DOCUMENT 820-13; REV. A DSN SYSTEM REQUIREMENTS DETAILED INTERFACE DESIGN RSC-11-10 DSN RADIO SCIENCE SYSTEM ORIGINAL DATA RECORD (ODR) AND DSCC SPECTRUM PROCESSING SUBSYSTEM (DSP) INTERFACE (Insert this module in Document 820-13; Rev. A) EFFECTIVE DATE: 1 March 1985 Initial Release Date: April 1, 1988 Approved by: E. R. Kursinksi (sig) (430) John J. Wiemewski (sig.) (368) Jay B. Curtoy II for G. W??? (sig) (440) A. PURPOSE This module defines and controls the format of the Radio Science Original Data Record (ODR). This record is generated by the Spectrum Processing Assembly (SPA) of the DSCC Spectrum Processing Subsystem (DSP), using the radio science software of the DSP, which is designated DSP-R. NOTE Implementation of the DSCC Spectrum Processing Subsystem will occur during more than one stage. This module describes the format of the ODR produced by DSP-R OP-A & -B used at the Voyager- Uranus encounter. B. REVISION AND CONTROL Revision or changes to the information herein presented may be initiated according to the procedures in Section 1 of this document. 1 820-13; Rev. A RSC-11-10 C. GENERAL INFORMATION The DSP is a computer controlled subsystem that digitally samples and records on tape a received spacecraft signal along with the monitor data nec- essary to reconstruct the signal. Analysis of variations in the amplitude, phase, and frequency of the signal provides information on the ring structure, atmospheric density, magnetic field, and charged particle environment of planets occulted by the spacecraft. The Radio Science ODR is delivered via mail to the Network Data Control (NDC) for delivery to the appropriate project Radio Science team, or it may be played back via wideband data lines (see module RSC-11-4) of the Ground Commun- ications Facility (GCF), where it can be processed in order to produce an Intermediate Data Record (IDR) (reference module IDR-12-1 of this document). D. DATA RECORDS AND CONTENT The DSP-R digitally samples the received spacecraft signal with 8-bit resolution and writes tape records with one of three lengths, depending on the sample rate. Table RSC-11-10-1 lists the record length for each sample rate. Each tape record is composed of (1) a header containing information on system configuration, time, receiver local oscillator values, etc., (2) a block of digital data from the four A-D converters, (3) data from the Precision Power Monitor, and (4) frequency and time offsets entered by the station operator. The DSP-R records data on a 9-track tape at 75 inches per second, with either (1) a tape density of 6250 bytes per inch (bpi) using the Group-Coded Recording (GCR) format with an 0.3-inch inter-record gap, or (2) a density of 1600 bpi using the Phase Encoding (PE) format with an 0.6-inch inter-record gap. American National Standards Institute (ANSI) formats are used. Only one tape density may be used per recording session. A special 16-word record is written at the beginning of each tape as part of the tape initialization process. The first 10 words of the record are ASCII characters identifying the program and version currently in use (e.g., DMD-5205-OP-A v 2.5). The remaining six words are nulls. 