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Comtech EF Data SDM-309B Installation And Operation Manual

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SDM-309B
SDM-309B
SDM-309B
SDM-309B
Satellite Modem
Satellite Modem
Satellite Modem
Satellite Modem
Installation and Operation Manual
Installation and Operation Manual
Installation and Operation Manual
Installation and Operation Manual
Part Number MN/SDM309B.IOM
Edition 2
February 29, 1992
Comtech EF Data is an ISO 9001 Registered Company

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Summary of Contents for Comtech EF Data SDM-309B

  • Page 1 Comtech EF Data is an ISO 9001 Registered Company SDM-309B SDM-309B SDM-309B SDM-309B Satellite Modem Satellite Modem Satellite Modem Satellite Modem Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Part Number MN/SDM309B.IOM...
  • Page 2 February 29, 1992 Special Instructions: This is the second edition of the manual. Copyright © Comtech EF Data, 2006 All rights reserved. Printed in the USA. Comtech EF Data, 2114 West 7th Street, Tempe, Arizona 85281 USA, (480) 333-2200, FAX: (480) 333-2161.

  • Page 3: Limitations Of Warranty

    Warranty Policy This Adaptive Broadband product is warranted against defects in material and workmanship for a period of one year from the date of shipment. During the warranty period, Adaptive Broadband will, at its option, repair or replace products that prove to be defective.

  • Page 4: About This Manual

    Adaptive Broadband Corporation to reflect its focus as a leading architect of the wireless broadband evolution. This manual provides installation and operation information for the Adaptive Broadband SDM-309B satellite modem. This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SDM-309B.
  • Page 5 Preface SDM-309B Satellite Modem Trademarks Product names mentioned in this manual may be trademarks or registered trademarks of their respective companies and are hereby acknowledged. Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated.

  • Page 6: Customer Support

    SDM-309B Satellite Modem Preface Customer Support Contact the Adaptive Broadband 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 Adaptive Broadband Customer Support representative may be reached at:...
  • Page 7 Preface SDM-309B Satellite Modem This page is intentionally blank. Rev. 0...

  • Page 8: Table Of Contents

    Table of Contents CHAPTER 1. INTRODUCTION...................1–1 1.1 Scope ................................. 1–1 1.2 Purpose And Function ............................. 1–1 1.3 Description................................ 1–1 1.4 System Specification ............................1–7 CHAPTER 2. INSTALLATION ..................2–1 2.1 Unpacking ................................. 2–1 2.2 External Connections............................2–1 2.2.1 Data I/O ..............................2–4 2.2.2 Remote (J6) ..............................
  • Page 9 Table of Contents SDM-309B Satellite Modem 3.1.4.1 MOD Configuration ..........................3–4 3.1.4.2 DEMOD Configuration ........................3–5 3.1.4.3 Interface Configuration ........................3–8 3.1.5 Monitor ..............................3–10 3.1.6 Faults ................................ 3–10 3.1.6.1 Mod_Flts - Modulator Faults......................3–11 3.1.6.2 Dmd_Flts - Demodulator/Decoder Faults ..................3–11 3.1.6.3 CEQ_Flts - Common Equipment Faults....................
  • Page 10 SDM-309B Satellite Modem Table of Contents 4.2.1.8 IBS Interface Specification........................ 4–15 4.2.1.9 IBS Interface Breakout Panel ......................4–17 4.2.1.9.1 IBS Terrestrial Interface (J1) ..................... 4–19 4.2.1.9.2 RS422 Interface (J2) ........................4–19 4.2.1.9.3 V.35 Interface (J3) ........................4–20 4.2.1.9.4 Engineering Service Channel..................... 4–20 4.2.1.9.5 G.703 Interface (J5) ........................
  • Page 11 Table of Contents SDM-309B Satellite Modem CHAPTER 5. THEORY OF OPERATION ..............5–1 5.1 Modulator ................................. 5–1 5.1.1 General description............................. 5–1 5.1.2 Specifications.............................. 5–1 5.1.3 Theory of Operation ........................... 5–6 5.2 Viterbi Decoder / Demodulator Processor ..................... 5–7 5.2.1 General Description ............................ 5–7 5.2.2 Viterbi Decoder/Demod Processor Specification ..................
  • Page 12 SDM-309B Satellite Modem Table of Contents 6.6 Repacking For Shipment..........................6–22 APPENDIX A. DATA RATES AND FILTERS ............A–1 APPENDIX B. SATELLITE MODEM REMOTE CONTROL........B–1 APPENDIX C. EXTERNAL CHANNEL UNIT............. C–1 APPENDIX D. SOFTWARE CHANGE SPECIFICATIONS........D–1 Rev. 0...
  • Page 13 Table of Contents SDM-309B Satellite Modem This page is intentionally blank. Rev. 0...

