board throughthe Radio Control Bus, and passes Command Unit status information back to the Control InterfaceBoard.The Command Base-Band module consists of four separate sub-modules:DSP and Memory;Digital I/O, RCB, RS232 and Timer;CODEC and Clock Generation; andFPGA and Seismic Data Bus.DSPTMS320C50UARTRS232Bus I/FRadio Control BusCodecDigitalI/OController Digital I/ORAMFLASH Data BusBus I/F Radio Data BusCommand Unit Base-Band Module - Block DiagramFigure 2
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 5 of 332.3.2 Circuits and Functions2.3.2.1 DSP and MemoryThe DSP is a single digital signal processor (type TMS320C50) with ancillary memory and peripherals.This DSP has 16-bit address lines and 16-bit data lines. Its clock is 40.00 MHz, which is obtained fromthe Clock Generation sub-section.There are four 64k X 4 RAM ICs which are used for memory. In addition, a Flash Memory containsconfiguration information for the DSP.DSP outputs include:16 data bits (D0 to D15) which go to the Universal Serial Controller (USC),CODEC-DACDATA connected to the CODEC sub-section, andControl and clock signals for the FPGA, USC, Timer and UART.2.3.2.2 Digital I/O, RCB, RS-232 and Timer (See Schematic ---)The USC (type A16C30V10VSC) interfaces with the DSP through the16-bit data lines (D0-D15).A Master to Slave signal is placed on the RCB to interface with the Command Unit and the DRUs.U35 and associated components form the timer circuitry using the crystal oscillator X2, at a frequencyof 32.768 kHz.Inputs to the Digital I/O circuits from the Command Transmitter board include:Cartesian transmitter instability detector,VSWR alarm indicator, andTransmitter Temperature indicator.Digital outputs include:Synth Serial Data and Synth Serial Data clock to the Synthesizer of the Command RF board.Cartesian loop gain reduction and Cartesian loop dc null control signals to the Cartesian LinearTransmitter of the Command Transmitter board.U36 is a Universal Asynchronous Receiver and Transmitter (UART) which provides an RS232 link fortest purposes.2.3.2.3 CODEC and Clock Generation (See Schematic ---)The CODEC U32 provides A/D conversion of the up-linked I and Q signals to CODEC serial data. Thisserial data is routed to the Command Base-Band board for processing.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 6 of 33The CODEC also performs A/D conversion of the CODEC serial data (from the Command Base-Bandboard) into I and Q Base-Band signals. These I and Q signals are sent to the Power Amplifier Modulefor modulation and transmission.The CODEC clock is 7.68 MHz, and is derived from the 61.44 MHz VCO and the Divide by EightCounter, U21.The P-CLK signal for the DSP is 40 MHz. A jumper selection at Jumper Point JP9, permits selection of40 MHz from either X1 (the internal oscillator) or from the 40 MHz Master Clock from the RF Splitterboard.This sub-section takes the RX-I and RX-Q signals from the Command Receiver board and convertsthem to CODEC serial data to be sent to the DSP for processing.The A/D conversion involves converting the CODEC-DACDATA from the DSP to TX-I and TX-QCartesian Base-Band signals to be fed to the Cartesian Linear Amplifier on the PA Linearizer board.Phase-Control (PH-CTL) signal is also fed to the PA Linear Amplifier to maintain a phase balancebetween the I and Q signals.2.3.2.4 FPGA and Seismic Data Bus (See Schematic ---)U3 is a Field-Programmable Gate Array (FPGA) which contains the I/O and digital logic functions andalso provides the interface between the DSP and the Control Interface Board.2.4. Clock Generator & Splitter Module2.4.1 Overall DescriptionThe two main sub-modules within this board are theRF Signal Splitter and theReference Generator.There are two versions of the Clock Generator & Reference module: one in the RCU and the other ineach DRU.• The Command Unit contains a module which splits the received RF signals 12 ways, for distributionas shown in figure 3.This module generates a 40 MHz controlled-reference clock which is fed to the Command Receiverand to up 11 DRUs.• Each DRU contains a module which serves:• to split the Reference Clock two ways for distribution to the RF and Baseband boards within theDRU and• to split received RF signals twelve ways for distribution to RF boards within the DRU.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 7 of 33Received RF Signal Path showing Distribution Functions of RF SplitterFigure 3As shown in figure 3, the antenna feed to the RCU version of this module comes from the Mast-HeadUnit via the antenna interface, whilst the antenna feed to the DRU version comes from the RF output ofthe Command Unit splitter.2.4.2 RF Splitter Sub-ModuleFigure 4 shows that the RF splitter stages consist ofantenna feed,filter,power division andtwelve 12 dB gain stages.The band-pass filter on the splitter board ensures that no in-band intermodulation is produced by out-of-band energy.The filtered signal is fed into a 12-way splitter. In order to compensate for the insertion loss of thissplitter, a 12 dB (nominal) gain stage is present in each RF output path. This results in 12 RF outputsof a level nominally identical to the RF input level – giving a 0dB gain stage.2.4.3 Clock Reference Generator Sub-ModuleFigure 5 illustrates the differing reference clock configurations of the CU and the DRU splitter variants.In the CU model an on-board highly-stable oven-controlled oscillator provides the referencesignal. The DRU model does not possess this oscillator and requires the clock signal to besourced from the backplane.Mast-HeadUnitAntennaInterface RFSplitterRF Splitter &ReferenceDistributor123456789101112RF andBase-BandBoardsAntennaRFCommandReceiver11 DRUs max 12 RF Boards and12 Base-Band Boardsin each DRUCommand Unit Data Receiver Unit #1To RF & Base-Band Boards234567891011To DRUs1
