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Theory of Operation

SDM-9000 Satellite Modem

5–10

Rev. 4

5.2.4.3 8PSK Encoding/Modulation

The modulator converts the transmit baseband data into a modulated 8PSK carrier by
trellis encoding at 2/3 or 5/6 rate. The 2/3 rate encoder generates 3 symbols for every
2 bits input, while the 5/6 rate encoder generates 6 symbols for every 5 bits input. Using
vector analysis of the constellation pattern generated by the modulator, 8 discrete phase
angles (0

°

, 45

°

, 90

°

, 135

°

, 180

°

, 225

°

, 270

°

, and 315

°

) represent 8 possible combinations

of 3 symbols generated by the encoder. The 2/3 and 5/6 rates encoded at the trellis
encoder provide the desired bit rates as follows:

Code Rate

Symbols/Bit

Bits/Hz

2/3

1.5

2

5/6

1.2

2.5

In 8PSK operation, the hardware to perform Reed-Solomon block encoding is required to
achieve better performance. Refer to Appendix A for details on Reed-Solomon
operation.

5.2.4.4 16QAM Encoding/Modulation

The modulator converts the transmit baseband data into a modulated 16QAM carrier at
3/4 or 7/8 rate. The modulator punctures the data by using the industry standard k = 7,
1/2 rate convolutional code and 3/4 and 7/8 punctured patterns. The 3/4 rate
convolutional encoder generates 4 symbols for every 3 bits input, while the 7/8 rate
convolutional encoder generates 8 symbols for every 7 bits input.

Using vector analysis of the constellation pattern generated by the modulator, 16 discrete
phase angle/amplitude states represent the 16 possible combinations of 4 symbols
generated by the encoder. The bit rates for 16QAM 3/4 and 7/8 rate convolutional
encoding are as follows:

Code Rate

Symbols/Bit

Bits/Hz

3/4

1.33

3

7/8

1.143

3.5

In 16QAM operation, the hardware to perform Reed-Solomon block encoding is required
to achieve the best operational characteristics and performance. Refer to Appendix A for
information on Reed-Solomon operation.

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Содержание SDM-9000

Страница 1: ...Part Number MN SDM9000 IOM Revision 4 SDM 9000 Satellite Modem Installation and Operation Manual...

Страница 2: ......

Страница 3: ...IDR With IDR 8PSK 8PSK 16QAM 16QAM 8PSK 8PSK 16QAM 16QAM BER 2 3 Rate 5 6 Rate 3 4 Rate 7 8 Rate 2 3 Rate 5 6 Rate Rate 7 8 Rate 10 6 6 1 dB 8 2 dB 8 3 dB 9 8 dB 6 5 dB 8 6 dB 8 7 dB 10 2 dB 10 7 6 4...

Страница 4: ...10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 2 3 RATE SPECIFICATIONS 5 6 RATE 8 Mbit s 8PSK w IDR 8 Mbit s 8PSK w IDR Figure 1 6 8PSK BER Performance Curves with Reed Solo...

Страница 5: ...8 Mbit s w IDR Figure 1 7 16QAM BER Performance Curves with Reed Solomon Filename T_ERRATA 3...

Страница 6: ...e Form C contact closures for alarm reporting as follows Alarm 1 Not used Alarm 2 TX Alarm 3 RX The two Form C summary fault contacts currently used are Transmit alarm Alarm 2 Receive alarm Alarm 3 Re...

Страница 7: ...e 3 2 This information will be incorporated into the next revision Change Specifics 3 2 Modulator The modulator PCB AS 3969 is located in the top slot of the modem chassis The jumper settings are list...

Страница 8: ......

Страница 9: ...in the USA Comtech EFData 2114 West 7th Street Tempe Arizona 85281 USA 480 333 2200 FAX 480 333 2161 SDM 9000 Satellite Modem Installation and Operation Manual Part Number MN SDM9000 IOM Revision 4 Ma...

Страница 10: ...port Department at service comtechefdata com Contact us via the web at www comtechefdata com 1 To return a Comtech EFData product in warranty and out of warranty for repair or replacement 2 Request a...

Страница 11: ...fications 1 12 1 4 1 Viterbi Decoder BER QPSK 1 12 1 4 2 Reed Solomon Codec BER QPSK 1 14 1 4 3 8PSK and 16QAM Viterbi Decoder and Reed Solomon Codec 1 16 CHAPTER 2 INSTALLATION 2 1 2 1 Unpacking 2 1...

Страница 12: ...Procedure 3 11 3 5 2 3 1 Nyquist Filter Removal 3 11 3 5 2 3 2 Nyquist Filter Replacement 3 13 3 6 Software Configuration 3 14 3 6 1 Revision Emulation 3 14 3 6 2 Remote Interface Specification 3 15 3...

Страница 13: ...4 3 2 1 TX Timing 4 54 4 3 2 2 RX Timing 4 54 4 3 2 2 1 RX Timing with Buffer 4 54 4 3 2 2 2 RX Timing without Buffer 4 54 CHAPTER 5 THEORY OF OPERATION 5 1 5 1 Display M C 5 1 5 1 1 Description 5 1...

Страница 14: ...Fault Isolation 6 13 6 2 1 Guidelines 6 13 6 2 2 System Faults Alarms 6 14 6 2 2 1 Fault Alarm Display and Description 6 18 6 2 2 2 Fault Alarm Analysis 6 19 6 2 2 2 1 Modulator Faults 6 19 6 2 2 2 2...

Страница 15: ...Mode SYNC Decoder A 18 A 2 6 SYNC 1 Inversion and Scrambler Descrambler A 19 A 2 6 1 DBS Mode De Scrambler for 204 Byte Packets A 20 A 2 7 Reed Solomon Coder Decoder A 21 A 2 7 1 DBS Mode Check Byte F...

Страница 16: ...ve Menu 4 20 Figure 4 7 Configuration Recall Menu 4 21 Figure 4 8 Monitor Menu 4 22 Figure 4 9 Faults Alarm Menu 4 24 Figure 4 10 Stored Faults Alarms Menu 4 32 Figure 4 11 Utility Modulator Menu 4 36...

Страница 17: ...r Sequence A 20 Figure A 17 Reed Solomon RS 204 188 8 Error Protected Packet A 21 Figure A 18 Interleaver De interleaver A 23 Figure A 19 Interleaved Frame Structure A 24 Figure A 20 DVB Puncturing A...

Страница 18: ...aphing to agree with Table 2 1 Deleted the notes following 2 4 8 1 2 4 8 1 1 2 4 8 2 and 2 4 8 3 Chapter 2 4 8 note references are to the notes listed in 2 4 8 Incorporated tool reference in 3 5 2 3 1...

Страница 19: ...ech EFData Specification SP 3965 INTELSAT Earth Station Standards IESS 308 309 Sonnet Specifications STS 1 International Telephone and Telegraph Consultative Committee CCITT V 35 European Broadcasting...

Страница 20: ...the EIA designations EIA 232 EIA 485 etc only Military Standards References to MIL STD 188 apply to the 114A series i e MIL STD 188 114A which provides electrical and functional characteristics of th...

Страница 21: ...Low Voltage Directive EN60950 HAR Type of power cord required for use in the European Community CAUTION Double pole Neutral Fusing ACHTUNG Zweipolige bzw Neutralleiter Sicherung International Symbols...

Страница 22: ...her warranty is expressed or implied Comtech EFData specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies provided herein...