2 820-13; Rev. A RSC-11-10 Table RSC-11-10-1. Record Length Tabulation -------------------------------------------------------------------------------- Rate(1) | Samples (2) | Records | Data Words (3) | Total (4) | per Record | per | per | (Samples/second | (per A-D) | Second | Record |(Words/Record) per A-D Converter) | Converter) | | | -------------------------------------------------------------------------------- 8-bit Resolution -------------------------------------------------------------------------------- 50,000 (5) 1000 50 2000 2195 20,000 (5) 1000 20 2000 2195 (6) 10,000 (5) 1000 10 2000 2195 (6) 5,000 1000 5 2000 2195 2,000 1000 2 2000 2195 1 ,000 1000 2 2000 1195 200 1000 2 2000 395 ------------------------------------------------------------------------------- (1) Maximum effective sampling rate of four times individual converter rate is obtained when all four analog-to-digital (A-D) converters sample the same input channel sequentially, but separated by one-quarter cycle. (2) The total number of samples per record is four times that per individual A-D converter. (3) A word contains 16 bits; see NOTE following Word 43. (4) Includes 40-word header, N words of data, 150 words of PPM data, and 5 words of predict offset values (6) (see Figures RSC-11-9-1 through -4). (5) Only available when recording at 6250 bpi density. (6) In the OP-A version of the software, the five words of the operator-entered time and frequency offsets will not be recorded; thus, the number of words/ record will be 2190. 3 820-13; Rev. A RSC-11-10 E. DETAIL RECORD DESCRIPTION 1. Header* - 40 Words (See Figure RSC-11-10-1) WORD 1 BIT 1 Origin of Narrow Band Occultation Converter (NBOC) time tag (Words 7 and 8) and configuration information (Words 38 thru 40). 0 if time tag (Words 7 and 8) was generated by DSP-R software counting from last FTS l-second pulse or if configuration information (Words 38 thru 40) was generated by software and not read directly from NBOC buffer. 1 if time tag is from FTS and Words 38 thru 40 came directly from NBOC buffer. NOTES If bit 1 is set to "1" the following additional validity checks may be made: (a) Word 38 should be "A55A" (b) Word 40, bits 1 thru 8 should indicate correct configuration from the Conversion Mode Register. After bit 1 is set to "1" it will read "0" for the next L-l Records where L is the number of "Records Per Second" shown in column 3 of Table RSC-11-9-1. 2 Start of recording session flag: 0 if other than first record of recording session 1 if this is the first record of recording session 4 820-13; Rev. A RSC-11-10 BIT WORD |----------------------------------------------------------------------| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |----------------------------------------------------------------------| 1 | O | S | E | C |COMPRES FACTOR | TAPE NUMBER | 2 | RECORD NUMBER | 3 | LENGTH OF RECORD | 4 | PRIME FEA# | SECONDARY FEA# | 5 | SPACECRAFT NUMBER | SPC CODE | 6 | YEAR | DAY OF YEAR | 7 | UNUSED | MILLISECONDS PAST 0^h UTC | 8 | MILLISECOND OF DAY | 9 | ^ | ~ | PREDICT SET IDENTIFICATION ~ 13 | v | 14 | POCA STATUS |POCA FREQ (READBACK) | 15 | POCA FREQUENCY (READBACK) | 16 | POCA FREQUENCY (READBACK) | 17 | POCA FREQUENCY (READBACK) | 18 | UNUSED | TIME TAG OF POCA FREQ (READBACK) | 19 | TIME TAG OF POCA FREQUENCY (READBACK) | 20 | UNUSED |POCA FREQ (CALCULATED) | 21 | POCA FREQUENCY (CALCULATED) | 22 | POCA FREQUENCY (CALCULATED) | 23 | POCA FREQUENCY (CALCULATED) | 24 | FILTER | TIME TAG OF POCA (UPDATE CYCLE) | 25 | TIME TAG OF POCA (UPDATE CYCLE) | 26 | UNUSED | POCA FREQUENCY RATE | 27 | POCA FREQUENCY RATE | MULTIPLIER | S | 28 | FREQUENCY COUNTER NUMBER 1 CUMULATIVE PHASE | 29 | FREQUENCY COUNTER NUMBER 1 CUMULATIVE PHASE | 30 | FREQUENCY COUNTER NUMBER 1 CUMULATIVE PHASE | 31 | FREQUENCY COUNTER NUMBER 2 CUMULATIVE PHASE | 32 | FREQUENCY COUNTER NUMBER 2 CUMULATIVE PHASE | 33 | FREQUENCY COUNTER NUMBER 2 CUMULATIVE PHASE | 34 | TEST SIGNAL | SAMPLE CONTROL | COUNTER # 1 MODE | COUNTER #2 MODE | 35 | UNUSED | TIME TAG OF FMS COUNTER | 36 | TIME TAG OF FMS COUNTER | 37 | A/D CONVERTER SAMPLE RATE | 38 | A | 5 | 5 | A | 39 | '24' COUNTER | 'N' REGISTER | 40 | CONVERSION MODE REGISTER | SIGNAL SELECT REGISTER | |----------------------------------------------------------------------| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |----------------------------------------------------------------------| Figure RSC-11-10-1. Record Header 5 820-13; Rev. A RSC-11-10 NOTE Each time the program mode is changed from IDLE to RUN, this bit is set to 1 in the first record. WORD 1 (Contd) BIT 3 Error flag (can only occur during tape copy process): 0 if Master Tape contains no error 1 if error occurred while reading record on Master Tape 4 A-D Conversion: 0 indicates 8-bit resolution (No other resolution level is currently implemented.) 5 thru 8 0001 = Narrow Band, no compression (for com- patibility with Mk III ODR) 9 thru 16 Tape Number (binary) in this recording session; first tape is No. 1 NOTE A new recording session is indicated each time the program mode is changed from IDLE to RUN. Therefore, cycling between these two models will cause each tape to be labeled No. 1. The recording time listed on the tape label must be used to properly verify the tape sequence. WORD 2 BIT 1 thru 16 Record Number (Binary, reset to 1 at beginning of each tape) WORD 3 BIT 1 thru 16 Record Length (Binary unsigned integer), number of total words per record: See Table RSC-11-9-1, column 5. 6 820-13; Rev. A RSC-11-10 WORD 4 BIT 1 thru 8 Prime Front End Area (FEA) number (e.g., 14, 43) (Binary) 9 thru 16 Secondary FEA number (Recording of Secondary FEA number is not implemented in OP-A.) WORD 5 BIT 1 thru 8 Spacecraft Number (Binary) from predicts (See Document 820-13; module OPS-6-8) 9 thru 16 Signal Processing Center (SPC) designator (i.e., 10, 40, 60, or 21) (Binary) (See Document 820-13; module OPS-6-8) WORD 6 BIT 1 thru 7 Last two digits of year from predicts (Binary) 8 thru 16 Day of Year (Binary representation of decimal 1 through 366) WORD 7 BIT 1 thru 5 Unused 6 thru 16 Time of first sample in record, in milliseconds past 0 Universal Time Coordinated (UTC) (Binary representation in milliseconds of decimal 0 through 86,399,999). See Word 1, bit 1, for origin of time tag. WORD 8 BIT 1 thru 16 Time tag (Continued) 7 820-13; Rev. A RSC-11-10 WORDS 9 THRU 13 BIT 1 thru 16 Predict Set ID; Identification of predicts set used to tune the receiver frequency (ten 8-bit ASCII characters) WORD 14 POCA Status Status When Status When BIT Function Bit = 1 Bit = 0 1 Control Manual Computer* 2 Control Ready* Not Ready 3 Synthesizer Power On* Off 4 Synthesizer In-lock In-Lock* Out-of-Lock 5 Limit Enable On Off* 6 Track On* Off 7 Acquisition On Off* 8 Sweep On* Off 9 thru 16 Frequency value read back from the Programmed Oscillator Control Assembly (POCA) frequency registers - binary coded decimal (BCD) represen- tation in microhertz WORDS 15 THRU 17 BIT 1 thru 16 Value from POCA Frequency registers (Continued) WORD 18 BIT 1 thru 5 Unused 6 thru 16 Actual FTS time read from the POCA register, in milliseconds past 0 UTC. This is the time value that should be used for reconstructing POCA fre- quency values. ______________________ *Denotes Normal Radio Science Usage 8 820-13; Rev. A RSC-11-10 WORD 19 BIT 1 thru 16 Time tag (Continued) WORD 20 BIT 1 thru 8 Unused 9 thru 16 POCA frequency (calculated) - BCD representation in microhertz. Value of the predicted frequency (plus filter