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 8 of 33The gain stage provides an output of approximately +17 dBm which, when split through a tunedWilkinson power divider, results in a nominal +13 dBm signal at both 40 MHz reference points. The CURF board uses one of the reference signals and the second is used by any connected DRU.RF Splitter StagesFigure 4MINI CIRCUITSPSC-12-11-1 12-WaySplitterMOTOROLAMRF55312dB Gain StagesFilterAntennaRF1RF2RF3RF4RF5RF6RF7RF8RF9RF10RF11RF12DRU ONLY40 MHz Backplane FeedCommand Unit Only40 MHz OCXOdBBPP193 Gain StageWILKINSONPower Divider 40 MHz REF140 MHz REF2Reference GeneratorFigure 5
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 9 of 332.4.4 RCU & DRU Versions of Clock Generator & Splitter ModulesAs has been shown in figure 5, there are two versions of this module. Physical differences are detailedin Table 1.Component Radio Command Unit Data Receiver UnitReference oscillator 40 MHz present Not presentOscillator link Pins 1 & 3 linked Pins 2 & 3 linkedHandle colors Blue BlackClock Generation & Splitter Board: CommandUnit/Data Receiver Unit DifferencesTable 12.5 Power Amplifier Module2.5.1 Overall DescriptionThis module comprises the transmitter that feeds RF to the antenna for downlinking commands to theRemote Units, and is illustrated in figure 6.The module contains three separate sub-modules, all located on the same board:Power Amplifier A three stage power amplifier which provides the RF forward-path gain andfinal output drive for the RCU transmitter.Cartesian Linearizer RF and baseband processing sub-module which provides direct up-conversionof the quadrature baseband input signals, while simultaneously correcting fornon-linearities in the power-amplifier.Control Section This sub-module provides a 20 dB (nominal) RF feedback path to the CartesianLoop Linearizer as well as transmit-receive switching and MHU (masthead)power supply conditioning. Also incorporated are:A temperature sensor,Non-volatile parameter storage,Masthead connection status and VSWR indication.2.5.2 Dedicated ChannelThe RCU downlink requires a single 20 kHz dedicated channel. The transmission of a pilot on thischannel provides a means of waking up the remote units and frequency locking them to the CRS high-stability reference.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 10 of 33Linearized Power Amplifier - Block DiagramFigure 62.5.3 Power Amplifier Sub-ModuleThe PA sub-module comprises the main RF amplifier and provides the forward-path gain and finaloutput drive. This board consists of three ‘Semelab’ device stages, shown in fig. 7.D2019UK D1013UK D1020UK28V @ 250mA23dB Gain 28V @ 750mA23dB Gain 28V @ 1.0A14dB GainPA Device Line-UpFigure 7:Each device is individually tuned for gain and return loss. The whole line-up is tuned to achieve a gainof approximately 60dB.2.5.3.1 DC NullDuring operation of the PA, a steadily rising carrier component exists on the output spectrum, this beinga result of carrier up/down-converter feed-through. It can be seen at baseband as a dc componentsuperimposed on the I and Q signals.PA ControlIQup-converterdown-converterRFamplifier harmonicfilterRFattenuatordBfeedbackgainlowpassfilterlocaloscillator - -φRF phaseshifterdirectionalcouplerRFoutputpre-amplifierLinearizerRF feedback
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 11 of 33This represents an unwanted tone in the output spectrum, and is removed by sampling the magnitudeof dc component at start of transmission and removing it from the resulting dc component 30 secondsafter transmission.2.5.3.2 RF AttenuationTransmitted power can be varied by a series of switchable attenuators situated in the Up- and Down-Converter paths (figure 8), and is also controlled by the feedback gain elements.Increasing the feedback gain reduces the overall output power.To maintain linearization, the attenuator situated in the Up-Converter path must be changed inthe opposite direction to the attenuator in the Down-Converter path..2.5.4 Linearizer Sub-ModuleThe basic layout of the linearizer is shown in fig. 8.Linearizer – Block DiagramFigure 8φdBdBτIQLow-pass filtersLocal OscillatorPhase-shifterDelay LineRF feedback fromDirectional CouplerRFModulationFeedback GainSample and HoldSwitchableattenuatorSwitchableattenuatorUp-ConverterDown-Converter
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 12 of 332.5.4.1 Linearizer OperationA fraction of the transmitted RF signal is fed back from the output by the directional coupler (figures 6 &8), and is then attenuated to reduce the signal to a level suitable for input to the down-converter.The signal is split as shown and down-converted, with two carriers of 90º phase difference yielding the Iand Q baseband signals.Feedback gain is provided by low-noise operational amplifiers (CLC428), and the signal is thensubtracted from the modulation input.The forward path signal is low-pass filtered and pre-amplified at baseband. The baseband signal isthen up-converted with a phase-shifted version of the local oscillator to ensure that the input andfeedback signals are exactly 180° out of phase.2.5.4.2 Instability DetectionTo monitor loop stability during operation, a circuit is provided which measures output spectrum energyaround 200 kHz above the carrier.Any instability causes high frequency components to appear in the output spectrum andcorrespondingly at baseband level.A high-pass filter is used to isolate these higher frequencies which are then fed through anamplitude detector.When the amplitude reaches a preset dc detected level, an instability error is flagged.2.5.5 Control Sub-ModuleThe Control Sub-Module is shown in figure 9.It provides RF feedback from the PA sub-module to the linearizer sub-module, and controlstransmit/receive switching.Another function of this sub-module is to provide data storage of temperature-sensing and amplifier-characterisation information by use of a Dallas temperature sensor and non-volatile memory device2.5.5.1 Feedback CouplerThe Control Sub-Module provides a 20 dB-coupled path. A portion of the output signal, roughly 20dBdown, is sampled providing the feedback signal for the linearizer. A VSWR detection circuit enablescoupled and direct powers to be compared.2.5.5.2 Transmit/Receive SwitchingPIN diodes are used to direct signals from the antenna in receive and to the antenna during transmit.