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4–1

Chapter 4. THEORY OF

OPERATION

This chapter contains the theory of operation information for the Monitor and Control
(M&C) section, modulator, demodulator, decoder, overhead interface, backward alarm
information.

4.1

Monitor and Control (M&C)

The M&C monitors the modem and provides configuration updates to other modems
within the modem when necessary.

The modem configuration parameters are maintained in battery-backed RAM, which
provides total recovery after power-down situation.

The M&C functions include extensive fault and status reporting.

All modem functions are accessible through a local front panel interface and a remote
communications interface.

A block diagram of the M&C is shown in Figure 4-1.

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Содержание SLM-3650

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...Number MN SLM3650 IOM Revision 3 SLM 3650 Satellite Modem 2 4 kbps to 5 0 Mbps Installation and Operation Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Страница 3: ...Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 4: ...85281 USA 480 333 2200 FAX 480 333 2161 SLM 3650 Satellite Modem 2 4 kbps to 5 0 Mbps Installation and Operation Manual Part Number MN SLM3650 IOM Field Revision 3 October 19 2004 Comtech EF Data is a...

Страница 5: ...tact us via the web at www comtechefdata com To return a Comtech EF Data product in warranty and out of warranty for repair or replacement 1 Request a Return Material Authorization RMA number from the...

Страница 6: ...fications 1 16 1 5 1 Viterbi Decoder BER 1 16 1 5 2 INTELSAT Viterbi with Reed Solomon Codec BER 1 18 1 5 3 Viterbi Sequential Closed Network Connection BER with Reed Solomon 1 20 1 5 4 Sequential Dec...

Страница 7: ...omon 2 29 2 5 2 Install Duplex Reed Solomon Board and Firmware 2 30 2 5 3 Duplex Reed Solomon Set up 2 31 CHAPTER 3 OPERATION 3 1 3 1 Front Panel 3 1 3 2 Revision Emulation Operation 3 4 3 3 Data Rate...

Страница 8: ...em Defaults 4 5 4 2 Modulator 4 7 4 2 1 Modulator Specifications 4 8 4 2 2 Theory of Operation 4 11 4 2 3 Theory of Modulation Types 4 12 4 3 Demodulator 4 14 4 3 1 Demodulator Specifications 4 15 4 3...

Страница 9: ...odem Revision 3 Preface MN SLM3650 IOM vi APPENDIX A OPTIONS A 1 APPENDIX B REMOTE CONTROL OPERATION B 1 GLOSSARY g 1 INDEX i 1 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURC...

Страница 10: ...re 2 9 Card Removal 2 27 Figure 2 10 Turbo Codec Card Installation 2 28 Figure 3 1 Front Panel View 3 1 Figure 3 2 Keypad 3 3 Figure 3 3 Main Menu 3 7 Figure 3 4 Configuration Modulator Menu 3 8 Figur...

Страница 11: ...Diagram A 57 Figure A 13 Receive Section of the Asymmetrical Loop Timing Block Diagram A 58 Figure A 14 Reed Solomon PCB A 61 Figure A 15 Reed Solomon Codec Block Diagram A 62 Figure A 16 Reed Solomo...

Страница 12: ...e 2 10 AUX 1 Connector and Pinouts J9 2 18 Table 2 11 Alarms Connector and Pinouts J10 2 19 Table 3 1 LED Indicators 3 2 Table 3 2 SLM 3650 Revision Emulation 3 4 Table 3 3 Modem Types 3 78 Table 3 4...

Страница 13: ...tion A 50 Table A 16 IDR Modem Defaults A 51 Table A 17 IBS Specification A 54 Table A 18 IBS Modem Defaults A 55 Table A 19 G 703 Specifications A 60 Table A 20 Specifications A 62 Table A 21 Reed So...

Страница 14: ...anual Comtech EF Data UB 300 Universal Breakout Panel Installation and Operation Manual Comtech EF Data UB 54 Universal Breakout Panel Installation and Operation Manual Comtech EF Data SDR 54A Satelli...

Страница 15: ...us injury IMPORTANT IMPORTANT indicates a statement that is associated with the task being performed Metric Conversion Metric conversion information is located on the inside back cover of this manual...

Страница 16: ...he European Electro Magnetic Compatibility EMC Directive EN55022 EN50082 1 properly shielded cables for DATA I O are required More specifically these cables must be shielded from end to end ensuring a...

Страница 17: ...F Data specifically disclaims the implied warranties of merchantability and fitness for particular purpose Exclusive Remedies The remedies provided herein are the buyer s sole and exclusive remedies C...

Страница 18: ...is a high performance full duplex digital vector modulator demodulator that meets the open network requirements of the INTELSAT Earth Station Standards IESS 308 309 310 and 315 Turbo only emulation sp...

Страница 19: ...features Fully Accessible System Topology FAST refer to Appendix A Differential Encoder Decoder Built in Scramblers Descramblers TX and RX Frequency Synthesizers Multi rate FEC convolutional Viterbi...

Страница 20: ...terface card is used for control between two links to sustain sufficient transmit power to maintain a programmed Eb N0 at both ends The second method is used for self monitoring the carrier from the s...

Страница 21: ...d TPC Forward Error Correction 1 2 21 44 5 16 3 4 7 8 1 1 or 2 3 Symbol rate of 4 8 ks s to 2 5 Ms s Note The modem can be configured to add overhead framing to the data Available modulation types inc...

Страница 22: ...e 1 2 and consists of from two to five Printed Circuit Boards PCBs depending on the configuration The modem consists of two major replaceable assemblies as follows Rear panel main PCB and power supply...

Страница 23: ...ESS 310 Requires Viterbi and Reed Solomon Codec 8 PSK 2 3 rate EFD Mode Requires Viterbi Codec Turbo Codec Requires Turbo Codec Asynchronous Overhead Includes automatic uplink power control AUPC IBS a...

Страница 24: ...AST OPTIONS SEQUENTIAL or VITERBI DECODER see Note 1 FAST OPTIONS LOW VARIABLE DATA RATE up to 512 kbps HIGH VARIABLE DATA RATE up to 4 375 Mbps SEQUENTIAL or VITERBI DECODER ASYMMETRICAL LOOP TIMING...

Страница 25: ...r only one can be used at a time 1 2 2 Factory Installed Options Consult a Comtech EF Data Customer Support representative for modem options The following options are installed at the factory Output I...

Страница 26: ...gure 1 3 for a system block diagram M C AUX CIRCUITS SAT CLK FAULT RELAYS ALARM RELAYS 5 TO 20 DBM OPTION SATELLITE MODEM BOP UB 530 CUSTOMER DATA I O AUX 1 TTL FAULTS FAULT FORM C CONTACTS ALARMS FOR...

Страница 27: ...ation and Operation Manual 1 2 4 2 UB 530 Breakout Panel Alternate part for UB 300 The UB 530 functions the same as UB 300 except the UB 530 has an EIA 530 25 pin Data I O connector at J3 For more inf...

Страница 28: ...em Assy 50 TNC H S 10 7 5 dB Power Out with Antenna PL 6284 TX Reed Solomon Assy PCB PL 6285 RX Reed Solomon Assy PCB Without Antenna PL 6285 1 RX Reed Solomon Assy PCB With Antenna PL 6451 Flex MUX P...

Страница 29: ...ld selectable Elastic Buffer 32 to 262144 bits selectable from front panel in bits or ms Digital Data Rate 2 4 kbps to 5 0 Mbps in 1 bit s steps front panel selection Scrambling Descrambling Types IES...

Страница 30: ...including container Size Weight 9 H x 21 W x 20 D 23 H x 53 W x 51 D cm 17 lbs 8 kg approximate Environmental Temperature Humidity 0 to 50 C 32 to 122 F 0 to 95 non condensing Additional Modulator Spe...

Страница 31: ...rential Encoding and Decoding Code and Decode Rate Transmit and Receive Overhead Type Acquisition Sweep Parameters Buffer Size IDR Backward Alarm Control On Off Reed Solomon On Off Mod and Demod Spect...

Страница 32: ...1 to 10 6 Performance measurements were recorded with transmit and receive IF connected back to back through an additive white Gaussian noise channel Refer to Figure 1 4 for the Viterbi BER curves Ta...

Страница 33: ...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 IBS 1 2 Rate IDR 3 4 Rate IDR 7 8 Rate SPECIFICATIONS Figure 1 4 Viterbi BER Performance Curves Artisan Technol...

Страница 34: ...rations Refer to Figure 1 5 for the INTELSAT Viterbi with Reed Solomon BER curves Table 1 6 INTELSAT Viterbi with Reed Solomon BER Data Specification Typical IBS IDR IBS IDR BER 1 2 Rate 3 4 Rate BER...

Страница 35: ...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 IBS 1 2 Rate IDR 3 4 Rate SPECIFICATIONS Figure 1 5 INTELSAT Viterbi with Reed Solomon BER Performance Curves Artisan...

Страница 36: ...0 required to achieve 10 6 to 10 10 BER for different configurations Refer to Figure 1 6 Viterbi Sequential Closed Network Connection with Reed Solomon BER Performance Curves Table 1 7 Viterbi Sequent...

Страница 37: ...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 SPECIFICATIONS 3 4 RATE 7 8 RATE Figure 1 6 Viterbi Sequential Closed Network Connection with Reed Solomon BER Performance...

Страница 38: ...uential BER curves Table 1 8 Sequential BER Data 56 kbps Specification Typical BER 1 2 Rate 3 4 Rate 7 8 Rate 1 2 Rate 3 4 Rate 7 8 Rate 10 3 4 6 dB 5 5 dB 4 1 dB 5 0 dB 10 4 4 1 dB 5 1 dB 6 1 dB 3 6...

Страница 39: ...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 7 8 Rate SPECIFICATIONS Figure 1 7 Sequential BER Specification Curves 56 kbps Artisan Techno...

