Fairfield BOX-BASE Geophysical Data Telemetry System User Manual BS App 5
Fairfield Industries Inc Geophysical Data Telemetry System BS App 5
Operating Manual
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| Document ID | 91376 |
| Application ID | O+O4JHX3cVtPVcEZO83FgQ== |
| Document Description | Operating Manual |
| Short Term Confidential | No |
| Permanent Confidential | No |
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| Document Type | User Manual |
| Display Format | Adobe Acrobat PDF - pdf |
| Filesize | 34.89kB (436078 bits) |
| Date Submitted | 2000-03-15 00:00:00 |
| Date Available | 2000-04-10 00:00:00 |
| Creation Date | 0000-00-00 00:00:00 |
| Producing Software | Acrobat PDFWriter 3.02 for Windows |
| Document Lastmod | 2000-03-03 12:47:10 |
| Document Title | BS App 5.pdf |
| Document Creator | Microsoft Word |
| Document Author: | Unknown |
THE BOX - Base Station Operating Manual Application for FCC Certification Appendix 5 Base Station Radio System Appendix 5 Page 0 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification Appendix 5 Contents 1.0 Base Station Modules 2.0 2.1 2.3 3.3.1 2.3.2 2.3.2.2 2.3.2.2 2.3.2.3 2.3.2.4 2.4 2.4.1 2.4.2 2.4.3 2.4.4 Radio Command Unit (RCU) Overall Description Baseband Module Overall Description Circuits and Function DSP and Memory Digital I/O, RCB. RS-232 and Timer Codec and Clock Generation FPGA and Seismic Data Bus Clock Generator and Splitter Module Overall Description RF Splitter Sub-Module Clock Reference Generator Sub-Module RCU and DRU Versions 2.5 2.5.1 2.5.3 2.5.3.1 2.5.3.2 2.5.4 2.5.4.1 2.5.4.2 2.5.5 2.5.5.1 2.5.5.2 2.5.5.3 2.5.6 2.5.7 Power Amplifier Module Overall Description Power Amplifier Sub-Module DC Null RF Attenuation Linearizer Sub-Module Linearizer Operation Instability Detection Control Sub-Module Feedback Coupler Transmit/Receive Switching Dallas Temperature Sensor MHU Power Conditioning & Current Sensor RF Transmission Specifications 2.6 2.6.1 2.6.2 Power Supply Module Inputs Outputs 3.0 3.1 3.2 3.2.1 Data Receive Unit (DRU) Overall Description Concentrator Module Specifications 3.3 3.3.1 RF Module Overall Description Appendix 5 Page 1 of 33 THE BOX - Base Station Operating Manual 3.3.2 Application for FCC Certification RF Modules in RCU and DRU 3.3.2.1 Use in RCU 3.3.2.2 Use in DRU 3.3.3 Dual Synthesizer 3.3.4 RF Receiver 3.3.5 ADC 4.0 4.1 4.1.2 4.1.3 4.1.4 4.1.4.1 4.1.1.2 Masthead Unit (MHU) Circuits and Functions Power Conditioning TX/RX Switching Low-Noise Amplifier and Band-Pass Filter Low-Noise Amplifier Band-PassFilter 5.0 5.1 5.3 5.4 5.5 5.6 5.7 Signals & Connections RCU RF Module Baseband Module Buses Concentrator Module Power Supply Module Appendix 5 Page 2 of 33 THE BOX - Base Station Operating Manual 1.0 Application for FCC Certification Base Station Modules The Base Station, which is part of the Central Recording System (CRS), comprises three principal modules: 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 Description Figure 1 shows the names and locations of the various modules in the RCU, together with the Section of this text in which they are described. Single-Channel Receiver 3.3 Clock Generator and Splitter 2.4 Base-Band Board 2.3 Power Supply Unit 2.6 Power Amplifier (Transmitter) 2.5 Front View of Radio Command Unit Figure 1 Appendix 5 Page 3 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification The Radio Command Unit is a Base Station module which houses a single-channel transmitter for the Command downlink and a single-channel receiver for Command uplinks. The unit also houses the Master Frequency Reference Generator for the System and provides distribution of both the Master Frequency Reference and the received RF to multiple Data Receiver Units (DRU). The RCU interfaces with the Recording Computer and the DRUs via a Radio Control Bus (RCB), and provides an interface to the Recording Computer’s data bus for single-channel seismic data capture. 2.3 Baseband Module There is one baseband board in the RCU and up to twelve in the DRU. Each baseband module formats data and commands received from its corresponding RF board. 2.3.1 Overall Description The Command baseband module is shown in block form in figure 2. It provides all digital processing for both the Power Amplifier Module and the Command Receiver in addition to performing recorder control functions. The module receives command and configuration information from the Control Interface Board through the Radio Control Bus, and passes Command Unit status information back to the Control Interface Board. The Command Base-Band module consists of four separate sub-modules: Radio Control Bus RS232 Bus I/F Codec DSP and Memory; Digital I/O, RCB, RS232 and Timer; CODEC and Clock Generation; and FPGA and Seismic Data Bus. Bus I/F Radio Data Bus UART DSP TMS320C50 RAM Digital I/O Controller FLASH Data Bus Command Unit Base-Band Module - Block Diagram Figure 2 Appendix 5 Page 4 of 33 Digital I/O THE BOX - Base Station Operating Manual 2.3.2 Circuits and Functions 2.3.2.1 DSP and Memory Application for FCC Certification The 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 from the Clock Generation sub-section. There are four 64k X 4 RAM ICs which are used for memory. In addition, a Flash Memory contains configuration 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, and Control 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 frequency of 32.768 kHz. Inputs to the Digital I/O circuits from the Command Transmitter board include: Cartesian transmitter instability