Page 1 SDM-650B Satellite Modem Installation and Operation Manual Part Number MN/SDM650B.IOM Revision 5...
Page 3 EFData Corporation is an ISO 9001 Registered Company SDM-650B Satellite Modem Installation and Operation Manual Part Number MN/SDM650B.IOM Revision 5 May 28, 1996 Special Instructions: This is the sixth edition of the manual. Change bars were not utilized. This revision supersedes part number MN/SDM650 Rev. 4 dated May 5, 1995.
Page 4: Limitations Of Warranty
Warranty Policy This EFData Corporation product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, EFData will, at its option, repair or replace products that prove to be defective. For equipment under warranty, the customer is responsible for freight to EFData and all related custom, taxes, tariffs, insurance, etc.
Page 5: About This Manual
Preface About this Manual This manual provides installation and operation information for the EFData SDM-650B satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-650B satellite modem.
Page 6 Preface SDM-650B Satellite Modem • Appendix B — describes the unit’s remote control operation protocol and command structure. • Appendix C — provides field compatibility specifications. • Appendix D — provides software change instructions. • Appendix E — describes the unit’s Automatic Gain Control (AGC) interface option.
Page 7: Related Documents
SDM-8000 Satellite Modem Preface References Used in this Manual 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 the unbalanced and balanced voltage digital interface circuits applicable to both long haul and tactical communications.
Page 8 Preface SDM-650B Satellite Modem European EMC Directive In order to meet the European Electro-Magnetic Compatibility (EMC) Directive (EN55022, EN50082-1), properly shielded cables for DATA I/O are required. More specifically, these cables must be double-shielded from end-to-end, ensuring a continuous ground shield.
Page 9: Customer Support
SDM-8000 Satellite Modem Preface Customer Support Contact the EFData Customer Support Department for: • Product support • Information on returning a product • Information on upgrading a product • Product training • Reporting comments or suggestions concerning manuals An EFData Customer Support representative may be reached at: EFData Corporation Attention: Customer Support Department 2105 West 5th Place...
Page 10 Preface SDM-650B Satellite Modem This page is intentionally left blank. Rev. 5...
Page 11: Table Of Contents
Table of Contents CHAPTER 1. INTRODUCTION.................. 1–1 1.1 Purpose and Function ..........................1–2 1.2 Description ..............................1–3 1.3 System Specification.............................1–5 CHAPTER 2. INSTALLATION................... 2–1 2.1 Unpacking ..............................2–1 2.2 External Connections...........................2–2 2.2.1 DATA I/O...............................2–3 2.2.2 Remote (J6).............................2–3 2.2.3 Fault (J7)..............................2–3 2.2.4 IF Output (CP1) ............................2–4 2.2.5 IF Input (CP2)............................2–4 2.2.6 AC Power ...............................2–4 2.2.7 GROUND ...............................2–5...
Page 12 Table of Contents SDM-650B Satellite Modem 3.1.1.7 Utility Defaults ..........................3–5 3.1.2 Remote Interface Specification.......................3–6 3.1.3 M&C Theory of Operation ........................3–6 3.2 Digital Interfaces ............................3–7 3.2.1 RS-422 and MIL-STD-188-114 Interface ....................3–7 3.2.1.1 Functional Description ........................3–7 3.2.1.2 Connector Pinouts .........................3–12 3.2.1.3 Specification..........................3–13 3.2.2 V.35 Interface ............................3–14...
Page 13 SDM-650B Satellite Modem Table of Contents 3.6.1.1.1 Modem Settings (Master).......................3–52 3.6.1.1.2 Modem Settings (Slave)......................3–52 3.6.1.2 Master/Slave G.703 ........................3–53 3.6.1.3 Master/Slave X.21 .........................3–54 3.6.1.3.1 Modem Settings (Master).......................3–54 3.6.1.3.2 Modem Settings (Slave)......................3–54 3.6.1.4 Master/Slave External Station Clock.....................3–55 3.6.1.4.1 Modem Settings (Master).......................3–55 3.6.1.4.2 Modem Settings (Slave)......................3–55 3.6.2 Master/Master ............................3–56...
Page 14 Table of Contents SDM-650B Satellite Modem CHAPTER 6. MAINTENANCE................... 6–1 6.1 System Checkout ............................6–1 6.1.1 Modulator ...............................6–1 6.1.2 Demodulator ............................6–2 6.1.3 Test Points ..............................6–8 6.1.3.1 Modulator ............................6–8 6.1.3.2 Demodulator............................6–9 6.1.3.3 Sequential Decoder/Demod Card ....................6–10 6.2 Fault Isolation.............................6–11 6.2.1 Modulator Faults (Mod_Flts Menu) .....................6–11 6.2.2 Demodulator/Decoder Faults (Dmd_Flts Menu) ..................6–12...
Page 15 SDM-650B Satellite Modem Table of Contents B.1.3.6.3 Select Modulator Rate Variable ..................... B–8 B.1.3.7 Demodulator Rate .......................... B–9 B.1.3.7.1 Demodulator Filter Rate Assignment ..................B–9 B.1.3.7.2 Select Demodulator Rate ...................... B–10 B.1.3.7.3 Select Demodulator Rate Variable ..................B–10 B.1.3.8 Scrambler Enable......................... B–10 B.1.3.9 Descrambler Enable........................
Page 16 Table of Contents SDM-650B Satellite Modem B.1.4.16 Bulk Consolidated Status Faults ....................B–30 B.1.4.17 Change Status ..........................B–31 B.1.4.18 Equipment Type......................... B–32 B.2 Asynchronous Overhead Interface Support Option ................B–33 B.2.1 General ..............................B–33 B.2.2 Message Structure ..........................B–33 B.2.2.1 Start Character ..........................B–34 B.2.2.2 Device Address..........................
Page 17 SDM-650B Satellite Modem Table of Contents B.2.6 System Commands/Responses ......................B–49 B.2.6.1 Time of Day..........................B–49 B.2.6.2 Date.............................. B–50 B.2.6.3 Remote............................B–50 B.2.6.4 Clear Stored Faults ........................B–50 B.2.6.5 Modem Operation Mode......................B–51 B.2.7 Automatic Uplink Power Control (AUPC) Configuration Commands..........B–51 B.2.7.1 Local Modem AUPC Commands ....................
Page 18 APPENDIX C. FIELD COMPATIBILITY ..............C–1 C.1 SDM-650B Standard Modem........................C–1 C.2 SDM-650B Fairchild-Compatible Modem ....................C–2 C.3 SDM-650B Aydin Data Rate Modem ....................... C–2 C.4 SDM-650B Comstream Modem ........................ C–2 APPENDIX D. SOFTWARE CHANGE INSTRUCTIONS...........D–1 APPENDIX E. AGC INTERFACE ................E–1 E.1 Connector Pinouts ............................
Page 19 SDM-650B Satellite Modem Table of Contents F.5.2.3.1 Modulator Faults (Mod_FLTS) .....................F–31 F.5.2.3.2 Demodulator/Decoder Faults (Dmd_Flts) ................F–31 F.5.2.3.3 Common Equipment Faults (CEq_Flts).................F–31 F.5.2.3.4 Transmit Faults (TX_INTF) ....................F–32 F.5.2.3.5 Receive Faults (RX_INTF)....................F–32 F.5.2.4 Select Stored Faults (StFaults) ......................F–33 F.5.2.5 Select Remote..........................F–34 F.5.2.5.1 Remote Configuration......................F–34 F.5.2.5.2 Remote Monitor ........................F–34...
Page 20 Table of Contents SDM-650B Satellite Modem G.6.4.1.3.3 Select Modulator Rate Variable..................G–21 G.6.4.1.3.4 Set Modulator Power Offset ..................G–21 G.6.4.1.3.5 Set Modulator Output Power Level ................G–22 G.6.4.1.3.6 Scrambler Enable ......................G–22 G.6.4.1.3.7 Differential Encoder Enable ..................G–22 G.6.4.2 Demodulator ..........................G–23 G.6.4.2.1 Set Demodulator Frequency....................
Page 21 SDM-650B Satellite Modem Table of Contents G.6.4.5.12.1 Modulator Stored Faults ..................... G–39 G.6.4.5.12.2 Demodulator Stored Faults ..................G–39 G.6.4.5.12.3 Common Equipment Stored Faults ................G–39 G.6.4.5.13 Bulk Consolidated Status ....................G–40 G.6.4.5.14 Bulk Consolidated Analog Status ..................G–42 G.6.4.5.15 Bulk Consolidated Status Faults ..................G–42 G.6.4.5.16 Change Status........................
Page 22 Table of Contents SDM-650B Satellite Modem Figures Figure 1-1. SDM-650B............................1–1 Figure 1-2. Satellite Communications System with an SDM-650B ..............1–2 Figure 1-3. Modular Construction ........................1–4 Figure 1-4. Sequential Decoder BER Performance Curves (1/2 Rate)............1–8 Figure 1-5. Sequential Decoder BER Performance Curves (3/4 Rate)............1–9 Figure 1-6.
Page 23 SDM-650B Satellite Modem Table of Contents Figure E-1. Rear Panel View .......................... E–2 Figure E-2. Wiring Diagram........................... E–4 Figure E-3. AGC Adapter Board ........................E–5 Figure F-1. Asynchronous Overhead Interface Block Diagram ..............F–3 Figure F-2. Asynchronous Overhead Interface Board..................F–5 Figure G-1. Trojan Interface Block Diagram ....................G–2...
Page 24 Table 6-1. EFData Conversion of (S+N)/N to S/N and E for Various Code Rates........6–5 Table 6-2. Programmable Data Rates for the Variable Rate SDM-650B Modem.........6–17 Table 6-3. EFData Part Numbers for SDM-650B Modules................6–22 Table D-1. EFData M&C Viterbi Decoder Firmware ..................D–2 Table F-1.
Page 25: Chapter 1. Introduction
Chapter 1. INTRODUCTION This manual describes the SDM-650B satellite modem, referred to in this document as “the modem” (Figure 1-1). Figure 1-1. SDM-650B Rev. 5 1–1...
Page 26: Purpose And Function
CUSTOMER ENCODER/ TRANSMIT INTERFACE DATA MODULATOR RF EQUIPMENT ANTENNA REMOTE SERIAL MICRO- POWER INTERFACE AC POWER SUPPLY COMPUTER FAULT INDICATORS SDM-650B RECEIVE DEMODULATOR/ SATELLITE DECODER RF EQUIPMENT DATA MODEM Figure 1-2. Satellite Communications System with an SDM-650B 1–2 Rev. 5...
Page 27: Description
SDM-650B Satellite Modem Introduction The modem contains: • Built-in scrambler/descrambler • Differential encoder/decoder • Transmit and receive frequency synthesizers • Multi-rate Forward Error Correction (FEC) convolutional encoder-sequential decoder (Viterbi K=7 is optional) The modem provides high performance with: • Narrow occupied bandwidth •...
Page 28: Figure 1-3. Modular Construction
Introduction SDM-650B Satellite Modem Figure 1-3. Modular Construction Test points are located on the front board edge of the modulator, demodulator, and decoder PCBs. Refer to Section 6.1.4 for listings and diagrams of the test points. All controls and indicators for operation of the modem are located on the front panel. For more information, refer to Chapter 4.
Page 29: System Specification
SDM-650B Satellite Modem Introduction 1.3 System Specification Table 1-1 lists the operating specifications of the modem. Table 1-1. Operating Specifications System Specifications Operating Frequency Range 50 to 90 MHz, or 100 to 180 MHz. Synthesized in 2.5 kHz steps. Type of Modulation QPSK.
Page 30 Introduction SDM-650B Satellite Modem Additional Demodulator Specifications Input Power: Desired Carrier -30 to -55 dBm. Composite +30 dB power within 20 MHz from desired carrier. +40 dB power outside of 20 MHz from desired carrier. 0 dBm maximum composite. Input Impedance Ω...
Page 31: Table 1-2. Ber Performance Specifications
SDM-650B Satellite Modem Introduction The specifications for the Bit Energy-to-Noise Ratio (E ) required to achieve 10 BER for different coding configurations is listed in Table 1-2. All values are for operation in QPSK mode. Table 1-2. BER Performance Specifications...
Page 32: Figure 1-4. Sequential Decoder Ber Performance Curves (1/2 Rate)
Introduction SDM-650B Satellite Modem 100 kbit/s 1544 kbit/s SPECIFICATIONS 10.0 11.0 (dB) Figure 1-4. Sequential Decoder BER Performance Curves (1/2 Rate) 1–8 Rev. 5...
Page 33: Figure 1-5. Sequential Decoder Ber Performance Curves (3/4 Rate)
SDM-650B Satellite Modem Introduction 100 kbit/s 1544 kbit/s SPECIFICATIONS 10.0 11.0 (dB) Figure 1-5. Sequential Decoder BER Performance Curves (3/4 Rate) Rev. 5 1–9...
Page 34: Figure 1-6. Sequential Decoder Ber Performance Curves (7/8 Rate)
Introduction SDM-650B Satellite Modem 1544 kbit/s 100 kbit/s SPECIFICATIONS 10.0 11.0 (dB) Figure 1-6. Sequential Decoder BER Performance Curves (7/8 Rate) 1–10 Rev. 5...
Page 35: Figure 1-7. Viterbi Decoder Ber Performance Curves (1/2 Rate)
SDM-650B Satellite Modem Introduction 100 kbit/s 1544 kbit/s SPECIFICATIONS 10.0 11.0 (dB) Figure 1-7. Viterbi Decoder BER Performance Curves (1/2 Rate) Rev. 5 1–11...
Page 36: Figure 1-8. Sdm-650B Typical Output Spectrum
Introduction SDM-650B Satellite Modem Figure 1-8. SDM-650B Typical Output Spectrum 1–12 Rev. 5...
Page 37: Chapter 2. Installation
Chapter 2. INSTALLATION This chapter provides the following information: • Unpacking instructions • External connections • System requirements • System installation 2.1 Unpacking The modem and manual are packaged in pre-formed, reusable, cardboard cartons containing foam spacing for maximum shipping protection. The three main circuit boards are packed in separate cardboard caddypacks (included within the cardboard carton).
Page 38: External Connections
GROUND I/OI ERDE TX/IF OUTPUT REMOTE FAULT RX/IF INPUT MADE IN USA Figure 2-1. SDM-650B Rear Panel View Table 2-1. Rear Panel Connectors Name Ref. Design. Connector Type Function DATA I/O Various RS-422/MIL-STD-188 I/O V.35 DATA I/O DS1 DATA I/O G.703 DATA I/O...
Page 39: Data I/O
SDM-650B Satellite Modem Installation 2.2.1 DATA I/O For information and pinouts on the data connectors, refer to Chapter 3. 2.2.2 Remote (J6) The remote connector on the modem is used to interface the Monitor and Control (M&C) functions to a remote location. This interface can be either RS-232-C or RS-485. For a complete discussion on the remote interface, refer to Chapter 3.
Page 40: If Output (Cp1)
Installation SDM-650B Satellite Modem The fault interface is provided on a 9-pin female D connector. Screw locks are provided for mechanical security on the mating connector. Pin # Name Function Common equipment is OK Common equipment is faulted Modulator is OK...
Page 41: Ground