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 13 of 33HarmonicFilter+15/-15VSwitchableSupplyTX/RXAntennaReceivedSignalVREF1VREF2Transmit/ReceiveswitchRF_INResistiveSplitterRF_FBRX_HIRX_LOCurrent-to-VoltageConverterVSWRDALLAS SDASCLControl Sub-Module – Block DiagramFigure 9The diodes may be biased + (RX) or – (TX) by transistor switching between the two voltage rails.The RF path is determined by the biasing of the PIN diodes which, in conjunction with matchingcircuitry, act as RF quarter wavelength sections. These sections have the ability to behave asopen circuits or as 50Ω lines depending on the bias voltage.The bias voltage also supplies masthead power via a dc-coupled link though the Masthead coaxialcable.2.5.5.3 Dallas Temperature SensorThe Dallas sensing device provides a temperature measurement system, with one-second acquisitiontime, the data being read as an integer byte. It also incorporates 256 bytes of non-volatile memory forstoring details unique to the individual amplifier – such as phase control voltages, phase, imagebalance settings, serial number and revision details.2.5.6 MHU Power Conditioning & Current SensingA dc supply rail powers the MHU (masthead unit) via the PA/Masthead coaxial cable.The masthead’s own internal TX/RX switching is biased from this cable and, in Receive, a low-noiseamplifier with a 30 dB gain is powered.The MHU is biased by either a positive or negative supply depending on the logic condition of theTX/RX line.In Transmit, the supply rail is negative, and the pin diodes in the RX path are biased to presentan open-circuit to RF, thereby ensuring that RF signal follows the TX path.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 14 of 33In Receive, the supply rail is positive, and the RX path is enabled by positively-biased pindiodes thereby allowing received RF to follow the RX path.Current sensing is provided to monitor the presence and status of the MHU.When the MHU is in Transmit mode, the current drawn is approximately 50 mA.When the masthead is in Receive mode, the current drawn is approximately 450 mA.Two comparator circuits are employed to give a logic low signal when MHU current is less than 50 mAor greater than 500 mA.The current sensor operates by using a current-to-voltage circuit which monitors the voltage droppedacross a very low-value resistor network. An operational amplifier provides a DC output between 0 and5 V depending on the current drawn. This is fed into two level-set comparators, which provide the logicsignals.2.5.7 RF Transmission SpecificationsAll output powers are defined at the masthead antenna connector.2.5.7.1. RF Output PowerMean: 10 W (+40 dBm +/- 1dB) available at antenna connector2.5.7.2 RF Gain60 dB ± 1 dB nominal2.5.7.3 Supply Voltage+ 28V ± 0.5 V @ 4.0A2.5.7.4 Input Impedance50 Ω nominal2.5.7.5 Third order Intercept Point55 dBc min.(Measurement: two tones with 10 kHz spacing: 38 dBm per tone)2.5.7.6 Harmonics-70 dBc, 10 W cw output2.5.7.7 Spurious-70 dBc, 10 W cw output
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 15 of 332.5.7.8 VSWRStable into 5:1 loads, all angles2.6 Power Supply Module2.6.1 Inputs240 V ac, 50/60 Hz or120 V ac, 50/60 Hz2.6.2 OutputsDc output voltages are given in Table 1.Voltage(V dc) Current(A dc) Line RegulationFor 10% change(%)Load RegulationFor 10-100% change(%)Max Ripple%+5 4< 0.2 < 0.5 < 0.5+15 4< 0.5 < 5 < 2-15 4< 0.5 < 5 < 2+28 10 < 0.5 < 5 < 2PSU Output DC VoltagesTable 23.0 Data Receive Unit (DRU)3.1 Overall DescriptionThe DRU (Data Receive Unit) receives, demodulates, and decodes all seismic-trace data from theseismic sensors and supplies this data through a Concentrator to the Recording Computer.Figure 10 shows the names and locations of modules within each DRU, together with the section of thistext in which they are described:3.2 Concentrator ModuleEach DRU contains one Concentrator board which collects 8 channels of seismic data from each of the12 data receiver board pairs (RF and Baseband boards).The data are buffered and formatted for collection in multiplexed form over the Radio Data Bus (RDB)by the Radio Data Interface board in the recording module (RDB). The Radio Data Interface is undercontrol of the Recording Computer.A simplified functional diagram is shown in figure 11, and a block schematic in figure 12.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 16 of 33The Concentrator polls each of the RF boards in the DRU in turn, waiting for all boards to have dataready for collection. The Concentrator then clocks data out of each RF Board, with each channelrepresented as two 16-bit words, into a FIFO buffer on the back-plane bus. The recording computerthen clocks this data onto the VME bus, with each 32-bit word represented as two 16 bit wordsThe Concentrator module determines which channels the DRU receives. On the front of the Concentratorboard there are two numeric LED displays and one rotor switch (figure 10). The switch is used to set theDRU address from 0 to15.Addresses 0 -10 are used for normal recording,Addresses 11-14 are not used, andAddress 15 is used for single channel recording only.The DRU address is displayed on the Concentrator numeric LED, address 0 being displayed as DRU 1,address 1 as DRU 2, etc.Front View of Data Receiver Unit (DRU)Figure 10Power Supply Unit2.6 RFSplitter2.4 Concentrator3.2 Base-Band Boards2.3 RF Boards3.31 16 67 712 1211 111010 9 98 82 23 34 45 5LED Displays ofDRU Numbers AddressRotor Switch