Страница 23: ...pter 1 INTRODUCTION This chapter describes the options and provides an overview description and specifications for the SDM 9000 satellite modem referred to in this manual as the modem Figure 1 1 Figur...

Страница 24: ...ast DVB 70 140 MHz Duplex DC MIL188 144 with ESC RS H S 10 7 with DVB 70 140 MHz TX DC ECL with Buffer 70 140 MHz RX DC ECL with ESC ECL with Buffer RS PECL with Buffer PECL with ESC PECL with Buffer...

Страница 25: ...m features include a Nyquist filter Printed Circuit Board PCB for enabling the user to change data rates at the modulator or demodulator The modem supports up to four channels at the following data ra...

Страница 26: ...panel Backplane rear panel The backplane PCB is mounted on the chassis assembly and contains receptacles for three plug in PCBs Modulator Demodulator Interface Test points are located on the front edg...

Страница 27: ...SDM 9000 Satellite Modem Introduction Rev 4 1 5 Figure 1 3 SDM 9000 Block Diagram...

Страница 28: ...AS 4080 Reed Solomon Daughter Board DVB Standard AS 4524 Refer to Appendix A for more information 1 1 3 2 8PSK 16QAM The 8PSK modulation type is a PSK encoding method for providing a modulated carrier...

Страница 29: ...BS mode supports data rates up to 44 736 Mbit s using a single FEC channel Single channel implementation differs significantly from the International Telecommunications Satellite Organisation INTELSAT...

Страница 30: ...s DC PL 3978 Motherboard PL 2305 Display Monitor Control No FW included PL 4124 1 Filter Nyquist TX PL 4124 2 Filter Nyquist RX PL 4109 Supply Power AC Alternate PL 4110 Supply Power AC Preferred The...

Страница 31: ...ship of the interface card ECL with Reed Solomon Condition ECL P N Reed Solomon IDR STD P N Reed Solomon DVB STD P N Base 4477 11 Buffer 4477 21 ESC 4477 31 Buffer with Reed Solomon 4477 21 4080 4524...

Страница 32: ...Mbit s 51 840 Mbit s Elastic Buffer 2 to 32 ms selectable from front panel Digital Data Rate 6 0 to 51 84 Mbit s in 1 bit steps Scrambling Descrambling Types V 35 per CCITT V 35 IDR per IESS 308 EFD...

Страница 33: ...RS 485 Baud Rate 110 to 19200 bit s Functions Controlled Transmit Receive frequency Transmit power Transmitter on off Data rate modulation RF IF loopback Baseband Interface loopbacks Scrambler Descra...

Страница 34: ...t coding configurations are shown in Table 1 2 All values are for operation in QPSK mode Performance measurements are recorded with transmit and receive IF connected back to back through an additive w...

Страница 35: ...e Modem Introduction Rev 4 1 13 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 1 2 RATE 3 4 RATE SPECIFICATIONS 7 8 RATE Figure 1 4 Viterbi BER Perfor...

Страница 36: ...All values are for QPSK mode operation Refer to Figure 1 5 for the Reed Solomon BER curves Table 1 3 Reed Solomon BER Data Specification BER 1 2 Rate 3 4 Rate 7 8 Rate 10 6 4 1 dB 5 6 dB 6 7 dB 10 7...

Страница 37: ...odem Introduction Rev 4 1 15 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 3 4 RATE SPECIFICATIONS 1 2 RATE 7 8 RATE Figure 1 5 Reed Solomon BER Perf...

Страница 38: ...6QAM for the BER curves with the Reed Solomon option Table 1 4 8PSK and 16QAM BER Data Specification 8PSK 8PSK 16QAM 16QAM BER 2 3 Rate 5 6 Rate 3 4 Rate 7 8 Rate 10 6 6 1 dB 8 2 dB 8 3 dB 9 8 dB 10 7...

Страница 39: ...troduction Rev 4 1 17 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 2 3 RATE WITH R S 5 6 RATE WITH R S SPECIFICATIONS Figure 1 6 8PSK BER Performanc...

Страница 40: ...ite Modem 1 18 Rev 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 3 4 RATE WITH R S 7 8 RATE WITH R S SPECIFICATIONS 12 0 Figure 1 7 16QAM BER Performan...

Страница 41: ...SDM 9000 Satellite Modem Introduction Rev 4 1 19 A typical spectral occupancy curve is shown in Figure 1 8 Figure 1 8 SDM 9000 Typical Spectral Occupancy...

Страница 42: ...Introduction SDM 9000 Satellite Modem 1 20 Rev 4 This page is intentionally left blank...

Страница 43: ...t cards are packed in separate cardboard caddypacks also packaged within the cardboard carton CAUTION Do not use any cutting tool that will extend more than 1 into the container and cause damage to th...

Страница 44: ...the demodulator PCB AS 3970 should be removed Enter the System Utility menu on the front panel and select Operation mode Enter the menu and select TX only This will mask the RX faults and stored fault...

Страница 45: ...e main PCB assemblies Figure 1 2 as follows a Install the modulator PCB AS 3969 in the top slot b Install the interface PCB AS 3971 AS 4477 or AS 5618 in the middle slot c Install the demodulator PCB...

Страница 46: ...Installation SDM 9000 Satellite Modem 2 4 Rev 4 Note All dimensions are listed in inches Figure 2 1 SDM 9000 Dimensional Drawing...

Страница 47: ...SDM 9000 Rear Panel View Note In order to meet the European EMC Directive EN55022 EN50082 1 properly shielded cables for DATA I O are required These cables must be double shielded from end to end ensu...

Страница 48: ...ignal level should be between 25 and 45 dBm The signal frequency of the receive RX IF input is between 50 and 180 MHz 2 4 3 Receive Data CP3 The Receive Data connection is a BNC connector used for the...

Страница 49: ...S 232 C or RS 485 Refer to Appendix B for remote control operation information The remote interface connection is a 9 pin female D connector located on the rear panel of the modem Screw locks are prov...

Страница 50: ...fault connect all the Form C contacts in parallel The fault interface connection is a 9 pin female D connector located on the rear panel of the modem Screw locks are provided for mechanical security...

Страница 51: ...ATA I O pinout will be different for each of the interface configurations The interface pinouts are listed in the following sections Refer to the following Notes for additional data applying to each c...

Страница 52: ...30 ADPCM 2 audio input A2I A 47 A2I B 31 ADPCM 2 audio output A2O A 48 A2O B 32 Backward alarm 1 output BWO1 C 8 Note 1 BWO1 NC 25 BWO1 NO 41 Backward alarm 2 output BWO2 C 9 Note 1 BWO2 NC 26 BWO2 N...

Страница 53: ...46 30 64 kHz send timing out RS 422 E ST A 47 E ST B 31 64 kbit s receive data out RS 422 E RD A E RD B 48 32 Backward alarm 1 output BWO1 C 8 Note 1 BWO1 NC 25 BWO1 NO 41 Backward alarm 2 output BWO...

Страница 54: ...A 45 A1I B 29 ADPCM 1 audio output A1O A 46 A1O B 30 ADPCM 2 audio input A2I A 47 A2I B 31 ADPCM 2 audio output A2O A 48 A2O B 32 Backward alarm 1 output BWO1 C 8 Note 1 BWO1 NC 25 BWO1 NO 41 Backward...

Страница 55: ...B 29 ADPCM 1 audio output A1O A 46 A1O B 30 ADPCM 2 audio input A2I A 47 A2I B 31 ADPCM 2 audio output A2O A 48 A2O B 32 Backward alarm 1 output BWO1 C 8 Note 1 BWO1 NC 25 BWO1 NO 41 Backward alarm 2...