offset and operator-entered offsets) inter- polated by the DSP-R for the time recorded in Words 18 and 19. The predicted frequency is supplied by the NSS Radio Science prediction software (PREDIK). WORDS 21 TURU 23 BIT 1 thru 16 POCA frequency (calculated) - (Continued) WORD 24 BIT 1 thru 4 Multimission Receiver Filter number (i.e., 1 to 8) from the Operator-Controlled Input (OCI) - binary 5 Unused 6 thru 16 Time tag of POCA frequency update cycle in milli- seconds past 0^h UTC. This time value is for diag- nostic purposes only, and should not be used for data reconstruction. WORD 25 BIT 1 thru 16 Time tag of POCA frequency (update cycle) (Continued) WORD 26 BIT 1 thru 8 Unused 9 820-13; Rev. A RSC-11-10 WORD 26 (Contd) BIT 9 thru 16 POCA Frequency Rate from POCA rate registers - in Hertz per second (5 BCD digits following the decimal point i.e., .12345) WORD 27 BIT 1 thru 12 POCA Frequency Rate (Continued) 13 thru 15 Power of ten multiplier for POCA frequency rate (binary) 16 Sign for POCA Frequency Rate: WORDS 28 THRU 30 BIT 1 thru 16 One-second accumulated phase from frequency counter No. 1. Scaled to 2 cycles. Last 8 bits are fractional part of 1 cycle. (Bits 1 thru 16 will not be implemented in OP-A.) WORDS 31 THRU 33 BIT 1 thru 16 One-second accumulated phase from frequency counter No. 2. Scaled to 2 cycles. Last 8 bits are fractional part of 1 cycle. WORD 34 BIT 1 thru 4 Test Signal Selection: 0001 = Live input of Counter 1 (POCA) 0010 = Live input of Counter 2 1000 = 1 MHz 10 820-13; Rev. A RSC-11-10 WORD 34 (Contd) BIT 5 thru 8 Sample Control Register 1011 = Enable live sample; internal 10 MHz to resolvers and test facility 9 thru 12 Frequency Counter Number 1 Mode Register 0000 = Test frequency to counter 0001 = Live frequency to counter (POCA) 13 thru 16 Frequency Counter Number 2 Mode Register 0000 = Test frequency to counter 0001 = Live frequency to counter (not presently connected) WORD 35 BIT 1 thru 5 Unused 6 thru 16 Time tag of Frequency Monitoring Subassembly (FMS) counter readings (Words 28-33) in milliseconds past O^h UTC. This is the FTS time at which the program calculated the FMS phases described in Words 28 thru 33. (This time tag is for diagnostic purposes only, and will not be implemented in OP-A.) WORD 36 BIT 1 thru 16 Time tag of FMS counter (Continued) WORD 37 BIT 1 thru 16 Single A-D Converter Sample Rate (16-bit unsigned binary integer). WORD 38 First two bytes of the six bytes of sync data received from the NBOC at the beginning of each second 11 820-13; Rev. A RSC-11-10 WORD 38 (Contd) BIT 1 thru 4 HEX 'A' (Binary '1010') 5 thru 8 HEX '5' (Binary '0101') 9 thru 12 HEX '5' (Binary '0101') 13 thru 16 HEX 'A' (Binary '1010') WORD 39 BIT 1 thru 16 Reserved for diagnostic use. WORD 40 (Bytes 4 & 5 of NBOC Synch Data) BIT 1 thru 8 Conversion Mode Register Where: Bit 1: = 1 if an NBO converter overflow occurred = O if nominal Bits 2-3: Not used Bit 4: = 1 for 50-, 20-, 10-, 5- & 2-kilo samples/second rates = O for 1000- and 200 samples/second rates Bit 5: = 1 for test mode = O for normal operational mode Bit 6: = 1 for 8-bit resolution = No other resolution level is currently implemented. Bits 7-8: Mode: 00 = 4 input signals, each sampled by a separate converter 01 = 1 input signal sampled sequentially by 4 A-D converters 10 = 2 input signals, each sampled sequen- tially by 2 A-D converters 11 = 1 signal sampled by 1 A-D converter, and 1 signal sampled sequentially by 3 A-D converters 12 820-13; Rev. A RSC-11-10 WORD 40 (Bytes 4 & 5 of NBOC Synch Data) (Contd) BIT 9 thru 16 Signal Select