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 17 of 33Simplified Received Data TransferFigure 11Data Rx 0 Data Rx 11ConcentratorRecording ComputerVME Interface1684DataData Rx Rack AddressRunClkData + Rx Board &Channel AddressControl816ResetDataPresentConcentrator Module – Block SchematicFigure 12Base-BandBoards (12) RFBoards(12) Concentrator Radio DataInterfaceMemoryRecordingComputerVMEBUS
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 18 of 333.2.1 Specifications3.2.1.1 Gain & NoiseGain: For each signal path, 0 dB nominal (independent of the number of properlyterminated outputs).Noise: For each RF signal path < 20 dB.3.2.1.2 Maximum Input PowerRF input: +10 dBm, 1 dB compression.3.2.1.3 Third Order Intercept PointRF input: ≥ +36 dBm.3.2.1.2 Reference Signals40 MHz Oscillator: Stability < 1 ppm (used in CU splitter card only)40MHz ref. output #1: Level 13 dBm40MHz ref. output #2: Level 13 dBm40 MHz ref. input: Input level 13 dBm (used in DRU splitter board only).3.3 RF Module3.3.1 Overall DescriptionThe RF module provides the RF receive chain for uplinks from remote units to the CRS. This board isused in two racks:One RF module board is used in the RCU, andup to 12 RF module boards are used in each DRU. Each of these RF boards is used inconjunction with an associated DRU board, also located in the DRU.The module contains an ac-coupled direct-conversion receiver suitable for 16QAM data. The boardalso incorporates the RF synthesizer, which is used in both the receiver and the command unittransmitter.Principal functions are summarized as follows:RF Receiver The receiver provides linear direct down-conversion from the RF channelfrequency to quadrature baseband outputs.Dual Synthesizer One synthesizer provides a Local Oscillator (LO) for both the receiversub-module and the command transmitter module. The other syntheziserprovides the clock for the ADCs. The synthesizer reference is derivedfrom the CRS high-stability source.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 19 of 33ADC The ADC (Analog to Digital Converter)serves to digitize the receivedbaseband I and Q signals. The resulting data are output serially.DownConverterLow-noisegain stagesDualsynthesizerRF_INLOdriverADCs SERIALDATAA/D clock PA LODIVIDEBY 4DIVIDEBY 440MHzREF+27 dBm LO856-936 MHz92.16 MHz 23.04 MHz214-234 MHzActivefilters Finalgain stageRF (Receiver) BoardFigure 133.3.2 RF Module in RCU and DRU3.3.2.1 Use in RCUWhen used in the radio command unit, the Baseband I and Q signals are output, and the ADCs are notused.In this mode, the receiver receives a single 20 kHz channel, which is digitized by the RCU Unitbaseband module (reference Section 2.3). It should be noted that the dual-synthesizer. In the RFmodule is programmed by the Baseband board.The LO signals are used by the receiver down-conversion process and output to the RCU PowerAmplifier (Transmitter) module.3.3.2.2 Use in DRUWhen used in a DRU, each RF module is used in conjunction with its own associated basebandmodule in the DRU.Each RF module is used to receive up to 8 contiguous 20 kHz channels,The analog to digital converters (ADC) operate at a sampling rate of 180 kHz to convert the basebandI and Q signals and output the result as a serial data stream to the DRU Baseband board.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 20 of 33The DRU Baseband board programs the dual synthesizer. The LO signals are used only by thereceiver down-conversion process.3.3.3 Dual SynthesizerThe dual synthesizer package enables the clock signals of both the down-converter LO and the ADC tobe derived from the single oven-controlled stable source provided by the CRS splitter.Serial programming of the LMX2332 enables 10 kHz steps from 216.01 to 213.99 MHz to besynthesized. The synthesizer design employs an 856-936 MHz VCO running at four times the RFdown-conversion frequency. As can be seen in figure 13, a divide-by-four stage reduces the LO signalfrequency to the required band.The RF LO is fed into a Wilkinson power dividerOne output of this divider supplies a nominally 0 dBm LO for use by the PA module.The other output is fed through an amplifier to a Semelab D2081UK, which provides a +27dBm LO. This LO is used by the high third order intercept-point down-converter (Mini-CircuitsJSIQ-234DH1).The ADC clock is derived in a similar manner, with the VCO constructed from discrete components andagain running at four times the required frequency. A 92.16 MHz signal is produced which is fed into adivide-by-four stage, whose output is a square wave which serves as the ADC clock.3.3.4 RF ReceiverThe RF board provides the RF receive path for the command data up-link. As previously stated,demodulation is achieved through an ac-coupled direct conversion.The RF signal received by the antenna, after passing through the low-noise amplifier of the MHU andthe 0 dB-gain stage of the splitter module, is band-pass filtered and fed into the down-converter. Thisreceived signal is then mixed with the +27 dBm LO, producing the I and Q baseband signals. The I andQ signals are then fed into a low-noise gain stage, with a voltage gain of about 10.The baseband signals next pass though an active filter chain, with a roll-off from 80 to 140 kHz.The final stage involves amplitude and phase balancing, followed by another low noise gain stage.If the RF module is in the RCU, the I and Q signals are fed directly to the baseband board via50Ω coaxial.If the moduleis in a DRU, the I and Q signals are connected directly to the ADC.3.3.5 ADCThe I and Q baseband signals are dc-coupled into the ADC16471 ADCs, which operate in amaster/slave configuration. Both I and Q output signals are multiplexed together on a single serial dataline.