Страница 40: ...R curves Table 1 9 Sequential Decoder BER Data 1544 kbps Specification Typical BER 1 2 Rate 3 4 Rate 7 8 Rate 1 2 Rate 3 4 Rate 7 8 Rate 10 3 4 8 dB 5 2 dB 6 0 dB 4 3 dB 4 7 dB 5 5 dB 10 4 5 2 dB 5 7...

Страница 41: ...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 7 8 Rate SPECIFICATIONS Figure 1 8 Sequential Decoder BER Specification Curves 1544 kbps Artisan T...

Страница 42: ...on All values are for operating in 8 PSK mode Refer to Figure 1 9 for the 8 PSK curves Table 1 10 8 PSK Specification 2 3 8 PSK with R S 2 3 8 PSK without R S BER Spec Typical Spec Typical 10 4 6 1 5...

Страница 43: ...OM 1 26 10 10 10 10 10 10 10 5 0 BER 6 0 7 0 8 0 9 0 10 0 11 0 E N db b 0 WITH REED SOLOMON WITHOUT REED SOLOMON 2 3 4 5 6 7 8 Figure 1 9 8 PSK BER Specification Curves Artisan Technology Group Qualit...

Страница 44: ...1 44 Rate 5 16 Rate 3 4 Rate 10 6 3 0 3 9 2 8 see Note 7 0 10 7 3 2 4 1 3 1 see Note 7 3 10 8 3 5 4 3 3 3 see Note 7 6 10 9 3 8 4 8 3 7 4 0 8 0 Note 5 16 BPSK is included for compatibility with other...

Страница 45: ...0 Turbo Product Codec 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 1 0 2 0 3 0 4 0 Eb N0 dB 5 0 6 0 7 0 8 0 9 0 10 2 BPSK 21 44 Rate QPSK OQPSK 3 4 Rate 8PSK 3 4 Rate QPSK OQPSK 1 2 Rate Artisan Techn...

Страница 46: ...ting in uncoded mode Refer to Figure 1 11 for uncoded values Table 1 12 Uncoded Values Uncoded BER 1 1 Rate 10 3 8 0 10 4 9 6 10 5 10 8 10 6 11 6 10 7 12 4 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10...

Страница 47: ...ion MN SLM3650 IOM 1 30 Figure 1 12 shows a typical spectral occupancy curve using the Comtech EF Data filter mask Figure 1 12 Typical Spectral Occupancy Artisan Technology Group Quality Instrumentati...

Страница 48: ...Note Dimensions are listed in inches and centimeters are noted in parentheses Refer to Figure 1 13 1 75 4 4 19 0 4 8 1 25 3 2 14 0 36 3 0 8 3 625 9 2 3 625 9 2 Figure 1 13 SLM 3650 Dimensional Drawin...

Страница 49: ...tion CAUTION Do not use any cutting tool that will extend more than 1 inch into the container This can cause damage to the modem Unpack the modem as follows 1 Cut the tape at the top of the carton ind...

Страница 50: ...k and slide the screw with flat washer through the slot of the mounting bracket Tighten the screw sufficiently to allow the modem chassis to slide in the bracket 3 Connect the cables to the proper loc...

Страница 51: ...3650 Satellite Modem Revision 3 Installation MN SLM3650 IOM 2 3 Figure 2 1 Installation of the Mounting Bracket Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Страница 52: ...n REMOTE J6 9 pin D Remote Interface FAULT J7 9 pin D FORM C Fault Relay Contacts DATA I O J8 25 pin D 34 pin 37 pin D 50 pin D 50 pin D 100 pin D 15 pin D BNC Data Input Output standard modem V 35 EI...

Страница 53: ...Option 50 Pin D Connector J6 REMOTE ALARMS J10 FAULT J7 J9 AUX 1 EX REF RX IF INPUT CP3 CP1 CP2 TX IF OUTPUT Figure 2 4 V 35 34 Pin Winchester Connector J6 REMOTE ALARMS J10 FAULT J7 J9 AUX 1 EX REF R...

Страница 54: ...ia cable to the remote connector This is a DCE interface that is user selectable for either EIA 485 or EIA 232 Refer to Appendix B for a description of the remote interface Refer to Table 2 2 for pino...

Страница 55: ...nector Refer to Table 2 3 for pinout information Table 2 3 Fault Connector and Pinouts J7 Pin Signal Function Name 1 Common equipment is not faulted NO 2 COM 3 Common equipment is faulted NC 4 Modulat...

Страница 56: ...witches 37 pin D is an alternate connector available upon special request for the base platform modem 34 pin Winchester is an alternate connector available upon special request for the base platform m...

Страница 57: ...SCT A 16 RD B RD B 17 RT A RXC SCR A 18 LL LL LL 19 EIA B 20 MC A MC MC A 21 DF DF DF 22 DM B 23 MC B MC B 24 TT A TXC SCTE A 25 MF MF MF Note Use the MASTER clock for EXTERNAL clock input This clock...

Страница 58: ...TCLK Out EIA 232 26 BWO2_NC ESC RCLK Out EIA 232 27 BWO3_NC PRIMARY_NC PRIMARY_NC 28 BWO4_NC SECONDARY_NC SECONDARY_NC 29 Aud1 B In or 64SDB V 35 EIA 422 RTS B V 35 EIA 422 RTS B 30 Aud1 B Out or 64RT...

Страница 59: ...m d Relay contacts DF C and DF NO are named for faulted condition DF C connected to DF NO unless demodulator Demod fault 2 D I ASYNC interface connector pinouts a With regard to alarm relay contacts C...

Страница 60: ...7 A B 21 DF 21 NN n 22 SD B 14 S 23 ST B 12 AA a 24 RD B 16 T 25 RTS B 19 N A 26 RT B 9 X 27 CTS B 13 N A 29 DM B 22 N A 31 RR B 10 N A 34 MC B 23 DD d There are jumpers on the PL 6031 EIA 422 interfa...

Страница 61: ...ection The SLM 3650 is available with a Winchester V 35 as the data I O connector PL 6032 There is a jumper on the unit that either opens or closes the CC line The interface is shipped with jumpers in...

Страница 62: ...red connector will be reinstalled However the operator does have an option to install a different configured connector Refer to Table 2 8 for a matrix explaining connector options Table 2 8 Connector...

Страница 63: ...I O Connector J8 Installation 1 For Ribbon Configured Connector PL 6031 Install Data I O connector J8 Figure 2 7 as follows a Position connector J8 in rear panel CAUTION Use care when connecting the...

Страница 64: ...MN SLM3650 IOM 2 16 For Ribbon Configured Connector For 50 Pin Connector with Overhead Interface Board Figure 2 7 Data I O Connector J8 Removal Installation Artisan Technology Group Quality Instrument...

Страница 65: ...orts the 75 unbalanced Master Clock interface 15 Pin Connector The 15 pin D connector supports G 703 balanced TX and RX data Balanced Master Clock Open collector Mod and Demod fault Asynchronous overh...

Страница 66: ...to 10V for a receive signal level between 25 and 60 dBm AUX 1 connection is a 9 pin female D connector J9 located on the rear panel of the modem Screw locks are provided for mechanical security on th...

Страница 67: ...security on the mating connector Refer to Table 2 11 for pinout information Table 2 11 Alarms Connector and Pinouts J10 Pin Signal Function Name 1 Alarm 1 is faulted NO 2 COM 3 Alarm 1 is not faulted...

Страница 68: ...e selected and demodulated to produce clock and data at the Data I O connector 2 3 8 External Reference CP3 CP3 is a TNC connector for an external reference The input impedance is 50 For normal operat...

Страница 69: ...y between these modems and the SLM 3650 is guaranteed Benefits of Turbo Product Code FEC include Enhanced BER Performance QPSK 3 4 rate Turbo provides nearly a 2 dB improvement over Viterbi 3 4 rate c...

Страница 70: ...values below 4 0 dB Performance is virtually error free above 4 0 dB Eb No and operation below this level is not recommended 2 4 2 Data Rate Modulation Type Encoding Type Data Rate Range BPSK 5 16 Ra...

Страница 71: ...e kit includes the following items Upgrade Kit Part Number KT 9672 1 1 PL 9394 1 Turbo Codec Module 2 FW 6535 1V or later version M C firmware 3 FW 6094W or later version Bulk firmware 4 Installation...

Страница 72: ...all normal precautions for handling electrostatic sensitive devices 10 4 10 3 10 5 10 6 BER 10 7 10 9 10 8 10 10 1 0 2 0 3 0 4 0 Eb N0 dB 5 0 6 0 7 0 8 0 9 0 10 2 BPSK 21 44 Rate QPSK OQPSK 3 4 Rate 8...

Страница 73: ...lation refer to Figure 2 11 If replacement Firmware IC s were sent with the Turbo Board remove existing Firmware U86 and U74 with PLCC type IC puller If puller is not available use ice pick type tool...

Страница 74: ...reen reads Utility Modulator then press the Enter key 5 Press the arrow key until the screen reads Encoder Type then press the Enter key then key to get Turbo press Enter 6 Press Clear then press the...

Страница 75: ...ite Modem Revision 3 Installation MN SLM3650 IOM 2 27 Figure 2 9 Card Removal I O MODULE SIMM SOCKETS CARD 1 OVERHEAD BOARD Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE ww...

Страница 76: ...te Modem Revision 3 Installation MN SLM3650 IOM 2 28 Figure 2 10 Turbo Codec Card Installation U74 U86 TURBO CODEC INSTALLED Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE w...

Страница 77: ...Module 2 FW 6535 1AA or later version M C firmware 3 FW 6094W or later version Bulk firmware 4 Installation instructions 5 FW 9600C or later version Turbo Firmware if Turbo is installed The modems mus...

Страница 78: ...existing Firmware U86 and U74 with PLCC type IC puller If puller not available use ice pick type tool to alternately carefully pry upward at opposite corners of IC 7 Install the replacement Firmware...

Страница 79: ...ed the Reed Solomon option is avalible as normal under Configuration Modulator Demodulator menu Figure 2 11 Duplex Reed Solomon Setup I O MODULE SIMM SOCKETS CARD 1 OVERHEAD BOARD Card Slot 2 Card Slo...