Register Where: Bits: 9-10: A-D 1 00 = Input Signal Channel 1 11-12: A-D 2 where 01 = Input Signal Channel 2 13-14: A-D 3 10 = Input Signal Channel 3 15-16: A-D 4 11 = Input Signal Channel 4 (Example: If bits 9-16 = 10101010, then all 4 A-D converters will sample Input Signal Channel 3.) NOTE Five additional words containing operator-entered offsets to predict time and frequency are appended to record at the end of the Precision Power Monitor (PPM) data; however, this feature is not implemented in OP-A. (See paragraph E.4. of this module.) 2. Data portion of Tape Record (See Figure RSC-11-10-2) WORD 41 BIT 1 thru 8 A-D 1 data sample 9 thru 16 A-D 2 data sample WORD 42 BIT 1 thru 8 A-D 3 data sample 9 thru 16 A-D 4 data sample 13 820-13; Rev. A RSC-11-10 BIT |----------------------------------------------------------------------| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |----------------------------------------------------------------------| ~ ~ 41 | A-D 1 | A-D 2 | 42 | A-D 3 | A-D 4 | 43 | | | | ~ ~ | | N -1 | A-D 1 | A-D 2 | N -2 | A-D 3 | A-D 4 | |----------------------------------------------------------------------| Figure RSC-11-10-2. Format of the 8-bit Quantized Data From the Four A-D Converters WORDS 43 THRU N BIT 1 thru 16 Data Samples of A-D 1, A-D 2, A-D 3, and A-D 4 in the same sequence as that in Words 41 and 42 NOTE N s 240 for 200 samples/second per channel N = 1040 for 1000 samples/second per channel N = 2040 for >=2000 samples/second per channel 3. Precision Power Monitor Data (150 Words) The PPM data, the next 150 words of each record, are appended to the data portion. (See Figure RSC-11-10-3.) 14 820-13; Rev. A RSC-11-10 BIT |----------------------------------------------------------------------| WORD | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |----------------------------------------------------------------------| N*+1 | PPM SEGMENT RECEIVED STATUS | 2 | RECEIVER POLARIZATION AND ANTENNA Dl/LO INFO | 3 | UNUSED | 4 | UNUSED | 5 | UNUSED | 6 | SEGMENT 7 DATA (45 WORDS) | | ^ | | | CONFIGURATION SEGMENT (SEE DOCUMENT | ~ ~ 820-16; MODULE MON-5-103 FOR ~ | | DEFINITION OF SEGMENTS) | | V | 50 | SEGMENT 7 DATA (45 WORDS) | 51 | SEGMENT 5 DATA (13 WORDS) | | ^ | | | | ~ ~ STATUS SEGMENT ~ | | | | V | 63 | SEGMENT 5 DATA (13 WORDS) | 64 | SEGMENT 2 DATA (15 WORDS) | | ^ | | | | ~ ~ 64-M NOISE TEMPERATURE SEGMENT ~ | | | | V | 63 | SEGMENT 2 DATA (15 WORDS) | 64 | SEGMENT 6 DATA (15 WORDS) | | ^ | | | | ~ ~ 34-M STANDARD NOISE TEMPERATURE SEGMENT ~ | | | | V | 93 | SEGMENT 6 DATA (15 WORDS) | 94 | SEGMENT 10 DATA (15 WORDS) | | ^ | | | | ~ ~ 34-M HEA NOISE TEMPERATURE SEGMENT ~ | | | | V | 108 | SEGMENT 10 DATA (15 WORDS) | 109 | SEGMENT 4 DATA (20 WORDS) | | ^ | | | | ~ ~ SIGNAL LEVEL SEGMENT - SLE #1 ~ | | | | V | 128 | SEGMENT 4 DATA (20 WORDS) | 129 | SEGMENT 8 DATA (20 WORDS) | | ^ | | | | ~ ~ SIGNAL LEVEL SEGMENT - SLE #2 ~ | | | | V | 148 | SEGMENT 8 DATA (20 WORDS) | 149 | UNUSED | 150 | UNUSED | |----------------------------------------------------------------------| *N DETERMlNED BY SAMPLE RATE. SEE SECTION E.2. Figure RSC-11-10-3. Format of PPM Data in 150 Words That Follow Data Portion of Record 15 820-13; Rev. A RSC-11-10 a. PPM Segment Received Status (See Figure RSC-11-10-3). WORD 1 BIT 1 Segment 7 1 = New data O = Old data 2 Segment 5 1 = New data O = Old data 3 Segment 2 1 = New data O = Old data 4 Segment 6 1 = New data O = Old data 5 Segment 10 1 = New data O = Old data 6 Segment 4 1 = New data O = Old data 7 Segment 8 1 = New data O = Old data 8 thru 16 Unused b. Receiver Polarization and Antenna DI/LO Information.