detector, VSWR alarm indicator, and Transmitter 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 Linear Transmitter of the Command Transmitter board. U36 is a Universal Asynchronous Receiver and Transmitter (UART) which provides an RS232 link for test 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. This serial data is routed to the Command Base-Band board for processing. Appendix 5 Page 5 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification The CODEC also performs A/D conversion of the CODEC serial data (from the Command Base-Band board) into I and Q Base-Band signals. These I and Q signals are sent to the Power Amplifier Module for modulation and transmission. The CODEC clock is 7.68 MHz, and is derived from the 61.44 MHz VCO and the Divide by Eight Counter, U21. The P-CLK signal for the DSP is 40 MHz. A jumper selection at Jumper Point JP9, permits selection of 40 MHz from either X1 (the internal oscillator) or from the 40 MHz Master Clock from the RF Splitter board. This sub-section takes the RX-I and RX-Q signals from the Command Receiver board and converts them 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-Q Cartesian 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 balance between 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 and also provides the interface between the DSP and the Control Interface Board. 2.4. Clock Generator & Splitter Module 2.4.1 Overall Description The two main sub-modules within this board are the RF Signal Splitter and the Reference Generator. There are two versions of the Clock Generator & Reference module: one in the RCU and the other in each DRU. • The Command Unit contains a module which splits the received RF signals 12 ways, for distribution as shown in figure 3. This module generates a 40 MHz controlled-reference clock which is fed to the Command Receiver and 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 the DRU and • to split received RF signals twelve ways for distribution to RF boards within the DRU. Appendix 5 Page 6 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification Antenna Data Receiver Unit #1 Command Unit MastHead Unit To DRUs Antenna Interface RF Splitter RF Command Receiver RF Splitter & Reference Distributor To RF & BaseBand Boards 10 11 11 DRUs max RF and Base-Band Boards 10 11 12 12 RF Boards and 12 Base-Band Boards in each DRU Received RF Signal Path showing Distribution Functions of RF Splitter Figure 3 As shown in figure 3, the antenna feed to the RCU version of this module comes from the Mast-Head Unit via the antenna interface, whilst the antenna feed to the DRU version comes from the RF output of the Command Unit splitter. 2.4.2 RF Splitter Sub-Module Figure 4 shows that the RF splitter stages consist of antenna feed, filter, power division and twelve 12 dB gain stages. The band-pass filter on the splitter board ensures that no in-band intermodulation is produced by out-ofband energy. The filtered signal is fed into a 12-way splitter. In order to compensate for the insertion loss of this splitter, a 12 dB (nominal) gain stage is present in each RF output path. This results in 12 RF outputs of a level nominally identical to the RF input level – giving a 0dB gain stage. 2.4.3 Clock Reference Generator Sub-Module Figure 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 reference signal. The DRU model does not possess this oscillator and requires the clock signal to be sourced from the backplane. Appendix 5 Page 7 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification The gain stage provides an output of approximately +17 dBm which, when split through a tuned Wilkinson power divider, results in a nominal +13 dBm signal at both 40 MHz reference points. The CU RF board uses one of the reference signals and the second is used by any connected DRU. MOTOROLA MRF553 12dB Gain Stages Antenna RF1 RF2 RF3 RF4 Filter RF5 MINI CIRCUITS PSC-12-11-1 RF6 12-Way Splitter RF7 RF8 RF9 RF10 RF11 RF12 RF Splitter Stages Figure 4 WILKINSON Power Divider Command Unit Only 40 MHz OCXO 40 MHz REF1 BPP193 Gain Stage dB 40 MHz REF2 DRU ONLY 40 MHz Backplane Feed Reference Generator Figure 5 Appendix 5 Page 8 of 33 THE BOX - Base Station Operating Manual 2.4.4 Application for FCC Certification RCU & DRU Versions of Clock Generator & Splitter Modules As has been shown in figure 5, there are two versions of this module. Physical differences are detailed in Table 1. Component Reference oscillator Oscillator link Handle colors Radio Command Unit 40 MHz present Pins 1 & 3 linked Blue Data Receiver Unit Not present Pins 2 & 3 linked Black Clock Generation & Splitter Board: CommandUnit/Data Receiver Unit Differences Table 1 2.5 Power Amplifier Module 2.5.1 Overall Description This module comprises the transmitter that feeds RF to the antenna for downlinking commands to the Remote 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 and final output drive for the RCU transmitter. Cartesian Linearizer RF and baseband processing sub-module which provides direct up-conversion of the quadrature baseband input signals, while simultaneously correcting for non-linearities in the power-amplifier. Control Section 2.5.2 This sub-module provides a 20 dB (nominal) RF feedback path to the Cartesian Loop 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. Dedicated Channel The RCU downlink requires a single 20 kHz dedicated channel. The transmission of a pilot on this channel provides a means of waking up the remote units and frequency locking them to the CRS