SDM-650B Satellite Modem Installation 2.2.7 GROUND A #10-32 stud is available on the rear panel for the purpose of connecting a common chassis ground between all of the equipment. 2.3 System Requirements The standard modem with all cards installed (as listed in Chapter 1) is a full-duplex QPSK satellite modem.
Page 42: System Installation
Installation SDM-650B Satellite Modem 2.4 System Installation After unpacking, install the modem as follows: 1. Mount the modem chassis in its assigned position in the equipment rack. 2. Connect the cables to the rear panel in the appropriate locations. Refer to Section 2.2 for connector pinouts, placement, and functions.
Page 43: Chapter 3. Configuration
Chapter 3. CONFIGURATION This chapter provides the following information: • Monitor and control • Digital interfaces • Doppler buffer assembly • Doppler buffer specification • I/O connectors • Interface clocking options 3.1 Monitor and Control The modem uses a sophisticated microcontroller module to perform the M&C functions of the modem (refer to Figure 3-1).
Page 44: Description Of Options
Configuration SDM-650B Satellite Modem Figure 3-1. M&C Card 3.1.1 Description of Options 3.1.1.1 Remote Interface All modem functions can be remotely controlled and monitored via an RS-485 (optional RS-232-C) communications link. • The 2-wire, half-duplex RS-485 interface makes it possible to operate 255 modems on a common communications link.
Page 45: Remote Baud Rate
SDM-650B Satellite Modem Configuration 3.1.1.2 Remote Baud Rate The remote communications baud rate and parity are programmed by a switch pack (SP1) on the M&C module. Programming the baud rate and parity is accomplished by setting the appropriate switches in the OFF or ON positions: •...
Page 46: Remote Address
Configuration SDM-650B Satellite Modem 3.1.1.3 Remote Address Each modem must be configured for a distinct address between 1 and 255 to communicate using the established remote communications protocol. Addresses are programmed by a switch pack (SP2) on the M&C module.
Page 47: Modulator/Coder Defaults
SDM-650B Satellite Modem Configuration 3.1.1.5 Modulator/Coder Defaults Transmit Filter A — 7/8 code rate, 56 kbit/s Transmit Filter B — 3/4 code rate, 56 kbit/s Transmit Filter C — 1/2 code rate, 56 kbit/s Transmit Filter D — 1/2 code rate, 64 kbit/s Transmit Rate Selected —...
Page 48: Remote Interface Specification
Configuration SDM-650B Satellite Modem 3.1.2 Remote Interface Specification Refer to Appendix B for remote control operation information. 3.1.3 M&C Theory of Operation The M&C module is built around the Intel 80C31 microcontroller operating at 5.5295 MHz. The microsystem is designed to support: •...
Page 49: Digital Interfaces
SDM-650B Satellite Modem Configuration 3.2 Digital Interfaces 3.2.1 RS-422 and MIL-STD-188-114 Interface 3.2.1.1 Functional Description The RS-422 and MIL-STD-188-114 digital interface (Figure 3-2) provides the level translation, buffering, and termination between the internal modem signals and the RS-422 or MIL-STD-188-114 interface connector on the rear panel. A functional block diagram of the interface is shown in Figure 3-3.
Page 50: Figure 3-3. Rs-422 And Mil-Std-188-114 Block Diagram
Configuration SDM-650B Satellite Modem Electrical characteristics of the RS-422 interface signals are defined in EIA-STD-RS-422. Electrical characteristics of the MIL-STD-188-114 interface signals are defined in MIL-STD-188-114 and MIL-STD-188-100. • EIA-STD-RS-449 provides details of the mechanical interface. • MIL-STD-188-114 defines signal levels, offsets, termination resistors, etc.
Page 51 SDM-650B Satellite Modem Configuration The RS-422 and MIL-STD-188-114 interface provides a Send Timing (ST) clock signal at the modem data rate. In the Internal Clock mode, the data to be transmitted, Send Data (SD), must be synchronized to ST. In the External Clock mode, the clock is accepted on the Terminal Timing (TT) input to clock in the data to be transmitted.
Page 52 Configuration SDM-650B Satellite Modem Loop timing is supported by the selection of jumper JP10. When in the ON position, the transmit clock (ST) is replaced by the clock recovered from the satellite (RT). Active loop timing is indicated by a yellow light on the front edge of the card. The JP10 REM setting is for future options.
Page 53: Table 3-1. As/0627-3 Rev. E Board Jumper Selection
SDM-650B Satellite Modem Configuration Table 3-1. AS/0627-3 Rev. E Board Jumper Selection TX Clock Select Normal Invert Auto Interface Select V.35 (-2) MIL-STD-188/RS-232-C (-3) (See Note Below) RX Data Normal (See Note Below) Buffer RX Clock Normal (See Note Below)
Page 54: Connector Pinouts
Configuration SDM-650B Satellite Modem 3.2.1.2 Connector Pinouts The RS-422 and MIL-STD-188-114 interface is provided on a 37-pin female D connector, accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector. Signal Function...
Page 55: Specification
SDM-650B Satellite Modem Configuration 3.2.1.3 Specification Circuit Supported SD, ST, TT, RD, RT, DM, RR, MOD, FAULT, DEMOD FAULT, MC. Amplitude (RD, RT, ST, DM, RR) ± 2V differential into 100 Ω DC Offset (RD, RT, ST, DM, RR) ±...
Page 56: Interface
Configuration SDM-650B Satellite Modem 3.2.2 V.35 Interface 3.2.2.1 Functional Description The V.35 digital interface (Figure 3-4) provides level translation, buffering, and termination between the internal modem signals and the V.35 DCE interface connector on the rear panel. Electrical characteristics of the interface signals are defined in CCITT Recommendation V.35.
Page 57: Figure 3-5. V.35 Interface Block Diagram
SDM-650B Satellite Modem Configuration LOOP TIMING TO BUFFER TO LOGIC CONTROL OPTIONS INT/EXT CLOCK TO CONTROL LOGIC LOOPBACK TO CONTROL LOGIC TX CLOCK AUTO CLOCK SELECT TX DATA RX CLOCK INVERT NORM RX DATA EXTERNAL BUFFER CLOCK TO BUFFER OPTIONS...
Page 58 Configuration SDM-650B Satellite Modem Data received by the modem is output on the RD lines, while the recovered clock is output on the Serial Clock Receive (SCR) lines. For applications that require the rising edge of the clock to occur in the middle of the data bit time, Receive Clock Normal mode should be selected.
Page 59: Table 3-2. As/0627-2 Rev. E Board Jumper Selection
SDM-650B Satellite Modem Configuration Table 3-2 lists the jumper settings for the V.35 interface. These jumpers are factory set for a specific configuration. Clock selections, signal selections, and loop timing can be changed upon individual needs. Table 3-2. AS/0627-2 Rev. E Board Jumper Selection...
Page 60: Connector Pinouts
Configuration SDM-650B Satellite Modem 3.2.2.2 Connector Pinouts The V.35 interface is provided on the industry standard 34-pin block connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector. Signal Function...
Page 61: Specification
SDM-650B Satellite Modem Configuration 3.2.2.3 Specification Circuit Supported SD, SCT, SCTE, RD, SCR, DSR, RLSD, MOD, FAULT, DEMOD FAULT, MC. Amplitude (RD, SCR, SCT, SD, SCTE) 0.55V pk, ± 20% differential, into 100 Ω 5V into 5000, ± 2000 Amplitude (CTS, DSR, RLSD) ±...
Page 62: Interface
Configuration SDM-650B Satellite Modem 3.2.3 DS-1 Interface 3.2.3.1 Functional Description The DS-1 digital interface (Figure 3-6) provides level translation, buffering, and termination between the internal modem signals and the DS-1 DTE interface on the rear panel. SWITCH 1 Figure 3-6. DS-1 Interface Card The DS-1 standard is defined in Bell System Publication 62411.
Page 63: Figure 3-7. Ds-1 Interface Block Diagram
SDM-650B Satellite Modem Configuration TO BUFFER OPTIONS DS-1 LINE RECEIVER/DRIVER TX CLOCK DS-1 DEJITTER TX DATA LOOPBACK CONTROL RX CLOCK RX DATA EXTERNAL BUFFER CLOCK TO BUFFER OPTIONS COMMON EQUIPMENT FAULT MODULATOR RELAYS CONTROL LOGIC DEMODULATOR TTL MODULATOR FAULT TTL DEMODULATOR FAULT DATA BUS TO M &...
Page 64: Table 3-3. Equalizer Control
Configuration SDM-650B Satellite Modem Table 3-3. Equalizer Control Distance to DSX (Ft) (See Note 2) (See Note 1) (applies only to Maximum Cable 22–GA. PIC Loss [ABAM] Cable) (dB at 772 kHz) 0 to 133 133 to 267 167 to 400...
Page 65: Connector Pinouts
SDM-650B Satellite Modem Configuration 3.2.3.2 Connector Pinouts The DS-1 interface is provided on a 15-pin female D connector accessible from the modem rear panel. Screw locks are provided for mechanical security of the mating connector. Signal Function Name Pin #...
Page 66: G.703, 2048 Kbit/S Interface
Configuration SDM-650B Satellite Modem 3.2.4 G.703, 2048 kbit/s Interface 3.2.4.1 Functional Description The G.703 2048 kbit/s digital interface (Figure 3-8) provides level translation, buffering, and termination between the internal modem signals and the G.703 DTE interface on the rear panel.
Page 67: Figure 3-9. G.703 2048 Interface Block Diagram
SDM-650B Satellite Modem Configuration N X 64 KB TO BUFFER CLOCK OPTIONS SYNTHESIZER TX CLOCK DS-1 DS-1 LINE DEJITTER RECEIVER/ TX DATA DRIVER LOOPBACK CONTROL RX CLOCK RX DATA EXTERNAL BUFFER CLOCK TO BUFFER OPTIONS COMMON EQUIPMENT FAULT MODULATOR RELAYS...
Page 68: Optional Ext Clk
Configuration SDM-650B Satellite Modem They are available on the FAULT connector on the modem rear panel. Generation of these fault conditions is described in Chapter 4. Table 3-4. G.703, 2048 kbit/s Interface Switch Configurations SW1 Positions Function Selected AMI CODE...
Page 69: Switch Configuration For G.703 2048 Kbit/S Interface
SDM-650B Satellite Modem Configuration 3.2.4.3 Switch Configuration for G.703 2048 kbit/s Interface Switch 1 is an 8-position dip switch located at the end of the G.703 interface board. Table 3-4 lists the switch settings for data rates and available coding for the G.703 2048 kbit/s interface.
Page 70: 2048 Kbit/S Connector Board Option
Configuration SDM-650B Satellite Modem 3.2.4.5 G.703 2048 kbit/s Connector Board Option The G.703 2048 kbit/s interface has a connector board option that is configured with a 15-pin D and three BNCs for unbalanced signals for SD, RD, and MC (Figure 3-10).
Page 71: Figure 3-11. G.703 2048 Kbit/S Connector Board Schematic Diagram
SDM-650B Satellite Modem Configuration Table 3-5. G.703 2048 kbit/s Interface Connector Jumpers Switch J3 (EXT REF) J4 (SEND DATA) J5 (RECEIVE DATA) UNBAL UNBAL UNBAL SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 Switch Positions CLOSED OPEN DON’T CARE The interface connects to the rear of the modem, directly onto the G.703 interface connector.
Page 72: External Reference (J3)
Configuration SDM-650B Satellite Modem The G.703 2048 kbit/s optional connector board provides the balanced signals on a 15-pin female D connector. These signals are the same as the G.703 interface connector. Refer to Section 3.2.4.4 for the connector pinouts. The unbalanced signals are accessible from J3, J4, and J5. A description of available unbalanced signals and directions is described in the following paragraphs.
Page 73: Specification
SDM-650B Satellite Modem Configuration 3.2.4.9 Specification Pairs Symmetrical pair, coaxial pair optional. Circuits Supported SD, RD, MOD FAULT, DEMOD FAULT. Data Rate 2.048 Mbit/s, ± 50 PPM. Pulse Width (RD) 244, ± 25 ns. Line Code AMI or HDB3 (selectable).
Page 74: Terrestrial Interface
Configuration SDM-650B Satellite Modem RECEIVE SECTION TRANSMIT SECTION FRAMING/ RS-232 TIMING ES TO ES ASYNC LOGIC (MUX) MODEM INTERFACE LPBK LPBK DEFRAME/TIMING RS-232 LOGIC (DEMUX) INTERFACE ES TO ES ASYNC TX DEJITTER T1/E1 T2/E2 G.703 INTERFACE BASE PLESIOCHRONOUS BAND BUFFER...
Page 75: Figure 3-13. Asynchronous Overhead Jumpers
SDM-650B Satellite Modem Configuration The “handshake” asynchronous signals are: • • • • • • RLSD This board may otherwise contain the circuitry for transformer balanced data interfaces supporting CCITT G.703 parameters. Data inputs are SD, and outputs are RD. Data rates of 1.544, 2.048, 6.312, and 8.448 Mbit/s are supported.
Page 76: Table 3-6. Asynchronous Overhead Jumper Table
Configuration SDM-650B Satellite Modem Table 3-6. Asynchronous Overhead Jumper Table JP # Pin # Function 1 to 3, and 2 to 4 V.35, RS-422, MIL-STD-188 3 to 5, and 4 to 6 G.703 1 to 2 Auto TX CLK Phase Select...
Page 77: Multiplexer
SDM-650B Satellite Modem Configuration 3.2.5.3 Multiplexer The data processor, AS/1289, forms the bottom of the 2-board module. This board contains the data multiplexer and demultiplexer. The synchronous data stream is multiplexed with a 1/15 overhead channel, and the resultant information is interfaced to the modulator/coder section of the modem.
Page 78: Plesiochronous Buffer
Configuration SDM-650B Satellite Modem 3.2.5.5 Plesiochronous Buffer User data from the DEMUX section is fed into a plesiochronous buffer. The buffer size is user selectable in 16-bit increments, from 384 to 262144 bits. The buffer is automatically centered on resumption of service after an outage, or may be commanded to center in the interface configuration section (from the front panel or remotely).
Page 79: Interface Connector Pinouts
SDM-650B Satellite Modem Configuration 3.2.5.7 Interface Connector Pinouts The asynchronous interface is provided on a 50-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector. Signal Function...
Page 80: Asynchronous Interface Specifications
Configuration SDM-650B Satellite Modem 3.2.5.8 Asynchronous Interface Specifications Main Channel Physical Interface MIL-STD-188-114. (Factory Option) RS-422/-449. V.35. G.703. Data Rates 9.6K, 19.2K, 32 kbit/s to 8.448 Mbit/s. G.703 Data Rates 1.544 Mbit/s. (Jumper Selectable) 2.048 Mbit/s. 6.312 Mbit/s. 8.448 Mbit/s.
Page 81: Asynchronous Breakout Panel
SDM-650B Satellite Modem Configuration 3.2.6 Asynchronous Breakout Panel The asynchronous breakout panel supports the use of the asynchronous interface in the modem. For more information, refer to the ASYNC Breakout Panel Installation and Operation Manual. Rev. 5 3–39...
Page 82: Doppler Buffer
Configuration SDM-650B Satellite Modem 3.3 Doppler Buffer The Doppler buffer assembly is an option that plugs on to the modem interfaces, that provides elastic buffering to the receive data channel. The Doppler buffer compensates for the effect of satellite movement or disparity between transmit and receive clocks, and can be used at data rates of 9.6 kbit/s to 2.5 Mbit/s.
Page 83: Table 3-8. Jumper Selections
SDM-650B Satellite Modem Configuration Table 3-8. Jumper Selections Function Install Remove Clock Source Control By M&C JP8, JP9 JP10, JP11 Clock Source Receive (Bypass) JP11 JP8, JP8, JP10 Clock Source Transmit CLK JP10, JP11 JP8, JP9 Clock Source External JP10 JP8, JP9, JP11 Center Control By M&C...