Страница 80: ...evision 3 Installation MN SLM3650 IOM 2 32 Figure 2 12 Installation of Duplex Reed Solomon U74 U86 DUPLEX REED SOLOMON CODEC INSTALLED Artisan Technology Group Quality Instrumentation Guaranteed 888 8...

Страница 81: ...enables control of modem configuration parameters and displays the modem status SATELLITE MODEM TRANSMIT RECEIVE TRANSMIT RECEIVE COMMON STORED POWER ON TRANSMITTER ON CARRIER DETECT TEST MODE A L A R...

Страница 82: ...it chain Receive Red A fault condition exists in the receive chain Common Red A common equipment fault condition exists Stored Yellow A fault has been logged and stored The fault may or may not be act...

Страница 83: ...y to the previous selection Left and Right Diamond Keys ef These keys are used to move to the next selection or to move the cursor for certain functions Note Throughout this chapter and are used to in...

Страница 84: ...1 W Updated menus to reflect current application 7 1 13 FW6535 1 AP Updated menus to reflect current application 7 1 16 FW 6535 1 AU Added duplex reed solomon 3 3 Data Rates Code Rate Data Rate Range...

Страница 85: ...is Function Select To access this level from the sign on message press the or keys From the Function Select menu select one of the functional categories Configuration Monitor Faults Alarms Stored Faul...

Страница 86: ...initiates the necessary programming by the modem To undo a parameter change prior to execution press CLEAR Notes 1 Menus or commands that are specific to certain modem configurations are only accessi...

Страница 87: ...re 3 21 UTILITY FACTORY SETUP Figure 3 22 CONFIGURATION SAVE Figure 3 10 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key FUNCTION SELECT STORED FLTS ALMS Figure 3 14 FUNCTI...

Страница 88: ...z RS ENCODER ON OFF Reed Solomon Option only ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key FUNCTION SELECT CONFIGURATION FUNCTION SELECT CONFIGURATION CONFIGURATION MODUL...

Страница 89: ...g cursor Press ENTER to execute the change Note When the transmitter frequency is changed the transmitter is automatically turned off to prevent the possible swamping of other channels To turn the tra...

Страница 90: ...carrier signal The upper side band is at one quarter of the symbol rate from the carrier When inverted spectrum is selected this generates a single lower side band suppressed carrier Upon entry the C...

Страница 91: ...one of the proper overhead types and data rates apply the Reed Solomon Encoder program in the ON state will be rejected double beep Programs the Reed Solomon encoder ON or OFF Upon entry the current s...

Страница 92: ...ON 50 TO 180 MHz in 1 Hz steps ON OFF ON OFF Always OFF in Turbo mode ON OFF ON OFF O to 999 Seconds RS DECODER ON OFF CORRECTION_OFF Reed Solomon Option only ACCESS TO SUBMENU CONDITIONAL OR OPTION D...

Страница 93: ...with the flashing cursor on the first character Press or to move the flashing cursor and or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change DESCRAMBLER Pro...

Страница 94: ...weep center frequency can be set in the range from 35000 to 35000 Hz Upon entry the current programmed setting is displayed with a flashing cursor on the first character Press or to move the flashing...

Страница 95: ...y the current status of the Reed Solomon decoder is displayed Use or to select one of the following modes ON Enables the Reed Solomon decoder to provide data error corrections CORRECTION_OFF Turns off...

Страница 96: ...bit steps 1 to 9 ms 0 BYPASS Yes No OFF ON Note TX and RX data rates must match or ASLT option installed TX CODING FORMAT AMI B8ZS HDB3 TX G 703 only RX CODING FORMAT AMI B8ZS HDB3 RX G 703 only TX D...

Страница 97: ...S INSERT SAT T SLOT TERR All other Formats RX D I overhead only ASYNC TX BAUD BAUD RATES bps 110 150 300 600 1200 2400 4800 9600 19200 38400 TX ASYNC only ASYNC RX BAUD ASYNC TX LENGTH BAUD RATES bps...

Страница 98: ...urrent setting of the TX clock phase is displayed Press or to make the selection When AUTO is selected the modem will automatically select NORMAL or INVERT to properly phase the TX clock with the TX d...

Страница 99: ...to select the desired buffer size The buffer size is displayed in seconds or bits Enter the Function Select Utility Interface menu to change the buffer units to seconds or bits If selecting seconds c...

Страница 100: ...the current status is displayed or to make the selection Press ENTER to execute the change Conditional This menu is only available when the overhead interface PCB or Reed Solomon PCB is installed LOOP...

Страница 101: ...the modem to receive a 2047 pattern as the normal receive data and allows the BER monitor to work on that 2047 pattern Upon entry the current status is displayed Press or to select on or off Press EN...

Страница 102: ...Signaling T1_S Special Signaling Upon entry the current drop data channel signal is displayed Press or to make the selection Press ENTER to execute the change Conditional This menu is only available...

Страница 103: ...formats Upon entry satellite channel 1 and the current terrestrial frame slot are displayed Press or to select the satellite channel to be programmed Press ENTER to choose the satellite channel to be...

Страница 104: ...for 5 6 7 or 8 bits Upon entry the current status of the ASYNC RX word length is displayed Press or to make the selection Press ENTER to execute the change Conditional The menu is only available when...

Страница 105: ...nction Select Utility Modem Type ASYNC and requires that the Overhead Card is installed ASYNC RX PARITY Programs the ASYNC overhead receive parity for Even Odd or None Upon entry the current status of...

Страница 106: ...0 dBm In 0 5 dBm steps 3 2 to 16 0 dB In 0 1 dB steps 0 5 to 6 0 dBm min In 0 5 dBm min steps HOLD NOMINAL MAXIMUM 5 0 to 30 0 dBm In 0 5 dBm steps 5 0 to 30 0 dB In 0 5 dBm steps HOLD NOMINAL MAXIMU...

Страница 107: ...dBm in 0 5 dBm steps Upon entry the current maximum power level is displayed Press or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change TARGET NOISE Program...

Страница 108: ...D OR 0 6 to 4000 kbit s in 100bit s steps EIA 232 EIA 422 ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information TRIBUTARY n CLOCK DATA n 1 8 CLK NRM OR INV DATA NRM OR INV TRIBUTARY...

Страница 109: ...ecrement the selected kbps Press ENTER to execute the change TRIBUTARY CLOCK DATA Select the tributary 1 8 and program the clock phase to Normal Invert On entry the current status is displayed Press o...

Страница 110: ...LED TX CHAN 3 MODE ASYNC RS 232 SYNC RS 232 ASYNC RS 422 SYNC RS 422 AUPC DISABLED TX CHAN 3 DR SYNC RS 422 0 6 to 4000 0 kbit s ALL OTHER MODES 0 6 to 64 0 kbit s TX CHAN 3 PHASE NORMAL INVERTED TX C...

Страница 111: ...for D I RX CHAN 2 MODE ADPCM ENABLED ADPCM DISABLED RX CHAN 3 MODE ASYNC RS 232 SYNC RS 232 ASYNC RS 485 SYNC RS 485 AUPC DISABLED RX CHAN 3 DR SYNC RS 422 0 6 to 4000 0 kbps ALL OTHER MODES 0 6 to 6...

Страница 112: ...Channel Overhead 3 EIA 232 EIA 422 or AUPC Channel Overhead 4 EIA 232 EIA 485 or AUPC Refer to Figure 3 9 TX CHAN 1 MODE Programs the TX Channel 1 MODE D I Enabled T1 E1 Enabled Disabled Press or to...

Страница 113: ...ss or to move the flashing cursor and or to increment or decrement the selected kbps Press ENTER to execute the change TX CHAN 3 PHASE Programs the TX 3 PHASE NRM or INV Note Not displayed if AUPC or...

Страница 114: ...I Enabled T1 E1 Enabled Disabled Press or to move the flashing cursor and or to increment or decrement the selected kbps Press ENTER to execute the change RX CHAN 1 DR Programs the RX Channel 1 DR TX...

Страница 115: ...nge RX CHAN 3 PHASE Programs the RX 3 PHASE NRM or INV Note Not displayed if AUPC or Disabled is selected Press or to move the flashing cursor and or to increment or decrement the selected kbps Press...

Страница 116: ...When calculating the symbol rate based on the programmed code rate D I overhead 16 15 if enabled and Reed Solomon overhead 126 112 or 219 201 if enabled must be included 3 Channels 3 and 4 data rates...

Страница 117: ...he M C There are five memory locations that may be used to store specific configuration setups that are frequently used After changing the configuration parameters to the desired settings enter the Co...

Страница 118: ...2 CURRENT Eb No or No Data if Carrier is not locked Range 2 0 to 16 0 dB CURRENT RECEIVE LEVEL 10 0 to 60 0 dBm CURRENT SWEEP FREQUENCY 35 000 to 35 000 Hz or No Data if carrier is not locked CURRENT...

Страница 119: ...s the current Eb N0 or No Data if carrier is not locked Range 2 0 to 16 0 dB Note Low limit is based on the data rate High limit is 16 0 dB RECEIVE SIGNAL Displays the current receive signal level Ran...

Страница 120: ...SLM 3650 Satellite Modem Revision 3 Operation MN SLM3650 IOM 3 40 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 121: ...me For each parameter monitored fault status is displayed as one of the following indicates that no fault or alarm exists indicates that a fault exists and will cause switching in a redundant system R...

Страница 122: ...ER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL RX INSERT RX AUDIO 1 CLIP RX AUDIO 2 CLIP CONFIGURATION BATTERY CLOCK 12 VOLT SUPPLY 12 VOLT SUPPLY 5 VOLT SUPPLY SELF TEST CONTROLLER INTERFACE MODULE B...

Страница 123: ...dulator configuration fault 3 4 10 2 Function Select Demodulator Faults CARRIER DETECT Carrier detect fault Indicates the decoder is not locked IF SYNTHESIZER Demodulator IF synthesizer fault Indicate...