highstability reference. Appendix 5 Page 9 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification PA Linearizer lowpass filter preamplifier upconverter Control RF amplifier harmonic filter RF output directional coupler φ RF feedback RF phase shifter local oscillator dB feedback gain downconverter RF attenuator Linearized Power Amplifier - Block Diagram Figure 6 2.5.3 Power Amplifier Sub-Module The PA sub-module comprises the main RF amplifier and provides the forward-path gain and final output drive. This board consists of three ‘Semelab’ device stages, shown in fig. 7. D2019UK 28V @ 250mA 23dB Gain D1013UK 28V @ 750mA 23dB Gain D1020UK 28V @ 1.0A 14dB Gain PA Device Line-Up Figure 7: Each device is individually tuned for gain and return loss. The whole line-up is tuned to achieve a gain of approximately 60dB. 2.5.3.1 DC Null During operation of the PA, a steadily rising carrier component exists on the output spectrum, this being a result of carrier up/down-converter feed-through. It can be seen at baseband as a dc component superimposed on the I and Q signals. Appendix 5 Page 10 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification This represents an unwanted tone in the output spectrum, and is removed by sampling the magnitude of dc component at start of transmission and removing it from the resulting dc component 30 seconds after transmission. 2.5.3.2 RF Attenuation Transmitted power can be varied by a series of switchable attenuators situated in the Up- and DownConverter 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 in the opposite direction to the attenuator in the Down-Converter path.. 2.5.4 Linearizer Sub-Module The basic layout of the linearizer is shown in fig. 8. UpConverter Sample and Hold Switchable attenuator Low-pass filters dB RF Modulation φ Phase-shifter τ Delay Line Local Oscillator Switchable attenuator dB Feedback Gain DownConverter Linearizer – Block Diagram Figure 8 Appendix 5 Page 11 of 33 RF feedback from Directional Coupler THE BOX - Base Station Operating Manual 2.5.4.1 Application for FCC Certification Linearizer Operation A 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 I and Q baseband signals. Feedback gain is provided by low-noise operational amplifiers (CLC428), and the signal is then subtracted from the modulation input. The forward path signal is low-pass filtered and pre-amplified at baseband. The baseband signal is then up-converted with a phase-shifted version of the local oscillator to ensure that the input and feedback signals are exactly 180° out of phase. 2.5.4.2 Instability Detection To monitor loop stability during operation, a circuit is provided which measures output spectrum energy around 200 kHz above the carrier. Any instability causes high frequency components to appear in the output spectrum and correspondingly at baseband level. A high-pass filter is used to isolate these higher frequencies which are then fed through an amplitude detector. When the amplitude reaches a preset dc detected level, an instability error is flagged. 2.5.5 Control Sub-Module The Control Sub-Module is shown in figure 9. It provides RF feedback from the PA sub-module to the linearizer sub-module, and controls transmit/receive switching. Another function of this sub-module is to provide data storage of temperature-sensing and amplifiercharacterisation information by use of a Dallas temperature sensor and non-volatile memory device 2.5.5.1 Feedback Coupler The Control Sub-Module provides a 20 dB-coupled path. A portion of the output signal, roughly 20dB down, is sampled providing the feedback signal for the linearizer. A VSWR detection circuit enables coupled and direct powers to be compared. 2.5.5.2 Transmit/Receive Switching PIN diodes are used to direct signals from the antenna in receive and to the antenna during transmit. Appendix 5 Page 12 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification Antenna Received Signal Transmit/Receive switch RF_IN Harmonic Filter VREF1 Resistive Splitter VSWR SDA DALLAS SCL RF_FB RX_HI +15/-15V Switchable Supply TX/RX Current-to-Voltage Converter RX_LO VREF2 Control Sub-Module – Block Diagram Figure 9 The 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 matching circuitry, act as RF quarter wavelength sections. These sections have the ability to behave as open 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 coaxial cable. 2.5.5.3 Dallas Temperature Sensor The Dallas sensing device provides a temperature measurement system, with one-second acquisition time, the data being read as an integer byte. It also incorporates 256 bytes of non-volatile memory for storing details unique to the individual amplifier – such as phase control voltages, phase, image balance settings, serial number and revision details. 2.5.6 MHU Power Conditioning & Current Sensing A 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-noise amplifier with a 30 dB gain is powered. The MHU is biased by either a positive or negative supply depending on the logic condition of the TX/RX line. In Transmit, the supply rail is negative, and the pin diodes in the RX path are biased to present an open-circuit to RF, thereby ensuring that RF signal follows the TX path. Appendix 5 Page 13 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification In Receive, the supply rail is positive, and the RX path is enabled by positively-biased pin diodes 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 mA or greater than 500 mA. The current sensor operates by using a current-to-voltage circuit which monitors the voltage dropped across a very low-value resistor network. An operational amplifier provides a DC output between 0 and 5 V depending on the current drawn. This is fed into two level-set comparators, which provide the logic signals. 