Page 84 Configuration SDM-650B Satellite Modem The formula for calculating the buffer depth is: Buffer Depth (bits) = Bit Rate (bit/s) x Max. Delay Variation Contact the satellite company to determine the delay variation of a particular domestic satellite. The buffer depth capacity can be set either through the M&C or manually with a DIP switch on the buffer.
Page 85: Figure 3-14. As/3812 Doppler Buffer Daughter Card
SDM-650B Satellite Modem Configuration Figure 3-14. AS/3812 Doppler Buffer Daughter Card Pinouts on the 34-pin V.35 are: • “c” for MC-A • “d” for MC-B The pinouts on the 37-pin connector are: • Pin 16 for MC-A • Pin 34 for MC-B The electrical configuration of these lines is the RS-422.
Page 86: Buffer Setup
Configuration SDM-650B Satellite Modem 3.3.1 Buffer Setup The receive buffer allows for: • Plesiochronous buffering of two dissimilar clock frequencies: the far end transmit clock and the local network clock frequency. The clocks may be very close in frequency to each other and will normally slip at a constant rate. Figure 3-15 shows plesiochronous operation of dissimilar clocks.
Page 87: Figure 3-15. Clock Slip Diagram
SDM-650B Satellite Modem Configuration F1 is not EXACTLY equal to f2. Plesiochronous Operation Too Fast Too Slow Bit 1 Bit 1 Bit 1 Bit 1 Bit 2 Bit 2 Bit 2 Bit 2 Error Error Bit 3 Bit 3 Bit 3...
Page 88: Buffer Size
Configuration SDM-650B Satellite Modem 3.3.1.1 Buffer Size The depth of the receive buffer will depend upon four parameters: • Doppler shift caused by satellite • Stability of each clock (plesiochronous/Doppler operation only) • Frame/multiframe length of multiplexed data format •...
Page 89: Plesiochronous
SDM-650B Satellite Modem Configuration 3.3.1.3 Plesiochronous The stability of station reference clocks is normally 10 that is derived from a cesium standard. When the stability is exceptionally high, the two clocks are not in sync with each other. Eventually, the two reference clocks will pass by each other.
Page 90: Total Buffer Length
Configuration SDM-650B Satellite Modem 3.3.1.5 Total Buffer Length The size of the buffer will be determined by the Doppler, plesiochronous, and the frame and multiframe length (the last three sections). Using the three examples given in the last three sections, the total buffer depth (end to end) will be: Doppler + Plesiochronous ms (rounded up to the nearest multiframe) (e.g., 1.15 + 6.98 = 8.13 ms)
Page 91: Doppler Buffer Specification
SDM-650B Satellite Modem Configuration 3.4 Doppler Buffer Specification Buffer Size (bits) 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 Clock Source Receive, transmit, and external clock 9.6 kbit/s to 2.4 Mbit/s Data Rate Indicators Buffer overflow (latched) Buffer underflow (latched)
Page 92: Interface Clocking Options
Configuration SDM-650B Satellite Modem 3.6 Interface Clocking Options Clocking of the data from the terrestrial circuits to the satellite, and vice versa, will depend upon the application. The most common options and recommended configurations are described in the following sections.
Page 93: Figure 3-16. Rs-422 Or V.35 Master Slave Configuration
SDM-650B Satellite Modem Configuration 3.6.1.1 Master/Slave RS-422 or V.35 Refer to Figure 3-16 for the RS-422 or V.35 master/slave configuration. Figure 3-16. RS-422 or V.35 Master Slave Configuration Notes: 1. The clock may be looped back by using JP10 on the interface board.
Page 94: Modem Settings (Master)
Configuration SDM-650B Satellite Modem 3.6.1.1.1 Modem Settings (Master) 1. TX-CLOCK: EXT. 2. Install JP10 and JP11 on buffer card (AS/3812). 3. Set S3 as required. Refer to Table 3-9. 3.6.1.1.2 Modem Settings (Slave) 1. TX-CLOCK: EXT. 2. Set S3 to minimum size, and install JP11 on buffer card (AS/3812). Refer to Table 3-9.
Page 95: Master/Slave G.703
SDM-650B Satellite Modem Configuration 3.6.1.2 Master/Slave G.703 Refer to Figure 3-17 for the G.703 master/slave configuration. Note: There is no loop timing selection on board for G.703. It is assumed that any G.703 termination equipment will extract the clock from the satellite signal, and turn it around for re-transmitting.
Page 96: Master/Slave X.21
Configuration SDM-650B Satellite Modem 3.6.1.3 Master/Slave X.21 Refer to Figure 3-18 for the X.21 master/slave configuration. Figure 3-18. X.21 Master/Slave Configuration Note: On Rev. E boards, there are on-board jumpers to loop back the clock. Refer to Table 3-1 (see the note in the previous example).
Page 97: Master/Slave External Station Clock
SDM-650B Satellite Modem Configuration 3.6.1.4 Master/Slave External Station Clock Figure 3-19 shows the master/slave external station clock configuration diagram. Note: Clock must be looped externally at slave end. (For RS-422 and V.35, see the note in the previous example.) Figure 3-19. G.703 Master Slave Configuration 3.6.1.4.1 Modem Settings (Master)
Page 98: Master/Master
Configuration SDM-650B Satellite Modem 3.6.2 Master/Master This application is used where both earth stations have high stability clocks available, and the received data is to be clocked onto the local network. The disadvantage of the master/master application is that the receive data will slip, as the clocks will not be synchronized.
Page 99: Modem Settings (Master)
SDM-650B Satellite Modem Configuration 3.6.2.1.1 Modem Settings (Master) • TX-CLOCK: EXT. • Install JP10 and JP11 on buffer card (AS/3812). • Set S3 as required. Refer to Table 3-9. Rev. 5 3–57...
Page 100: Master/Master (Station Clock)
Configuration SDM-650B Satellite Modem 3.6.2.2 Master/Master (Station Clock) Care should be taken when using this mode. Make sure that the station clock is also used to synchronize the transmit data. Phasing problems may also occur between the transmit data and the station clock input. For this reason, it is better to use the TERR clock on transmit.
Page 101: Modem Settings (Master)
SDM-650B Satellite Modem Configuration 3.6.2.2.1 Modem Settings (Master) • TX-CLOCK: EXT. • Install JP1 and JP10 on buffer card (AS/3812). • Set S3 as required: If using the G.703 2048 kbit/s interface (AS/0679), set SW1-6 and SW1-7 to open, and the remainder to closed.
Page 102 Configuration SDM-650B Satellite Modem This page is intentionally left blank. 3–60 Rev. 5...
Page 103: Chapter 4. Operation
Chapter 4. OPERATION This chapter provides front panel operation information for the standard SDM-650B modem. The following firmware version is described: • Firmware number: FW/0713-35R • Software version: 4.16 Notes: 1. For front panel operation information for the modem with the asynchronous overhead channel unit installed, refer to Appendix F.
Page 104: Front Panel
The modem front panel (Figure 4-1) provides the local user interface, which is necessary to configure and monitor the modem status. Figure 4-1. SDM-650B Front Panel View The front panel features a 16-character, 2-line LCD display, and 6-key keypad that provides sophisticated functions, yet is easy to use.
Page 105: Led Indicators
SDM-650B Satellite Modem Operation 4.1.1 LED Indicators General modem status and summary fault information are indicated by eight LEDs on the front panel. The indicators are defined as follows: Faults Color Description Transmit Red LED Indicates that a modulator fault condition exists.
Page 106: Menus And Options Overview
Operation SDM-650B Satellite Modem The modem responds by beeping whenever a key is pressed. • A single beep indicates that the key pressed was a valid entry, and the appropriate action was taken. • A double beep when a key is pressed indicates an invalid entry.
Page 107: Table 4-2. Select Configuration Menu
SDM-650B Satellite Modem Operation Table 4-2. Select Configuration Menu Menus Submenus/Options Comments TX-x Code Rate x = A, B, C, D, or V RX-x Code Rate x = A, B, C, D, or V TX_Freq 50.0000 to 90.0000 MHz In 2.5 kHz steps.
Page 108: Table 4-3. Select Monitor Menu
Operation SDM-650B Satellite Modem Table 4-3. Select Monitor Menu Menus Submenus/Options Comments Raw_BER Range: < 1.0E-4 to 2549E-4 Corr_BER Range: > 1E-8 to > 1E-3 Eb/N0 Range: < 3.2 dB to > 9.7 dB SWP_FREQ Range: -25000 to +25000 Hz...
Page 109: Table 4-5. Select Stored Faults (Stfaults) Menu
SDM-650B Satellite Modem Operation Table 4-5. Select Stored Faults (StFaults) Menu Menus Submenus/Options Comments Mod_Flt0 through Mod_Flt9 RF_Syn Data_Clk MM/DD/YY TClk_Syn HH/MM/SS I-Channl Q-Channl AGC_levl Module Dmd_Flt0 through Dmd_Flt9 C_Detect RF_Syn MM/DD/YY Data_Clk HH/MM/SS I-Channl Q-Channl Dscrambl BERthrsh Module CEq_Flt0 through CEq_Flt9...
Page 110: Table 4-6. Select Utility Menu
Operation SDM-650B Satellite Modem Table 4-6. Select Utility Menu Menus Submenus/Options Comments Time Seconds (SS) reset at [ENTER]. HH:MM AM/PM Date MM/DD/YY LAMP TEST?? Press [ENTER] to illuminate all front panel LEDs for three seconds. Address = 0 to 255...
Page 111: Menu Explanations
SDM-650B Satellite Modem Operation 4.1.4 Menu Explanations Modem configuration may be viewed or changed by entering the Config level from the Select menu on the front panel. 4.1.4.1 Select Configuration Refer to Table 4-2. Once the Config menu is entered, the configuration status of all parameters can be viewed by using .
Page 112 Operation SDM-650B Satellite Modem TX_Freq Programs the modulator transmit frequency between 50 and 90 MHz, or between 100 and 180 MHz, in 2.5 kHz steps. On entry, the current transmitter frequency is displayed with the flashing cursor on the first character. Use [ ←...
Page 113 SDM-650B Satellite Modem Operation BBLoopBk Programs the modem for baseband loopback operation. (Test Mode Configuration When baseband loopback is turned ON, the data and timing signals are Option) hard-wired (relays) from the demodulator to the modulator. The DTE baseband signals are also looped back from transmitter data and clock, to receiver data and clock.
Page 114 Operation SDM-650B Satellite Modem SWP_CNTR Note: This window is only displayed when Fast Acquisition has been turned ON in the Utility menu. Programs the sweep center frequency for the directed sweep function. The sweep center frequency may be set in the range from +25000 to -25000 Hz.
Page 115 SDM-650B Satellite Modem Operation CW_Mode Programs the modem for continuous wave mode. Three modes of operation are available: (Test Mode Configuration Option) • Center • Dual • Offset Center Mode: Generates carrier at the current modulator frequency. This can be used to measure the output frequency.
Page 116 Operation SDM-650B Satellite Modem BUF_clk Programs the plesiochronous buffer output clock for: • External • Satellite • Internal • Ext_Ref External Mode: When this mode is selected and no clock is present at the rear of the modem, the clock will fallback to the satellite clock. The Satellite mode sets the output buffer clock to the satellite clock, which is also the fallback clock.
Page 117: Select Monitor
SDM-650B Satellite Modem Operation 4.1.4.2 Select Monitor Refer to Table 4-3. When the Monitor level is entered, use to select the desired monitor function. ← → Each monitor function is displayed in real time as long as it is selected.
Page 118: Select Faults
Operation SDM-650B Satellite Modem 4.1.4.3 Select Faults Refer to Table 4-4. The Faults level is accessible from the Select menu. Faults are similar to monitor functions, they display the current fault status of the group being displayed. to move between the fault groups: ←...
Page 119: Modulator Faults (Mod_Flts)
SDM-650B Satellite Modem Operation 4.1.4.3.1 Modulator Faults (Mod_Flts) RF_Syn Modulator RF synthesizer fault. Data Clk Transmit data clock activity fault. TClk Syn Transmit clock synthesizer fault. I-Channl I channel activity fault. Q-Channl Q channel activity fault. AGC_levl Automatic gain control level fault.
Page 120: Select Stored Faults (Stfaults)
Operation SDM-650B Satellite Modem 4.1.4.4 Select Stored Faults (StFaults) Refer to Table 4-5. The modem stores the first 10 (Flt0 to Flt9) occurrences of fault status changes in each of the three major fault categories. Each stored fault status change is also stored with the time and date of the occurrence.
Page 121: Select Utility
SDM-650B Satellite Modem Operation 4.1.4.5 Select Utility Refer to Table 4-6. For additional information, refer to Section A.2. Utility functions allows the user to: • Set the time and date of the modem real time clock • Perform a front panel lamp test •...
Page 122 Operation SDM-650B Satellite Modem POW ADJ Modulator power adjust offset. Allows the user to offset the modulator output power readout in the Config menu. This will be the highest modulator power that will be displayed and programmed. This feature does not actually change the modulator power level.
Page 123 SDM-650B Satellite Modem Operation Assign TX_Fltrs Modulator symbol rate assignment. This function is used to view current filter rate assignments, and to make filter rate re-assignments. The modulator has four symbol rate filters. Filters are designated as A, B, C, and D. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
Page 124 Operation SDM-650B Satellite Modem Assign RX_Fltrs Demodulator symbol rate assignment. This function is used to view current filter rate assignments, and to make filter rate re-assignments. The demodulator has four symbol rate filters. Filters are designated as A, B, C, and D. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial demodulator installation, and when circumstances indicate the need to do so.
Page 125: Chapter 5. Theory Of Operation
Chapter 5. THEORY OF OPERATION This chapter contains information on the following cards: • Modulator • Sequential decoder/demodulator processor • Demodulator In addition, information is provided on reacquisition, fast acquisition, and the directed sweep mode. 5.1 Modulator The modem modulator card is a 10.25” x 14” card that fits in the top-left slot of the modem chassis.
Page 126: Figure 5-1. Modulator Block Diagram
Theory of Operation SDM-650B Satellite Modem A block diagram of the modulator is shown in Figure 5-1. FORWARD ERROR INPUT DATA DIFFERENTIAL I CHANNEL CORRECTION NYQUIST FILTERS DATA SCRAMBLER ENCODER ENCODER POWER COMBINER INPUT Q CHANNEL CLOCK CLOCK NYQUIST FILTERS...
Page 127: Specifications
SDM-650B Satellite Modem Theory of Operation 5.1.1 Specifications Modulation Type QPSK (BPSK optional) Frequency Range 50 to 90 MHz, or 100 to 180 MHz Frequency Select Method Synthesized Frequency Step Size 2.5 kHz Frequency Stability 10 PPM Channel Spacing 0.7 times the data rate divided by the encoding rate Phase Error 2.5°...
Page 128: Figure 5-2. Modulator Output Spectral Occupancy
Theory of Operation SDM-650B Satellite Modem Figure 5-2. Modulator Output Spectral Occupancy 5–4 Rev. 6...