Страница 56: ...marily used in operating a protection switch The external high stability reference clock input is 5 10 or 20 MHz AGC OUT is the voltage for a receive signal level between 25 and 50 dBm The AUX 1 conne...

Страница 57: ...of alarms monitored To obtain a system summary alarm connect all the Form C contacts in parallel The alarms connection is a 9 pin female D connector located on the rear panel of the modem Screw locks...

Страница 58: ...ill automatically switch between ranges Maximum power consumption is less than 200W 2 4 12 DC Power The DC power is supplied to the modem by a standard detachable non locking 3 prong power cord IEC pl...

Страница 59: ...ws the Display M C card and the jumper locations The jumper settings are listed in Table 3 1 All modem functions can be remotely controlled and monitored via an RS 485 RS 232 C communications link The...

Страница 60: ...mote JP9 and JP10 32K 64K 128K 256K 256K 27C256 EEPROM at U17 27C512 EEPROM at U17 27C010 EEPROM at U17 27C020 EEPROM at U17 27C040 EEPROM at U17 Note Pins JP2 and JP3 must be in the 4 wire position f...

Страница 61: ...Table 3 2 Figure 3 2 shows the modulator card and the jumper locations Table 3 2 Modulator PCB Jumper Settings Jumper Position Function J7 1 to 2 2 to 3 Normal processor control Output forced ON test...

Страница 62: ...jumper settings are listed in Table 3 3 Figure 3 3 shows the demodulator card and the location of jumper JP5 Table 3 3 Demodulator PCB Jumper Settings Jumper Position Function JP5 EEPROM size select...

Страница 63: ...RX two 32 kbit s audio channels TX one 64 kbit s data channel while RX two 32 kbit s audio channels TX two 32 kbit s audio channels while RX one 64 kbit s data channel The jumper settings are listed i...

Страница 64: ...Configuration SDM 9000 Satellite Modem 3 6 Rev 4 JP1 Figure 3 4 Interface PCB AS 3971...

Страница 65: ...SDM 9000 Satellite Modem Configuration Rev 4 3 7 Figure 3 5 Interface PCB AS 4477...

Страница 66: ...Configuration SDM 9000 Satellite Modem 3 8 Rev 4 JP1 JP6 JP7 Figure 3 6 Interface PCB AS 5618...

Страница 67: ...tor PCB AS 3970 The filters include a factory programmable device that contains Data Rates Coding Rates Symbol Rates Options This information is programmed into the filter PCB at calibration time A la...

Страница 68: ...t s in 1 bit s steps 3 5 2 Installation Installation instructions for the field installed Nyquist filters AS 4124 include Unpacking initial inspection Tools required Installation procedure 3 5 2 1 Unp...

Страница 69: ...er has three 10 pin connectors for I O and power b Mount the card on the four standoffs with a 1 4 hex nut on each standoff to secure the PCB Tighten each nut using the 1 4 nut driver 2 Refer to Figur...

Страница 70: ...Configuration SDM 9000 Satellite Modem 3 12 Rev 4 Figure 3 7 Nyquist Filter Installation...

Страница 71: ...tall the TX RX filter card on the three 10 pin connectors Note The TX RX filter cards are keyed for easy installation TX Filter Connectors RX Filter Connectors Filter Modulator Filter Demodulator JP1...

Страница 72: ...1 4100 1 Original version 2 2 1 1 4100 1A Software changes 3 3 1 1 4100 1B Software changes 3 3 1 2 4100 1C Correctional Setting 4 4 1 1 4100 1D Software changes 5 5 1 1 4100 1E Software changes 6 6...

Страница 73: ...he parity bits can be set to EVEN ODD or NONE with 8 data bits The available baud rates bit s are listed below 110 150 300 600 1200 2400 4800 9600 19200 3 6 2 2 Remote Address To communicate with the...

Страница 74: ...r Clock Source RX Satellite Descrambler ON TX Clock Phase Normal Buffer Size 12 ms RX Clock Phase Normal Service Channel TX1 5 dBm Ext Ref Freq 5000 000 kHz Service Channel TX2 5 dBm B Band Loopback O...

Страница 75: ...nel The modem front panel Figure 4 1 enables the user to control modem configuration parameters and display the modem status Figure 4 1 SDM 9000 Front Panel View The major front panel features are 32...

Страница 76: ...xists in the TX chain RX Red A fault condition exists in the RX chain Common Red A common equipment fault condition exists Stored Yellow A fault has been logged and stored The fault may be active Stat...

Страница 77: ...s not available The modem front panel control uses a tree structured menu system Figures 4 2 through 4 16 to access and execute all functions The base level of this structure is the sign on message th...

Страница 78: ...TS ALARMS RX INTERFACE Figure 4 9 FAULTS ALARMS COMMON Figure 4 9 FAULTS ALARMS BACKWARD ALARMS Figure 4 9 FUNCTION SELECT STORED FAULTS ALARMS STORED FAULTS ALARMS MODULATOR Figure 4 10 STORED FAULTS...

Страница 79: ...r change is required press ENTER to begin the change process Press the arrow keys to change the parameters After the display represents the correct parameters execute the change by pressing ENTER This...

Страница 80: ...fixed user total range ON OFF NORMAL OFF CENTER OFFSET DUAL MODULATOR REF INTERNAL EXT 5 MHz EXT 10 MHz EXT 20 MHz Modulator high stability reference option only RS ENCODER ON OFF Reed Solomon option...

Страница 81: ...anged the TX is automatically turned off to prevent the possible swamping of other channels To turn the TX on use the IF Output function TX IF OUTPUT Programs the modulator output on or off On entry t...

Страница 82: ...sed to check the channel balance and carrier null On entry the Center mode is displayed To activate this test mode press ENTER Press or to select the Dual or Offset modes To return to the Configuratio...

Страница 83: ...SDM 9000 Satellite Modem Operation Rev 4 4 9 This page is intentionally left blank...

Страница 84: ...ONFIGURATION ON OFF TEST MODE CONFIGURATION 1 0 E 3 to 1 0 E 8 NONE SWEEP RANGE 0 to 120 000 Hz RS DECODER ON CORRECTION_OFF OFF Reed Solomon option only ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPEND...

Страница 85: ...for RF loopback operation When RF loopback is turned on the demodulator is programmed to the same frequency as the modulator When RF loopback is turned off the demodulator is tuned to the previous fre...

Страница 86: ...ursor Press ENTER to execute the change The smaller the range the faster the modem will lock provided the RX carrier center frequency is within the RX IF frequency sweep range RS DECODER Programs the...

Страница 87: ...SDM 9000 Satellite Modem Operation Rev 4 4 13 This page is intentionally left blank...

Страница 88: ...lable when buffer installed NORMAL INVERT ECL PECL or MIL STD 188 interface only B BAND LOOPBACK ON OFF INTERFC LOOPBACK ON OFF ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information...

Страница 89: ...cute the change BUFFER CLOCK Programs the interface buffer output clock to one of the following modes RX Satellite Internal Clock External Clock TX Terrestrial RX Satellite Mode Sets the buffer output...

Страница 90: ...eband signals are also looped back from the TX data and clock to RX data and clock on the customer side of the interface This is a bi directional loopback of the baseband data Refer to Figure 4 19 for...

Страница 91: ...crambler is displayed Press or to select ON or OFF Press ENTER to execute the change DESCRAMBLER Programs the descrambler on or off On entry the current status of the descrambler is displayed Press or...