Страница 124: ...one is selected in the Interface Configuration menu the TX Data AIS Fault Alarm is not activated Note AIS is an alarm not a switching fault TX CLK PLL Transmitter phase locked loop fault Indicates the...

Страница 125: ...that the frame BER exceeds 1 3 BACKWARD ALARM Backward alarms BUFFER CLK PLL Buffer clock phase locked loop fault Indicates the buffer clock PLL is not locked BUFFER CLK ACT Activity detector alarm of...

Страница 126: ...ndicates that the interface module is missing or will not program 3 4 10 6 Function Select Backward Alarms BW Alarm RX 4 Receive backward alarm 4 indicator BW Alarm RX 3 Receive backward alarm 3 indic...

Страница 127: ...uipment fault 0 and common equipment fault 1 respectively On entering the stored faults level press or to move between the fault groups and the Clear Stored Faults selections The time and date of the...

Страница 128: ...EL BUFFER UNDERFLOW BUFFER OVERFLOW RX DATA AIS FRAME BER BACKWARD ALARM BUFFER CLK PLL BUFFER CLK ACT DEMUX LOCK RX 2047 LOCK BUFFER FULL RX INSERT RX AUDIO 1 CLIP RX AUDIO 2 CLIP CONFIGURATION STORE...

Страница 129: ...ess ENTER to execute the change Note This program is for control or last known status B BAND LOOPBACK Programs the remote baseband loopback ON or OFF Upon entry the current status of the remote baseba...

Страница 130: ...Control or last known status ASYNC option only TX 2047 PATTERN ON OFF Control or last known status ASYNC option only Figure 3 15 Remote AUPC Configuration Menu SLM3650 TYPE VER X X X FUNCTION SELECT...

Страница 131: ...rrent Firmware Test Mode Status Overhead Type Revision Emulation Lamp Test Provisions also are made for assigning data and code rates to the modulator and demodulator After entering the Function Selec...

Страница 132: ...LE EFD CLOSED NORMAL INVERT MOD SPECTRUM TX BPSK ORDERING ENCODER TYPE STANDARD NON STANDARD VITERBI SEQUENTIAL TURBO 4 8 tp 2500 ksps Status only ON OFF 4 8 16 DEEP TX R S INSTALLED ONLY TX RS INTERL...

Страница 133: ...eature does not actually change the modulator power level but displays an offset value in the monitor The modulator power offset range is 99 9 to 99 9 dB in 0 1 dB steps Note Anything except 0 0 dB wi...

Страница 134: ...te the change Conditional Only available when 8 PSK option and RS option are installed and selected TX IESS 315 MODE Selection with TURBO Upon entry the current status of the utility menu is displayed...

Страница 135: ...CONDITIONAL OR OPTION DEPENDENT ACCESS TO SUBMENU CONTINUOUS or BURST RX MODE DEMOD SPECTRUM NORMAL INVERT 4 8 16 DEEP RX R S INSTALLED ONLY RX RS INTERLEAVE TX RS DUPLEX N 225 K 205 I 8 R S DUPLEX I...

Страница 136: ...ve filtering Note CSC Closed Demodulator type is not compatible with a 3 4 Code Rate and Sequential Decoder type DECODER TYPE Conditional Changes only when Modem Type under Function Select Utility Mod...

Страница 137: ...RATE Programmable with 4 800 to 2500 kbps Status Only Upon entry the current status of the utility menu is displayed Press or to make the selection Press ENTER to execute the change RX MODE Select Co...

Страница 138: ...installed BITS MILLI SECONDS OFF ON RX TERR INTERFACE ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key RS 232 RS 422 V 35 G 703 G 703 only with overhead PCB installed TX DA...

Страница 139: ...ALARM TX 3 ON OFF BW ALARM TX 2 ON OFF BW ALARM TX 1 ON OFF IDR only ASYNC RX TYPE RS 232 RS 485 RX ASYNC only ACCESS TO SUBMENU CONDITIONAL OR OPTION DEPENDENT Parameter Information Key IDR RX ESC TY...

Страница 140: ...the plesiochronous shift set the buffer units to MILLI SECONDS For a specific buffer depth set the buffer units to BITS FRAMING STRUCTURE Displays the currently selected framing type and structure of...

Страница 141: ...ess ENTER to execute the change Conditional This selection is available only when IDR is enabled ASYNC TX TYPE Select EIA 232 EIA 485 4 WIRE or EIA 485 2 WIRE for ASYNC overhead type Conditional Avail...

Страница 142: ...GIT SELF TEST OFF AUTO RUN M C FIRMWARE FW NNNNNN DDR MM DD YYYY BOOT FIRMWARE FW NNNNNN DDR MM DD YYYY BOOT FIRMWARE VER X X X TEST MODE STATUS RS CORR OFF INTRFC LOOPBACK B BAND LOOPBACK RF LOOPBACK...

Страница 143: ...OPTION DEPENDENT Parameter Information Key EXT AGC MIN PWR 0 0 to 10 0 VOLTS in 0 5 v steps EXT AGC MAX PWR 0 0 to 10 0 VOLTS in 0 5 V steps MASTER RESET HARD SOFT F Figure 3 20 Utility System Menu Co...

Страница 144: ...s displayed 1 to 255 To change the remote address press ENTER Press or to make the selection Press ENTER to execute the change REMOTE TYPE Select EIA 485 2 Wire EIA 485 4 Wire or EIA 232 OPERATION MOD...

Страница 145: ...menu Press ENTER to begin Press or to increment or decrement the number at the flashing cursor from 0 to 100 Press ENTER to execute the change EXT AGC MIN PWR Sets the AGC voltage for a RX signal lev...

Страница 146: ...saves the current configuration settings Select ENTER once to access HARD or SOFT Press or to make the selection Press ENTER Press five times to move the cursor to YES Select YES and press ENTER agai...

Страница 147: ...SLM 3650 Satellite Modem Revision 3 Operation MN SLM3650 IOM 3 67 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 148: ...ITY ASLT VITERBI SEQUENTIAL SINGLE RATE LOW RATE VAR FULL RATE VAR CARD 1 PCB CARD 2 PCB CARD 3 PCB 8PSK TX ONLY RX ONLY OQPSK BURST G G 703 OPERATION UNBALANCED BALANCED G 703 PERSONALITY I O PCB INS...

Страница 149: ...TE NOT APPLICABLE FOR TURBO LOCAL MODEM AUPC ON OFF OFF WITH TX RX ASYNC OVERHEAD REED SOLOM0N 02 REED SOLOMON 03 REED SOLOMON DUPLEX TURBO INSTALLED NOT INSTALLED G MODEM SERIAL 123456789 ACCESS TO S...

Страница 150: ...e entered the modem will not change any parameters If the modem type is changed to Custom no parameters will be changed If the modem will not allow the modem type selection that type of operation may...

Страница 151: ...s ENTER to execute the change Notes 1 Programming a current version default allows all features and options if installed to operate normally 2 Programming a FUNCTIONAL version X eliminates any changes...

Страница 152: ...to move from one symbol to the next The first line will display the option The second line will display the status A symbol indicates the option is installed A symbol indicates the option is FAST acce...

Страница 153: ...Solomon 02 List Intelsat or AUPC or Reed Solomon 03 List Intelsat or AUPC or Duplex Reed Solomon Intelsat or AUPC or Note Not applicable for Turbo mode Displays installed Reed Solomon options CARD 3 O...

Страница 154: ...r on the first character Press or to move the flashing cursor Press or to increment or decrement the digit at the flashing cursor Press ENTER to execute the change Entering this code enables the corre...

Страница 155: ...ONAL OR OPTION DEPENDENT Parameter Information Key Figure 3 22 Utility Factory Setup Menu 3 4 14 6 Function Select Utility Factory Setup Refer to Figure 3 22 CAUTION This command is used for factory c...

Страница 156: ...ut changing the programmed frequency of the demodulator When RF loopback is turned OFF the demodulator is programmed back to the previous frequency CUSTOMER DATA IBS IDR or 308 2 INTERFACE ENCODER MOD...

Страница 157: ...and cabling between the modem and the customer equipment The baseband loopback is not bi directional in D I CUSTOMER DATA IBS or IDR INTERFACE ENCODER MODULATOR TRANSMIT RF EQUIPMENT ANTENNA AC POWER...

Страница 158: ...YNC Asynchronous Overhead EFD Comtech EF Data Closed Network CUSTOM Access all modes AUPC Automatic Uplink Power Control VSAT IBS Intelsat compliant No Overhead 3650 00 No Overhead OM 73 3650 02 ASYNC...

Страница 159: ...IF Output ON Configuration Demodulator RX Data Code Rate RX V QPSK 3 4 Configuration Demodulator TX Clock Source TX Terrestrial Internal Ext Reference Configuration Interface Buffer Clock Source Satel...

Страница 160: ...ype TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Output ON Configuration Demodulator RX Data Code Rate RX V QPSK 1 2 Configuration Demodulator TX Clock Source TX Terrestrial Internal...

Страница 161: ...lock Configuration Interface TX Coding Format HDB3 Configuration Interface RX Coding Format HDB3 Configuration Interface Drop Format E1CCS E1CAS E1 Configuration Interface Insert Format E1CCS E1CAS E1...

Страница 162: ...8 Configuration Demodulator Encoder Type Viterbi Sequential Utility Modulator Decoder Type Viterbi Sequential Utility Demodulator ASYNC TX Baud 110 to 38400 bit s Configuration Interface ASYNC RX Bau...

Страница 163: ...ible with any Comtech EF Data closed network application The modem can be compatible with other closed network applications by selecting different modulator and demodulator types Fairchild and Comstre...

Страница 164: ...703 the modem must have the required G 703 Overhead board installed 3 5 1 6 Custom Operation Note If the modem serves as the backup unit for a rack of modems having different hardware and FAST options...

Страница 165: ...ngs Parameter Front Panel Settings Reference Menu Modem Emulation SDM 100 Utility Modem Type TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Output ON Configuration Modulator RX Data Cod...