Page 129: Theory Of Operation
SDM-650B Satellite Modem Theory of Operation 5.1.2 Theory of Operation Data that is to be transmitted is input to the digital interface of the modulator. The format is RS-422, and includes a clock synchronous with the data. The data at this point is clean and dejittered.
Page 130 Theory of Operation SDM-650B Satellite Modem For example, the rate of the encoder at 7/8 rate means 8 bits are output for every 7 bits input. If the modulator is in the QPSK mode, the data is split into two separate data streams to drive the in-phase and quadrature channels of the modulator.
Page 131: Sequential Decoder/Demodulator Processor
SDM-650B Satellite Modem Theory of Operation 5.2 Sequential Decoder/Demodulator Processor The modem sequential decoder/demodulator processor is a 10.25” x 14” card that fits in the middle-left slot of the modem chassis. The card performs five separate functions: • Contains the digital Costas processor which provides signals to the demodulator board for carrier recovery and Automatic Gain Control (AGC) •...
Page 132: Specification
Theory of Operation SDM-650B Satellite Modem 5.2.1 Specification Demodulator Processor Operating Symbol Rate Range 32 Ks/s to 2048 Ks/s Operating Code Rate Range 7/8, 3/4, 1/2 Input Signal 11 Level Quantized I and Q Output Signals VCXO Drive, AGC Drive, I sign, I mag,...
Page 133: Theory Of Operation
SDM-650B Satellite Modem Theory of Operation 5.2.2 Theory of Operation 5.2.2.1 Demodulator Processor The demodulator processor, in conjunction with the demodulator, reconstructs the digital data stream that was transmitted but corrupted by transmission channel impairments. The demodulator processor accepts 11-bit quantized signals from the demodulator for both the I and Q channels.
Page 134: Sequential Decoder
Theory of Operation SDM-650B Satellite Modem 5.2.2.2 Sequential Decoder The sequential decoder works in conjunction with the convolutional encoder at the transmitting modem to correct bit errors in the received data stream from the demodulator. The sequential decoder processes 2-bit quantized, I and Q channel data symbols from the demodulator.
Page 135 SDM-650B Satellite Modem Theory of Operation The input RAM buffers the data to provide history for the backwards searches. Data from the RAM passes through the ambiguity corrector, which compensates for the potential 90° phase ambiguity of the demodulator. The syndrome input generator converts the 2-bit soft decision data into a single bit per channel, and simultaneously corrects some isolated bit errors.
Page 136: Sequential Decoder Ber Performance Specifications
Theory of Operation SDM-650B Satellite Modem 5.2.2.2.1 Sequential Decoder BER Performance Specifications The guaranteed BER performance curves for the sequential decoder are shown in Figures 1-4 through 1-6. The specifications are based on 1/2, 3/4, and 7/8 rates at 100 and 1544 kbit/s.
Page 137: Figure 5-4. Sequential Decoder Ber Performance Curves (1/2 Rate)
SDM-650B Satellite Modem Theory of Operation 56 kbit/s 1544 kbit/s THEORETICAL 10.0 11.0 (dB) Figure 5-4. Sequential Decoder BER Performance Curves (1/2 Rate) Rev. 6 5–13...
Page 138: Figure 5-5. Sequential Decoder Ber Performance Curves (3/4 Rate)
Theory of Operation SDM-650B Satellite Modem 56 kbit/s 1544 kbit/s THEORETICAL 10.0 11.0 (dB) Figure 5-5. Sequential Decoder BER Performance Curves (3/4 Rate) 5–14 Rev. 6...
Page 139: Figure 5-6. Sequential Decoder Ber Performance Curves (7/8 Rate)
SDM-650B Satellite Modem Theory of Operation 1544 kbit/s 56 kbit/s THEORETICAL 10.0 11.0 (dB) Figure 5-6. Sequential Decoder BER Performance Curves (7/8 Rate) Rev. 6 5–15...
Page 140: Demodulator
Theory of Operation SDM-650B Satellite Modem 5.3 Demodulator The modem demodulator card is a 10.25” x 14” card that fits in the lower-left slot of the modem chassis. The demodulator’s function is to accept a desired QPSK or BPSK modulated signal in the 50 to 90 MHz, or 100 to 180 MHz range.
Page 141: Specifications
SDM-650B Satellite Modem Theory of Operation 5.3.1 Specifications Demodulation Type QPSK (BPSK optional) Frequency Range 50 to 90 MHz, or 100 to 180 MHz Frequency Select Method Synthesized Frequency Step Size 2.5 kHz Channel Spacing 0.7 times the data rate divided by the encoding rate...
Page 142: Reacquisition, Fast Acquisition, And Directed Sweep
Theory of Operation SDM-650B Satellite Modem 5.4 Reacquisition, Fast Acquisition, and Directed Sweep The fast acquisition algorithm has been permanently installed in the current version of the modem software. The carrier should be acquired within 30 seconds, regardless of the symbol rate.
Page 143: Fast Acquisition
SDM-650B Satellite Modem Theory of Operation The reacquisition mode is intended to reduce the time for reacquisition at lower symbol rates. The following guidelines should be applied when using the reacquisition mode: • The time specified for reacquisition must be multiples of 10% of the total nominal sweep time.
Page 144: Directed Sweep
Theory of Operation SDM-650B Satellite Modem 5.4.3 Directed Sweep The directed sweep mode was designed to rapidly acquire a carrier of known frequency offset. If the customer knows where the carrier is going to be, the directed sweep mode can be much faster than the fast acquisition mode.
Page 145: Chapter 6. Maintenance
Chapter 6. MAINTENANCE This chapter provides information on the following: • System checkout • Fault isolation • Interface fault isolation • Module replacement • Module identification 6.1 System Checkout This section should be used as an aid in setting up a modem within an earth station. 6.1.1 Modulator The modem supplies a QPSK modulated result of the DATA I/O connector to the IF output connector (CP1).
Page 146: Demodulator
Maintenance SDM-650B Satellite Modem The first step in turning up a carrier is to set the output frequency. This is done in the Config menu on the front panel (refer to Chapter 4). The Config menu also allows the operator to: •...
Page 147 SDM-650B Satellite Modem Maintenance Refer to Figure 6-3 for a typical eye pattern with noise, and Figure 6-4 for a typical eye pattern without noise. Refer to Figure 6-5 for a typical eye constellation with noise, and Figure 6-6 for a typical eye constellation without noise.
Page 148: Figure 6-1. Typical Output Spectrum
Maintenance SDM-650B Satellite Modem Figure 6-1. Typical Output Spectrum Figure 6-2. Typical Output Spectrum 6–4 Rev. 6...
Page 149: Table 6-1. Efdata Conversion Of (S+N)/N To S/N And E
SDM-650B Satellite Modem Maintenance Table 6-1. EFData Conversion of (S+N)/N to S/N and E Various Code Rates (dB) Code Rate 1/2 Code Rate 3/4 Code Rate 7/8 (S+N)/N -0.6 10.0 10.5 10.1 10.1 10.1 10.1 11.0 10.6 10.6 10.6 10.6 11.5...
Page 150: Figure 6-3. Typical Eye Pattern With Noise (Approximately 7.5 Db E /N )
Maintenance SDM-650B Satellite Modem Figure 6-3. Typical Eye Pattern with Noise (Approximately 7.5 dB E Figure 6-4. Typical Eye Pattern without Noise 6–6 Rev. 6...
Page 151: Figure 6-5. Typical Eye Constellation With Noise (Approximately 7.5 Db E /N )
SDM-650B Satellite Modem Maintenance Figure 6-5. Typical Eye Constellation with Noise (Approximately 7.5 dB E Figure 6-6. Typical Eye Constellation without Noise Rev. 6 6–7...
Page 152: Test Points
Maintenance SDM-650B Satellite Modem 6.1.3 Test Points The following sections detail front panel test points, with a description of the signal that is to be present under normal operation. 6.1.3.1 Modulator Refer to Figure 6-7. TPG1 Ground. Q EYE Pattern.
Page 153: Demodulator
SDM-650B Satellite Modem Maintenance 6.1.3.2 Demodulator Refer to Figure 6-8. TP10 VCXO Control Voltage. Approximately 0 to +2.5V sweep range. TP23 Discriminator Voltage. Nominally +2.5V with 6 dB noise at 128 kbit/s. TPG1 Ground. Q EYE Pattern. Level is 1 Vp-p at the center of the eye crossing. The DC offset is about +2.4V.
Page 154: Sequential Decoder/Demod Card
Maintenance SDM-650B Satellite Modem 6.1.3.3 Sequential Decoder/Demod Card Refer to Figure 6-9. TPG1 Ground. VCXO Control Voltage. Sweeps from -2.5V to +2.5 VDC. IMAG — I Channel Magnitude Bit. Result of the soft bits from the soft decision interface. Transitions will occur in the presence of noise in the RF signal.
Page 155: Fault Isolation
SDM-650B Satellite Modem Maintenance 6.2 Fault Isolation System faults are reported in the Faults menu. Stored faults are reported in the StFaults menu. Refer to Chapter 4 for more information. The following sections list the system faults outlined in Chapter 4. Use the following information to isolate a problem, and help in deciding the appropriate action to be taken.
Page 156: Demodulator/Decoder Faults (Dmd_Flts Menu)
Maintenance SDM-650B Satellite Modem I-CHANNL Activity alarm for the I channel digital filter. This alarm is considered a major alarm, and will turn OFF the modulator output. An alarm in this position indicates either a fault in the scrambler, or if the scrambler is disabled, it indicates a loss of incoming data.
Page 157 SDM-650B Satellite Modem Maintenance I-CHANNL Indicates a loss of activity in the I channel of the quadrature demodulator. Typically indicates a problem in the modulator side of the circuit. Check for proper RF input to the demodulator. If the input to the demodulator is...
Page 158: Common Equipment Faults (Ceq_Flts Menu)
Maintenance SDM-650B Satellite Modem 6.2.3 Common Equipment Faults (CEq_Flts Menu) Fault Possible Problem and Action BATTERY M&C battery voltage fault. Indicates a low voltage in the memory battery. Typically will be active when a modem is first turned ON. Allow the modem to charge up the battery before any other action is taken.
Page 159: Interface Fault Isolation
SDM-650B Satellite Modem Maintenance 6.3 Interface Fault Isolation Stored faults for the interface are reported in the StFaults menu (refer to Chapter 4). The following sections list the interface faults. All other faults are discussed in Section 6.2. 6.3.1 Transmit Faults (TX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed.
Page 160: Receive Faults (Rx_Intf)
Maintenance SDM-650B Satellite Modem 6.3.2 Receive Faults (RX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed. Fault Possible Problem and Action BUF_UNFL Buffer Underflow. The plesiochronous buffer has underflowed. As buffer underflow is normally a momentary fault (there are clock problems if this is continuously present).
Page 161: Table 6-2. Programmable Data Rates For The Variable Rate Sdm-650B Modem
SDM-650B Satellite Modem Maintenance Table 6-2. Programmable Data Rates for the Variable Rate SDM-650B Modem 19.2 19.4 19.5 19.6 19.8 20.0 20.2 20.4 20.5 20.6 20.8 21.0 21.2 21.4 21.5 21.6 21.8 22.0 22.2 22.4 22.5 22.6 22.8 23.0 23.2 23.4...
Page 162 Maintenance SDM-650B Satellite Modem 204.5 204.8 205.0 205.5 206.0 206.4 206.5 207.0 207.5 208.0 208.5 209.0 209.5 209.6 210.0 210.5 211.0 211.2 211.5 212.0 212.5 212.8 213.0 213.5 214.0 214.4 214.5 215.0 215.5 216.0 216.5 217.0 217.5 217.6 218.0 218.5 219.0...
Page 163 SDM-650B Satellite Modem Maintenance 609.6 610.0 611.2 612.0 612.8 614.0 614.4 616.0 617.6 618.0 619.2 620.0 620.8 622.0 622.4 624.0 625.6 626.0 627.2 628.0 628.8 630.0 630.4 632.0 633.6 634.0 635.2 636.0 636.8 638.0 638.4 640.0 641.6 642.0 643.2 644.0 644.8...
Page 164: Figure 6-10. Rear View Without Cover
Maintenance SDM-650B Satellite Modem 2384.0 2392.0 2400.0 2408.0 2416.0 2424.0 2432.0 2440.0 2448.0 2456.0 2464.0 2472.0 2480.0 2488.0 2496.0 2504.0 2512.0 2520.0 2528.0 2536.0 2544.0 2552.0 2560.0 2568.0 2576.0 2584.0 2592.0 2600.0 2608.0 2616.0 2624.0 2632.0 2640.0 2648.0 2656.0 2664.0 2672.0...
Page 165: Module Replacement
SDM-650B Satellite Modem Maintenance 6.4 Module Replacement The modem cards are plug-in cards that can be replaced by removing the defective card, and reinserting the replacement. Card ejectors are available for use in removing the cards. Note: On the interface card, there are additional screws on the rear panel that need to be removed before the interface card is removed.
Page 166: Table 6-3. Efdata Part Numbers For Sdm-650B Modules
SDM-650B, 70/140 MHz, 50Ω Decoders Base Part Number — AS/0365 Dash # Description SDM-650B (Std, F, C), 70/140 MHz (with GND rails) SDM-650B (Std, F, C), 70 MHz (without GND rails) SDM-650B w/ASYNC Interface (offset crystal) SDM-650F, Aydin Data Rate Crystal...
Page 167: Appendix A. Data Rates And Filters
Appendix A. DATA RATES AND FILTERS The modem will operate at data rates from 19.2 kbit/s to 3.584 Mbit/s. Data rates from 19.2 to 48 kbit/s are 1/2 rate BPSK only. Variable rate filters can operate from 19.2 to 2048 kbit/s. Fixed rate filters allow operation from 19.2 to 3584 kbit/s.
Page 168: Figure A-1. Modulator Filter Card Change
Data Rates and Filters SDM-650B Satellite Modem VARIABLE RATE FIXED RATE MODULATOR FILTER MODULATOR FILTER MOUNTING MODULATOR HARDWARE (2) Figure A-1. Modulator Filter Card Change 5. Install the replacement daughter card, and ensure both screw holes line up with the mounting hardware. See Figure A-1.
Page 169 SDM-650B Satellite Modem Data Rates and Filters 6. Re-install the daughter board hold-down screws (Figure A-1). Re-insert the modulator into the chassis. 7. Remove the demodulator card (AS/0778) using the white card ejectors. 8. With a Phillips screwdriver, remove the four screws holding down the daughter card.
Page 170: Figure A-2. Demodulator Filter Card Change
Data Rates and Filters SDM-650B Satellite Modem DEMODULATOR ASSEMBLY AND REVISION NUMBER DATA RATE INFORMATION SERIAL NUMBER VARIABLE RATE DEMODULATOR FILTER FIXED RATE DEMODULATOR FILTER Figure A-2. Demodulator Filter Card Change A–4 Rev. 6...
Page 171: Hardware Configuration
This section lists the hardware configuration of a standard modem with a fixed rate filter installed. Hardware Requirements Assembly # Description AS/1099-X REV- Modem Chassis X = 1 — SDM-650B Chassis AS/0356 Rev. F or higher Monitor and Control M&C Software Requirements SDM-650B Ver. 2.66 or higher AS/0773-X - Modulator X = 1 —...
Page 172: Variable Rate Filters
Data Rates and Filters SDM-650B Satellite Modem A.2 Variable Rate Filters A.2.1 Data Rate Change Instructions 1. Turn OFF modem power switch. 2. Remove the modulator card (AS/0773) using the black card ejectors. Verify the daughter card is a variable rate filter (AS/0930). If not, refer to Section A.1.
Page 173: Hardware Configuration
Department for any questions regarding this matter. Hardware Requirements Assembly # Description AS/1099-X Rev. - Modem Chassis X = 1 — SDM-650B Chassis AS/0356 Rev. F Monitor and Control or higher M&C Software Requirements SDM-650B Ver. 2.66 or higher AS/0773-X - Modulator X = 1 —...