Страница 92: ...displayed Press or to select ON or OFF Press ENTER to execute the change RX 2047 PATTERN Test Mode Configuration Option Programs the modem to RX a 2047 pattern as the normal RX data and allows the BE...

Страница 93: ...n Save This feature allows the user to program configuration parameters into memory on the M C There are five memory locations that may be used to store specific configuration setups that are used fre...

Страница 94: ...N DEPENDENT Parameter Information Key Figure 4 7 Configuration Recall Menu 4 2 1 5 Configuration Recall Once a configuration setup has been saved it may be recalled by entering Configuration Recall On...

Страница 95: ...NO DATA if carrier not locked CURRENT Eb N0 Low limit based on data rate High limit 16 0 dB NO DATA if carrier not locked CURRENT RECEIVE LEVEL 25 to 50 dBm CURRENT SWEEP FREQUENCY 60 000 to 60 000 H...

Страница 96: ...limit is 1 0 12 Eb N0 Displays the current Eb N0 or No Data if carrier is not locked Range mm m to mm m Note Low limit based on performance High limit is 16 0 dB RX SIGNAL Displays the current RX sign...

Страница 97: ...RATION See notes BUFFER UNDERFLOW BUFFER OVERFLOW RX DATA AIS FRAME BER BUFFER CLK PLL BUFFER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL PROGRAMMING CONFIGURATION See notes BATTERY CLOCK 12 VOLT SUPP...

Страница 98: ...onitored fault status is displayed as follows indicates that no fault or alarm exists indicates that a fault exists and will cause switching in a redundant system A reversed contrast indicates an alar...

Страница 99: ...y fault Q CHANNEL Q channel data activity fault AGC LEVEL TX IF AGC level fault INTERNAL SCT SYN Internal TX data clock synthesizer fault EXT REF ACT Modulator fault This is only used with the Externa...

Страница 100: ...loss of activity in the I channel of the quadrature demodulator Q CHANNEL Q channel activity fault Indicates a loss of activity in the Q channel of the quadrature demodulator DESCRAMBLER Descrambler...

Страница 101: ...er data input to the modem When None is selected in the Configuration Interface menu the TX Data AIS Fault Alarm is not activated Note AIS is an alarm not a switching fault TX CLOCK PLL TX phase locke...

Страница 102: ...Alarm is not activated Note AIS is an alarm not a switching fault FRAME BER Frame BER fault Indicates that the frame BER exceeds 1 3 BUFFER CLK PLL Buffer clock phase locked loop fault Indicates the b...

Страница 103: ...er on off cycle INTERFACE MODULE Interface module fault typically indicates that the interface module is missing or will not program 4 2 3 6 Backward Alarms BW Alarm RX 4 RX backward alarm 4 indicator...

Страница 104: ...SDM 9000 Satellite Modem Operation Rev 4 4 31 This page is intentionally left blank...

Страница 105: ...ION See notes HH MM SS MM DD YY FAULT LABEL BUFFER UNDERFLOW BUFFER OVERFLOW RX DATA AIS FRAME BER BUFFER CLK PLL BUFFER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL PROGRAMMING CONFIGURATION See notes...

Страница 106: ...n additional common equipment fault is logged Flt1 to indicate the power up time and date The power down and power up times are logged as common equipment fault 0 and common equipment fault 1 respecti...

Страница 107: ...Operation SDM 9000 Satellite Modem 4 34 Rev 4 This page is intentionally left blank...

Страница 108: ...date Firmware information Test mode status Overhead type Revision emulation Note Changes in the Utility menu may cause changes in other front panel menus A lamp test function is provided for testing...

Страница 109: ...re number MM DD YY Month Day Year TX FPGA FIRMWARE FW NNNNNN DDR FW NNNNNN DDR Firmware number MM DD YY Month Day Year ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key FILTE...

Страница 110: ...lator options 8PSK and 16QAM High Stability Note This menu is status only MOD POWER OFFSET Modulator power adjust offset Allows the operator to offset the modulator output power readout in the Configu...

Страница 111: ...ION DEPENDENT Parameter Information Key RXA QPSK 3 4 32368 000 kbit s RXB QPSK 3 4 RS 34368 000 kbit s Appended RS indicates Reed Solomon calibrated RXC QPSK 3 4 44736 000 kbit s RXD QPSK 3 4 51840 00...

Страница 112: ...signments are used for the selection of RX rate in the Configuration Functions menu 2 If the filter is optimized for Reed Solomon RS will be appended to the code rate 3 Refer to the table in Figure 4...

Страница 113: ...operation Type 1 Base Type 2 Doppler Buffer Type 3 Doppler Buffer and ESC STATUS ONLY BUFFER ESC RS EFD RS DVB ESC 64K ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key UTIL...

Страница 114: ...2064 Framing Structure NONE G 752 34368 Framing Structure NONE G 751 G 753 44736 Framing Structure NONE G 752 51840 Framing Structure NONE STS 1 IDR BACKWARD ALARM CONTROL BW Alarm RX x ON OFF BW Alar...

Страница 115: ...uffer Type 3 Doppler Buffer and ESC INTERFACE OPTION This menu is a status only window reporting the interface options The interface module options displayed are Buffer ESC RS EFD RS DVB ESC 64K TX IN...

Страница 116: ...of the descrambler is displayed Press or to select the type Press ENTER to execute the change FRAMING STRUCTURE Displays the currently selected framing type and structure of the data Framing Type Fram...

Страница 117: ...NTER to turn on all the front panel indicators for three seconds MASTER RESET HARD SOFT Initiating a hard reset will result in the modem being configured to the default settings in ROM Initiating a so...

Страница 118: ...or parity press ENTER Press or to position the flashing cursor over the parameter to be changed Press or to change the parameter to the desired value Once the parameters are displayed as desired pres...

Страница 119: ...ration CAUTION Initiating a hard reset will result in the modem being configured to the default settings in ROM Initiating a soft reset will reset the modem hardware but will save the current configur...

Страница 120: ...ecute the change Note For any RX signal level between 25 and 50 dBm the software will interpolate the required AGC voltage EXT AGC MIN PWR Sets the AGC voltage for an RX signal level of 50 dBm The vol...

Страница 121: ...ER 6 1 1 FUNCTION SELECT UTILITY UTILITY MODEM TYPE MODEM TYPE REV EMULATION CURRENT_VERSION or FUNCTIONAL X Where X 1 INTELSAT DBS N5500 COMPATIBLE ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT P...

Страница 122: ...On entry the CURRENT_VERSION is displayed Press or to select the functional versions Press ENTER to execute the change Notes 1 Programming a current version default allows all features and options if...

Страница 123: ...D FLTS ENABLE TX INT FLTS ENABLE RX INT FLTS ENABLE TX MODULE RESET RX MODULE RESET INT MODULE RESET ASSIGN TRANSMIT FILTERS ASSIGN RECEIVE FILTERS ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Pa...

Страница 124: ...SDM 9000 Satellite Modem Operation Rev 4 4 51 Figure 4 17 RF Loopback Figure 4 18 IF Loopback...

Страница 125: ...loops through the demodulator interface and the modulator DATA CLOCK LOOPBACK RELAYS Figure 4 19 Baseband Loopback Interface loopback provides loopback at the interface between the interface module an...

Страница 126: ...a plesiochronous Doppler buffer is used data received from the satellite network is clocked into the buffer using the RX satellite clock Data is clocked out of the buffer and to the terrestrial netwo...