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 21 of 334.0 Masthead Unit (MHU)Figure 14 is a simplified functional diagram of the Mast-Head Unit, showing the four main sub-modules:Power conditioningTX/RX switchingBand-pass filterLow-Noise Amplifier (LNA)Masthead Unit – Functional DiagramFigure 144.1 Circuits and Functions4.1.2 Power ConditioningThe dc supply for the masthead unit is routed through the command unit coaxial cable.When the command unit is in Transmit (TX) mode, the supply voltage on the coaxial is –15 V.When the command unit is in Receive (RX mode), the supply voltage on the coaxial is +15V.Biasing of the low-noise amplifier (LNA) FET devices is provided by an LT1261CS, which ensures thedrain supply is switched off until the gate voltage is valid. This results in the gate voltage beingsufficiently high to keep the FET switched off during power up, thereby preventing unsaturatedoperation and excessive current draw.A comparator circuit monitors the magnitude of the gate voltage and only applies the drain when thegate has reached approximately –1 V.4.1.3 TX/RX SwitchingThe polarity of the supply voltage controls the combination of pin diode switches (MACOM MA504-30),in the RF path.AntennaTX / RxPINSwitchPowerConditioningTx / RxPINSwitchBand PassFilter2-Stage Low- NoiseAmplifer (LNA)CRSInterconnect
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 22 of 33When supply voltage is +15 V (RX), the only RF path which does not appear as an open circuitis the Low-Noise Amplifier/Band-Pass Filter. This stage is therefore able to amplify and filter theincoming signal..When the supply voltage is –15 V (TX), the Low-Noise Amplifier/Band-Pass Filter stageappears as an open circuit to RF, and is therefore by-passed by the transmission signal.4.1.4 Low-Noise Amplifier and Band-Pass Filter4.1.4.1 Low-Noise AmplifierThe masthead unit provides the first gain stage of the receiver chain and has a very low noise and highdynamic range characteristic.The gain stages are provided by two Philips FET1905s. As can be seen from figure 1, a two-stage line-up is used with the high-rejection Band-Pass Filter (BFP) between the stages.4.1.4.2 Band-Pass FilterThe masthead receive path includes the high rejection Band-Pass Filter connected between the twolow-noise gain stages. The purpose of this filter is to remove any out-of-band spurious signal whichcould give rise to inter-modulation products within the received band.5.0 Signals & Connections5.1 RCU5.1.1 ConnectorsExternal connectors to the Power Amplifier Command Transmitter are defined in table 1.ConnectorName DescriptionH1 LO input - 5-way D-type Combo RF insertH2 I & Q and data line inputs - 15-way D-typeH3 Power and RF input/output - 9-way D-type Combo RF & power insertsH4 Power and signal lines - 9-way D-typeExternal ConnectorsTable 15.1.2 Internal InterfacesTable 2 lists the internal interface signals, which are present between the Power Amplifier and theLinearizer sub-modules.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 23 of 33SignalName From To Type DescriptionRF_MOD CLT PA RF Low power RF input to PARF_FB PA CLT RF Feed back signal for linearizerRF_OUT PA CB RF RF power outputTX_EN LB PA Data Transmit enableInternal InterfacesTable 25.1.3 External InterfacesTable 3 shows the signal interfaces between the Power Amplifier board and the rest of the CommandUnit.Signal Direction Type Description-15V In Power -15V Power supply+28V In Power +28V Power supply to Control Board+28V In Power +28V Power supply to PA (4.0 A)AGND In Power Analog groundTX_RF In/Out RF Transmitter RF output / Receiver RF input via MastheadI_IN_AC In Analog Baseband I channel inputAGND In Power Analog ground for Linearizer boardQ_IN_AC In Analog Baseband Q channel inputSHDN In Digital Enables PA (from DSP) – used for CLT dc-nulling5dB_UP In Digital HCMOS power control, up converter: 5dB step5dB_DOWN In Digital HCMOS power control, down converter: 5dB step10dB_ATT In Digital HCMOS power control: 10dB step15dB_ATT In Digital HCMOS power control: 20dB stepPH_CTL In Analog Cartesian loop phase controlDC_NULL In Digital Cartesian loop dc null controlINSTB Out Digital Transmitter instability detectorVSWR Out Digital VSWR alarm indicator+15V In Power +15V power for Cartesian loopTX_RX In Digital Switches between Tx & Rx modeTX_EN In Digital Disables the PA during a DC Null operation.SCL In Digital Temperature sensor data clockSDA In/Out Digital Temperature sensor bi-directional data lineRX_I_HI Out Digital Indication of masthead unit condition connection/statusRX_I_LOW Out Digital Indication of masthead unit condition connection/statusRX_RF Out RF Received RF from Tx/Rx switchLO_TX In RF Local oscillator input 0dBmExternal Interface SignalsTable 35.1.4 Voltage Inputs240 V ac, 50/60 Hz or120 V ac, 50/60 Hz