2.5.7 RF Transmission Specifications All output powers are defined at the masthead antenna connector. 2.5.7.1. RF Output Power Mean: 10 W (+40 dBm +/- 1dB) available at antenna connector 2.5.7.2 RF Gain 60 dB ± 1 dB nominal 2.5.7.3 Supply Voltage + 28V ± 0.5 V @ 4.0A 2.5.7.4 Input Impedance 50 Ω nominal 2.5.7.5 Third order Intercept Point 55 dBc min. (Measurement: two tones with 10 kHz spacing: 38 dBm per tone) 2.5.7.6 Harmonics -70 dBc, 10 W cw output 2.5.7.7 Spurious -70 dBc, 10 W cw output Appendix 5 Page 14 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification 2.5.7.8 VSWR Stable into 5:1 loads, all angles 2.6 Power Supply Module 2.6.1 Inputs 240 V ac, 50/60 Hz or 120 V ac, 50/60 Hz 2.6.2 Outputs Dc output voltages are given in Table 1. Voltage (V dc) Current (A dc) +5 +15 -15 +28 10 Line Regulation For 10% change (%) < 0.2 < 0.5 < 0.5 < 0.5 Load Regulation For 10-100% change (%) < 0.5 <5 <5 <5 Max Ripple < 0.5 <2 <2 <2 PSU Output DC Voltages Table 2 3.0 Data Receive Unit (DRU) 3.1 Overall Description The DRU (Data Receive Unit) receives, demodulates, and decodes all seismic-trace data from the seismic 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 this text in which they are described: 3.2 Concentrator Module Each DRU contains one Concentrator board which collects 8 channels of seismic data from each of the 12 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 under control of the Recording Computer. A simplified functional diagram is shown in figure 11, and a block schematic in figure 12. Appendix 5 Page 15 of 33 THE BOX - Base Station Operating Manual Power Supply Unit 2.6 RFSplitter 2.4 Application for FCC Certification Concentrator 3.2 LED Displays of DRU Numbers Base-Band Boards 2.3 RF Boards 3.3 12 11 10 10 11 12 Address Rotor Switch Front View of Data Receiver Unit (DRU) Figure 10 The Concentrator polls each of the RF boards in the DRU in turn, waiting for all boards to have data ready for collection. The Concentrator then clocks data out of each RF Board, with each channel represented as two 16-bit words, into a FIFO buffer on the back-plane bus. The recording computer then clocks this data onto the VME bus, with each 32-bit word represented as two 16 bit words The Concentrator module determines which channels the DRU receives. On the front of the Concentrator board there are two numeric LED displays and one rotor switch (figure 10). The switch is used to set the DRU address from 0 to15. Addresses 0 -10 are used for normal recording, Addresses 11-14 are not used, and Address 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. Appendix 5 Page 16 of 33 THE BOX - Base Station Operating Manual Base-Band Boards (12) Application for FCC Certification RF Boards(12) Concentrator Radio Data Interface VME BUS Recording Computer Memory Simplified Received Data Transfer Figure 11 Data Rx 0 Data Rx 11 Data + Rx Board & Channel Address Reset 16 Concentrator Control Data Present 16 Data Data Rx Rack Address Run Clk Concentrator Module – Block Schematic Figure 12 Appendix 5 Page 17 of 33 Recording Computer VME Interface THE BOX - Base Station Operating Manual 3.2.1 Specifications 3.2.1.1 Gain & Noise Gain: Noise: 3.2.1.2 +10 dBm, 1 dB compression. Third Order Intercept Point RF input: 3.2.1.2 For each signal path, 0 dB nominal (independent of the number of properly terminated outputs). For each RF signal path < 20 dB. Maximum Input Power RF input: 3.2.1.3 Application for FCC Certification ≥ +36 dBm. Reference Signals 40 MHz Oscillator: Stability < 1 ppm (used in CU splitter card only) 40MHz ref. output #1: Level 13 dBm 40MHz ref. output #2: Level 13 dBm 40 MHz ref. input: 3.3 RF Module 3.3.1 Overall Description Input level 13 dBm (used in DRU splitter board only). The RF module provides the RF receive chain for uplinks from remote units to the CRS. This board is used in two racks: One RF module board is used in the RCU, and up to 12 RF module boards are used in each DRU. Each of these RF boards is used in conjunction with an associated DRU board, also located in the DRU. The module contains an ac-coupled direct-conversion receiver suitable for 16QAM data. The board also incorporates the RF synthesizer, which is used in both the receiver and the command unit transmitter. Principal functions are summarized as follows: RF Receiver Dual Synthesizer The receiver provides linear direct down-conversion from the RF channel frequency to quadrature baseband outputs. One synthesizer provides a Local Oscillator (LO) for both the receiver sub-module and the command transmitter module. The other syntheziser provides the clock for the ADCs. The synthesizer reference is derived from the CRS high-stability source. Appendix 5 Page 18 of 33 THE BOX - Base Station Operating Manual ADC Application for FCC Certification The ADC (Analog to Digital Converter)serves to digitize the received baseband I and Q signals. The resulting data are output serially. Down Converter Low-noise gain stages RF_IN Active filters Final gain stage ADCs SERIAL DATA LO driver 214-234 MHz +27 dBm LO DIVIDE BY 4 PA LO 856-936 MHz 40MHz REF 92.16 MHz Dual synthesizer DIVIDE BY 4 A/D clock 23.04 MHz RF (Receiver) Board Figure 13 3.3.2 RF Module in RCU and DRU 3.3.2.1 Use in RCU When used in the radio command unit, the Baseband I and Q signals are output, and the ADCs are not used. In this mode, the receiver receives a single 20 kHz channel, which is digitized by the RCU Unit baseband module (reference Section 2.3). It should be noted that the dual-synthesizer. In the RF module is programmed by the Baseband board. The LO signals are used by the receiver down-conversion process and output to the RCU Power Amplifier (Transmitter) module. 