* WORD 2 BIT 1 and 2 Rcvr 1 Polarization; from POL/DI OCI O = LCP 1 = RCP 2 = Linear 3 Rcvr 1 Diplex/Listen Only, from POL/DI OCI O = Diplex 1 = Listen Only ------------------------- *Reserved for future implementation. 16 ^L 820-13; Rev. A RSC-11-10 WORD 2 (Contd) BIT 4 and 5 Rcvr 2 Polarization; from POL/DI OCI O = LCP 1 = RCP 2 = Linear 6 Rcvr 2 Diplex/Listen Only, from POL/DI OCI O = Diplex 1 = Listen Only 7 and 8 Rcvr 3 Polarization; from OCI O = LCP 1 = RCP 2 = Linear 9 Rcvr 3 Diplex/Listen Only, from OCI O = Diplex 1 = Listen Only 10 and 11 Rcvr 4 Polarization; from OCI O = LCP 1 = RCP 2 = Linear 12 Rcvr 4 Diplex/Listen Only, from OCI O = Diplex 1 = Listen Only 13 and 14 Rcvr 5 Polarization; from OCI O = LCP 1 = RCP 2 = Linear 15 Rcvr 5 Diplex/Listen Only, from OCI O = LCP 1 = Listen Only 16 Validity of previous 15 bits O = Invalid 1 = Valid NOTE Bits 1-16 of Word 2 will not be implemented in OP-A. WORDS 3 THRU 5 BIT 1 thru 16 Unused WORDS 6 TURU 50 BIT 1 thru 16 Segment 7 data (45 words) as defined in Document 820-16, module MON-5-103 (configuration segment) 17 820-13; Rev. A RSC-11-10 WORDS 51 THRU 63 BIT 1 thru 16 Segment 5 data (13 words) as defined in Document 820-16, module MON-5-103 (status segment) WORDS 64 THRU 78 BIT 1 thru 16 Segment 2 data (15 words) as defined in Document 820-16, module MON-5-103 (noise temperature segment, 64-m) WORDS 79 THRU 93 BIT 1 thru 16 Segment 6 data (15 words) as defined in Document 820-16, module MON-5-103 (noise temperature segment, 34-m Std.) WORDS 94 THRU 108 BIT 1 thru 16 Segment 10 data (15 words) as defined in Document 820-16, module MON-5-103 (noise temperature segment, 34-m HEF) WORDS 109 THRU 128 BIT 1 thru 16 Segment 4 data (20 words) as defined in Document 820-16, module MON-5-103 (signal level segment, SLE #l) WORDS 129 THRU 148 BIT 1 thru 16 Segment 8 data (20 words) as defined in Document 820-16, module MON-5-103 (signal level segment, SLE #2) 18 820-13; Rev. A RSC-11-10 WORDS 149 THRU 150 BIT 1 thru 16 Unused 4. Operator-Entered Offsets (5 Words) This information is appended following the PPM data. (See Figure RSC-11-10-4.) NOTE The following five words are not written in the tape records generated by OP-A of the DSP-R software. WORD N*+151 and N+152 BIT 1 thru 9 Predict Time Offset (days), (Binary) 10 thru 14 Unused 15 Sign of Predict Time Offset 1 = Negative 0 = Positive 16 thru Predict Time Offset in seconds Word N+152, (17-bit integer); bit 16 MSB is Word N+151, bit 16; LSB is Word N+152, bit 16. WORD N+153 thru N+155 BIT 1 thru 16 The S-band frequency offset to the predict set; formatted as a 48-bit binary number with LSB (Word N+155, bit 16) equal to 2^-20 Hz. Value may be positive or negative (2's complement format). Maximum value is 1.5 MHz. ------------------------ *Determined by sample rate (see Section E.2). 19 ^L 820-13; Rev. A RSC-11-10 BIT |----------------------------------------------------------------------| WORD | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |----------------------------------------------------------------------| ~ ~ N*+151 | PREDICT TIME OFFSET (DAYS) | UNUSED |SGN |MSB | N*+152 | TIME OFFSET (SECONDS) |LSB | N*+153 |MSB| PREDICT FREQUENCY OFFSET | N*+154 | PREDICT FREQUENCY OFFSET | N*+155 | PREDICT FREQUENCY OFFSET |LSB | |----------------------------------------------------------------------| *N DETERMINED BY SAMPLE RATE (SEE SECTION E.2.) Figure RSC-11-10-4. Operator-Entered Offsets to Predict Time and Frequency (Not implemented in OP-A.) 20