  • Page 14: Chapter 1. Introduction

    INTRODUCTION 1.1 Scope This manual describes the SDM-309B Satellite Modem, hereinafter referred to as the modem (Figure 1-1). It includes installation, operation, and maintenance instructions. A description of the equipment is contained in Section 1. Section 2 provides the installation instructions.
  • Page 15 Introduction SDM-309B Satellite Modem the modem are located on the front panel. The chassis also contains the power supply, and a fan is on the rear panel. A system block diagram is shown in Figure 1-4. 1-1–2 MN/U-SDM309B Rev. #...
  • Page 16 SDM-309B Satellite Modem Introduction Figure 1-1 SDM-309B Modem MN/U-SDM309B Rev. # 1-1–3...
  • Page 17 Introduction SDM-309B Satellite Modem Figure 1-2 Satellite Communications System With SDM-309B Modem 1-1–4 MN/U-SDM309B Rev. #...
  • Page 18 SDM-309B Satellite Modem Introduction Figure 1-3 Modular Construction MN/U-SDM309B Rev. # 1-1–5...
  • Page 19 Introduction SDM-309B Satellite Modem Figure 1-4 SDM-309B Block Diagram 1-1–6 MN/U-SDM309B Rev. #...

  • Page 20: System Specification

    Table 6-3 for more information on the options available for each board. *Older versions of the Viterbi Decoder board can also be used in the SDM-309B modem. Refer to Chapter 5, Section 5.2 for more information on the available revisions and compatibility information.
  • Page 21 Introduction SDM-309B Satellite Modem Forward Error Correction Convolutional Encoding with Soft Decision K7 Viterbi Decoding Data Scrambling Selectable, Synchronous (Per IESS-309 Rev 3 Section 4.4.5) or None Diagnostic Features RF Loopback Digital Data Loopback Fault Monitoring Bit Error Rate Monitoring...
  • Page 22 SDM-309B Satellite Modem Introduction Configuration Retention Will Maintain Current Configuration for 30 days Minimum Without Power Addressing Programmable to 1 of 256 Possibilities Address 0 Reserved for Global Addressing Local Control of All Remote Functions Included Via Pushbutton Entry. Table 1-2 BER Performance Specification...
  • Page 23 Introduction SDM-309B Satellite Modem Figure 1-5 Typical Bit Error Rate Performance 1-1–10 MN/U-SDM309B Rev. #...
  • Page 24 SDM-309B Satellite Modem Introduction Figure 1-6 SDM-309B Modem Typical Output Spectrum MN/U-SDM309B Rev. # 1-1–11...
  • Page 25 Introduction SDM-309B Satellite Modem 1-1–12 MN/U-SDM309B Rev. #...

  • Page 26: Chapter 2. Installation

    Chapter 2. INSTALLATION 2.1 Unpacking The modem and manuals are packaged in pre-formed reusable foam inside a cardboard carton. To remove the modem proceed as follows: Do not use any cutting edged tool that will extend more than one inch into the container and cause damage to the modem CAUTION a.
  • Page 27 Installation SDM-309B Satellite Modem FAULT 9 PIN "D" 2.2.3 FORM C FAULT RELAY CONTACTS IF OUTPUT 2.2.4 TX IF OUTPUT IF INPUT 2.2.5 RX IF INPUT AC POWER NONE STANDARD 2.2.6 AC POWER INPUT NONE #10-32 STUD 2.2.7 CHASSIS GROUND 2-2–2...
  • Page 28 SDM-309B Satellite Modem Installation Figure 2-1 Rear Panel View MN/U-SDM309B Rev. # 2-2–3...

  • Page 29: Data I/O

    Installation SDM-309B Satellite Modem 2.2.1 Data I/O For information and pinouts on the data connectors, please refer to the appropriate subSection in Section 4.2 and Appendix C. 2.2.2 Remote (J6) The remote connector on the modem is used to interface the Monitor and Control functions to a remote location.

  • Page 30: If Output (Cp1)

    SDM-309B Satellite Modem Installation COMMON EQUIPMENT IS FAULTED MODULATOR IS OK MODULATOR IS FAULTED DEMODULATOR IS OK DEMODULATOR IS FAULTED Note: A connection between the common (COM) and normally open (NO) contacts indicates no fault. 2.2.4 IF Output (CP1) This is the transmit IF connector. The output impedance is 75 ! and the output power level is -5 to -15dBm.