3.3.2.2 Use in DRU When used in a DRU, each RF module is used in conjunction with its own associated baseband module 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 baseband I and Q signals and output the result as a serial data stream to the DRU Baseband board. Appendix 5 Page 19 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification The DRU Baseband board programs the dual synthesizer. The LO signals are used only by the receiver down-conversion process. 3.3.3 Dual Synthesizer The dual synthesizer package enables the clock signals of both the down-converter LO and the ADC to be 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 be synthesized. The synthesizer design employs an 856-936 MHz VCO running at four times the RF down-conversion frequency. As can be seen in figure 13, a divide-by-four stage reduces the LO signal frequency to the required band. The RF LO is fed into a Wilkinson power divider One 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 +27 dBm LO. This LO is used by the high third order intercept-point down-converter (Mini-Circuits JSIQ-234DH1). The ADC clock is derived in a similar manner, with the VCO constructed from discrete components and again running at four times the required frequency. A 92.16 MHz signal is produced which is fed into a divide-by-four stage, whose output is a square wave which serves as the ADC clock. 3.3.4 RF Receiver The 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 and the 0 dB-gain stage of the splitter module, is band-pass filtered and fed into the down-converter. This received signal is then mixed with the +27 dBm LO, producing the I and Q baseband signals. The I and Q 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 via 50Ω coaxial. If the moduleis in a DRU, the I and Q signals are connected directly to the ADC. 3.3.5 ADC The I and Q baseband signals are dc-coupled into the ADC16471 ADCs, which operate in a master/slave configuration. Both I and Q output signals are multiplexed together on a single serial data line. Appendix 5 Page 20 of 33 THE BOX - Base Station Operating Manual 4.0 Application for FCC Certification Masthead Unit (MHU) Figure 14 is a simplified functional diagram of the Mast-Head Unit, showing the four main sub-modules: Power conditioning TX/RX switching Band-pass filter Low-Noise Amplifier (LNA) Power Conditioning CRS Interconnect TX / Rx PIN Switch Band Pass Filter Tx / Rx PIN Switch Antenna 2-Stage Low- Noise Amplifer (LNA) Masthead Unit – Functional Diagram Figure 14 4.1 Circuits and Functions 4.1.2 Power Conditioning The 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 the drain supply is switched off until the gate voltage is valid. This results in the gate voltage being sufficiently high to keep the FET switched off during power up, thereby preventing unsaturated operation and excessive current draw. A comparator circuit monitors the magnitude of the gate voltage and only applies the drain when the gate has reached approximately –1 V. 4.1.3 TX/RX Switching The polarity of the supply voltage controls the combination of pin diode switches (MACOM MA504-30), in the RF path. Appendix 5 Page 21 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification When supply voltage is +15 V (RX), the only RF path which does not appear as an open circuit is the Low-Noise Amplifier/Band-Pass Filter. This stage is therefore able to amplify and filter the incoming signal.. When the supply voltage is –15 V (TX), the Low-Noise Amplifier/Band-Pass Filter stage appears as an open circuit to RF, and is therefore by-passed by the transmission signal. 4.1.4 Low-Noise Amplifier and Band-Pass Filter 4.1.4.1 Low-Noise Amplifier The masthead unit provides the first gain stage of the receiver chain and has a very low noise and high dynamic range characteristic. The gain stages are provided by two Philips FET1905s. As can be seen from figure 1, a two-stage lineup is used with the high-rejection Band-Pass Filter (BFP) between the stages. 4.1.4.2 Band-Pass Filter The masthead receive path includes the high rejection Band-Pass Filter connected between the two low-noise gain stages. The purpose of this filter is to remove any out-of-band spurious signal which could give rise to inter-modulation products within the received band. 5.0 Signals & Connections 5.1 RCU 5.1.1 Connectors External connectors to the Power Amplifier Command Transmitter are defined in table 1. Connector Name H1 H2 H3 H4 Description LO input - 5-way D-type Combo RF insert I & Q and data line inputs - 15-way D-type Power and RF input/output - 9-way D-type Combo RF & power inserts Power and signal lines - 9-way D-type External Connectors Table 1 5.1.2 Internal Interfaces Table 2 lists the internal interface signals, which are present between the Power Amplifier and the Linearizer sub-modules. Appendix 5 Page 22 of 33 THE BOX - Base Station Operating Manual Signal Name RF_MOD RF_FB RF_OUT TX_EN Application for FCC Certification From To Type Description CLT PA PA LB PA CLT CB PA RF RF RF Data Low power RF input to PA Feed back signal for linearizer RF power output Transmit enable Internal