Страница 166: ...ront Panel Setting Reference Menu Modem Emulation SDM 6000 Utility Modem Type TX Data Code Rate TX V QPSK 1 2 Configuration Modulator TX IF Output ON Configuration Modulator RX Data Code Rate RX V QPS...

Страница 167: ...em is an option for both EIA 422 and V 35 operation SCT LOOP SCT INTERNAL clock no longer applies when the modem has loop timing on The TX clock source is now recovered from the RX satellite data This...

Страница 168: ...rt to the low stability internal reference automatically 3 6 4 IDR IBS G 703 Master Slave Use this application when the far end earth station does not have local access to a high stability reference c...

Страница 169: ...SATELLITE SATELLITE CLOCK RECOVERY CLOCK RECOVERY BUFFER BUFFER RD RD RT RT BUFFER CLOCK TX TERRESTRIAL BUFFER CLOCK TX TERRESTRIAL MASTER BOP BOP DTS DTS EXT REF EXT REF RECEIVE RECEIVE SD SD TT TT S...

Страница 170: ...TION SATELLITE SATELLITE CLOCK RECOVERY DATA CLOCK BUFFER BUFFER RD RD RT RT BUFFER CLOCK TX TERRESTRIAL BUFFER CLOCK RX SATELLITE CLOCK MASTER BOP BOP DTS DTS EXT REF EXT REF RECEIVE SD SD TT TT ST S...

Страница 171: ...RECOVERY BUFFER DATA CLOCK RD BUFFER CLOCK TX TERRESTRIAL MASTER BUFFER CLOCK TX TERRESTRIAL CLOCK RECOVERY BUFFER HIGH STABILITY OSCILLATOR INTERNAL OSCILLATOR SD BOP DTS DTS BOP CLOCK RECOVERY TRANS...

Страница 172: ...RECOVERY CLOCK RECOVERY BUFFER RD RD BUFFER CLOCK TX TERRESTRIAL BUFFER CLOCK RX SATELLITE CLOCK MASTER BOP BOP DTS DTS NOTE TERRESTRIAL EQUIPMENT MUST RECOVER THE CLOCK FROM RECEIVED DATA RECEIVE REC...

Страница 173: ...AVE SIDE THE MODEM SETTINGS REMAIN AS MASTER MASTER THE USER EQUIPMENT WILL NEED TO RECOVER THE TIMING FROM THE RECEIVE DATA IF A MASTER SLAVE CLOCK ARRANGEMENT IS DESIRED BOP CLOCK RECOVERY CLOCK REC...

Страница 174: ...c is too fast an occasional bit will be lost If incoming traffic is too slow an occasional bit will be repeated Doppler buffer of the signal of the satellite The Doppler shift results from the figure...

Страница 175: ...ERROR INTERFACE 1 INCOMING TRAFFIC TOO FAST BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 1 BIT 2 BIT 3 BIT 3 BIT 4 BIT 5 BIT 6 ERROR INTERFACE 2 INCOMING TRAFFIC TOO SLOW f1 f2 f1 IS NOT EXACTLY EQUAL TO...

Страница 176: ...ORBIT THUS PROLONGING THE LIFE OF THE SATELLITE A SATELLITE IS MAINTAINED AT AN ASSIGNED GEOSTATIONARY LOCATION THROUGH THE USE OF GROUND COMMAND ADJUSTMENTS TO ITS N S AND E W LOCATION THIS PROCESS...

Страница 177: ...creases The orbit of the satellite can result in a peak to peak altitude variation of 2 85 km while the station keeping of a newly launched satellite will typically be 0 1 150 km The total effect will...

Страница 178: ...the satellite and will empty using the local clock The object of the buffer is to ensure that the buffer overflows or underflows at regular determinable intervals typically every 40 days The buffer de...

Страница 179: ...otal or 2 ms 3 7 1 3 1 Multiples of the Frame Length If this setting is set to NONE the user can choose any buffer depth 3 7 1 4 Total Buffer Length T1 and E1 framing structure under G 704 is availabl...

Страница 180: ...SLM 3650 Satellite Modem Revision 3 Operation MN SLM3650 IOM 3 100 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 181: ...es to other modems within the modem when necessary The modem configuration parameters are maintained in battery backed RAM which provides total recovery after power down situation The M C functions in...

Страница 182: ...tal to Analog Converter DAC Read Only Memory ROM Analog to Digital Converter ADC Read Access Memory RAM Universal ASYNC User Interface Fault and Alarm Relays MODEM 11 MHz CLOCK I C BUS 2 RAM AND REAL...

Страница 183: ...ry to see if valid data has been retained If valid data has been retained the modem is reconfigured to the parameters maintained by the RAM 2 If the non volatile memory fails the valid data test a def...

Страница 184: ...ure each modem for one address between 1 and 255 Each modem on a common remote communications link EIA 485 must have a distinct address Use the front panel control in the Function Select Utility Syste...

Страница 185: ...ulated BER Threshold NONE Modem Reference Internal Sweep Center 0 Hz RS Encoder OFF Sweep Range 60000 Hz Reacquisition 0 seconds RS Decoder OFF Configuration Interface TX Clock Source TX Terrestrial S...

Страница 186: ...ate B 128 kbps QPSK 1 2 RX Rate B 128 kbps QPSK 1 2 TX Rate C 256 kbps QPSK 1 2 RX Rate C 256 kbps QPSK 1 2 TX Rate D 512 kbps QPSK 1 2 RX Rate D 512 kbps QPSK 1 2 TX Rate V 38 4 kbps QPSK 1 2 RX Rate...

Страница 187: ...2 wire Turbo Firmware FW NNNNNNR Operation Mode Duplex Display Contrast 64 Year Display 2 digit EXT AGC MIN PWR 0 0 Volts Self Test OFF EXT AGC MAX PWR 10 0 Volts Utility Modem Type Modem Type Custom...

Страница 188: ...3 for a description of each modulation type A block diagram of the modulator is shown in Figure 4 2 INTERFACE MUX OPTIONAL FRAMING UNIT IBS IDR ASYNC AUPC DROP INSERT OPTIONAL REED SOLOMON ENCODER MO...

Страница 189: ...o 781 25 kbps 5 16 Rate BPSK 4 8 kbps to 2386 363 kbps 1 2 Rate O QPSK 64 kbps to 5 0 Mbps 3 4 Rate 8PSK Symbol Rate Range 4 8 ks s to 2 5 Ms s Test Modes Carrier Null and Quadrature Dual and Offset F...

Страница 190: ...75 optional Output Return Loss 20 dB minimum Scrambler Type V 35 Differential Encoding 2 phase or none FEC Convolution Encoding Viterbi or Sequential Encoding Rate 1 2 3 4 7 8 2 3 Viterbi TCM Rate 1 2...

Страница 191: ...nal encoder for encoding the baseband data The code rates 1 2 3 4 7 8 and 2 3 are based on the symbol rate range of 2 4 kbps to 2 5 Mbps For Viterbi codes the convolutional encoder encodes the data at...

Страница 192: ...odule The amplifier circuitry provides programmable control of the output level over a range of 5 to 30 dB in 0 1 dB steps The amplifier has power leveling of 0 5 dB to maintain the stability of the o...

Страница 193: ...3 4 rate 8 4 kbps to 4 375 Mbps 7 8 rate Using vector analysis of the constellation pattern QPSK represents a symbol with the carrier phase angle at 45 135 225 or 315 The 1 2 3 4 and 7 8 rates encoded...

Страница 194: ...rforms FEC on the data stream using Viterbi or Sequential decoding algorithms DIGITAL SIGNAL PROCESSING DIGITAL CLOCK RECOVERY LOOP SWITCH REF VCXO REF PLL OC XO OPT HIGH STABILITY AGC LPF BPF LO 2 LO...

Страница 195: ...kbps to 1193 181 kbps 21 44 Rate BPSK 2 4 kbps to 781 25 kbps 5 16 Rate BPSK 4 8 kbps to 2386 363 kbps 1 2 Rate O QPSK 64 kbps to 5 0 Mbps 3 4 Rate 8PSK Symbol Rate Range 4 8 ks s to 2 5 Ms s IF Freq...

Страница 196: ...ion of the I and Q channels is optimized for the Costas and Clock loops as well as the soft decision mapping circuitry When the active decoder determines that the modem is locked the M C stops the swe...

Страница 197: ...erts the digital I and Q data to 3 bit soft decision values These values are then fed to the programmable vector rotation circuit providing compatibility with spectrum reversal of the I and Q channels...

Страница 198: ...ntial or Viterbi Decoder FAST options with Reed Solomon hardware Sequential or Viterbi Decoder FAST options with Turbo Codec hardware FAST options with Overhead hardware Sequential or Viterbi Decoder...

Страница 199: ...ta communication standards MIL STD 188 EIA 449 EIA 232 or V 35 The interface receivers and drivers for these standards as well as the handshake signals for MIL STD 188 and V 35 are selectable through...

Страница 200: ...A RXTERR RX CLOCK RXCLK PLESIOCHRONOUS BUFFER PROCESSORS OVERHEAD DEMUX RX DATA RXSAT MUX SCT EXT TXCLK HI STAB RX OVERHEAD BACKWARD ALARMS LINE LINE DRIVERS DRIVERS BWA FORM C RELAYS DRIVERS RELAY DR...

Страница 201: ...k Reference Normal derived from SD for G 703 interface SCTE TT Internal 10 5 accuracy Optional 2 x 10 7 high stability External Plesiochronous Buffer Included in receive path Buffer Clock Reference TX...

Страница 202: ...Table 4 6 for V 35 specifications Table 4 6 V 35 Specifications Parameter Specification Circuit Supported SD SCT SCTE RD SCR DSR RLSD RTS CTS MC Amplitude RD SCR SCT SD SCTE 55V pk 20 differential int...

Страница 203: ...RXD RXC ST CTS DM DSR True 10V 5V False 10V 5V Receiver Amplitude TXD TXC RTS LL MC True Minimum 1V False Maximum 1V Impedance 5000 2000 2500 pF Signals Description TXC Send Data RXC Receive Data RTS...