Page 174 Data Rates and Filters SDM-650B Satellite Modem The following functions are found in the Select Config menu. Refer to Chapter 4 for more information. Transmitter Rate. On entry, the current transmitter rate is displayed with the flashing cursor on the first character of the coding type on line 1, and the data rate on line 2.
Page 175: Utility
SDM-650B Satellite Modem Data Rates and Filters A.2.3 Utility The following functions are found in the Utility menu. Refer to Chapter 4 for the functions not mentioned below. FILTERS ADJUST Variable Rate Filters K Factor Settings. These are factory set parameters. The operator is not allowed to view or change these parameters without authorization from an EFData Customer Support Department representative.
Page 176 Data Rates and Filters SDM-650B Satellite Modem ASSIGN RX_FLTRS Demodulator Symbol Rate Assignment. The demodulator has four symbol rate filter assignments. Each filter is for a specific symbol rate. The data rate and coder rate for each filter is established upon initial modulator installation and when circumstances indicate the need to do so.
Page 177: Appendix B. Remote Control Operation
Note: For remote control operation information on the modem with the Trojan interface option installed, refer to Appendix G. B.1 Standard Version This section describes the remote control operation of the standard SDM-650B: • Firmware number: FW/0713-35R •...
Page 178: General
Remote Control Operation SDM-650B Satellite Modem B.1.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link. Commands and data are transferred on the remote control communications link as US ASCII-encoded character strings. The remote communications link is operated in a half-duplex mode.
Page 179: Device Address
SDM-650B Satellite Modem Remote Control Operation B.1.2.2 Device Address The device address is the address of the one satellite modem which is designated to receive a transmitted command, or which is responding to a command. Valid device addresses are 1 to 3 characters long, and in the range of 1 to 255. Address 0 is reserved as a global address which simultaneously addresses all devices on a given communications link.
Page 180: Command/Response
Remote Control Operation SDM-650B Satellite Modem B.1.2.3 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or cannot be implemented, a negative acknowledgment message is sent in response.
Page 181: Configuration Commands/Responses
SDM-650B Satellite Modem Remote Control Operation B.1.3 Configuration Commands/Responses B.1.3.1 Remote This command configures the modem for remote operation. The modem will respond to any status request at any time. However, the modem must be in “Remote Mode” to change configuration parameters.
Page 182: Set Modulator Power Offset
Remote Control Operation SDM-650B Satellite Modem B.1.3.5 Set Modulator Power Offset Command: <add/MPO_snn.n”cr” Response: >add/MPO_snn.n”cr””lf”] Status Only: <add/MPO_”cr” Response: >add/MPO_snn.n”cr””lf”] Where: snn.n = +20.0 to -20.0, in 0.5 dB increments. Notes: 1. This will be the highest modulator power that will be displayed and programmed.
Page 183: Modulator Rate
SDM-650B Satellite Modem Remote Control Operation B.1.3.7 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
Page 184: Select Modulator Rate
Remote Control Operation SDM-650B Satellite Modem B.1.3.7.2 Select Modulator Rate Command: <add/SMRx_”cr” Response: >add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter.
Page 185: Demodulator Rate
SDM-650B Satellite Modem Remote Control Operation B.1.3.8 Demodulator Rate The demodulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and decoder rate for each filter must be established upon initial demodulator installation, and when circumstances indicate the need to do so.
Page 186: Select Demodulator Rate
Remote Control Operation SDM-650B Satellite Modem B.1.3.8.2 Select Demodulator Rate Command: <add/SDRx_”cr” Response: >add/SDRx_”cr””lf”] Status Only: (See DR command.) Where: x = A, B, C, or D (Filter designator). Note: If the modem is commanded to a filter (rate) which is not assigned (N/A), the “error 2”...
Page 187: Differential Encoder Enable
SDM-650B Satellite Modem Remote Control Operation B.1.3.11 Differential Encoder Enable Command: <add/DENC_xxx”cr” Response: >add/DENC_xxx”cr”lf”] Status Only: <add/DENC_”cr” Response: >add/DENC_xxx”cr”lf”] Where: xxx = ON or OFF. B.1.3.12 Transmit Clock Command: <add/TC_xxx”cr” Response: >add/TC_xxx”cr””lf”] Status Only: <add/TC_”cr” Response: >add/TC_xxx”cr””lf”] Where: xxx = INT or EXT.
Page 188: Rf Loopback
Remote Control Operation SDM-650B Satellite Modem B.1.3.15 RF Loopback Command: <add/RFL_xxx”cr” Response: >add/RFL_xxx”cr””lf”] Status Only: <add/RFL_”cr” Response: >add/RFL_xxx”cr””lf”] Where: xxx = ON or OFF. B.1.3.16 IF Loopback Command: <add/IFL_xxx”cr” Response: >add/IFL_xxx”cr””lf”] Status Only: <add/IFL_”cr” Response: >add/IFL_xxx”cr””lf”] Where: xxx = ON or OFF.
Page 189: Date
SDM-650B Satellite Modem Remote Control Operation B.1.3.18 Date Command: <add/DATE_mm/dd/yy”cr” Response: >add/DATE_mm/dd/yy”cr””lf”] Status Only: <add/DATE_”cr” Response: >add/DATE_mm/dd/yy”cr””lf”] Where: mm = month. dd = day. yy = year. Example: Set modem 235 date to 11/30/87. Command: <235/DATE_11/30/87”cr” Response: >235/DATE_11/30/87”cr””lf”] B.1.3.19 Clear Stored Faults This command is used to clear all stored faults logged by the modem.
Page 190: Sweep Reacquisition
Remote Control Operation SDM-650B Satellite Modem B.1.3.21 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to ± 2500 Hz of the last known lock point. Use of this function may reduce reacquisition times at low data rates.
Page 191: Sweep Center Frequency
SDM-650B Satellite Modem Remote Control Operation B.1.3.22.1 Sweep Center Frequency This command sets the sweep center frequency. During carrier acquisition, the sweep starts at an offset, which is one-half the currently programmed sweep range (SWR_) from the sweep center frequency. The direction of the offset is determined by the currently programmed sweep direction (SD_).
Page 192: Sweep Direction
Remote Control Operation SDM-650B Satellite Modem B.1.3.22.3 Sweep Direction This command sets the direction of the sweep travel. “+” sets incremental sweep, while “-” sets decremental sweep. Command: <add/SD_s”cr””lf”] Response: >add/SD_s”cr””lf”] Status Only: <add/SD_”cr””lf”] Response: >add/SD_s”cr””lf”] Where: s = + or - (direction of sweep travel during acquisition).
Page 193: Buffer Clock
SDM-650B Satellite Modem Remote Control Operation B.1.3.24.1 Buffer Clock Command: <add/BC_xxx”cr” Response: >add/BC_xxx”cr””lf”] Status Only: <add/BC_”cr” Response: >add/BC_xxx”cr””lf”] Where: xxx = TXC, RXC, or EXT. Note: This command is only valid when Buffer Control is enabled. See the “BUFF_” command definition.
Page 194: Status Commands/Responses
Remote Control Operation SDM-650B Satellite Modem B.1.4. Status Commands/Responses B.1.4.1 Configuration B.1.4.1.1 Modulator/Coder Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder.
Page 195: Demodulator/Decoder Configuration Status
SDM-650B Satellite Modem Remote Control Operation B.1.4.1.3 Demodulator/Decoder Configuration Status The Demodulator/Decoder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration of the demod. Command: <add/DCS_”cr”...
Page 196: Demodulator/Decoder Configuration Program
Remote Control Operation SDM-650B Satellite Modem B.1.4.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: <add/DCP_”cr” Response: >add/DCP_”cr” Baseband Loopback (ON/OFF) BBL_xxx”cr” IF Loopback (ON/OFF) IFL_xxx”cr”...
Page 197: Modulator Status
SDM-650B Satellite Modem Remote Control Operation B.1.4.3 Modulator Status The modulator status is returned as a block of data which indicates general status information. Command: <add/MS_”cr” Response: >add/MS_”cr” RF Output (ON/OFF) actual status, not RF_xxx”cr” configured Module missing or will not program (OK/FLT) MOD_xxx”cr”...
Page 198: Common Equipment Status
Remote Control Operation SDM-650B Satellite Modem B.1.4.5 Common Equipment Status The common equipment status command causes a block of data to be returned, which indicates the status of the common equipment. Command: <add/CES_”cr” Response: >add/CES_”cr” Monitor and Control Module (OK/FLT) M&C_xxx”cr”...
Page 199: Ber Status
SDM-650B Satellite Modem Remote Control Operation B.1.4.7 BER Status B.1.4.7.1 Raw BER Command: <add/RBER_”cr” Response: >add/RBER_nnnnE-4”cr””lf”] Where: nnnn = RBER or < 1.0 (lower limit). Example: Request raw BER from modem 123. Command: <123/RBER_”cr” Response: >123/RBER_152E-4”cr””lf”] Where: RBER = .0152 errors/bit.
Page 200: E /N Status
Remote Control Operation SDM-650B Satellite Modem B.1.4.8 E Status The E status command causes the E ratio to be returned. E is returned in dB. Command: <add/EBN0_”cr” Response: >add/EBN0_n.ndB”cr””lf”] Example: Request E ratio from modem 2. Command: <2/EBN0_”cr” Response: >2/EBN0_6.2dB”cr””lf”] Where: E = 6.2 dB.
Page 201: Receive Signal Level Status
SDM-650B Satellite Modem Remote Control Operation B.1.4.11 Receive Signal Level Status Command: <add/RSL_”cr” Response: >add/RSL_-nn.ndBm”cr””lf”] B.1.4.12 Current Sweep Value This command returns the current sweep value and the decoder lock status. Command: <add/CSV_”cr””lf”] Response: >add/CSV_snnnnn”cr” CD_xxx”cr””lf”] Where: s = + or - (sweep offset direction).
Page 202: Stored Faults
Remote Control Operation SDM-650B Satellite Modem B.1.4.13 Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO FAULT” will be returned instead of the normal time/date status information.
Page 203: Common Equipment Stored Faults
SDM-650B Satellite Modem Remote Control Operation B.1.4.13.3 Common Equipment Stored Faults Command: <add/CSF_#”cr” Response: >add/CSF_# hh:mm:ss MM/DD/YY”cr” M&C_xxx”cr” Monitor and Control Module (OK/FLT) Data Interface Module (OK/FLT) INT_xxx”cr” Transmit Clock Loss (DS1 only) TXC_xxx”cr” Battery (OK/FLT) BAT_xxx”cr” +5V Power Supply (OK/FLT) PS1_xxx”cr”...
Page 204: Bulk Consolidated Status
Remote Control Operation SDM-650B Satellite Modem B.1.4.14 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,”...
Page 205 SDM-650B Satellite Modem Remote Control Operation Parameter 14 (p14): Demodulator rate currently programmed. p14 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 15 (p15): Demodulator filter A assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s.
Page 206: Bulk Consolidated Analog Status
Remote Control Operation SDM-650B Satellite Modem B.1.4.15 Bulk Consolidated Analog Status This command is similar to the “BCS_” command, but returns modem analog parameters. Command: <add/BCAS_”cr” Response: >add/BCAS_p1,p2,p3, . . . pn”cr””lf”] Where “pn” is the last parameter returned. Parameter 1 (p1): Receive signal level.
Page 207: Change Status
SDM-650B Satellite Modem Remote Control Operation Where: Character “c”: Demodulator fault status character 1. Bit 6 = 1 always. Bit 5 = Demodulator fault. Bit 4 = Carrier detect status (0 for decoder lock). Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of demodulator stored faults.
Page 208: Equipment Type
Remote Control Operation SDM-650B Satellite Modem B.1.4.18 Equipment Type This command returns the equipment model number and M&C firmware version number. Command: <add/ET_”cr” Response: >add/ET_SDM650_x.xxx”cr””lf”] Where: x.xxx = M&C firmware version. B–32 Rev. 6...
Page 209: Asynchronous Overhead Interface Support Option
SDM-650B Satellite Modem Remote Control Operation B.2 Asynchronous Overhead Interface Support Option This section describes the remote control operation of the SDM-650B with the asynchronous overhead channel unit option installed: • Firmware number: FW/0713-34L • Software version: 4.12A B.2.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link.
Page 210: Start Character
Remote Control Operation SDM-650B Satellite Modem B.2.2.1 Start Character A single character precedes all messages transmitted on the remote link. This character flags the start of a message. This character is: • “ ” for commands < • “ ” for responses >...
Page 211: Command/Response
SDM-650B Satellite Modem Remote Control Operation B.2.2.3 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or can not be implemented, a negative acknowledgment message is sent in response.
Page 212: Modulator Configuration Commands
Remote Control Operation SDM-650B Satellite Modem B.2.3 Modulator Configuration Commands B.2.3.1 Set Modulator Frequency Command: <add/MF_nnn.nnnn”cr” Response: >add/MF_nnn.nnnn”cr” RF_OFF”cr””lf”] Status Only: <add/MF_”cr” Response: >add/MF_nnn.nnnn”cr””lf”] Where: nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000 for the 140 MHz modulator. Note: When modulator frequency is changed, the RF output is switched OFF.
Page 213: Set Modulator Output Power Level
SDM-650B Satellite Modem Remote Control Operation B.2.3.4 Set Modulator Output Power Level Command: <add/MOP_snn.n”cr” Response: >add/MOP_snn.n”cr””lf”] Status Only: <add/MOP_”cr” Response: >add/MOP_snn.n”cr””lf”] Where: snn.n = +20.0 to -45.0, in 0.5 dB increments for 140 MHz modulator. snn.n = +20.0 to -30.0, in 0.5 dB increments for 70 MHz modulator.
Page 214: Modulator Rate
Remote Control Operation SDM-650B Satellite Modem B.2.3.5 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
Page 215: Select Modulator Rate
SDM-650B Satellite Modem Remote Control Operation B.2.3.5.2 Select Modulator Rate Command: <add/SMRx_”cr” Response: >add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter.
Page 216: Differential Encoder Enable
Remote Control Operation SDM-650B Satellite Modem B.2.3.7 Differential Encoder Enable Command: <add/DENC_xxx”cr” Response: >add/DENC_xxx”cr”lf”] Status Only: <add/DENC_”cr” Response: >add/DENC_xxx”cr”lf”] Where: xxx = ON or OFF. B.2.4 Demodulator Configuration Commands B.2.4.1 Set Demodulator Frequency Command: <add/DF_nnn.nnnn”cr” Response: >add/DF_nnn.nnnn”cr””lf”] Status Only: <add/DF_”cr”...
Page 217: Demodulator Filter Rate Assignment
SDM-650B Satellite Modem Remote Control Operation B.2.4.2.1 Demodulator Filter Rate Assignment Command: <add/ADRx_nnn_mmmm.m”cr” Response: >add/ADRx_nnn_mmmm.m”cr””lf”] Status Only: <add/ADRx_”cr” Response: >add/ADRx_nnn_mmmm.m”cr””lf”] Where: x = A, B, C, or D (Filter designator). nnn = 1/2, 3/4, 7/8, or BP12 (Decoder rate). mmmm.m = 9.6 to 4080.0 (Data rate).
Page 218: Descramble Enable