Interfaces Table 2 5.1.3 External Interfaces Table 3 shows the signal interfaces between the Power Amplifier board and the rest of the Command Unit. Signal -15V +28V +28V AGND TX_RF I_IN_AC AGND Q_IN_AC SHDN 5dB_UP 5dB_DOWN 10dB_ATT 15dB_ATT PH_CTL DC_NULL INSTB VSWR +15V TX_RX TX_EN SCL SDA RX_I_HI RX_I_LOW RX_RF LO_TX Direction In In In In In/Out In In In In In In In In In In Out Out In In In In In/Out Out Out Out In Type Power Power Power Power RF Analog Power Analog Digital Digital Digital Digital Digital Analog Digital Digital Digital Power Digital Digital Digital Digital Digital Digital RF RF Description -15V Power supply +28V Power supply to Control Board +28V Power supply to PA (4.0 A) Analog ground Transmitter RF output / Receiver RF input via Masthead Baseband I channel input Analog ground for Linearizer board Baseband Q channel input Enables PA (from DSP) – used for CLT dc-nulling HCMOS power control, up converter: 5dB step HCMOS power control, down converter: 5dB step HCMOS power control: 10dB step HCMOS power control: 20dB step Cartesian loop phase control Cartesian loop dc null control Transmitter instability detector VSWR alarm indicator +15V power for Cartesian loop Switches between Tx & Rx mode Disables the PA during a DC Null operation. Temperature sensor data clock Temperature sensor bi-directional data line Indication of masthead unit condition connection/status Indication of masthead unit condition connection/status Received RF from Tx/Rx switch Local oscillator input 0dBm External Interface Signals Table 3 5.1.4 Voltage Inputs 240 V ac, 50/60 Hz or 120 V ac, 50/60 Hz Appendix 5 Page 23 of 33 THE BOX - Base Station Operating Manual 5.1.5 Application for FCC Certification Voltage Outputs Dc output voltages are listed in Table 4. Voltage (Volts dc) Current (Amps dc) +5 +15 -15 +28 10 Line Regulation For 10% change (%) < 0.2 < 0.5 < 0.5 < 0.5 Load Regulation For 10-100% change (%) < 0.5 <5 <5 <5 Max Ripple < 0.5 <2 <2 <2 PSU Output DC Voltages Table 4 5.2 Reference Generator & Splitter Board 5.2.1 External Connections Table 5 lists the signals which constitute the interfaces between the Splitter Board module and the Radio Command Unit or Data Receiver Unit. Signal RF_IN RF1 RF2 RF3 AGND DGND +5V 40MHZ_IN -15V +15V +28V RF4 RF5 RF6 RF7 AGND RF8 RF9 RF10 RF11 DGND +5V -15V Direction Description In RF input signal Out RF1 Split signal Out RF2 Split signal Out RF3 Split signal In Analog ground In Digital ground In Logic supply rail In 40MHz Reference signal (DRU only) In Supply monitor input rail In RF Supply rail In Supply monitor input rail Out RF4 Split signal In RF5 Split signal Out RF6 Split signal Out RF7 Split signal In Analog ground In RF8 Split signal Out RF9 Split signal Out RF10 Split signal Out RF11 Split signal In Digital ground In Logic supply rail In Supply monitor Continued overleaf Appendix 5 Page 24 of 33 THE BOX - Base Station Operating Manual Signal +15V RF12 40MHZ_REF#1 40MHZ_REF#2 Application for FCC Certification Direction In Out Out Out Description RF Supply rail RF12 Split signal 40MHz Reference signal 40MHz Reference signal External Interface Signals Table 5 5.3 RF Module 5.3.1 Connectors The connectors for the RF module are defined in Table 6. Connector Name H1 Description Connector to back plane DIN41612M 60 + 4 plugs (pins and coax inserts) Connectors Table 6 5.3.2 Inputs Table 7 defines the external input signals for the RF module. Signal +15V -15V +5V DGND AGND S_CLK S_DATA S_LE (CU)REF (DRU)REF RX_RF DOE FSI Connector H1: A-C15 H1: A-C14 H1: A-C8 H1: A-C7 H1: A-C9;A-C10;A-C12;A-C13 H1: A-C20 H1: A-C21 H1: A-C22 H1: A-C11 H1: B2 H1: B31 H1: A-C26 H1: A-C23 Type Power Power Power Power Power HCMOS HCMOS HCMOS RF RF RF HCMOS HCMOS External Inputs Table 7 Appendix 5 Page 25 of 33 Description Power supply Power supply Power supply Digital ground Analog ground Synth. serial data clock Synth. serial data Synth. load enable +13dBm reference input +13dBm reference input Received signal input ADC’s data output enable ADCs frame sync input THE BOX - Base Station Operating Manual 5.3.3 Application for FCC Certification Outputs Table 8 defines the external output signals for the RF board. Signal Name SDO SCO (CU)I_RX (CU)Q_RX TX_LO Connector H1: A-C24 H1: A-C25 H1: B2 H1: B5 H1: B28 Type HCMOS HCMOS Baseband Baseband RF Description ADCs serial data output ADCs serial clock output Baseband I channel output Baseband Q channel output 0 dBm LO output CU transmitter External Outputs Table 8 5.3.4 Indicators Indicators on the RF module are defined in table 9. Indicator Name LED1 LED2 LED3 LED4 LED5 Color Yellow Yellow Yellow Yellow Green Description +5V analog supply (internally generated) +12V analog supply -5V analog supply (internally generated) +5V analog supply (internally generated) Synthesizer Lock Detect Indicators Table 9 5.3.5 Internal Connections Internal connections within the RF board are defined in table 10. Signal Name F_CLK LO_+27dBm From Synth Synth To ADC RX Type Digital RF Description ADC 20.48 MHz clock Local oscillator for Command Receiver Internal Interface Signals Table 10 Appendix 5 Page 26 of 33 THE BOX - Base Station Operating Manual 5.4 Baseband Module Board 5.4.1 Power Signals Application for FCC Certification These signals are described in Table 7. Signal Name AGND Direction In Type Power Description Analog Ground Power Digital ground In Connector P1:A1,C1,A3,C3,A4,C4, A6,C6 A9,B9,C9,A10,B10,C10, A12,B12,C12,A13,B13,C 13,A27,C27,A29,C29,A3 0,C30,A32,C32 P1:A7,B7,C7 P2:A1,B1,C1 P1:A8,B8,C8 