Страница 127: ...ted and decoded from the satellite network 4 3 2 2 1 RX Timing with Buffer If a plesiochronous Doppler buffer is used data received from the satellite network is clocked into the buffer using the RX s...

Страница 128: ...SDM 9000 Satellite Modem Operation Rev 4 4 55 Figure 4 21 G 703 Interface Clocking Diagram Figure 4 22 ECL MIL STD 188 Interface Clocking Diagram...

Страница 129: ...other modules within the modem when necessary The modem configuration parameters are maintained in battery backed Random Access Memory RAM which provides total recovery after a power down situation Th...

Страница 130: ...k Diagram 5 1 2 Theory of Operation The M C card is composed of the following subsections Microcontroller Digital to Analog Converter DAC Read Only Memory ROM Analog to Digital Converter ADC RAM Inter...

Страница 131: ...ameters 2 If the nonvolatile memory fails the valid data test a default configuration from ROM is loaded into the system The UART supports serial ASYNC communications channels remote port with a maxim...

Страница 132: ...width efficiency over that of the standard QPSK Refer to Section 5 6 for a description of the modulation types Figure 3 2 shows the modulator PCB A block diagram of the modulator baseband section is s...

Страница 133: ...SDM 9000 Satellite Modem Theory of Operation Rev 4 5 5 Figure 5 3 Modulator RF Section Block Diagram...

Страница 134: ...10 or 20 MHz reference Phase Error 2 0 maximum Filtering Type Nyquist pre equalized Spectral Occupancy Spectral density is 30 dB at 0 75 symbol rate Spurious and Harmonics 55 dBc Output Power 20 to 5...

Страница 135: ...sion comes from the interface card The data is first differentially encoded QPSK operation and then convolutional encoding takes place For QPSK modulation processing is done in accordance with IESS 30...

Страница 136: ...treams QPSK 2 8PSK 3 16QAM 4 This data is fed into a look up table for a Digital to Analog D A converter to perform amplitude equalization of the rectangular pulses The amplitude equalized data is pas...

Страница 137: ...K or mQAM where m relates to the number of discrete modulation states The following table is a brief description of the modulation types QPSK 4 discrete phase angles represent the 4 possible combinati...

Страница 138: ...Appendix A for details on Reed Solomon operation 5 2 4 4 16QAM Encoding Modulation The modulator converts the transmit baseband data into a modulated 16QAM carrier at 3 4 or 7 8 rate The modulator pun...

Страница 139: ...ptional Refer to Section 5 6 for a description of the modulation types Figure 3 3 shows the demodulator PCB A block diagram of the demodulator is shown in Figure 5 4 and all demodulator jumper setting...

Страница 140: ...erial 3 x 3 Barrel Shifter x3 Parallel Differential Decoder Extended Eb N0 Monitor Digital Delay Line 3 Bit x 526 Deep TTL to ECL Clock Loop Costas Loop AOC AGC 1 2 DDS 1 2 DDS DAC DAC To RF Demod PLL...

Страница 141: ...e and puncture pattern ambiguity resolution Three parallel Viterbi decoders Three parallel differential decoders A DDS based digital clock recovery PLL A DDS based digital carrier recovery PLL Costas...

Страница 142: ...Loop filter DDS The DDS performs the function of a VCO in an analog implementation but can be easily programmed to the desired center frequency via the local M C The output of the DDS is sent to the R...

Страница 143: ...s The positions of the null symbols are dictated by the code rate in use Since additional symbols are inserted into the data stream the decoder clock PLL is also synchronized to the depuncture logic T...

Страница 144: ...oding algorithm to provide FEC on the received data stream for errors occurring in the transmission channel A block diagram of the Viterbi decoder is shown in Figure 5 5 5 4 2 Specifications BER See F...

Страница 145: ...received symbol pairs This is related to the probability that the received symbol pair was actually transmitted as one of the four possible symbol pairs The branch metrics are then processed by the A...

Страница 146: ...X G 703 3971 2 X X G 703 IDR 3971 3 X X X G 703 8 448 3971 4 X G 703 8 448 3971 5 X G 703 8 448 3971 6 X G 703 5618 1 X G 703 5618 2 X G 703 64K 5618 3 X X ECL 4477 11 X ECL 4477 21 X X ECL 4477 31 X...

Страница 147: ...Clock PLL TX Clock Activity TX Programming TX Configuration Buffer Underflow Overflow Buffer Full Buffer Clock PLL Buffer Clock Activity RX Data AIS Frame BER DEMUX Lock RX 2047 Lock RX Programming R...

Страница 148: ...quare wave Duty cycle 50 10 75 impedance 5 5 2 2 ECL ECL Data Rate 6 0 to 52 0 Mbit s in 1 bit s steps External Clock Range 1 544 to 20 0 MHz in 8 kHz steps or at the receive data rate External Clock...

Страница 149: ...data and clock TX overhead MUX ESC optional TX overhead receivers and processor RX overhead DEMUX ESC optional RX overhead processor and drivers Baseband loopback relays Interface loopback MUX Plesioc...

Страница 150: ...Theory of Operation SDM 9000 Satellite Modem 5 22 Rev 4 Figure 5 6 Interface Block Diagram...

Страница 151: ...2047 data is selected the transmit data is substituted with a pseudo random 2047 pattern using the internal clock if no data clock is available If ESC overhead is selected 96 kHz of additional data i...

Страница 152: ...nel of the modem During the pattern search no data available is reported An alarm on AIS or a data stable state can be selected as in the transmit path An optional plesiochronous buffer removes Dopple...

Страница 153: ...st be divisible by 8 kHz Additionally the external clock may be at the RX data clock rate Internal Clock Refer to TX Terrestrial This clock is at the same frequency as the TX terrestrial clock MIL STD...

Страница 154: ...back through the baseband loopback relays The far end equipment loops through the demodulator interface and modulator Refer to Figure 5 7 for a block diagram BASEBAND TX DATA CLOCK TERRESTRIAL RX DATA...

Страница 155: ...demodulator Refer to Figure 5 8 for a block diagram TX DATA CLOCK TERRESTRIAL RX DATA CLOCK TX DATA RX DATA MODULATOR DATA DEMODULATOR DATA MODULATOR MODULE DEMODULATOR MODULE INTERFACE MODULE TX IF...

Страница 156: ...signal also includes faults in the downlink chain since major problems with the antenna Low Noise Amplifier LNA down converter and other components will cause an interruption in service and fault the...

Страница 157: ...fer to IESS 308 for further clarification There are two methods for detecting a backward alarm that is being received on a particular link Each backward alarm output drives a Form C relay with all thr...

Страница 158: ...Theory of Operation SDM 9000 Satellite Modem 5 30 Rev 4 This page is intentionally left blank...

Страница 159: ...nd demodulator PCBs The instructions include tables and test points for ensuring that the Eb N0 typical output spectrums typical eye patterns and constellation pictures are correct If a test failure o...

Страница 160: ...in Figure 6 1 Refer to Chapter 2 for the following data connections a MIL STD 188 b G 703 c ECL d PECL 3 Set up the modem for baseband loopback operation by using the Configuration Interface front pan...

Страница 161: ...the modem spectrum top as shown Use this measurement for the first column on the appropriate table as listed above Read across the page to find the S N and Eb N0 for the specific code rate Once the de...

Страница 162: ...Maintenance SDM 9000 Satellite Modem 6 4 Rev 4 Figure 6 2 Typical Output Spectrum with Noise Figure 6 3 Typical Output Spectrum without Noise...