Remote Control Operation SDM-650B Satellite Modem B.2.4.3 Descramble Enable Command: <add/DE_xxx”cr” Response: >add/DE_xxx”cr””lf”] Status Only: <add/DE_”cr” Response: >add/DE_xxx”cr””lf”] Where: xxx = ON or OFF. B.2.4.4 RF Loopback Command: <add/RFL_xxx”cr” Response: >add/RFL_xxx”cr””lf”] Status Only: <add/RFL_”cr” Response: >add/RFL_xxx”cr””lf”] Where: xxx = ON or OFF.
Page 219: Sweep Reacquisition
SDM-650B Satellite Modem Remote Control Operation B.2.4.7 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to ± 2500 Hz of the last known lock point. Use of this function may reduce reacquisition times at low data rates.
Page 220: Sweep Center Frequency
Remote Control Operation SDM-650B Satellite Modem B.2.4.8.1 Sweep Center Frequency This command sets the sweep center frequency. During carrier acquisition, the sweep starts at an offset which is one-half the currently programmed sweep range (SWR_) from the sweep center frequency. The direction of the offset is determined by the currently programmed sweep direction (SD_).
Page 221: Sweep Direction
SDM-650B Satellite Modem Remote Control Operation B.2.4.8.3 Sweep Direction This command sets the direction of the sweep travel. “+” sets incremental sweep, while “-” sets decremental sweep. Command: <add/SD_s”cr””lf” Response: >add/SD_s”cr””lf”] Status Only: <add/SD_”cr””lf” Response: >add/SD_s”cr””lf”] Where: s = + or - (direction of sweep travel during acquisition).
Page 222: Receive Clock
Remote Control Operation SDM-650B Satellite Modem B.2.5.3 Receive Clock Command: <add/RC_xxx”cr” Response: >add/RC_xxx”cr””lf”] Status Only: <add/RC_”cr” Response: >add/RC_xxx”cr””lf”] Where: xxx = NRM or INV. B.2.5.4 External Reference Frequency Command: <add/ERF_nnnnn”cr” Response: >add/ERF_nnnnn”cr””lf”] Status Only: <add/ERF_”cr” Response: >add/ERF_nnnnn”cr””lf”] Where: nnnnn = 8 to 99992 (external reference frequency in kHz, must be a multiple of 8 kHz).
Page 223: Interface Coding Format Transmit
SDM-650B Satellite Modem Remote Control Operation B.2.5.7 Interface Coding Format Transmit Command: <add/ICFT_xxxx”cr” Response: >add/ICFT_xxxx”cr””lf”] Status Only: <add/ICFT_”cr” Response: >add/ICFT_xxxx”cr””lf”] Where: xxxx = AMI, HDB3, B6ZS, or B8ZS. B.2.5.8 Interface Coding Format Receive Command: <add/ICFR_xxxx”cr” Response: >add/ICFR_xxxx”cr””lf”] Status Only: <add/ICFR_”cr”...
Page 224: Transmit Overhead Baud Rate
Remote Control Operation SDM-650B Satellite Modem B.2.5.11 Transmit Overhead Baud Rate Command: <add/TOBR_nnnnn”cr” Response: >add/TOBR_nnnnn”cr””lf”] Status Only: <add/TOBR_”cr” Response: >add/TOBR_nnnnn”cr””lf”] Where: nnnnn = 110, 150, 300, 600, 1200, 2400, 4800, 9600, 19200, or 38400. B.2.5.12 Receive Overhead Baud Rate Command: <add/ROBR_nnnnn”cr”...
Page 225: Overhead Channels Parity
SDM-650B Satellite Modem Remote Control Operation B.2.5.15 Overhead Channels Parity Command: <add/OCP_xxxx”cr” Response: >add/OCP_xxxx”cr””lf”] Status Only: <add/OCP_”cr” Response: >add/OCP_xxxx”cr””lf”] Where: xxxx = ODD, EVEN, or NONE. B.2.5.16 Interface Substitution Pattern (Transmit 2047 Pattern) Command: <add/ISP_xxx”cr” Response: >add/ISP_xxx”cr””lf”] Status Only: <add/ISP_”cr”...
Page 226: Date
Remote Control Operation SDM-650B Satellite Modem B.2.6.2 Date Command: <add/DATE_mm/dd/yy”cr” Response: >add/DATE_mm/dd/yy”cr””lf”] Status Only: <add/DATE_”cr” Response: >add/DATE_mm/dd/yy”cr””lf”] Where: mm = month. dd = day. yy = year. Example: Set modem 235 date to 11/30/87. Command: <235/DATE_11/30/87”cr” Response: >235/DATE_11/30/87”cr””lf”] B.2.6.3 Remote This command configures the modem for remote operation.
Page 227: Modem Operation Mode
SDM-650B Satellite Modem Remote Control Operation B.2.6.5 Modem Operation Mode This command configures the modem for simplex or duplex operation modes. When transmit-only mode is selected, receive faults are inhibited. When receive-only mode is selected, transmit faults are inhibited. Command: <add/MOM_xxxxxxx”cr”...
Page 228: Maximum Aupc Power Limit
Remote Control Operation SDM-650B Satellite Modem B.2.7.1.3 Maximum AUPC Power Limit Command: <add/MAXP_-nn.n”cr” Response: >add/MAXP_-nn.n”cr””lf”] Status Only: <add/MAXP_”cr” Response: >add/MAXP_-nn.n”cr””lf”] Where: nn.n = 5.0 to 30.0, in 0.5 increments (power in dBm). B.2.7.1.4 Minimum AUPC Power Limit Command: <add/MINP_-nn.n”cr” Response: >add/MINP_-nn.n”cr””lf”]...
Page 229: Aupc Local Carrier Loss Action
SDM-650B Satellite Modem Remote Control Operation B.2.7.1.7 AUPC Local Carrier Loss Action Command: <add/LCL_xxxx”cr” Response: >add/LCL_xxxx”cr””lf”] Status Only: <add/LCL_”cr” Response: >add/LCL_xxxx”cr””lf”] Where: xxxx = HOLD, NOM, or MAX (power level setting when local carrier loss). B.2.7.1.8 AUPC Remote Carrier Loss Action Command: <add/RCL_xxxx”cr”...
Page 230: Remote Interface Substitution Pattern (Transmit 2047 Pattern
Remote Control Operation SDM-650B Satellite Modem B.2.7.2.2 Remote Interface Substitution Pattern (Transmit 2047 Pattern) Command: <add/RISP_xxx”cr” Response: >add/RISP_xxx”cr””lf”] Status Only: <add/RISP_”cr” Response: >add/RISP_xxx”cr””lf”] Where: xxx = ON or OFF (remote transmit 2047 pattern enable). B.2.7.2.3 Remote Interface Baseband Loopback Command: <add/RBBL_xxx”cr”...
Page 231: Status Commands/Responses
SDM-650B Satellite Modem Remote Control Operation B.2.8 Status Commands/Responses B.2.8.1 Configuration Status B.2.8.1.1 Modulator/Coder Configuration Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder.
Page 232: Modulator/Coder Configuration Program
Remote Control Operation SDM-650B Satellite Modem B.2.8.1.2 Modulator/Coder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: <add/MCP_”cr” Response: >add/MCP_”cr” Modulator Frequency MF_nnn.nnnn”cr” Modulator Power Offset MPO_snn.n”cr”...
Page 233: Demodulator/Decoder Configuration Status
SDM-650B Satellite Modem Remote Control Operation B.2.8.1.3 Demodulator/Decoder Configuration Status The Demodulator/Decoder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration of the demod. Command: <add/DCS_”cr”...
Page 234: Demodulator/Decoder Configuration Program
Remote Control Operation SDM-650B Satellite Modem B.2.8.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 M:N protection switch to collect information that is necessary to configure backup modems. Command: <add/DCP_”cr” Response: >add/DCP_”cr” IF Loopback (ON/OFF) IFL_xxx”cr” RF Loopback (ON/OFF) RFL_xxx”cr”...
Page 235: Interface Configuration Status
SDM-650B Satellite Modem Remote Control Operation B.2.8.1.5 Interface Configuration Status The interface configuration status command causes a block of data to be returned by the addressed modem. The block reflects the current configuration of the interface. Command: <add/ICS_”cr” Response: >add/ICS_”cr”...
Page 236: Modem Faults Status (Summary
Remote Control Operation SDM-650B Satellite Modem B.2.8.2 Modem Faults Status (Summary) This command returns the current overall fault conditions of the modem. Command: <add/MFS_”cr” Response: >add/MFS_”cr” Demodulator (FLT/OK) DMD_xxx”cr” Modulator (FLT/OK) MOD_xxx”cr” Common Equipment (FLT/OK) CEQ_xxx”cr” Interface Transmit Side (OK/FLT) ITX_xxx”cr”...
Page 237: Common Equipment Status
SDM-650B Satellite Modem Remote Control Operation B.2.8.5 Common Equipment Status The common equipment status command causes a block of data to be returned which indicates the status of the common equipment. Command: <add/CES_”cr” Response: >add/CES_”cr” Monitor and Control Module (OK/FLT) M&C_xxx”cr”...
Page 238: Bit Error Rate Status
Remote Control Operation SDM-650B Satellite Modem B.2.8.8 Bit Error Rate Status B.2.8.8.1 Raw BER Command: <add/RBER_”cr” Response: >add/RBER_nnnnE-4”cr””lf”] Where: nnnn = RBER. nnnn = < 1.0 (lower limit). Example: Request raw BER from modem 123. Command: <123/RBER_”cr” Response: >123/RBER_152E-4”cr””lf”] Where: RBER = 0.0152 errors/bit.
Page 239: Modulator Rate
SDM-650B Satellite Modem Remote Control Operation B.2.8.9 E The E status command causes the E ratio to be returned. E is returned in dB. Command: <add/EBN0_”cr” Response: >add/EBN0_n.ndB”cr””lf”] Example: Request E ratio from modem 2. Command: <2/EBN0_”cr” Response: >2/EBN0_6.2dB”cr””lf”] Where: E = 6.2 dB.
Page 240: Receive Signal Level
Remote Control Operation SDM-650B Satellite Modem B.2.8.12 Receive Signal Level Command: <add/RSL_”cr” Response: >add/RSL_-nn.ndBm”cr””lf”] B.2.8.13 Current Sweep Value This command returns the current sweep value and the decoder lock status. Command: <add/CSV_”cr” Response: >add/CSV_snnnnn”cr” CD_xxx”cr””lf”] Where: s = + or - (sweep offset direction).
Page 241: Stored Faults
SDM-650B Satellite Modem Remote Control Operation B.2.8.16 Stored Faults Information on stored faults is returned when requested. If no stored fault exists for a given fault number, the words “NO FAULT” will be returned instead of the normal time/date status information.
Page 242: Common Equipment Stored Faults
Remote Control Operation SDM-650B Satellite Modem B.2.8.16.3 Common Equipment Stored Faults Command: <add/CSF_#”cr” Response: >add/CSF_# hh:mm:ss MM/DD/YY”cr” M&C_xxx”cr” Monitor and Control Module (OK/FLT) Data Interface Module (OK/FLT) INT_xxx”cr” Battery (OK/FLT) BAT_xxx”cr” +5V Power Supply (OK/FLT) PS1_xxx”cr” +12V Power Supply (OK/FLT) PS2_xxx”cr”...
Page 243: Bulk Consolidated Status
SDM-650B Satellite Modem Remote Control Operation B.2.8.17 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,”...
Page 244 Remote Control Operation SDM-650B Satellite Modem Parameter 15 (p15): Demodulator filter B assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 16 (p16): Demodulator filter C assignment. p16 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s.
Page 245: Bulk Consolidated Analog Status
SDM-650B Satellite Modem Remote Control Operation Parameter 40 (p40): Interface buffer size. (See Note 1) p40 = nnnnnn, where “nnnnnn” is the currently programmed buffer size in bits. Notes: 1. Available with buffer support hardware only. 2. Parameters 23, 24, and 25 are only returned when fast acquisition is enabled. See the “FAM_”...
Page 246: Bulk Consolidated Status Faults
Remote Control Operation SDM-650B Satellite Modem B.2.8.19 Bulk Consolidated Status Faults This command causes all modem fault status to be returned. To reduce the length of the response, fault status is embedded into the bit structure of the characters that are returned.
Page 247 SDM-650B Satellite Modem Remote Control Operation Where: Character “f”: Common equipment fault status character 2. Bit 6 = 1 always. Bit 5 = Battery fault. Bit 4 = +5V fault. Bit 3 = +12V fault. Bit 2 = -12V fault.
Page 248: Bulk Consolidated Status Aupc
Remote Control Operation SDM-650B Satellite Modem B.2.8.20 Change Status This command indicates that a change has or has not occurred on either the BCS_ or the BCSF_ response since the last BCS_ or BCSF_ poll. Command: <add/CS_”cr” Response: >add/CS_x”cr””lf”] Where: x = “@”...
Page 249: Sdm-650B Standard Modem
Fairchild • Comstream • Fairchild Aydin data rate This appendix allows the user to configure and/or identify compatible modems. C.1 SDM-650B Standard Modem The standard modem has the following assembly hardware configuration: AS/1099-1 SDM-650B Chassis M&C Card AS/0356 M&C Software...
Page 250: Sdm-650B Fairchild-Compatible Modem
AS/0929-3 — Variable Rate AS/0698-X FDC COMP — Fixed Rate Decoder Software U8 FW/0562-2 C.3 SDM-650B Aydin Data Rate Modem To change the Fairchild-compatible modem to an Aydin compatible data rate, additional changes must be made to the Fairchild-compatible configuration: Modulator Card AS/0773 12 (Aydin Data Rate, crystal = 4.117333 MHz)
Page 251: Appendix D. Software Change Instructions
Appendix D. SOFTWARE CHANGE INSTRUCTIONS Steps 1 through 5 are instructions for changing software on the M&C card. Steps 6 through 9 are instructions for changing software on the Viterbi decoder card. If the Viterbi decoder software does not need to be changed, skip to Step 10 and continue. To change the software: 1.
Page 252: Table D-1. Efdata M&C Viterbi Decoder Firmware
Software Change Instructions SDM-650B Satellite Modem 8. Install the new firmware FW/XXXX in UX position on the Viterbi decoder. See Table D-1 for the definition of the various firmware that is available. 9. Re-install the decoder into the modem chassis.
Page 253: Appendix E. Agc Interface
Appendix E. AGC INTERFACE The AGC interface option has been designed for external monitoring of the dynamic range of a modem. The AGC interface output will be 0V out for minimum modem power, and +10V out for maximum modem power. Rear panel gain and offset adjustments allow fine tuning of these voltages.
Page 254: Connector Pinouts
AGC Interface SDM-650B Satellite Modem DATA GROUND I/OI ERDE TX/IF OUTPUT GAIN REMOTE OFFSET FAULT RX/IF INPUT MADE IN USA Figure E-1. Rear Panel View E.1 Connector Pinouts The AGC interface is supplied on a 9-pin female D connector that is accessible from the rear panel.
Page 255: Installation Procedure
SDM-650B Satellite Modem AGC Interface E.2.2 Installation Procedure Refer to Figure E-2 as needed. To install the AGC interface option: 1. Remove the rear panel of the modem. 2. Using the hardware provided, install the AS/0769 board to the modem motherboard between CP1 and CP2 (IF OUT and IF IN).
Page 256 AGC Interface SDM-650B Satellite Modem Data -5 +12 -12 +5 IF OUTPUT MOD J1 Remote AS/0769 AGC Interface DECODER J2 E2 E3 E4 Fault DEMOD J3 IF INPUT Gnd -5 +12 -12 +5 Mother Board Wire Connections Figure E-2. Wiring Diagram E–4...
Page 257 SDM-650B Satellite Modem AGC Interface Figure E-3. AGC Adapter Board Rev. 5 E–5...
Page 258 AGC Interface SDM-650B Satellite Modem This page is intentionally left blank. E–6 Rev. 5...
Page 259: Appendix F. Asynchronous Overhead Channel Unit
Appendix F. ASYNCHRONOUS OVERHEAD CHANNEL UNIT This appendix provides information on operating the modem from the front panel with the asynchronous overhead channel unit option installed. The following version is described: • Firmware number: FW/0713-34L • Software version: 4.12A Notes: 1.
Page 260: Functional Description Of Async Overhead Channel Unit
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1 Functional Description of ASYNC Overhead Channel Unit The ASYNC overhead interface module consists of three subassemblies: • Connector board (AS/1328) • Terrestrial interface (AS/1311) • Data processor board (AS/1289) The connector board provides the physical interface utilizing a 50-pin D connector. The terrestrial interface contains all circuitry required for G.703, RS-422, MIL-STD-188, and...
Page 261: Receive Section
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit RECEIVE SECTION TRANSMIT SECTION FRAMING/ RS-232 TIMING ES TO ES ASYNC LOGIC (MUX) INTERFACE MODEM LPBK LPBK DEFRAME/TIMING RS-232 LOGIC (DEMUX) INTERFACE ES TO ES ASYNC TX DEJITTER T1/E1 T2/E2 G.703 INTERFACE BASE...