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 24 of 335.1.5 Voltage OutputsDc output voltages are listed in Table 4.Voltage(Volts dc) Current(Amps dc) Line RegulationFor 10% change(%)Load RegulationFor 10-100% change(%)MaxRipple%+5 4< 0.2 < 0.5 < 0.5+15 4< 0.5 < 5 < 2-15 4< 0.5 < 5 < 2+28 10 < 0.5 < 5 < 2PSU Output DC VoltagesTable 45.2 Reference Generator & Splitter Board5.2.1 External ConnectionsTable 5 lists the signals which constitute the interfaces between the Splitter Board module and theRadio Command Unit or Data Receiver Unit.Signal Direction DescriptionRF_IN In RF input signalRF1 Out RF1 Split signalRF2 Out RF2 Split signalRF3 Out RF3 Split signalAGND In Analog groundDGND In Digital ground+5V In Logic supply rail40MHZ_IN In 40MHz Reference signal (DRU only)-15V In Supply monitor input rail+15V In RF Supply rail+28V In Supply monitor input railRF4 Out RF4 Split signalRF5 In RF5 Split signalRF6 Out RF6 Split signalRF7 Out RF7 Split signalAGND In Analog groundRF8 In RF8 Split signalRF9 Out RF9 Split signalRF10 Out RF10 Split signalRF11 Out RF11 Split signalDGND In Digital ground+5V In Logic supply rail-15V In Supply monitorContinued overleaf
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 25 of 33Signal Direction Description+15V In RF Supply railRF12 Out RF12 Split signal40MHZ_REF#1 Out 40MHz Reference signal40MHZ_REF#2 Out 40MHz Reference signalExternal Interface SignalsTable 55.3 RF Module5.3.1 ConnectorsThe connectors for the RF module are defined in Table 6.Connector Name DescriptionH1 Connector to back plane -DIN41612M 60 + 4 plugs (pins and coax inserts)ConnectorsTable 65.3.2 InputsTable 7 defines the external input signals for the RF module.Signal Connector Type Description+15V H1: A-C15 Power Power supply-15V H1: A-C14 Power Power supply+5V H1: A-C8 Power Power supplyDGND H1: A-C7 Power Digital groundAGND H1: A-C9;A-C10;A-C12;A-C13 Power Analog groundS_CLK H1: A-C20 HCMOS Synth. serial data clockS_DATA H1: A-C21 HCMOS Synth. serial dataS_LE H1: A-C22 HCMOS Synth. load enable(CU)REF H1: A-C11 RF +13dBm reference input(DRU)REF H1: B2 RF +13dBm reference inputRX_RF H1: B31 RF Received signal inputDOE H1: A-C26 HCMOS ADC’s data output enableFSI H1: A-C23 HCMOS ADCs frame sync inputExternal InputsTable 7
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 26 of 335.3.3 OutputsTable 8 defines the external output signals for the RF board.Signal Name Connector Type DescriptionSDO H1: A-C24 HCMOS ADCs serial data outputSCO H1: A-C25 HCMOS ADCs serial clock output(CU)I_RX H1: B2 Baseband Baseband I channel output(CU)Q_RX H1: B5 Baseband Baseband Q channel outputTX_LO H1: B28 RF 0 dBm LO output CU transmitterExternal OutputsTable 85.3.4 IndicatorsIndicators on the RF module are defined in table 9.Indicator Name Color DescriptionLED1 Yellow +5V analog supply (internally generated)LED2 Yellow +12V analog supplyLED3 Yellow -5V analog supply (internally generated)LED4 Yellow +5V analog supply (internally generated)LED5 Green Synthesizer Lock DetectIndicatorsTable 95.3.5 Internal ConnectionsInternal connections within the RF board are defined in table 10.Signal Name From To Type DescriptionF_CLK Synth ADC Digital ADC 20.48 MHz clockLO_+27dBm Synth RX RF Local oscillator for Command ReceiverInternal Interface SignalsTable 10
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 27 of 335.4 Baseband Module Board5.4.1 Power SignalsThese signals are described in Table 7.Signal Name Direction Connector Type DescriptionAGND In P1:A1,C1,A3,C3,A4,C4,A6,C6A9,B9,C9,A10,B10,C10,A12,B12,C12,A13,B13,C13,A27,C27,A29,C29,A30,C30,A32,C32Power Analog GroundDGND In P1:A7,B7,C7P2:A1,B1,C1 Power Digital ground+5V In P1:A8,B8,C8 Power Power supply5V +/- 5%+15V In P1:A15,B15,C15 Power Power supply15V +/- 5%Power SignalsTable 115.4.2 Analog SignalsThese are described in Table 12.SignalName Direction Connector Type Description40 MHz In P1:A11,B11,C11 Analog 40 MHz Clock at +13 dBmRX_I In P1:B2 Analog I input from receiver2.8 V p-p into AC coupled inputRX_Q In P1:B5 Analog Q input from receiver2.8 V p-p into AC Coupled inputTX_I Out P2:C32 Analog I output from transmitter 0.7 to 3.5 VTX_Q Out P2:C32 Analog Q output from transmitter 0.7 to 3.5 VAnalog SignalsTable 12
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 28 of 335.4.3 Digital Control SignalsThese signals are defined in Table 13.Signal Name Direction Connector Type DescriptionS_CLK Out P1: A20 HCMS Synthesizer ClockS_DATA Out P1: A21 HCMS Synthesizer dataS_LERF Out P1: A22 HCMS RF Synthesizer enable LOW = Enable, HIGH = DISABLEIN#1 In P2:C2 TTL Spare inputIN#2 In P2:C3 TTL Spare inputIN#3 In P2:C4 TTL Spare inputIN#4 In P2:C5 TTL Spare inputOUT#1 Out P2:C6 HCMS Spare Output / Data Detect LEDLED Out P2:C7 TTL LED Output20DB_ATT Out P2:C14 HCMS Transmitter 20 dB Attenuator LOW = Switch in, HIGH = switch out10DB_ATT Out P2:C15 HCMS Transmitter 10 dB AttenuatorLOW = Switch in, HIGH = switch out5DB_DOWN Out P2:C16 HCMS Transmitter 5 dB Down AttenuatorLOW = Switch out, HIGH = switch in5DB_UP Out P2:C17 HCMS Transmitter 5 dB Up AttenuatorLOW = Switch in, HIGH = switch outT_SCL Out P2:C18 TTL Temperature sensor ClockTX_EN Out P2:C19 HCMS Transmit enableLOW = enable, HIGH = DisableTX_RX Out P2:C20 HCMS Transmit/receive switchLOW = Receive, HIGH = TransmitRX_I_HI In P2:C21 TTL Masthead over currentLOW = Over current, HIGH = Current OKRX_I_LO In P2:C22 TTL Masthead under currentLOW = Under current, HIGH = Current OKT_SDA In/Out P2:C23 TTL Temperature sensor dataVSWR In P2:C24 TTL Max VSWR exceeded (TBD - VSWR exceeded)INSTB In P2:C25 TTL Transmitter unstableLOW = Unstable, HIGH = not unstableDC_NULL Out P2:C26 HCMOS Transmitter DC NullLOW = Null, HIGH = Normal transmitSHDN Out P2:C28 HCMOS Shut down Cartesian LoopLOW = Disable, HIGH =enable Cartesian LoopDigital Control SignalsTable 135.5 Buses5.5.1. Radio Control BusThe Radio Control Bus consists of an RS485 interface, and is used to control the command unit base-band board.The various input and output signals are described in Table 14.