Страница 163: ...9 5 9 5 9 5 7 8 9 5 7 1 10 5 10 1 10 1 10 1 8 3 10 1 7 7 11 0 10 6 10 6 10 6 8 9 10 6 8 2 11 5 11 2 11 2 11 2 9 4 11 2 8 8 12 0 11 7 11 7 11 7 10 0 11 7 9 3 12 5 12 2 12 2 12 2 10 5 12 2 9 8 13 0 12...

Страница 164: ...9 9 0 8 4 5 4 8 4 4 4 9 5 9 0 6 0 9 0 5 0 10 0 9 5 6 5 9 5 5 6 10 5 10 1 7 1 10 1 6 1 11 0 10 6 7 6 10 6 6 7 11 5 11 2 8 2 11 2 7 2 12 0 11 7 8 7 11 7 7 7 12 5 12 2 9 2 12 2 8 3 13 0 12 8 9 8 12 8 8...

Страница 165: ...8 2 4 9 0 8 4 3 6 8 4 3 0 9 5 9 0 4 2 9 0 3 5 10 0 9 5 4 8 9 5 4 1 10 5 10 1 5 3 10 1 4 7 11 0 10 6 5 9 10 6 5 2 11 5 11 2 6 4 11 2 5 7 12 0 11 7 6 9 11 7 6 3 12 5 12 2 7 5 12 2 6 8 13 0 12 8 8 0 12...

Страница 166: ...operating and ensure power levels data rates code rates etc are compatible 2 Allow the modem to lock up When the green carrier detect LED is on and the DEMUX lock fault has been cleared where applica...

Страница 167: ...SDM 9000 Satellite Modem Maintenance Rev 4 6 9 WITH NOISE WITHOUT NOISE Figure 6 4 Typical Eye Constellations...

Страница 168: ...ncludes a signal description under normal operating conditions 6 1 4 1 Interface PCB Refer to Figure 6 5 for G 703 ECL and MIL STD 188 test point locations Test Points ECL MIL STD 188 AS 4477 G 703 AS...

Страница 169: ...intenance Rev 4 6 11 6 1 4 2 Modulator PCB Refer to Figure 6 6 for test point locations Test Points Signal Name TP4 SYMBOL CLK Symbol Clock TP5 BIT CLK Data Clock 3 TP8 GND Ground test point Figure 6...

Страница 170: ...nel monitor See Q EYE test point TP3 DGND Ground test point TP4 Q EYE Q channel monitor The I and Q test points are digital representations of the received filtered signal To view these test points us...

Страница 171: ...odem is designed to assist the operator in determining which PCB has failed The faulty PCB can be removed and returned to EFData for repair Install a satisfactory spare PCB and continue with the opera...

Страница 172: ...System faults are reported in the Faults Alarms menu and stored faults are reported in the Stored Flts Alms menu Chapter 4 Refer to the fault tree Table 6 4 and the list of possible problems in order...

Страница 173: ...X X X X AGC X X X X INTERNAL SCT SYN X X X X EXT REF ACT X X X MODULE X X X X PROGRAMMING X X X X CONFIGURATION X X X X DEMODULATOR FAULTS CARRIER DETECT X X X IF SYNTHESIZER X X X RX CLOCK SYN X X X...

Страница 174: ...ACTIVITY X X X PROGRAMMING X X X X CONFIGURATION X X X X RX INTERFACE FAULTS BUFFER UNDERFLOW X X BUFFER OVERFLOW X X RX DATA AIS X X X X FRAME BER X X X BUFFER CLK PLL X X X BUFFER CLK ACT X X DEMUX...

Страница 175: ...Y X X 12V POWER SUPPLY X X 5V SUPPLY X X 5V SUPPLY X X CONTROLLER X X X X INTERFACE MODULE X X X X BACKWARD ALARMS IDR ONLY BW ALARM RX 4 X X X BW ALARM RX 3 X X X BW ALARM RX 2 X X X BW ALARM RX 1 X...

Страница 176: ...posed to the programmed condition Carrier Detect Green Decoder is locked Test Mode Yellow Flashes when the modem is in a test configuration Alarms Name Color Description TX Yellow A TX function is in...

Страница 177: ...t and will turn off the modulator output Ensure the proper data rate has been set up and selected and the incoming data rate matches the modem selections I CHANNEL Activity fault for the I channel dig...

Страница 178: ...common fault displayed in the modem Any problem from the input data on the modulator end of the circuit to the output of the decoder can cause this alarm First ensure the demodulator has an RF input...

Страница 179: ...icate a problem in the M C card or in the interface between the demodulator card and the M C card Return the defective card for repair PROGRAMMING Demodulator programming fault Indicates the demodulat...

Страница 180: ...ked loop alarm Indicates the transmitter PLL is not locked to the reference of the interface transmit clock recovery oscillator Return the interface card for repair The interface will fall back to the...

Страница 181: ...for RX data fault in the Interface Configuration menu the RX data AIS is monitoring a fault condition of all 1s or 0s This is referred to as a data stable condition meaning the data is not transitioni...

Страница 182: ...e RX interface module has failed to program a current configuration parameter If this fault occurs contact EFData Customer Support for assistance CONFIGURATION Receive interface configuration fault In...

Страница 183: ...upply fault Use the same procedure as with 12V fault To verify the 12 VDC power supply voltage check TP4 on the display M C card A voltage of 3 81 VDC will be monitored when the 12 VDC is at the prope...

Страница 184: ...LARM RX1 Receive backward alarm 1 Refer to BW alarm RX 4 for details BW ALARM TX4 Transmit backward alarm 4 The modem is being instructed to send backward alarm 4 to the distant end of the link This i...

Страница 185: ...re by assembly revision and serial number Data rate dependent hardware is labeled with the associated symbol rate on a board label When replacing a plug in module care must be taken to ensure the prop...

Страница 186: ...Maintenance SDM 9000 Satellite Modem 6 28 Rev 4 This page is intentionally left blank...

Страница 187: ...e middle slot of the modem chassis The Reed Solomon Codec works in conjunction with the Viterbi decoder and includes additional framing interleaving and Codec processing to provide concatenated FEC an...

Страница 188: ...d in this section are the Reed Solomon encoder Section A 1 2 1 and the Reed Solomon decoder Section A 1 2 2 A 1 2 1 Reed Solomon Encoder A block diagram of the Reed Solomon encoder section is shown in...

Страница 189: ...number of bytes in a given block of data out of the Codec The letter k represents the number of data bytes in a given block The output data is passed to the output FIFO and then to the block interlea...

Страница 190: ...0 Satellite Modem A 4 Rev 4 RSCODE n k t 208 192 8 2t CHECK BYTES kBYTES OF DATA RSWORD n BYTES 1 RSWORD 1 RS PAGE RS FRAME RS SYNC PERIOD UNIQUE WORDS GO INTO THESE BYTES Figure A 3 Reed Solomon Code...

Страница 191: ...m The three channels of serial data and the clock signals come from the demultiplexer on the interface PCB and are sent to the Reed Solomon decoder section through connector JP3 The data is passed to...

Страница 192: ...of bytes in a given block of data out of the Codec The letter k represents the number of data bytes in a given block The terms k n and t will vary depending on the data rate being used The Codec then...

Страница 193: ...by ESD Use ESD precautionary procedures when touching removing or inserting PCBs 1 Remove Reed Solomon PCB and mounting hardware from the cardboard caddypack and anti static material 2 Check packing l...

Страница 194: ...omon PCB with the interface PCB female header connectors J2 J3 and J4 respectively Refer to Figure A 5 for the connector and mounting hardware locations 4 Align Reed Solomon PCB standoffs with the int...