Page 262 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1.1 Terrestrial Interface The terrestrial interface (AS/1311) forms the top, when mated with the connector board, of the 2-board module. The terrestrial interface contains all balanced pair drivers and receivers for: • RS-422 •...
Page 263: Table F-1. Asynchronous Overhead Jumpers
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit JP11 AS/1311 REV JP13 ASYNC OVERHEAD TERRESTRIAL INTERFACE BOARD JP10 JP12 Figure F-2. Asynchronous Overhead Interface Board Table F-1. Asynchronous Overhead Jumpers JP # Pin # Function 1 to 3, and 2 to 4 V.35, RS-422, MIL-STD-188...
Page 264: Multiplexer
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.1.2 Multiplexer The data processor (AS/1289) forms the bottom of the 2-board module. This board contains the data multiplexer and demultiplexer. The synchronous data stream is multiplexed with a 1/15 overhead channel, and the resultant information is interfaced to the modulator/coder section of the modem.
Page 265: Plesiochronous Buffer
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.1.4 Plesiochronous Buffer Where the option is installed, data from the DEMUX section is fed into a plesiochronous buffer. The buffer size is selectable in increments of 1, 2, 4, 6, 8, 12, 24, and 32 ms. The buffer is automatically centered on resumption of service after an outage.
Page 266: Async Interface Connector Pinouts
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.2 ASYNC Interface Connector Pinouts The ASYNC interface is provided on a 50-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
Page 267: Async Interface Specifications
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.3 ASYNC Interface Specifications Main Channel Physical Interface MIL-STD-188-144 Factory Option RS-422/-449 V.35 G.703 Data Rates 9.6K, 19.2K, 32 k/bits to 8.448 Mbit/s, in 32 k/bits steps G.703 Data Rates 1.544 Mbit/s Jumper Selectable 2.048 Mbit/s...
Page 268: Functional Description Of Async Overhead Channel Unit With Aupc
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.4 Functional Description of ASYNC Overhead Channel Unit with AUPC The ASYNC overhead channel unit with the AUPC option functions very much the same as the original ASYNC overhead channel unit, except for some added features.
Page 269: Modem-To-Modem Channel For Remote M&C
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit The action at loss of lock is as follows (modem A loses carrier detect): 1. Modem A sets its power to Nominal, Hold, or Maximum, as specified by Carrier Loss action. 2. Modem A sends Carrier Lost command to modem B.
Page 270: Front Panel Operation
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5 Front Panel Operation Note: The same version of firmware (FW/0713-34L, 4.12A) is used for the asynchronous overhead channel unit, whether or not the AUPC option is installed. However, if the modem hardware does not support AUPC, the AUPC-related menus and options (e.g., SELECT REMOTE;...
Page 271: Menus And Options Overview
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.1 Menus and Options Overview Refer to Section F.5.2 for menu and option explanations. Note: The “A” after the software version designates “Asynchronous.” Table F-3. Main Front Panel Menu with Asynchronous Overhead (with AUPC)
Page 272: Table F-5. Select Configuration Demodulator Menu (With Aupc
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem Table F-5. Select Configuration Demodulator Menu (with AUPC) Menus Submenus/Options Comments RX-x Code_Rate x = A, B, C, D, or V RX_Freq 50.000 to 90.000 MHz, or In 2.5 kHz steps. 100.000 to 180.000 MHz...
Page 273: Table F-6. Select Configuration Interface Menu (With Aupc
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-6. Select Configuration Interface Menu (with AUPC) Menus Submenus/Options Comments TX_clock External Internal Buf_clk Satellite Internal Ext_Ref External RX_clock Normal Inverted EXT_REF Typical: 1.544 MHz 5 MHz 10 MHz BBLoopBk INTF_LBk TX CODE...
Page 274: Table F-7. Select Configuration Aupc Menu (With Aupc
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem CH LENTH 5 bits 6 bits 7 bits 8 bits STOP BIT 1 bit 2 bits PARITY EVEN NONE Table F-7. Select Configuration AUPC Menu (with AUPC) Menus Submenus/Options Comments AUPC NOM PWR...
Page 275: Table F-9. Select Faults Menu (With Aupc
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-9. Select Faults Menu (with AUPC) Menus Submenus/Options Comments Mod Flts RF_Syn – – – – – – – Data_Clk TClk_Syn I-Channl Q-Channl AGC levl Module Dmd Flts C_Detect + – + + + + – –...
Page 276: Table F-10. Select Stored Faults (Stfaults) Menu (With Aupc
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem Table F-10. Select Stored Faults (StFaults) Menu (with AUPC) Menus Submenus/Options Comments Mod Fltx RF_Syn Mod Flt0 through Mod Flt9. Data_Clk MM/DD/YY TClk_Syn HH/MM/SS I-Channl Q-Channl AGC_levl Module Dmd Fltx C_Detect Dmd Flt0 through Dmd Flt9.
Page 277: Table F-12. Select Utility Menu (With Aupc
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Table F-12. Select Utility Menu (with AUPC) Menus Submenus/Options Comments Time Seconds (SS). Reset at [ENTER]. HH:MM AM/PM Date MM/DD/YY LAMP TEST? Add: 1 Address = 1 to 255 Status only. xxxxyyyy Parity:...
Page 278: Menu Explanations
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2 Menu Explanations F.5.2.1 Select Configuration Refer to Table F-3. Modem configuration may be viewed or changed by entering the Config menu from the Select menu on the front panel. After entering the Config menu, use to select ←...
Page 279: Configuration Modulator
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.1.1 Configuration Modulator Refer to Table F-4. TX-x Transmitter Rate Selection. Select one of four pre-defined transmitter coder/data rate combinations or a variable rate selection. On entry, the current transmitter rate is displayed with the flashing cursor on the first character of the code rate on line 1.
Page 280 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem CW_Mode Programs the modem for continuous wave mode. (Test Mode Configuration Three modes of operation are available: Option) • Center • Dual • Offset Center Mode: Generates a carrier at the current modulator frequency. This can be used to measure the output frequency.
Page 281: Configuration Demodulator
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.1.2 Configuration Demodulator Refer to Table F-5. RX-x Receiver Rate Selection. Select one of four pre-defined receiver decoder/data rate combinations or a variable rate selection. On entry, the current receiver rate is displayed with the flashing cursor on the first character of the code rate on line 1.
Page 282 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem SWP_RACQ Sets the sweep reacquisition rate from 0 to 999 seconds. The time selected with this parameter is the time that the modem will remain in a narrow sweep (± 10%) after acquisition has been accomplished.
Page 283: Configuration Interface
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit BERT_set This function is used to set the BER threshold. If the BER threshold set is exceeded, a receive fault will be indicated by the modem status indicators. BER threshold may be set from 1E-3 to 1E-8, or may be disabled by specifying None.
Page 284 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem BBLoopBk Programs the modem for baseband loopback operation. (Test Mode Configuration When baseband loopback is turned ON, baseband terrestrial data is Option) looped back on the customer side of the interface. Note: Asynchronous data is not looped back in the baseband loopback operation.
Page 285 SDM-650B Satellite Modem Asynchronous Overhead Channel Unit RX BAUD Programs the receiver baud rate. On entry, the current receiver baud rate is displayed with the flashing cursor on the first character. Use [ ↑ ] and [ ↓ ] to select the desired rate.
Page 286: Configuration Aupc
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.1.4 Configuration AUPC Refer to Table F-7. AUPC Programs the AUPC ON or OFF. On entry, the current status is displayed with the flashing cursor on the first character. Use the arrow keys to select ON or OFF. Press [ENTER] to execute the change.
Page 287: Select Monitor
SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.2 Select Monitor Refer to Table F-8. When the Monitor level is entered, use to select the desired monitor function. ← → Each monitor function is displayed in real time as long as it is selected.
Page 288: Select Faults
Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.3 Select Faults Refer to Table F-9. The Faults level is accessible from the Select menu. Faults are similar to monitor functions, they display the current fault status of the group being displayed. Use ←...
Page 289 SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.3.1 Modulator Faults (Mod_FLTS) RF_Syn Modulator RF synthesizer fault. Data Clk Transmit data clock activity fault. TClk Syn Transmit clock synthesizer fault. I-Channl I channel activity fault. Q-Channl Q channel activity fault. AGC_levl Automatic gain control level fault.
Page 290 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.3.4 Transmit Faults (TX_INTF) The faults listed below are only displayed when the ASYNC overhead channel unit is installed. Refer to Section 6.2 for option explanations. TX_PLL Interface transmit clock phase locked loop fault.
Page 291 SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.4 Select Stored Faults (StFaults) Refer to Table F-10. The modem stores the first 10 (Flt0 to Flt9) occurrences of fault status changes in each of the six major fault categories. Each stored fault status change is stored with the time and date of the occurrence.
Page 292 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem F.5.2.5 Select Remote Refer to Table F-11. The remote functions may be viewed or changed by entering the Remote level from the Select menu on the front panel. After entering the Remote menu, use to select ←...
Page 293 SDM-650B Satellite Modem Asynchronous Overhead Channel Unit F.5.2.6 Select Utility Refer to Table F-12. The Utility functions provide a means to set the time and date of the modem real time clock circuit. Provisions are also made for assigning data and code rates to the modulator and demodulator.
Page 294 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem POW ADJ Modulator power adjust offset. Allows the operator to offset the modulator output power readout in the Config menu. This will be the highest modulator power that will be displayed and programmed. This feature does not actually change the modulator power level.
Page 295 SDM-650B Satellite Modem Asynchronous Overhead Channel Unit Assign TX_Fltrs Transmit filter display/assignment utility. Used to view current filter rate assignments and to make filter rate reassignments. The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and code rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
Page 296 Asynchronous Overhead Channel Unit SDM-650B Satellite Modem This page is intentionally left blank. F–38 Rev. 5...
Page 297 Appendix G. TROJAN INTERFACE This appendix provides information on the Trojan interface option for the SDM-650B, including: • Functional description • Connector pinouts • Specifications • Configuration guidelines • Front panel operation information • Remote control operation information G.1 Functional Description...
Page 298 Trojan Interface SDM-650B Satellite Modem The data rate synthesizer may take its input reference clock (REF_CLK) from one of four different sources: • Transmit clock • Receive clock • External Station Clock (MC) • Internal clock (SCT) The phase-lock loop which locks to the reference has a very narrow bandwidth, effectively dejittering the reference.
Page 299 SDM-650B Satellite Modem Trojan Interface Receive Receive Data Rate (kbit/s) Frequency (kHz) 3584 4096 4096 4096 4096 1024 4096 1544 3088 2048 4096 Receive Receive Data Rate (kbit/s) Frequency (kHz) 3584 4096 4096 4096 4096 1024 4096 1544 3088 2048...
Page 300 Trojan Interface SDM-650B Satellite Modem Receiver Ready (RR) indicates that an RF carrier is being received and demodulated with a sufficiently low error rate for the decoder to remain locked. The MIL-STD-188-114 interface also provides bi-directional relay loopback of both the clock and data at the DCE interface.
Page 301 SDM-650B Satellite Modem Trojan Interface G.2 Connector Pinouts The Asynchronous dejittered MIL-STD-188-114 interface is provided on a 37-pin female D connector accessible from the rear panel of the modem. Screw locks are provided for mechanical security of the mating connector.
Page 302 Trojan Interface SDM-650B Satellite Modem G.3 Specification G.3.1 MIL-STD-188-114 Parameters Circuit Supported SD, ST, TT, RD, RT, DM, RR, MC, MOD FAULT, DEMOD FAULT. Amplitude (RD, RT, ST, DM, RR) 4, ± 2V differential into 100Ω. DC Offset (RD, RT, ST, DM, RR) ±...
Page 303 SDM-650B Satellite Modem Trojan Interface G.4 Configuration Guide Menu Selection Options BBLoopBk (Baseband Loopback) OFF/ON EXT_REF (Station Clock Freq) n kHz (must be evenly divisible by 8 kHz) REF_CLK (Ref Clock Source) Transmit Receive External (MC) Internal (SCT) TX_clock External (TT)
Page 304 Trojan Interface SDM-650B Satellite Modem G.4.2 Demodulator/Decoder Defaults (Dmd_Flts) Receive Filter A 7/8 decode rate, 56 kbit/s Receive Filter B 3/4 decode rate, 56 kbit/s Receive Filter C 1/2 decode rate, 56 kbit/s Receive Filter D 1/2 decode rate, 64 kbit/s Receive Rate Selected “A”...
Page 305: Table G-1. Main Front Panel Menu (Trojan Interface
Trojan interface. Note: For general information on front panel operation, refer to Chapter 4. Refer to Tables G-1 through G-8 for front panel menus and options for the SDM-650B with the Trojan interface option installed.
Page 306: Table G-2. Select Configuration Modulator Menu
Trojan Interface SDM-650B Satellite Modem Table G-2. Select Configuration Modulator Menu Menus Submenus/Options Comments TX-x Code_Rate x = A, B, C, D, or V TX_Freq 50.0000 to 90.0000 MHz In 2.5 kHz steps. or 100.000 to 180.000 MHz RF_Out TX_Power -5.0 dBm to -25 dBm...
Page 307: Table G-4. Select Configuration Interface Menu
SDM-650B Satellite Modem Trojan Interface Table G-4. Select Configuration Interface Menu Menus Submenus/Options Comments TX_Clock REF_CLK External RX_Clock Normal Inverted BUF_CNTR YES/NO? BUF_DPTH 512 to 32768 bits BBLoopBk EXT_REF 8 kHz to 10 MHz In 8 kHz steps. Ref_Clk Transmit...