Страница 204: ...maximum slide of 0 5 ms The fill status is available as a monitor and is accurate to 1 Overflows or underflows are stored in the stored fault section of the M C status registers along with the date an...

Страница 205: ...input to the buffer The front panel interface provides four clock selections clocking the data out of the buffer Internal Clock SCT RX Recovered Clock RXCLK External Clock EXT TX Clock Dejittered TXC...

Страница 206: ...n service and fault the modem The outputs of the demodulator fault relay are available as follows Pins DF C and DF NO on the 50 pin D IDR interface connector J8 9 pin D modem fault connector J7 The re...

Страница 207: ...the EIA 232 or EIA 485 remote interface connector that is integrating a modem or switch into a computer network Refer to Appendix B for the remote interface specification In addition to the four back...

Страница 208: ...3650 Satellite Modem Revision 3 Theory of Operation MN SLM3650 IOM 4 28 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg c...

Страница 209: ...ng external equipment A 2047 pattern is generated by the modem and routed through all sections This is accomplished by placing the modem in IF and baseband loopbacks Pseudo Gaussian noise is introduce...

Страница 210: ...2 Set up the modem for baseband loopback operation by using the Configuration Interface front panel menu Chapter 3 The modem will run error free Refer to Chapter 3 for a block diagram of the baseband...

Страница 211: ...menu will display signal level raw BER corrected BER and Eb N0 Refer to Chapter 1 for examples of BER performance curves 5 Connect a spectrum analyzer to the modem as shown in Figure 5 2 Ensure the I...

Страница 212: ...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 8 12 8 12 8 11 0 12 8 10 3 13 5 13 3 1...

Страница 213: ...Modem Rate 2144kbit s 3 4 Rate Coding with 7 7 dB Eb No S N N 10 dB Figure 5 2 Typical Output Spectrum with Noise ATTEN 10 dB 5 00 dB DIV CENTER FREQUENCY 140 000 MHz RL 20 29 dBm PASS CENTER 140 000...

Страница 214: ...rrier detect LED is on and the DEMUX lock fault has been cleared where applicable the modem will run at the specified error rate Run the TX power level input amplitude over the full range and offset t...

Страница 215: ...tellite Modem Revision 3 Maintenance MN SLM3650 IOM 5 7 WITH NOISE WITHOUT NOISE Figure 5 4 Typical Eye Constellations Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www art...

Страница 216: ...on required to repair the modem If any of the troubleshooting procedures mentioned earlier in this chapter do not isolate the problem and Comtech EF Data Customer Support assistance is necessary have...

Страница 217: ...X X X X X Q CHANNEL X X X X X X AGC X X X X X X MODEM REF ACT X X X MODEM REF PLL X X X X X X MODULE X X X X X X CONFIGURATION X X X DEMODULATOR FAULTS CARRIER DETECT X X X X X IF SYNTHESIZER X X X X...

Страница 218: ...X X TX AUDIO 2 CLIP X X CONFIGURATION 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 X X BACKWARD ALARM X X X X BUFFER CLK PLL X X X X BUFFER CL...

Страница 219: ...12V POWER SUPPLY X X X 5V SUPPLY X X X SELF TEST X CONTROLLER X X X X X INTERFACE MODULE X X X X X BACKWARD ALARMS IDR OVERHEAD ONLY BW ALARM RX 4 X X X BW ALARM RX 3 X X X BW ALARM RX 2 X X X BW ALAR...

Страница 220: ...front panel LED could be one of many faults To determine which fault has occurred use the Fault or Stored Fault front panel menu Refer to Chapter 3 for information on the Fault or Stored Fault front...

Страница 221: ...ed to 1640 kbps An IBS type would be programmed for the input data rate to the channel unit The modem accounts for the overhead because of the change in internal reference Use interface loopback for i...

Страница 222: ...is faulted This fault is a hardware failure Contact the Comtech EF Data Customer Support Department I CHANNEL Indicates a loss of activity in the I channel of the quadrature demodulator Typically ind...

Страница 223: ...tion of all 1s or 0s This is referred to as a data stable condition data is not transitioning This fault indicates there is trouble in the chain sending data to the modem The modem passes this signal...

Страница 224: ...enu the RX data AIS is monitoring a fault condition of all 1s or 0s This is referred to as a data stable condition data is not transitioning The fault indicates trouble in receiving data from the sate...

Страница 225: ...se is invalid or absent receive data This is a major prompt alarm The alarm will cause insertion of receive AIS all 1s and the switch over will be attempted This fault is to be sent as a backward alar...

Страница 226: ...12V power supply fault Indicates a high or low voltage condition Level is 5 Check for a short on the 12V line from the power supply or on any of the plug in boards 12 VOLT SUPPLY 12 VDC power supply f...

Страница 227: ...ls 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 alarm is controlled by wiring the backward alarm inputs of the mode...

Страница 228: ...SLM 3650 Satellite Modem Revision 3 Maintenance MN SLM3650 IOM 5 20 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 229: ...ion A 2 1 Reed Solomon Codec A 3 1 Interface A 4 1 Overhead Interface A 5 1 Turbo Product Codec as FEC A 1 2 Implementation A 2 2 Reed Solomon Encoder A 3 2 Reed Solomon Features A 4 2 Installation A...

Страница 230: ...Rate Low Variable Data Rate up to 512 kbps High Variable Data Rate up to 4 375 Mbps Sequential Decoder Viterbi Decoder Asymmetrical Loop Timing 8PSK Reed Solomon Codec Turbo Codec ASYNC AUPC Overhead...

Страница 231: ...into the unit through the front panel keyboard or the rear remote port With the exclusive FAST technology operators have maximum flexibility for enabling functions as they are required FAST allows an...

Страница 232: ...manufacturer for the desired hardware upgrade If the unit displays an X the unit can be upgraded in the field If the unit displays a the feature is installed If the unit displays a the feature is FAS...

Страница 233: ...lt settings with the new option available 11 If a wrong or invalid code is entered the unit will display Wrong Code Entered and no changes will occur Retry the code verify that the code is correct or...

Страница 234: ...splay will exhibit WRONG CODE ENTERED Repeat procedures Contact Comtech EF Data Customer Support personnel for further instructions if the error message remains A 1 2 6 Variable Data Rates The basic p...

Страница 235: ...ly through the EIA 232 interface Selection of the transmit and receive data rates may be made in 64 kbps increments and may be independent of each other The actual satellite rates are 16 15 of the tra...

Страница 236: ...rary order Insert Time Slot Selection Time Slot 0 not Allowed 1 to 24 T1 1 to 31 E1 Arbitrary order Interface Type Transformer coupled symmetrical pair Terrestrial Input Data Rate T1 1544 kbps 100 bit...

Страница 237: ...eering Service Channel ESC Data Interface Type EIA 232 ESC Data Rate Maximum Asynchronous 1 2000 of satellite data rate maximum over sampled ESC Data Circuits Supported SD RD DSR Faults and Alarms Bac...

Страница 238: ...E TIMING LOGIC MUX DEMUX INTERFACE INTERFACE INTERFACE INTERFACE INTERFACE SYNTHESIS SYNTHESIS ALARM MONITOR ES TO ES ASYNC RS 232 RS 485 T1 E1 T1 E1 T1 E1 T1 E1 CLOCK CLOCK TX DEJITTER LOGIC ALARMS B...

Страница 239: ...3650 Satellite Modem Revision 3 Options MN SLM3650 IOM A 11 Figure A 2 D I with Asynchronous Overhead Data Flow Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Страница 240: ...substitution codes Alternate Mark Inversion AMI B8ZS and HDB3 are user selectable during configuration A data loopback function on the insert data is available in this section This enables the user to...

Страница 241: ...erface and sending the signal into the receive fault tree in accordance with IESS 308 Under certain fault conditions defined by IESS 308 the receive user data will be replaced by a pattern with all 1s...

Страница 242: ...f the modem The synchronous channel requires use of the TX clock provided by the modem for operation A 1 3 2 6 Backward Alarm A backward alarm signal is included in the D I overhead The signal is sent...

Страница 243: ...T1 T1 D4 Framing T1_ESF_S T1 Extended Super Frame Special T1_S T1 D4 Framing Special T1_IBS T1 IBS Non Fractional Full 1 544M E1_CCS E1 Common Channel Signaling E1_CAS E1 Channel Associated Signaling...

Страница 244: ...SLM 3650 Satellite Modem Revision 3 Options MN SLM3650 IOM A 16 Figure A 3 E1 Framing Formats Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 245: ...SLM 3650 Satellite Modem Revision 3 Options MN SLM3650 IOM A 17 Figure A 4 T1 Framing Formats Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 246: ...ds Mod Spectrum Normal BER Threshold NONE Demod Spectrum Normal Interface TX Clock Source TX Terrestrial Buffer Size 1 mS Buffer Clock Source Insert Frame Structure T1 Data G 704 TX Clock Phase Auto F...

Страница 247: ...input and output These interfaces can also be selected from the front panel Fixed 1 15 overhead is added to the data when an ASYNC channel is being used With the ASYNC channel enabled the terrestrial...

Страница 248: ...ASYNC AUPC Block Diagram G 703 V 35 TERR DATA TERR CLOCK INPUT FIFO PLL INTERFACE CNT SIGNALS AUPC DATA FROM M C TERR DATA TERR OVERHEAD CLOCK INTERFACE CNT SIGNALS ASYNC DATA ASYNC DATA UART M C CON...

Страница 249: ...mum or Hold REMOTE CL ACTION Defines action that local modem will take if remote modem reports carrier loss Maximum Minimum or Hold LINK MODEM A MODEM B With AUPC enabled on both modems A and B if mod...

Страница 250: ...many sites For full duplex operation use a separate demodulator This option is located in the Function Select Utility Modem Type Local Modem AUPC menu Proceed as follows 1 Locate and enable the optio...

Страница 251: ...interfaces are provided for the terrestrial data source EIA 422 and V 35 The operator must select the terrestrial interface type from the front panel under the Function Select Utility Interface menu...