Страница 195: ...SDM 9000 Satellite Modem Options Rev 4 A 9 JP3 JP2 R S DECODER PCB JP1 MOUNTING SPACERS AND HARDWARE 6 JP4 MOUNTING HOLES 6 JP3 JP2 R S DECODER PCB INTERFACE PCB Figure A 5 Reed Solomon Installation...

Страница 196: ...rambling Reed Solomon coding Code rate puncturing DBS operation with the SDM 9000 is based on the European Broadcasting Union EBU DVB specifications of DVB SB 5 94 5 and ETS 300 421 Both of these spec...

Страница 197: ...PROCESS Figure A 6 Block Diagram of SDM 9000 Configured for DBS DVB Operation A 2 1 Requirements This section covers the module types that are compatible with each option and the minimum software req...

Страница 198: ...the baseband physical interface are described in Section A 2 3 Timing requirements for the baseband physical interface are presented in Section A 2 4 A 2 2 1 ECL Physical Interface The ECL interface u...

Страница 199: ...N PECL_IN 5V 5 2 1 16 8 12 4 MC10H101 330 PECL_OUT PECL_OUT 330 5V Figure A 8 Typical Differential PECL Receiver and Driver Table A 1 Electrical Characteristics of ECL and PECL Interface Types Symbol...

Страница 200: ...al format that are composed of 188 byte MPEG 2 packets In addition 16 null bytes are included as place holders for Reed Solomon overhead Figure A 9 shows the packet arrangement 204 BYTES 1 632 BITS SY...

Страница 201: ...Figure A 10 Figure A 10 Timing for Transmit Baseband Interface Parameters for TX baseband interface timing are presented in Table A 2 Table A 2 TX Baseband Interface Timing Parameter Description Min t...

Страница 202: ...because the DBS sync detect logic writes a new sync byte pattern upon receiving the sync pulse After the sync byte interval 187 bytes 1 496 bits of packet data followed by 16 bytes 128 bits of zeros...

Страница 203: ...Mode Receive SYNC Pulse Timing In DBS mode a one clock period wide sync pulse is supplied coincident with the first bit of the sync byte 0x47 After the sync byte interval 187 bytes 1 496 bits of packe...

Страница 204: ...nterleaver If the external sync pulse is not supplied the condition is detected In this case a new framing structure is written over the 204 byte packets in no particular relationship to the original...

Страница 205: ...or The polynomial used for the PRBS is 1 X 14 X 15 The basic scrambler descrambler is shown in Figure A 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 INITIALIZATION SEQUENCE PRBS GENERATOR ENABLE FROM SYNC D...

Страница 206: ...onal 16 bytes of padding at the end of each transport packet The padding is reserved for Reed Solomon RS overhead To be compatible with the DVB specification the PRBS generator must be halted and the...

Страница 207: ...C BYTE SCRAMBLED PAYLOAD 187 BYTES 204 BYTES 1 632 BITS RS 204 188 8 16 BYTES Figure A 17 Reed Solomon RS 204 188 8 Error Protected Packet Note RS coding is also applied to the non inverted or inverte...

Страница 208: ...h the 16 Reed Solomon check bytes The DBS mode allows a 1 for 1 byte replacement in the RS coder therefore no rate exchange is required The 204 byte RS error protected packet is then sent to the depth...

Страница 209: ...verted sync bytes are always routed in branch 0 of the interleaver corresponding to a null delay The de interleaver is similar in principle to the interleaver but the branch indexes are reversed i e b...

Страница 210: ...ected packets Figure A 19 shows the interleaved frame structure SYNC 1 or SYNC n 203 BYTES 203 BYTES INTERLEAVING DEPTH I 12 SYNC 1 or SYNC n Figure A 19 Interleaved Frame Structure The interleaved fr...

Страница 211: ...at specified by IESS 308 INTELSAT and is shown in Figure A 20 G1 1 G1 2 G1 3 G2 1 G2 2 G2 3 G1 1 G2 1 G2 2 G1 3 RATE 1 2 CONVOLUTIONAL ENCODED DATA RATE 3 4 ENCODED PUNCTURED CHANNEL DATA G1 1 G1 2 G1...

Страница 212: ...symbol clock for each exchange rate Table A 4 Rate Exchange Ratios for DVB Puncturing Rate Ratio Comment 7 8 7 4 3 4 3 2 1 2 1 1 No symbols are punctured therefore no rate exchange is required The re...

Страница 213: ...ignal Space Mapping DBS DVB operation employs conventional Gray coded QPSK modulation with absolute mapping no differential coding Bit mapping in the signal space is shown in Figure A 21 Q I I 0 Q 0 I...

Страница 214: ...ion H f f f N 1 1 for H f f f f f f f N N N N N sin 1 2 1 2 2 1 1 for H f f f N 0 1 for where 35 f T R N S S 1 2 2 is the Nyquist frequency The reception process uses Nyquist filters exhibiting the sa...

Страница 215: ...le A 5 Reed Solomon BER Data Specification Typical BER 1 2 Rate 3 4 Rate 7 8 Rate BER 1 2 Rate 3 4 Rate 7 8 Rate 10 6 3 7 dB 4 7 dB 5 4 dB 10 6 3 1 dB 4 0 dB 5 0 dB 10 7 3 9 dB 4 9 dB 5 6 dB 10 7 3 2...

Страница 216: ...tellite Modem A 30 Rev 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 3 0 4 0 5 0 6 0 Eb N0 dB 7 0 8 0 9 0 10 0 11 0 10 2 1 2 Rate Specification 3 4 Rate 7 8 Rate Figure A 22 QPSK 1 2 3 4 7 8 Rates wi...

Страница 217: ...is valid on the rising edge Setup and hold times for the rising edge are 5 uS If byte alignment is required the 8 kHz clock can be used The first bit of data is valid with the first rising edge of th...

Страница 218: ...Options SDM 9000 Satellite Modem A 32 Rev 4 This page is intentionally left blank...

Страница 219: ...ion are transferred via an RS 485 optional RS 232 serial communications link Commands and data are transferred on the remote control communications link as US ASCII encoded character strings The remot...

Страница 220: ...ngle character precedes all messages transmitted on the remote link This character flags the start of a message This character is for commands for responses B 2 2 Device Address The device address is...

Страница 221: ...Error message for a recognized command which cannot be implemented or has parameters which are out of range add ER3_unrecognizable command cr lf Error message for unrecognizable command or bad comman...

Страница 222: ...Data rate in kHz Note If the filter is calibrated for the Reed Solomon RS will be appended to the code rate Example 3 4 RS_44736 0 Modulator Rate Preset Selection Command Response Status add SMRx_ cr...

Страница 223: ...xxx cr lf Where xxxx NRM normal spectrum or INV inverted spectrum B 3 2 Demodulator Demodulato r Frequency Command Response Status Response add DF_nnn nnnn cr add DF_nnn nnnn cr lf add DF_ cr add DF_n...

Страница 224: ...r Spectrum Rotation Command Response Status Response add DSR_xxxx cr add DSR_xxxx cr lf add DSR_ cr add DSR_xxxx cr lf Where xxxx NRM normal spectrum or INV inverted spectrum B 3 3 Interface Transmit...

Страница 225: ...ere xxx ON or OFF Interface Coding Format Transmit Command Response Status Response add ICFT_xxxx cr add ICFT_xxxx cr lf add ICFT_ cr add ICFT_xxxx cr lf Where xxxx AMI B3ZS or HDB3 Interface Coding F...