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 29 of 33Signal Name Direction Connector Type DescriptionDID Input P1:A16 Analog SpareDIDR Output P1:B16 Analog SpareTZ+, TZ- Input P1:A17,B17 RS485 Message Trigger (Differential)MS+,MS- Input P1:18,B18 RS485 Master - Slave signaling (Differential)SM+,SM- Output P1:A19,B19 RS485 Slave - Master signaling (Differential)Radio Control BusTable 145.5.2 Radio Data BusThe radio data bus is used to output seismic data received over the radio link.The inputs and outputs are differential with each path of the differential signal having TTL Logic levels.The various signals handled by this bus are described in Table 15.Signal Name Direction Connector(P2) Type DescriptionVA0+,VA0- In A2,B2 Differential Address bit 0VA1+,VA1- In A3,B3 Differential Address bit 1VA2+,VA2- In A4,B4 Differential Address bit 2VA3+,VA3- In A5,B5 Differential Address bit 3VCLK+,VCLK- In A6,B6 Differential ClockVRUN+,VRUN- In A7,B7 Differential Run signalVDP+,VDP- Out A8,B8 Differential Data PresentVD0+,VD0- Out A10,B10 Differential Data bit 0VD1+,VD1- Out A11,B11 Differential Data bit 1VD2+,VD2- Out A12,B12 Differential Data bit 2VD3+,VD3- Out A13,B13 Differential Data bit 3VD4+,VD4- Out A14,B14 Differential Data bit 4VD5+,VD5- Out A15,B15 Differential Data bit 5VD6+,VD6- Out A16,B16 Differential Data bit 6VD7+,VD7- Out A17,B17 Differential Data bit 7VD8+,VD8- Out A18,B18 Differential Data bit 8VD9+,VD9- Out A19,B19 Differential Data bit 9VD10+,VD10- Out A20,B20 Differential Data bit 10VD11+,VD11- Out A21,B21 Differential Data bit 11VD12+,VD12- Out A22,B22 Differential Data bit 12VD13+,VD13- Out A23,B23 Differential Data bit 13VD14+,VD14- Out A24,B24 Differential Data bit 14VD15+,VD15- Out A25,B25 Differential Data bit 15CONN In A26 Digital Unit connected forwardRET Out B26 Digital Unit connected returnRadio Data BusTable 15
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 30 of 335.5.3 RS232Signal Name Direction Connector Type DescriptionGND in H4 pin 5 Power RS232 GroundRXD Out H4 pin 2 RS232 RS232 Receive DataTXD In H4 pin 3 RS232 RS232 Transmit DataDTR In H4 pin 4 RS232 RS232 Data Terminal ReadyDSR Out H4 pin 6 RS232 RS232 Data Set ReadyRTS In H4 pin 7 RS232 RS232 Ready To SendCTS Out H4 pin 8 RS232 RS232 Clear To SendRS232 SignalsTable 165.6 Concentrator5.6.1 ConnectorsThe connectors for the Concentrator are defined in Table 17.Connector Name DescriptionH1 Connector to Data Receive Unit back planeDIN41612 Type C (96 way male)H2 Connector to Data Receive Unit back planeDIN41612 Type C (96 way male)ConnectorsTable 175.6.2 InputsTable 18 defines the input signals for the Concentrator module.SignalName Connector Type Description+5V H1, pins 2a, 2b, 2cH2, pins 2a, 2b, 2c Power Main 5V supply+15V H1, pins 9a, 9b, 9cH2, pins 9a, 9b, 9c Power Main +15V supply-15V H1, pins 8a, 8b, 8cH2, pins 8a, 8b, 8c Power Main -15V supplyDGND H1, pins 1a, 1b, 1c,H2, pins 1a, 1b, 1c Power Digital groundAGND H1, pins 3a, 3b, 3c4a, 4b, 4c6a, 6b, 6c7a, 7b, 7cH2, pins 3a, 3b, 3c4a, 4b, 4c6a, 6b, 6c7a, 7b, 7cPower Analog GroundContinued Overleaf
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 31 of 33DRxD0 H1, pin 14c TTL Seismic data input bit 0DRxD1 H1, pin 15a TTL Seismic data input bit 1DRxD2 H1, pin 15b TTL Seismic data input bit 2DRxD3 H1, pin 15c TTL Seismic data input bit 3DRxD4 H1, pin 16a TTL Seismic data input bit 4DRxD5 H1, pin 16b TTL Seismic data input bit 5DRxD6 H1, pin 16c TTL Seismic data input bit 6DRxD7 H1, pin 17a TTL Seismic data input bit 7DRxD8 H1, pin 17b TTL Seismic data input bit 8DRxD9 H1, pin 17c TTL Seismic data input bit 9DRxD10 H1, pin 18a TTL Seismic data input bit 10DRxD11 H1, pin 18b TTL Seismic data input bit 11DRxD12 H1, pin 18c TTL Seismic data input bit 12DRxD13 H1, pin 19a TTL Seismic data input bit 13DRxD14 H1, pin 19b TTL Seismic data input bit 14DRxD15 H1, pin 19c TTL Seismic data input bit 15DRxP H1, pin 13b TTL Data Rx presentHigh: Card fittedLow: Card not fittedDRxDP H1, pin 13c TTL Data Rx data availableHigh: Data availableLow: Data not availableDRxO H1, pin 14a TTL Data Rx data o/p bufferoverflow1High: Buffer overflowLow : Buffer OK40MHz In H1, 5a, 5b, 5c Analog 40.0MHz clock at +13 dBmVA0+ H2, pin 10a Differential RDB Rack address bit 0VA0- H2, pin 10b Differential RDB Rack address bit 0VA1+ H2, pin 11a Differential RDB Rack address bit 1VA1- H2, pin 11b Differential RDB