DGND In +5V Power In P1:A15,B15,C15 Power Power supply 5V +/- 5% Power supply 15V +/- 5% +15V Power Signals Table 11 5.4.2 Analog Signals These are described in Table 12. Signal Name 40 MHz RX_I Direction Connector Type Description In In P1:A11,B11,C11 P1:B2 Analog Analog RX_Q In P1:B5 Analog TX_I TX_Q Out Out P2:C32 P2:C32 Analog Analog 40 MHz Clock at +13 dBm I input from receiver 2.8 V p-p into AC coupled input Q input from receiver 2.8 V p-p into AC Coupled input I output from transmitter 0.7 to 3.5 V Q output from transmitter 0.7 to 3.5 V Analog Signals Table 12 Appendix 5 Page 27 of 33 THE BOX - Base Station Operating Manual 5.4.3 Application for FCC Certification Digital Control Signals These signals are defined in Table 13. Signal Name S_CLK S_DATA S_LERF Direction Out Out Out Connector P1: A20 P1: A21 P1: A22 Type HCMS HCMS HCMS IN#1 IN#2 IN#3 IN#4 OUT#1 LED 20DB_ATT In In In In Out Out Out P2:C2 P2:C3 P2:C4 P2:C5 P2:C6 P2:C7 P2:C14 TTL TTL TTL TTL HCMS TTL HCMS 10DB_ATT Out P2:C15 HCMS 5DB_DOWN Out P2:C16 HCMS 5DB_UP Out P2:C17 HCMS T_SCL TX_EN Out Out P2:C18 P2:C19 TTL HCMS TX_RX Out P2:C20 HCMS RX_I_HI In P2:C21 TTL RX_I_LO In P2:C22 TTL T_SDA VSWR In/Out In P2:C23 P2:C24 TTL TTL INSTB In P2:C25 TTL DC_NULL Out P2:C26 HCMOS SHDN Out P2:C28 HCMOS Description Synthesizer Clock Synthesizer data RF Synthesizer enable LOW = Enable, HIGH = DISABLE Spare input Spare input Spare input Spare input Spare Output / Data Detect LED LED Output Transmitter 20 dB Attenuator LOW = Switch in, HIGH = switch out Transmitter 10 dB Attenuator LOW = Switch in, HIGH = switch out Transmitter 5 dB Down Attenuator LOW = Switch out, HIGH = switch in Transmitter 5 dB Up Attenuator LOW = Switch in, HIGH = switch out Temperature sensor Clock Transmit enable LOW = enable, HIGH = Disable Transmit/receive switch LOW = Receive, HIGH = Transmit Masthead over current LOW = Over current, HIGH = Current OK Masthead under current LOW = Under current, HIGH = Current OK Temperature sensor data Max VSWR exceeded (TBD - VSWR exceeded) Transmitter unstable LOW = Unstable, HIGH = not unstable Transmitter DC Null LOW = Null, HIGH = Normal transmit Shut down Cartesian Loop LOW = Disable, HIGH =enable Cartesian Loop Digital Control Signals Table 13 5.5 Buses 5.5.1. Radio Control Bus The Radio Control Bus consists of an RS485 interface, and is used to control the command unit baseband board. The various input and output signals are described in Table 14. Appendix 5 Page 28 of 33 THE BOX - Base Station Operating Manual Signal Name DID DIDR TZ+, TZMS+,MSSM+,SM- Direction Input Output Input Input Output Application for FCC Certification Connector P1:A16 P1:B16 P1:A17,B17 P1:18,B18 P1:A19,B19 Type Analog Analog RS485 RS485 RS485 Description Spare Spare Message Trigger (Differential) Master - Slave signaling (Differential) Slave - Master signaling (Differential) Radio Control Bus Table 14 5.5.2 Radio Data Bus The 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 VA0+,VA0VA1+,VA1VA2+,VA2VA3+,VA3VCLK+,VCLKVRUN+,VRUNVDP+,VDPVD0+,VD0VD1+,VD1VD2+,VD2VD3+,VD3VD4+,VD4VD5+,VD5VD6+,VD6VD7+,VD7VD8+,VD8VD9+,VD9VD10+,VD10VD11+,VD11VD12+,VD12VD13+,VD13VD14+,VD14VD15+,VD15CONN RET In In In In In In Out Out Out Out Out Out Out Out Out Out Out Out Out Out Out Out Out In Out Connector (P2) A2,B2 A3,B3 A4,B4 A5,B5 A6,B6 A7,B7 A8,B8 A10,B10 A11,B11 A12,B12 A13,B13 A14,B14 A15,B15 A16,B16 A17,B17 A18,B18 A19,B19 A20,B20 A21,B21 A22,B22 A23,B23 A24,B24 A25,B25 A26 B26 Type Description Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Differential Digital Digital Address bit 0 Address bit 1 Address bit 2 Address bit 3 Clock Run signal Data Present Data bit 0 Data bit 1 Data bit 2 Data bit 3 Data bit 4 Data bit 5 Data bit 6 Data bit 7 Data bit 8 Data bit 9 Data bit 10 Data bit 11 Data bit 12 Data bit 13 Data bit 14 Data bit 15 Unit connected forward Unit connected return Radio Data Bus Table 15 Appendix 5 Page 29 of 33 THE BOX - Base Station Operating Manual 5.5.3 Application for FCC Certification RS232 Signal Name GND RXD TXD DTR DSR RTS CTS Direction in Out In In Out In Out Connector H4 pin 5 H4 pin 2 H4 pin 3 H4 pin 4 H4 pin 6 H4 pin 7 H4 pin 8 Type Power RS232 RS232 RS232 RS232 RS232 RS232 Description RS232 Ground RS232 Receive Data RS232 Transmit Data RS232 Data Terminal Ready RS232 Data Set Ready RS232 Ready To Send RS232 Clear To Send RS232 Signals Table 16 5.6 Concentrator 5.6.1 Connectors The connectors for the Concentrator are defined in Table 17. Connector Name H1 H2 Description Connector to Data Receive Unit back plane DIN41612 Type C (96 way male) Connector to Data Receive Unit back plane DIN41612 Type C (96 way male) Connectors Table 17 5.6.2 Inputs Table 18 defines the input signals for the Concentrator module. Signal Name +5V +15V -15V DGND AGND Connector Type H1, pins 2a, 2b, 2c Power H2, pins 2a, 2b, 2c H1, pins 9a, 9b, 9c Power H2, pins 9a, 9b, 9c H1, pins 8a, 8b, 8c Power H2, pins 8a, 8b, 8c H1, pins 1a, 1b, 1c, Power H2, pins 1a, 1b, 1c H1, pins 3a, 3b, 3c Power 4a, 4b, 4c 6a, 6b, 6c 7a, 7b, 7c H2, pins 3a, 3b, 3c 4a, 4b, 4c 6a, 6b, 6c 7a, 7b, 7c Continued Overleaf Description Main 5V supply Main +15V supply Main -15V supply Digital ground Analog Ground Appendix 5 Page 30 of 33 THE BOX - Base Station Operating Manual Application for FCC Certification DRxD0 DRxD1 DRxD2 DRxD3 DRxD4 DRxD5 DRxD6 DRxD7 DRxD8 DRxD9 DRxD10 DRxD11 DRxD12 DRxD13 DRxD14 DRxD15 DRxP H1, pin 14c H1, pin 15a H1, pin 15b H1, pin 15c H1, pin 16a H1, pin 16b H1, pin 16c H1, pin 17a H1, pin 17b H1, pin 17c H1, pin 