Страница 226: ...ceive Overhead Type Command Response Status Response add IROT_xxxx cr add IROT_xxxx cr lf add IROT_ cr add IROT_xxxx cr lf Where xxxx NONE or IDR Note If the ESC Option is not installed only NONE will...

Страница 227: ...here mm 1 to 12 month dd 1 to 31 day yy 00 to 99 year Remote Command Response add REM_ cr add REM_ cr lf The Remote command configures the modem for remote operation The modem will respond to any stat...

Страница 228: ...r lf RF Output ON OFF Modulator Frequency Modulator Rate Preset A Assignment Preset B Assignment Preset C Assignment Preset D Assignment Modulator Power Offset Modulator Output Power Differential Enco...

Страница 229: ...oder ON OFF Backward Alarm Enable TX1 Backward Alarm Enable TX2 Backward Alarm Enable TX3 Backward Alarm Enable TX4 Scrambler Type RF Output ON OFF This command is used by the EFData M N protection sw...

Страница 230: ...N OFF IF Loopback ON OFF External Reference Frequency Buffer Clock Receive Clock Phase Baseband Loopback Interface Loopback Interface Loop Timing Interface Coding Format Receive Interface Read Error R...

Страница 231: ...face Substitution Pattern TX 2047 Interface Read Error RX 2047 Transmit Data Fault Receive Data Fault Service Channel Level TX1 Service Channel Level TX2 Service Channel Level RX1 Service Channel Leve...

Страница 232: ...ule Carrier Detect IF Synthesizer Lock Receive Clock Synthesizer I Channel Q Channel Descrambler BER Threshold Programming Configuration Number of Stored Faults Logged 0 to 10 Interface Transmit Side...

Страница 233: ...2_xxx cr TXBWA3_xxx cr TXBWA4_xxx cr RXBWA1_xxx cr RXBWA2_xxx cr RXBWA3_xxx cr RXBWA4_xxx cr SFLT_xx cr lf TX Backward Alarm 1 TX Backward Alarm 2 TX Backward Alarm 3 TX Backward Alarm 4 RX Backward A...

Страница 234: ...2003 5207 1010 1012 cr lf Where t t Time corrected BER samples in seconds 0 1 to 9 9 At least one data point has been logged s1 to sn Corrected BER samples in the format of xmmee where x the optional...

Страница 235: ...the error rate cannot be calculated 3 Sampling is returned if not enough data is currently available to calculate the error rate Eb N0 Status Command Response add EBN0_ cr add EBN0_xnn ndB cr lf Where...

Страница 236: ...alue s or receive signal level sign plus or minus nn 0 to 99 receive signal level magnitude Notes 1 The x or parameter is only returned if the level has exceeded the computational resolution of the sy...

Страница 237: ...SCT_xxx cr EXT_xxx cr PROG_xxx cr CONF_xxx cr lf Module IF Synthesizer Data Clock Activity Data Clock Synthesizer I Channel Q Channel AGC Level Internal SCT Synthesizer External Reference Activity Pro...

Страница 238: ...e add CSF_ cr add CSF_ hh mm ss MM DD YY cr M C_xxx cr INT_xxx cr BAT_xxx cr 5_xxx cr 5_xxx cr 12_xxx cr 12_xxx cr lf M C Module Data Interface Module Battery Clock 5V Power Supply 5V Power Supply 12V...

Страница 239: ...meter returned Parameter Number Parameter Name Command Reference Description 1 2 3 4 5 6 Receive Signal Level ref RSL_ command Raw BER ref RBER_ command Corrected BER ref CBER_ command Interface Read...

Страница 240: ...eset B assignment ref ARMB_ command Modulator preset C assignment ref ARMC_ command Modulator preset D assignment ref ARMD_ command Modulator power offset ref MPO_ command Modulator output power level...

Страница 241: ...ref RCP_ command Baseband loopback ref BBL_ command Interface loopback ref ILB_ command Interface loop timing ref ILT_ command TX Interface coding format ref ICFT_ command RX Interface coding format r...

Страница 242: ...Remote Control Operation SDM 9000 Satellite Modem B 24 Rev 4 ref SE_ command...

Страница 243: ...phase ref TDP_ command Receive data phase ref RDP_ command Backward Alarm enable TX1 ref BW_TX1_ command Backward Alarm enable TX2 ref BW_TX2_ command Backward Alarm enable TX3 ref BW_TX3_ command Ba...

Страница 244: ...mmand Interface 44736 frame structure ref IRFS_ command Interface 51840 frame structure ref IRFS_ command Modem operation mode ref MOM_ command MODEM REMOTE LOCAL mode System modem type ref SMT_ comma...

Страница 245: ...Modulator fault status character 3 Bit 6 1 always Bit 5 Internal SCT Synthesizer Bit 4 Programming Bit 3 Configuration Bit 2 External Reference Activity Bit 1 reserved Bit 0 reserved Where Character d...

Страница 246: ...Bit 3 2047 Pattern Lock Detect Bit 2 Buffer Full Bit 1 Programming Bit 0 Configuration Where Character l Common equipment fault status character 1 Bit 6 1 always Bit 5 Monitor and Control Module Bit 4...

Страница 247: ...er 0 to 999999 dd Firmware dash number 0 to 99 r Firmware revision or A to Z Modulator Firmware Information Command Response add MFI_ cr add MFI_ cr VER_xxx yyy zzz cr FW nnnnnn ddr cr mm dd yy cr FPG...

Страница 248: ...ption installed Interface Options Misc Information Command Response add IOI_ cr add IOI_ cr dddddd cr y BUILD cr x BUFFER cr x ESC cr x RS_EFD cr x RS_DVB cr x 64K_ESC_ cr z TX_ESC_JUMPER cr z RX_ESC_...

Страница 249: ...Modulation AFC Automatic Frequency Control AGC Automatic Gain Control AIS Alarm Indication Signal AM Amplitude Modulation AMI Alternate Mark Inversion AOC Automatic Offset Control APM Amplitude Phase...

Страница 250: ...Compatible CSMA Carrier Sense Multiple Access CTS Clear to Send CU Channel Unit CW Continuous Wave D I Drop and Insert D A Digital to Analog D C Down Converter DAC Digital to Analog Converter DAMA Dem...

Страница 251: ...cy Shift Keying FIFO First in First Out Flt Fault FM Frequency Modulation FPGA Field Programmable Gate Array FS Frame Sync FSK Frequency Shift Keying FW Firmware GHz Gigahertz 109 hertz GND Ground HI...

Страница 252: ...on or Normally Closed NO Normally Open NRZ Non Return to Zero code ns Nanosecond 10 9 second OQPSK Offset Quadrature Phase Shift Keying OSC Oscillator p pico 10 12 P P Peak to Peak P AR Peak to Averag...

Страница 253: ...Amplifier ST Send Timing SW Switch SYNC Synchronize TB Terminal Block TCXO Temperature Compensated Crystal Oscillator TDMA Time Division Multiple Access TEMP Temperature TERR Terrestrial TP Test Poin...

Страница 254: ...Glossary SDM 9000 Satellite Modem g 6 Rev 4 This page is intentionally left blank...

Страница 255: ...103 1 609 x 103 1 609 1 mm 0 03937 1 kilometer 0 621 Temperature Conversions Units of Weight Unit Gram Ounce Avoirdupois Ounce Troy Pound Avoir Pound Troy Kilogram 1 gram 0 03527 0 03215 0 002205 0 0...

Страница 256: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...

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