Rack address bit 1VA2+ H2, pin 12a Differential RDB Rack address bit 2VA2- H2, pin 12b Differential RDB Rack address bit 2VA3+ H2, pin 13a Differential RDB Rack address bit 3VA3- H2, pin 13b Differential RDB Rack address bit 3VClk+ H2, pin 14a Differential RDB I/F data clockData is clocked into recordingcomputer on rising edge.VClk- H2, pin 14b Differential RDB I/F data clockVRun+ H2, pin 15a Differential RDB I/F Run controlHigh: During data transfersLow: OtherwiseVRun- H2, pin 15b Differential RDB I/F Run controlVreset+ H2, pin 17a Differential Concentrator resetVreset- H2, pin 17b Differential Concentrator reset/DRxRdy H1, pin 14b TTL Data receiver ready for DMAdata transferLow: ready, High: Not readyBIB_EN H1, pin 20a TTL Enable RCB slave masteroutput, wire-or from DRUsActive LowExternal Input Table 18
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 32 of 335.6.3 OutputsTable 19 defines the output signals for the Concentrator board.Signal Name Connector Type DescriptionVDP+ H2, pin 16a Differential Data present flagHigh: Data available for readingLow: No data availableVDP- H2, pin 16b Differential Data available flagVD0+ H2, pin 18a Differential RDB Data bit 0VD0- H2, pin 18b Differential RDB Data bit 0VD1+ H2, pin 19a Differential RDB Data bit 1VD1- H2, pin 19b Differential RDB Data bit 1VD2+ H2, pin 20a Differential RDB Data bit 2VD2- H2, pin 21a Differential RDB Data bit 2VD3+ H2, pin 22a Differential RDB Data bit 3VD3- H2, pin 23a Differential RDB Data bit 3VD4+ H2, pin 24a Differential RDB Data bit 4VD4- H2, pin 24b Differential RDB Data bit 4VD5+ H2, pin 25a Differential RDB Data bit 5VD5- H2, pin 25b Differential RDB Data bit 5VD6+ H2, pin 26a Differential RDB Data bit 6VD6- H2, pin 26b Differential RDB Data bit 6VD7+ H2, pin 25c Differential RDB Data bit 7VD7- H2, pin 26c Differential RDB Data bit 7VD8+ H2, pin 27a Differential RDB Data bit 8VD8- H2, pin 27b Differential RDB Data bit 8VD9- H2, pin 28b Differential RDB Data bit 9VD10+ H2, pin 27c Differential RDB Data bit 10VD10- H2, pin 28c Differential RDB Data bit 10VD11+ H2, pin 29a Differential RDB Data bit 11VD11- H2, pin 29b Differential RDB Data bit 11VD12+ H2, pin 30a Differential RDB Data bit 12VD12- H2, pin 30b Differential RDB Data bit 12VD13+ H2, pin 29c Differential RDB Data bit 13VD13- H2, pin 29d Differential RDB Data bit 13VD14+ H2, pin 31a Differential RDB Data bit 14VD14- H2, pin 31b Differential RDB Data bit 14VD15+ H2, pin 32a Differential RDB Data bit 15VD15- H2, pin 32b Differential RDB Data bit 15/DRxReq H1, pin 10a TTL Data Receiver DMA requestLow: RequestHigh: No requestDRxClk H1, pin 10b TTL Clocks data out of the buffer on DataRF board on rising edge and intoFIFO on the falling edge.DRxA0 H1, pin 10c TTL Address line 0 for channel dataDRxA1 H1, pin 11a TTL Address line 1 for channel dataDRxA2 H1, pin 11b TTL Address line 2 for channel dataDRxA3 H1, pin 11c TTL Address line 3 for channel dataDRxA4 H1, pin 12a TTL Address line 4 for channel dataContinued Overleaf
THE BOX - Base Station Application for FCC Certification Operating ManualAppendix 5 Page 33 of 33DRxA5 H1, pin 12b TTL Address line 5 for channel dataDRxA6 H1, pin 12c TTL Address line 6 for channel dataDRxA7 H1, pin 13a TTL Address line 7 for channel dataExternal OutputsTable 195.6.4 Bi-directional SignalsTable 20 lists the external bi-directional interface signals for the Concentrator.SignalName Connector DescriptionSM#1+ H1 pin 31a To SMU ( SM2 buffered from DRUs)SM#1- H1 pin 31b To SMU ( SM2 buffered from DRUs)MS#1+ H1 pin 30a From SMU, (buffer to DRUs)MS#1- H1 pin 30b From SMU, (buffer to DRUs)SM#2+ H1 pin 20b From DRUs (buffer to SMU)SM#2- H1 pin 20c From DRUs (buffer to SMU)MS#2+ H1 pin 21b To DRUs (MS1 buffered from SMU)MS#2- H1 pin 21c To DRUs (MS1 buffered from SMU)SM#3+ H2 pin 21b Termination input for SM2SM#3- H2 pin 20c Termination input for SM2MS#3+ H2 pin 21b Termination input for MS2MS#3- H2 pin 21c Termination input for MS2External Bi-Directional RCB Interface SignalsTable 205.7 Power Supply Module5.7.1 Inputs240 V ac, 50/60 Hz or120 V ac, 50/60 Hz.5.7.2 OutputsDC output voltages are summarized in Table 21.Voltage(V dc) Current(A dc) Line RegulationFor 10% change(%)Load RegulationFor 10-100% change(%)MaxRipple%+ 5 50 < 0.2 < 0.5 < 0.5+15 8< 0.5 < 10.0 < 2.0-15 8< 0.5 < 10.0 < 2.0PSU Output VoltagesTable 2

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