18a H1, pin 18b H1, pin 18c H1, pin 19a H1, pin 19b H1, pin 19c H1, pin 13b TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL TTL DRxDP H1, pin 13c TTL DRxO H1, pin 14a TTL 40MHz In VA0+ VA0VA1+ VA1VA2+ VA2VA3+ VA3VClk+ H1, 5a, 5b, 5c H2, pin 10a H2, pin 10b H2, pin 11a H2, pin 11b H2, pin 12a H2, pin 12b H2, pin 13a H2, pin 13b H2, pin 14a Analog Differential Differential Differential Differential Differential Differential Differential Differential Differential VClkVRun+ H2, pin 14b H2, pin 15a Differential Differential VRunVreset+ Vreset/DRxRdy H2, pin 15b H2, pin 17a H2, pin 17b H1, pin 14b Differential Differential Differential TTL BIB_EN H1, pin 20a TTL Seismic data input bit 0 Seismic data input bit 1 Seismic data input bit 2 Seismic data input bit 3 Seismic data input bit 4 Seismic data input bit 5 Seismic data input bit 6 Seismic data input bit 7 Seismic data input bit 8 Seismic data input bit 9 Seismic data input bit 10 Seismic data input bit 11 Seismic data input bit 12 Seismic data input bit 13 Seismic data input bit 14 Seismic data input bit 15 Data Rx present High: Card fitted Low: Card not fitted Data Rx data available High: Data available Low: Data not available Data Rx data o/p buffer overflow1 High: Buffer overflow Low : Buffer OK 40.0MHz clock at +13 dBm RDB Rack address bit 0 RDB Rack address bit 0 RDB Rack address bit 1 RDB Rack address bit 1 RDB Rack address bit 2 RDB Rack address bit 2 RDB Rack address bit 3 RDB Rack address bit 3 RDB I/F data clock Data is clocked into recording computer on rising edge. RDB I/F data clock RDB I/F Run control High: During data transfers Low: Otherwise RDB I/F Run control Concentrator reset Concentrator reset Data receiver ready for DMA data transfer Low: ready, High: Not ready Enable RCB slave master output, wire-or from DRUs Active Low External Input Table 18 Appendix 5 Page 31 of 33 THE BOX - Base Station Operating Manual 5.6.3 Application for FCC Certification Outputs Table 19 defines the output signals for the Concentrator board. Signal Name VDP+ Connector H2, pin 16a VDPVD0+ VD0VD1+ VD1VD2+ VD2VD3+ VD3VD4+ VD4VD5+ VD5VD6+ VD6VD7+ VD7VD8+ VD8VD9VD10+ VD10VD11+ VD11VD12+ VD12VD13+ VD13VD14+ VD14VD15+ VD15/DRxReq H2, pin 16b H2, pin 18a H2, pin 18b H2, pin 19a H2, pin 19b H2, pin 20a H2, pin 21a H2, pin 22a H2, pin 23a H2, pin 24a H2, pin 24b H2, pin 25a H2, pin 25b H2, pin 26a H2, pin 26b H2, pin 25c H2, pin 26c H2, pin 27a H2, pin 27b H2, pin 28b H2, pin 27c H2, pin 28c H2, pin 29a H2, pin 29b H2, pin 30a H2, pin 30b H2, pin 29c H2, pin 29d H2, pin 31a H2, pin 31b H2, pin 32a H2, pin 32b H1, pin 10a DRxClk H1, pin 10b DRxA0 DRxA1 DRxA2 DRxA3 DRxA4 H1, pin 10c H1, pin 11a H1, pin 11b H1, pin 11c H1, pin 12a Type Differential Description Data present flag High: Data available for reading Low: No data available Differential Data available flag Differential RDB Data bit 0 Differential RDB Data bit 0 Differential RDB Data bit 1 Differential RDB Data bit 1 Differential RDB Data bit 2 Differential RDB Data bit 2 Differential RDB Data bit 3 Differential RDB Data bit 3 Differential RDB Data bit 4 Differential RDB Data bit 4 Differential RDB Data bit 5 Differential RDB Data bit 5 Differential RDB Data bit 6 Differential RDB Data bit 6 Differential RDB Data bit 7 Differential RDB Data bit 7 Differential RDB Data bit 8 Differential RDB Data bit 8 Differential RDB Data bit 9 Differential RDB Data bit 10 Differential RDB Data bit 10 Differential RDB Data bit 11 Differential RDB Data bit 11 Differential RDB Data bit 12 Differential RDB Data bit 12 Differential RDB Data bit 13 Differential RDB Data bit 13 Differential RDB Data bit 14 Differential RDB Data bit 14 Differential RDB Data bit 15 Differential RDB Data bit 15 TTL Data Receiver DMA request Low: Request High: No request TTL Clocks data out of the buffer on Data RF board on rising edge and into FIFO on the falling edge. TTL Address line 0 for channel data TTL Address line 1 for channel data TTL Address line 2 for channel data TTL Address line 3 for channel data TTL Address line 4 for channel data Continued Overleaf Appendix 5 Page 32 of 33 THE BOX - Base Station Operating Manual DRxA5 DRxA6 DRxA7 H1, pin 12b H1, pin 12c H1, pin 13a Application for FCC Certification TTL TTL TTL Address line 5 for channel data Address line 6 for channel data Address line 7 for channel data External Outputs Table 19 5.6.4 Bi-directional Signals Table 20 lists the external bi-directional interface signals for the Concentrator. Signal Name SM#1+ SM#1MS#1+ MS#1SM#2+ SM#2MS#2+ MS#2SM#3+ SM#3MS#3+ MS#3- Connector Description H1 pin 31a H1 pin 31b H1 pin 30a H1 pin 30b H1 pin 20b H1 pin 20c H1 pin 21b H1 pin 21c H2 pin 21b H2 pin 20c H2 pin 21b H2 pin 21c To SMU ( SM2 buffered from DRUs) To SMU ( SM2 buffered from DRUs) From SMU, (buffer to DRUs) From SMU, (buffer to DRUs) From DRUs (buffer to SMU) From DRUs (buffer to SMU) To DRUs (MS1 buffered from SMU) To DRUs (MS1 buffered from SMU) Termination input for SM2 Termination input for SM2 Termination input for MS2 Termination input for MS2 External Bi-Directional RCB Interface Signals Table 20 5.7 Power Supply Module 5.7.1 Inputs 240 V ac, 50/60 Hz or 120 V ac, 50/60 Hz. 5.7.2 Outputs DC output voltages are summarized in Table 21. Voltage (V dc) + 5 +15 -15 Current (A dc) 50 Line Regulation For 10% change (%) < 0.2 < 0.5 < 0.5 Load Regulation For 10-100% change (%) < 0.5 < 10.0 < 10.0 PSU Output Voltages Table 2 Appendix 5 Page 33 of 33 Max Ripple < 0.5 < 2.0 < 2.0
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