Страница 252: ...4 3 4 DEMUX Operation The DEMUX section functions in a reverse manner to the MUX side Data including overhead is received from the Demod card in the modem at the overhead rate The DEMUX locates the f...

Страница 253: ...e Send Timing ST pin to output the RX clock The RX clock is sent out the ST pin to the appropriate interface drivers and on to the user The operator is left with the option of clocking terrestrial dat...

Страница 254: ...front panel In the 2 wire mode the EIA 485 receivers are disabled whenever the data is to be transmitted down the 2 wire interface In the 4 wire mode the receiver is always on The receive modem contr...

Страница 255: ...table lists examples If DR 8 000K Baud rate can be 150 or lower If DR 16 000K Baud rate can be 300 or lower If DR 32 000K Baud rate can be 600 or lower If DR 64 000K Baud rate can be 1200 or lower If...

Страница 256: ...A 232 Table A 5 2 EIA 232 EIA 485 4 wire Table A 6 3 EIA 232 EIA 485 2 wire Table A 7 4 EIA 485 4 wire EIA 232 Table A 8 5 EIA 485 4 wire EIA 485 4 wire Table A 9 6 EIA 485 4 wire EIA 485 2 wire Table...

Страница 257: ...inout information found in the applicable configuration section Refer to Figure A 5 and Figure A 6 4 Set the remote modem front panel controls according to the information found in the applicable conf...

Страница 258: ...TX 30 dBm J8 25 PIN ASYNC CONNECTOR EIA 485 25 PIN CONNECTOR TO 9 PIN CONNECTOR INDUSTRY STANDARD LOCAL END REMOTE END BENCH TEST BREAKOUT PANEL 50 PIN 25 PIN ASYNC CONNECTOR BREAKOUT PANEL 50 PIN Fi...

Страница 259: ...TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the breakou...

Страница 260: ...X Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the breakout...

Страница 261: ...n ASYNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the...

Страница 262: ...top 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the breakout pa...

Страница 263: ...op 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the breakout pan...

Страница 264: ...YNC TX Stop 2 bits Utility System Menu Remote Baud Rate Equal to ASYNC TX and RX baud rate Parity Even Address 1 to 255 The local end cable connects the 25 pin female ASYNC connector on either the bre...

Страница 265: ...38400 See A 1 4 3 10 ASYNC TX and RX Length 7 bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits 7 Remote End Modem Settings for EIA 232 Utility Interface Menu ASYNC TX and RX Type EIA 232 Configur...

Страница 266: ...nout for the WYSE terminal cable using an EIA 232 to EIA 485 converter 7 Local End WYSE Cable With Converter 25 Pin Male Connector 9 Pin Male Connector TX RX 2 5 5 TX RX TX RX 14 17 4 TX RX See Note 1...

Страница 267: ...38400 See A 1 4 3 10 ASYNC TX and RX Length 7 bits ASYNC TX and RX Parity Even ASYNC TX Stop 2 bits 8 Remote End Modem Settings for EIA 485 4 Wire Utility Interface Menu ASYNC TX and RX Type EIA 485 4...

Страница 268: ...SE terminal cable using an EIA 232 to EIA 485 converter 8 Local End WYSE Cable With Converter 25 Pin Male Connector 9 Pin Male Connector TX RX 2 5 5 TX RX TX RX 14 17 4 TX RX See Note 18 21 Note Disab...

Страница 269: ...Type EFD Closed Decoder Type Viterbi Demod Spectrum Normal Interface TX Clock Source TX Terrestrial Frame Structure E1 Data G 704 Buffer Clock Source RX Satellite Frame Structure T2 Data G 743 TX Cloc...

Страница 270: ...er MICRO COMPUTER BUS MICROCOMPUTER INTERFACE SYNDROME SHIFT REGISTERA DESCRAMBLER V 35 RECEIVE DAT A DECODER DETECTOR DIFFERENTIAL CHANNEL BER OUTPUT BUFFER PARITY GENERATOR SYNDROME SHIFT REGISTERB...

Страница 271: ...e cumulative metric will decrease rapidly as the error propagates through the taps of the parity generator In this case the decoder tries to back up through the data to the last node where the metric...

Страница 272: ...errors than the input differences in the two can be counted to yield the raw BER The raw BER is sent to the M C for further processing A 1 5 2 Viterbi Decoder The Viterbi decoder operates in conjunct...

Страница 273: ...to determine which symbols have been corrupted by the transmission channel and correct as many errors as possible The code symbols produced by the encoder provide the data for this task The seven fun...

Страница 274: ...means of determining synchronization of the decoder The output data is then descrambled and differentially decoded Both of these processes are optional and may be selected by the user locally or remo...

Страница 275: ...ADPCM audio channels are encoded according to CCITT G 721 The backward alarms are level translated to TTL by threshold comparators set to 2 5V A 1K pull up resistor to 5V is connected to each alarm in...

Страница 276: ...rward in a simple single destination link INTELSAT specifies that any major failure of the downlink chain is to generate a backward alarm The modem has a demodulator fault relay which de energizes in...

Страница 277: ...SLM 3650 Satellite Modem Revision 3 Options MN SLM3650 IOM A 49 Figure A 10 IDR Interface Block Diagram Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 278: ...ESC Data Interface Type EIA 422 ESC Data Rate 8 kbps ESC Data Circuits Supported SD ST RD RT Octet in Octet out Data Signal Phasing Per EIA 449 data changes on the rising clock transition is sampled...

Страница 279: ...n Net RF Loopback OFF Encoder Type Viterbi Sweep Center Freq 0 Hz CW Mode Normal OFF Sweep Range 60000 Hz Mod Power Fixed 0 dB Sweep Reacquisition 0 seconds Mod Spectrum Normal BER Threshold NONE Demo...

Страница 280: ...h the same interface loopback device The receive data is demultiplexed and synchronously descrambled by the demultiplexer The backward alarm is reported to the M C and output by Form C relay contact T...

Страница 281: ...SLM 3650 Satellite Modem Revision 3 Options MN SLM3650 IOM A 53 Figure A 11 IBS Interface Block Diagram Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 282: ...ate is 1 512 of primary data if an EIA 232 clock is provided Octet Clock Pulse Data rate 8 Octet high with every 8th bit EIA 232 Specification Circuit Supported RD TD DSR RTS CTS Amplitude RD RTS True...

Страница 283: ...F Encoder Type Viterbi Sweep Center Freq 0 Hz CW Mode Normal OFF Sweep Range 60000 Hz Mod Power Fixed 0 dB Sweep Reacquisition 0 seconds Mod Spectrum Normal BER Threshold NONE Demod Spectrum Normal In...

Страница 284: ...clock loop reference must be one of the following Transmit terrestrial clock External clock input Receive clock input Notes 1 The clock inputs are as follows a 64 kHz shall be divisible by 8 kHz b 32...

Страница 285: ...ote 2 ST SCT LOOP DDS EXT REF See Note 2 ST INT LOOP See Note 1 RXC PLL ST EXT CLOCK MC PLL ST Notes 1 When CONFIGURATION INTERFACE LOOP TIMING is set to ON SCT INT will change to read SCT LOOP 2 When...

Страница 286: ...p 1 Master site has a 10 MHz clock that is needed as the clock source 2 Unequal data rates 4 096 Mbps and 2 152 Mbps numbers divisible by 8 Master Site Option No 1 1 Set Configuration Modulator Modem...

Страница 287: ...uration Interface Buffer Clock to RX Satellite Buffer Bypass A 1 9 G 703 Note If required refer to Section A 3 for installation of the interface PCB G 703 data is either in AMI B8ZS 8 zero suppression...

Страница 288: ...3V 0 3 1 5V pk into 100 E1 3V 0 3 1 5V pk into 120 Pulse Mask T1 G 703 2 E1 G 703 6 Jitter Attenuation T1 G 824 E1 G 823 Line Code AMI B8ZS B6ZS HDB3 A 1 10 Variable Data Rates The basic platform mod...

Страница 289: ...he modem must have the Reed Solomon PCB installed to access this feature The Reed Solomon Codec PCB is a 4 75 x 6 00 12 07 x 15 24 cm daughter card that is located on the main PCB Figure A 14 TX REED...

Страница 290: ...CDR CLK DECDATA OVERHEAD PROCESSOR RX DATA LOOPBACK MUX DMXDATA DMX CLK RX CLK DEC CLK REED SOLOMON MAIN MAIN PCB Figure A 15 Reed Solomon Codec Block Diagram A 2 1 1 Specifications Refer to Table A 2...

Страница 291: ...n Figure A 16 The Reed Solomon encoder section includes the following circuits Synchronous Scrambler Reed Solomon Codec encoder section Serial Parallel Converter RAM Interleaver Parallel Serial Conver...

Страница 292: ...block of data out of the Codec The letter k represents the number of data bytes in a given block The term n k 2t is the total number of check bytes appended to the end of the data This is referred to...

Страница 293: ...RSWORD 1 RS PAGE RS SYNCH PERIOD UNIQUE WORD BYTES GO INTO THESE BYTES 2 t CHECK BYTES TERRESTRIAL DATA RATE RS CODE n k t 1544 1640 2048 2144 225 205 10 219 201 9 Figure A 17 Reed Solomon Code Page F...

Страница 294: ...Figure A 18 Reed Solomon Decoder Section Block Diagram The data and clock signals come from the demultiplexer on the interface PCB and are sent to the Reed Solomon decoder section The data is sent thr...

Страница 295: ...real data a synchronous FIFO is used to buffer the data and strip the check bytes out of the blocks of data The data then passes through a parallel converter to be serialized The data is sent through...

Страница 296: ...CB Refer Figure A 19 for installation location of the Reed Solomon daughter card CAUTION Turn the power off before installation High current VDC is present Failure to do so could result in damage to m...

Страница 297: ...evision 3 Options MN SLM3650 IOM A 69 Reed Solomon Cards TX or RX or Duplex in either slot Figure A 19 Reed Solomon Codec Installation Artisan Technology Group Quality Instrumentation Guaranteed 888 8...