Page 308: Table G-6. Select Faults (Stfaults) Menu
Trojan Interface SDM-650B Satellite Modem Table G-6. Select Faults (StFaults) Menu Menus Submenus/Options Comments Mod Flts RF_Syn Data_Clk TClk_Syn I-Channl Q-Channl AGC_levl Module Dmd Flts C_Detect RF_Syn Data_Clk I-Channl Q-Channl Dscramblr BERthrsh Module CEq Flts Battery -12 volt +12 volt...
Page 309: Table G-7. Select Stfaults Menu
SDM-650B Satellite Modem Trojan Interface Table G-7. Select StFaults Menu Menus Submenus/Options Comments Mod Fltx RF_Syn Mod Flt0 through Mod Flt9. Data_Clk MM/DD/YY TClk_Syn HH/MM/SS I-Channl Q-Channl AGC_levl Module Dmd Fltx C_Detect Dmd Flt0 through Dmd Flt9. RF_Syn MM/DD/YY Data_Clk...
Page 310 Trojan Interface SDM-650B Satellite Modem G.5.2 Menu Explanations Note: Only the differences between the standard front panel menus and the Trojan interface menus are discussed in this section. G.5.2.1 Select Configuration Refer to Chapter 4 for explanations of menus and options.
Page 311 SDM-650B Satellite Modem Trojan Interface G.5.2.4 Select Stored Faults (StFaults) Refer to Chapter 4 for explanations of menus and options. G.5.2.5 Select Utility Refer to Chapter 4 for explanations of menus and options. Rev. 5 G–15...
Page 312 Trojan Interface SDM-650B Satellite Modem G.6 Remote Control Operation This section describes the remote control operation of the SDM-650B with the Trojan interface installed. • Firmware number: FW/0713-70A • Software version: 4.13T G.6.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232-C) serial communications link.
Page 313 SDM-650B Satellite Modem Trojan Interface G.6.1.1.1 Start Character A single character precedes all messages transmitted on the remote link. This character flags the start of a message. This character is: • “<” for commands • “>” for responses G.6.1.1.2 Device Address The device address is the address of the one satellite modem which is designated to receive a transmitted command, or which is responding to a command.
Page 314 Trojan Interface SDM-650B Satellite Modem G.6.2 Command/Response The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem receives a message addressed to it which does not match the established protocol or cannot be implemented, a negative acknowledgment message is sent in response.
Page 315 SDM-650B Satellite Modem Trojan Interface G.6.4 Configuration Commands/Responses G.6.4.1 Modulator G.6.4.1.1 Set Modulator Frequency Command: <add/MF_nnn.nnnn”cr” Response: >add/MF_nnn.nnnn”cr” RF_OFF”cr””lf”] Status Only: <add/MF_”cr” Response: >add/MF_nnn.nnnn”cr””lf”] Where: nnn.nnnn = 50.0000 to 90.0000 MHz. For the 140 MHz modulator, nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000 MHz.
Page 316 Trojan Interface SDM-650B Satellite Modem G.6.4.1.3 Modulator Rate The modulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and coder rate for each filter must be established upon initial modulator installation, and when circumstances indicate the need to do so.
Page 317 SDM-650B Satellite Modem Trojan Interface G.6.4.1.3.2 Select Modulator Rate Command: <add/SMRx_”cr” Response: >add/SMRx_”cr” RF_OFF”cr””lf”] Status Only: (See the MR command.) Where: x = A, B, C, or D (Filter designator). Notes: 1. Setting the modulator turns OFF the RF transmitter.
Page 318 Trojan Interface SDM-650B Satellite Modem G.6.4.1.3.5 Set Modulator Output Power Level Command: <add/MOP_snn.n”cr” Response: >add/MOP_snn.n”cr””lf”] Status Only: <add/MOP_”cr” Response: >add/MOP_snn.n”cr””lf”] Where: For the 140 MHz modulator, snn.n = +20.0 to -45.0, in 0.5 dB increments. For the 70 MHz modulator, snn.n = +20.0 to -30.0, in 0.5 dB increments.
Page 319 SDM-650B Satellite Modem Trojan Interface G.6.4.2 Demodulator G.6.4.2.1 Set Demodulator Frequency Command: <add/DF_nnn.nnnn”cr” Response: >add/DF_nnn.nnnn”cr””lf”] Status Only: <add/DF_”cr” Response: >add/DF_nnn.nnnn”cr””lf”] Where: For the 140 MGz modulator, nnn.nnnn = 50.0000 to 90.0000, and 100.0000 to 180.0000. G.6.4.2.2 Demodulator Rate The demodulator has four symbol rate filters. Each filter is for a specific symbol rate. The data rate and decoder rate for each filter must be established upon initial demodulator installation, and when circumstances indicate the need to do so.
Page 320 Trojan Interface SDM-650B Satellite Modem G.6.4.2.2.1 Demodulator Filter Rate Assignment Command: <add/ADRx_nnn_mmmm.m”cr” Response: >add/ADRx_nnn_mmmm.m”cr””lf”] Status Only: <add/ADRx_”cr” Response: >add/ADRx_nnn_mmmm.m”cr””lf”] Where: nnn = 1/2, 3/4, 7/8, or BP12 (Decoder rate). mmmm.m = 9.6 to 4080.0 (Data rate). Note: The parameters “nnn_mmmm.m” may be replaced by “N/A” to indicate “no assignment.”...
Page 321 SDM-650B Satellite Modem Trojan Interface G.6.4.2.3 Descramble Enable Command: <add/DE_xxx”cr” Response: >add/DE_xxx”cr””lf”] Status Only: <add/DE_”cr” Response: >add/DE_xxx”cr””lf”] Where: xxx = ON or OFF. G.6.4.2.4 IF Loopback Command: <add/IFL_xxx”cr” Response: >add/IFL_xxx”cr””lf”] Status Only: <add/IFL_”cr” Response: >add/IFL_xxx”cr””lf”] Where: xxx = ON or OFF.
Page 322 Trojan Interface SDM-650B Satellite Modem G.6.4.2.7 Fast Acquisition Mode This command is used to enable or disable fast acquisition and directed sweep modes of operation. When fast acquisition is enabled, the fast acquisition algorithm (requires hardware calibration) is used for acquisition of receive symbol rates of 128 kbit/s or lower. However, if the sweep range is set to less than 50 kHz, acquisition will be dictated by the directed sweep specifications and the fast acquisition algorithm will not be used.
Page 323 SDM-650B Satellite Modem Trojan Interface G.6.4.2.9 Sweep Width Range This command sets the overall travel of the sweep during acquisition. The sweep width may be set in the range of 0 to 50000 Hz. Command: <add/SWR_nnnnn”cr” Response: >add/SWR_nnnnn”cr””lf”] Status Only: <add/SWR_”cr”...
Page 324 Trojan Interface SDM-650B Satellite Modem G.6.4.3 Interface/Doppler Buffer G.6.4.3.1 Baseband Loopback Command: <add/BBL_xxx”cr” Response: >add/BBL_xxx”cr””lf”] Status Only: <add/BBL_”cr” Response: >add/BBL_xxx”cr””lf”] Where: xxx = ON or OFF. G.6.4.3.2 Transmit Clock Command: <add/TC_xxx”cr” Response: >add/TC_xxx”cr””lf”] Status Only: <add/TC_”cr” Response: >add/TC_xxx”cr””lf”] Where: xxx = REF (Reference) or EXT (External).
Page 325 SDM-650B Satellite Modem Trojan Interface G.6.4.3.5 Interface Reference Clock Command: <add/IRC_xxx”cr” Response: >add/IRC_xxx”cr””lf”] Status Only: <add/IRC_”cr” Response: >add/IRC_xxx”cr””lf”] Where: xxx = TXC (Transmit), RXC (Receive), EXT (External), or INT (Internal). G.6.4.3.6 Interface Buffer Center This command centers the Doppler buffer.
Page 326 Trojan Interface SDM-650B Satellite Modem G.6.4.4 System Commands/Responses G.6.4.4.1 Time of Day Command: <add/TIME_hh:mmxx”cr” Response: >add/TIME_hh:mmxx”cr””lf”] Status Only: <add/TIME_”cr” Response: >add/TIME_hh:mmxx”cr””lf”] Where: hh = hours. mm = minutes. xx = AM or PM. Example: Set modem 67 time to 10:45PM.
Page 327 SDM-650B Satellite Modem Trojan Interface G.6.4.4.3 Remote Configures the modem for remote operation. The modem will respond to any status request at any time. However, the modem must be in “Remote Mode” to change configuration parameters. Command: <add/REM_”cr” Response: >add/REM_”cr””lf”] G.6.4.4.4 Clear Stored Faults...
Page 328 Trojan Interface SDM-650B Satellite Modem G.6.4.5 Status Commands/Responses G.6.4.5.1 Configuration G.6.4.5.1.1 Modulator/Coder Configuration Status The Modulator/Coder configuration status command causes a block of data to be returned by the addressed modem. The block of data reflects the current configuration status of the Modulator/Coder.
Page 329 SDM-650B Satellite Modem Trojan Interface G.6.4.5.1.2 Modulator/Coder Configuration Program This command is used by the SMS-658 or SMS-758 M:N protection switch to collect information that is necessary to configure back-up modems. Command: <add/MCP_”cr” Response: >add/MCP_”cr” Modulator frequency MF_nnn.nnnn”cr” Modulator Power Offset MPO_snn.n”cr”...
Page 330 Trojan Interface SDM-650B Satellite Modem G.6.4.5.1.4 Demodulator/Decoder Configuration Program This command is used by the SMS-658 or SMS-758 M:N protection switch to collect information that is necessary to configure back-up modems. Command: <add/DCP_”cr” Response: >add/DCP_”cr” IF loopback (ON/OFF) IFL_xxx”cr” RF loopback (ON/OFF) RFL_xxx”cr”...
Page 331 SDM-650B Satellite Modem Trojan Interface G.6.4.5.2 Modem Faults Status (Summary) This command returns the current overall fault conditions of the modem. Command: <add/MFS_”cr” Response: >add/MFS_”cr” Demodulator (FLT/OK) DMD_xxx”cr” Modulator (FLT/OK) MOD_xxx”cr” Common Equipment (FLT/OK) CEQ_xxx”cr””lf”] G.6.4.5.3 Modulator Status The modulator status is returned as a block of data which indicates general status information.
Page 332 Trojan Interface SDM-650B Satellite Modem G.6.4.5.5 Common Equipment Status The common equipment status command causes a block of data to be returned which indicates the status of the common equipment. Command: <add/CES_”cr” Response: >add/CES_”cr” Monitor & Control Module (OK/FLT) M&C_xxx”cr”...
Page 333 SDM-650B Satellite Modem Trojan Interface G.6.4.5.6.2 Corrected BER Command: <add/CBER_”cr” Response: >add/CBER_nE-m”cr””lf”] Example: Request Corrected BER from modem 19. Command: <19/CBER_”cr” Response: CBER = 0.00002 errors/bit >19/CBER_2E-5”cr””lf”] Notes: 1. Corrected BER limits are lower < 1E-8, upper > 01E-3. 2. “No Data” is returned if no carrier is detected (decoder not locked).
Page 334 Trojan Interface SDM-650B Satellite Modem G.6.4.5.9 Demodulator Rate Command: <add/DR_”cr” Response: >add/DR_nnn_mmmm.m”cr””lf”] Where: nnn = 1/2, 3/4, 7/8, or BP12 (Coder rate). mmmm.m = 9.6 to 4080.0 (Data rate). Note: The parameters “nnn_mmmm.m” may be replaced by “N/A” to indicate “no assignment.”...
Page 335 SDM-650B Satellite Modem Trojan Interface G.6.4.5.12.1 Modulator Stored Faults Command: <add/MSF_#”cr” Response: >add/MSF_# hh:mm:ss MM/DD/YY”cr” Module missing or wont program (OK/FLT) MOD_xxx”cr” AGC leveled (OK/FLT) AGC_xxx”cr” Carrier synthesizer (OK/FLT) SYN_xxx”cr” Bit clock (OK/FLT) BCLK_xxx”cr” Transmit clock (OK/FLT) TCLK_xxx”cr” I-channel (OK/FLT) ICH_xxx”cr”...
Page 336 Trojan Interface SDM-650B Satellite Modem G.6.4.5.13 Bulk Consolidated Status This command causes bulk modem status to be returned. To reduce the length of the response, message parameter data are returned without identifiers. However, parameter identification can be determined by order of return. Each status parameter is terminated with a “,”...
Page 337 SDM-650B Satellite Modem Trojan Interface Parameter 15 (p15): Demodulator filter A assignment. p15 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s. Parameter 16 (p16): Demodulator filter B assignment. p16 = nnn_mmmm.m, where “nnn” is the code rate, and “mmmm.m” is the data rate in kbit/s.
Page 338 Trojan Interface SDM-650B Satellite Modem G.6.4.5.14 Bulk Consolidated Analog Status This command is similar to the “BCS_” command, but returns MODEM analog parameters. Command: <add/BCAS_”cr” Response: >add/BCAS_p1,p2,p3, . . . pn”cr””lf”] Where: pn = Parameter 1 (p1): Receive signal level.
Page 339 SDM-650B Satellite Modem Trojan Interface Character “c”: Demodulator fault status character 1. Bit 6 = 1 always. Bit 5 = Demodulator fault. Bit 4 = Carrier detect status (0 for decoder lock). Bit 3 through Bit 0 = Binary representation (0 to 10) of the number of demodulator stored faults.
Page 340 Trojan Interface SDM-650B Satellite Modem G.6.4.5.17 Equipment Type This command returns the equipment model number and M&C firmware version number. Command: <add/ET_”cr” Response: >add/ET_SDM650S_x.xxx”cr””lf”] Where: x.xxx = M&C firmware version. G–44 Rev. 5...
Page 341 Glossary The following is a list of acronyms and abbreviations that may be found in this manual. Acronym/ Definition Abbreviation Ω Ohms 16QAM 16 Quadrature Amplitude Modulation 8PSK 8 Phase Shift Keying Ampere Analog to Digital Alternating Current Analog to Digital Converter Adjust ADMA Amplitude Domain Multiple Access...
Page 342 Glossary SDM-650B Satellite Modem British Thermal Unit Backward Alarm or Bandwidth Bandwidth Ratio Celsius Carrier-to-Noise Ratio C/No Carrier-to-Noise Density Ratio CCITT International Telephone and Telegraph Consultative Committee CDMA Code Division Multiple Access Channel CHNL Channel Common Interface Circuit Carrier Loss...
Page 343 SDM-650B Satellite Modem Glossary Data Terminal Equipment E&M Ear and Mouth Bit Energy-to-Noise Ratio Emitter Coupled Logic Electronic Data Processing EEPROM Electrically-Erasable Programmable Read-Only Memory EFData Compatible Electronic Industries Association Electro-Magnetic Compatibility Electromotive Force EPROM Erasable Read-Only Memory Engineering Service Circuit or Engineering Service Channel...
Page 344 Glossary SDM-650B Satellite Modem Large Scale Integration (semiconductors) Mille (10 M&C Monitor and Control Milliamperes Maximum Mbit/s Megabits per second Monitor and Control Multiframe Sync Megahertz (10 Hertz) Minimum or Minute Modulator Modulated Output Power Microprocessor Controller Millisecond (10 second)
Page 345 SDM-650B Satellite Modem Glossary Receive (Receiver) RXCLK Receive Clock Receive Data Return-to-Zero Second Signal-to-Noise Ratio SCPC Single Channel Per Carrier Serial Clock Receive Serial Clock Transmit SCTE Serial Clock Transmit External Send Data Subframe Sync Satellite Multiservice System Signal-to-Noise Ratio...
Page 346 Glossary SDM-650B Satellite Modem This page is intentionally left blank. g–6 Draft Rev. 5...
Page 347: Metric Conversions
METRIC CONVERSIONS Units of Length Unit Centimeter Inch Foot Yard Mile Meter Kilometer Millimeter 1 centimeter — 0.3937 0.03281 0.01094 6.214 x 10 0.01 — — 1 inch 2.540 — 0.08333 0.2778 1.578 x 10 0.254 — 25.4 1 foot 30.480 12.0 —...
Page 348 2114 85281 WEST TH STREET TEMPE ARIZONA 480 • 333 • 2200 PHONE 480 • 333 • 2161...

Comtech EF Data SDM-650B Installation And Operation Manual

Table of Contents

Figures

Chapter 1. Introduction

Chapter 2. Installation

Chapter 3. Configuration

Chapter 4. Operation

Chapter 5. Theory of Operation

Chapter 6. Maintenance

Appendix A. Data Rates and Filters

Appendix B. Remote Control Operation

Appendix C. Field Compatibility

Appendix D. Software Change Instructions

Appendix E. Agc Interface

Appendix F. Asynchronous Overhead Channel Unit

Quick Links

Chapters

Related Manuals for Comtech EF Data SDM-650B

Summary of Contents for Comtech EF Data SDM-650B