Страница 298: ...e below for a block diagram of the Reed Solomon Duplex card SOLOMON AUPC TMUXDAT TMUX_EN ASYNC ENABLE REED SOLOMON RS BYPASS TXCLK PLL Divide by 2 RS BYPASS ASYNC ENABLE Correlator Edge Detect Reed So...

Страница 299: ...coder 1 AHA 4011 decoder 2 71256 RAM s 1 74FCT2574 Latch The Reed Solomon Interface on the Spartan 2 features Reed Solomon Encoder Reed Solomon Decoder Variable Interleaver depth Synchronous descrambl...

Страница 300: ...256 126 112 7 384 126 112 7 512 126 112 7 768 126 112 7 1024 126 112 7 1536 126 112 7 IDR with 96 kbit s Overhead 1544 225 205 10 2048 219 201 9 No Overhead ASYNC 64 to 2048 kbps 225 205 10 IDR with 9...

Страница 301: ...a method of monitoring the insertion rate is necessary to keep from disturbing the MOD encoder operation The MOD can handle only one insertion per symbol clk 4 An up down counter is used to keep trac...

Страница 302: ...olomon code word blocks of the last page of the interleave frame When a depth of 8 is programmed the interleaver consists of two pages with each page consisting of 8 Reed Solomon code word blocks Agai...

Страница 303: ...d causes the counter to count down The counter must count down to zero before again entering hunt mode offering some compliance for noise in the system After a locked condition is reached the correlat...

Страница 304: ...ability of the RS decoder If the block is uncorrectable the data is passed through the decoder as received meaning no correction was performed on that block of data The decode Xilinx monitors the CRTN...

Страница 305: ...r The de interleaver operates in much the same manner as the interleaver except it writes scrambled and RS encoded data with check bytes into a static ram in column format and reads in row format The...

Страница 306: ...tional performance 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 REED SOLOMON 1 2 RATE 7 8 RATE Figure A 25 Performance with Noise Viterbi D...

Страница 307: ...SK 1 2 Sequential 2 4 kbps 1 25 Mbps QSPK 1 2 Sequential 4 8 kbps 2 5 Mbps QPSK 3 4 Sequential 7 2 kbps 3 75 Mbps QPSK 7 8 Sequential 8 4 kbps 4 375 Mbps BPSK 1 2 Viterbi Reed Solomon 2 4 kbps 1 138 M...

Страница 308: ...certain options and functionality of the modem Observe the following If the overhead interface PCB is installed at the factory then the 50 pin interface relay card will be pre installed If the overhea...

Страница 309: ...present Failure to do so could result in damage to the modem components 1 Turn off the modem and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pulls slide the main...

Страница 310: ...two field changeable firmware chips If necessary these chips can be removed and new chips added to allow for additional options enhancements or repairs Currently there are no foreseeable requirements...

Страница 311: ...ellite Modem Revision 3 Options MN SLM3650 IOM A 83 FIELD CHANGEABLE CHIPS Figure A 27 Main Board Field Changeable Chips Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www a...

Страница 312: ...ps can be removed and new chips added to allow for additional options enhancements or repairs Currently there are no foreseeable requirements for this task See Figure A 28 for the locations of the fie...

Страница 313: ...Mux PCB can be installed in the factory or in the field This MUX PCB is used in conjunction with a compatible I O card to provide a 100 pin subminiature D style connector located on the rear panel of...

Страница 314: ...r inserting PCBs 1 Turn power off and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pulls slide the main modem assembly out from the rear of the modem chassis 3 Ins...

Страница 315: ...y cycle 10 clock send timing is phase locked to the aggregate clock supplied by the modem Clock stability is based on the reference source The clock accuracy will nominally be 10E 5 when using the mod...

Страница 316: ...IA 422 TX DATA TRIB8 76 TD422A_3 EIA 422 TX DATA TRIB3 27 TC422B_8 EIA 422 TX CLKB TRIB8 77 TC422B_3 EIA 422 TX CLKB TRIB3 28 TC422A_8 EIA 422 TX CLKA TRIB8 78 TC422A_3 EIA 422 TX CLKA TRIB3 29 CTS422...

Страница 317: ...to plug into the base board of the modem at two internal interfaces and provide a single 50 pin D sub connector at the rear of the modem to replace the non overhead 25 pin connector The particular ove...

Страница 318: ...PC Channel AUPC is included to provide remote output power adjustment capability User Channel 3 Auxiliary Data Channel EIA 422 SYNC 0 6 to 4000 kbps EIA 232 ASYNC 0 6 to 64 kbps with CTS flow control...

Страница 319: ...Table A 28 Demultiplexer Specific Specifications Demultiplexer Specific Specifications Tributary Data Interface Synchronous mode The demultiplexer supports synchronous data for each tributary The trib...

Страница 320: ...or inserting PCBs 1 Turn power off and unplug the power supply 2 Remove the rear panel retaining screws Using the finger pulls slide the main modem assembly out from the rear of the modem chassis 3 I...

Страница 321: ...iliary 2 38 DDO B Channel 1 Drop Data Output G 703 Main 5 TXD A Channel 4 ESC Send Data 39 IDI A Channel 1 Insert Data Input G 703 Main 4 TXD B Channel 4 ESC Send Data 40 IDI B Channel 1 Insert Data I...

Страница 322: ...e significantly reduced Furthermore the traditional concatenated RS schemes exhibit a very pronounced threshold effect a small reduction in Eb No can result in total loss of Demod and decoder synchron...

Страница 323: ...erleaving while the TPC cases yield delays which are less than or equal to Sequential decoding A 5 3 Comparison of all TPC Modes Mode Eb No at BER 10 6 Eb No at BER 10 8 Spectral Efficiency Symbol Rat...

Страница 324: ...for comparison purposes Observe that the 8 PSK Rate 3 4 Turbo performance closely approaches that of the Rate 2 3 TCM Reed Solomon case the BER performance is within approximately 0 4 dB However it s...

Страница 325: ...d using serial differential encoding decoding However when No FEC is being used an entirely different scheme must be used Therefore in QPSK a parallel differential encoding decoding technique is used...

Страница 326: ...s rate or 32 ksymbols second One quarter of this equals 8 kHz Therefore the absolute maximum acquisition sweep range which should be considered is 8 kHz If there is any frequency uncertainty on the in...

Страница 327: ...2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 1 2 Coding Uncoded BPSK QPSK Typical Performance Specification limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Specification lim...

Страница 328: ...1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 Eb No in Specificatio limit Rate 1 2 Coding Uncoded Typical Performance Specificatio limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 Specificatio limit Rate 7 8...

Страница 329: ...2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 1 2 Coding Uncoded BPSK QPSK Typical Performance Specification limit Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Specification lim...

Страница 330: ...4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Typical performance Rate 1 2 Coding Uncoded BPSK QPSK Typical performance Rate 3 4 Coding 1 2 3 4 5 6 7 8 9 10 11 12 Typical performance Rate 7...

Страница 331: ...0 200 Outer Code Uncoded BPSK QPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Viterbi with concatenated RS 220 200 Outer Code Combined sync threshold demod and Viterbi Decoder Rate 1 2 Sync threshold Rate 3 4 Spe...

Страница 332: ...Outer Code Uncoded BPSK QPSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Sequential with concatenated RS 220 200 Outer Code 512 kbps Combined sync threshold demod and Sequential Decoder Rate 1 2 Sync threshold Rat...

Страница 333: ...4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Specification limit Rate 2 3 Coding and RS Outer Code Uncoded BPSK QPSK Typical Performance Specification limit Rate 2 3 Coding 1 2 3 4 5 6 7 8...

Страница 334: ...7 1E 6 1E 5 1E 4 1E 3 1E 2 1E 1 1 2 3 4 5 6 7 8 9 10 11 12 Eb No in dB Uncoded BPSK QPSK CEFD Turbo Product Codec Rate 3 4 QPSK OQPSK 8PSK 1 2 3 4 5 6 7 8 9 10 11 12 BER Spec limit Rate 3 4 8 PSK Spe...

Страница 335: ...ormation Interchange ASYNC Asynchronous AUPC Automatic Uplink Power Control BB Baseband bps bits per second BPSK Binary Phase Shift Keying C Celsius CLK Clock COM Common CS Clear to Send CTS Clear to...

Страница 336: ...Maximum Mbps Megabits per second MC Monitor and Control MFS Multiframe Sync MHz Megahertz 106 Hertz Mod Modulator MOP Modulated Output Power MSB Most Significant Bit MUX Multiplexer n nano 10 9 N A No...

Страница 337: ...or Logic TX Transmit Transmitter TXCLK Transmit Clock TXD Transmit Data UB Universal Brreakout box US United States V Volts VAC Volts Alternating Current VCO Voltage Controlled Oscillator VDC Volts Di...

Страница 338: ...SLM 3650 Satellite Modem Revision 3 Glossary MN SLM3650 IOM g 4 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 339: ...n to S N and Eb No Chart 5 4 Comparison of all TPC Modes A 95 Converting Between Bits and Seconds 3 99 D D I G 703 Master Master 3 96 D I Modem Fault A 18 D I Operations 3 82 D I Specification A 8 Dat...

Страница 340: ...Solomon Board and Firmware 2 30 Installation 2 2 INTELSAT Viterbi with Reed Solomon Codec BER 1 18 Interface 4 19 Interface Checkout 5 2 Interface Specification 4 21 L LED Indicators 3 2 Local EIA 23...

Страница 341: ...1 System Faults Alarms 5 8 T Theory of Modulation Types 4 12 Theory of Operation 4 1 4 2 4 11 4 16 Trellis 8 PSK BER 1 26 Typical Spectral Occupancy 1 31 Turbo Products Coding Processing Delay Compar...

Страница 342: ...SLM 3650 Satellite Modem Revision 3 Index MN SLM3650 IOM i 4 This page is intentionally left blank Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 343: ...r 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 002679 0 001 1 oz avoir 28 35 0 9115 0 0625 0 0...

Страница 344: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 345: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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