  • Page 31: System Installation

    Installation SDM-309B Satellite Modem (Operation Mode). Enter the menu and select TX only. This will mask the receive faults and receive stored faults in the faults menu. For a RX only system, the modulator (0773-X) is removed. Enter the Utility Menu on the front panel and select OP MODE).

  • Page 32: Chapter 3. Operation

    Chapter 3. OPERATION 3.1 SDM 309/M1200P Front Panel 3.1.1 General The following is a Step by Step explanation and procedure for operating the SDM 309B modem, hereafter referred to as the modem, with an internal IBS channel unit. The complete front panel operation is described below. The Modem front panel (Figure 3-1) provides the local user interface which is necessary to configure and monitor status of the satellite modem.

  • Page 33: Front Panel Controls

    Operation SDM-309B Satellite Modem Test Mode (Yellow LED) Flashes when the modem is in a test configuration. 3.1.3 Front Panel Controls The Modem is locally operated by using the front panel key-pad (Figure 3-1). The key- pad consists of six keys: Enter, Clear, Right Arrow, Left Arrow, Up Arrow, and Down Arrow.
  • Page 34 SDM-309B Satellite Modem Operation Figure 3-1 Front Panel View MN/U-SDM309B Rev. # 3–3...

  • Page 35: Configuration

    Operation SDM-309B Satellite Modem 3.1.4 Configuration Modem configuration may be viewed or changed by entering the “CONFIG” level from the ‘sELECT” menu on the front panel. After entering the “CONFIG” menu, use the right and left arrow keys to select “MOD”, “DEMOD”, or “INTERFACE” configuration.

  • Page 36: Demod Configuration

    SDM-309B Satellite Modem Operation TX_Power Programs the modulator output power level from -5 dB to -30 dBm in .5 dB Steps. On entry the current transmitter power level is displayed with the flashing cursor on the first character. The up and down keys are used to increase or decrease the output power level in .5 dBm Steps.
  • Page 37 Operation SDM-309B Satellite Modem Receiver rate selection. Select one of four predefined 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 one. The data rate is displayed on line two.
  • Page 38 SDM-309B Satellite Modem Operation SWP-RACQ Programs the sweep reacquisition mode time duration. The time selected with this parameter is the time that the modem will remain in a narrow sweep (± 10%) after acquisition has been accomplished. After this timer runs out the modem will return to the normal sweep.

  • Page 39: Interface Configuration

    Operation SDM-309B Satellite Modem 3.1.4.3 Interface Configuration TX_clock Programs the clock source for the modem transmitter clock. “Internal” sets the TX clock to operate from the modem internal clock, this is also the fallback clock. “External” sets the TX clock to operate from the external reference clock.
  • Page 40 SDM-309B Satellite Modem Operation CODING Programs the modem for “AMI”, “B8ZS”, “B6ZS”, or “HDB3” coding of the baseband data. On entry the current coding format is displayed. Use the arrow keys to select the desired coding format. Press the “ENTER” key to execute the change.

  • Page 41: Monitor

    Operation SDM-309B Satellite Modem 3.1.5 Monitor When the “MONITOR” level is entered use the right and left arrow keys to select the desired monitor function. Each monitor function is displayed in real time as long as it is selected. Raw_BER - Raw bit error rate.

  • Page 42: Mod_Flts - Modulator Faults

    SDM-309B Satellite Modem Operation 3.1.6.1 Mod_Flts - Modulator Faults RF_Syn Modulator RF synthesizer fault. Data_Clk Transmit data clock activity indicator. TClk_Syn Transmit clock synthesizer fault. I-Channl I channel activity fault. Q-Channl Q channel activity fault. AGC_level Automatic gain control level fault.

  • Page 43: Stored Faults

    Operation SDM-309B Satellite Modem Data/AIS Data or Alarm Indication Signal. When Data_FLT is selected in the Interface Configuration menu the fault indicates a Data stable condition. When AIS is selected, the fault indicates data is all 1’s. Refer to Section 4.3 (Interface Configuration for a detailed description of these faults.
  • Page 44 SDM-309B Satellite Modem Operation After entering the “UTILITY” functions level use the right and left arrow keys to select the utility function of interest. The current time and date can be displayed and changed as required. Access to the transmitter and receiver Data/Code Rate assignment and the lamp test functions are also available from within the utility functions level.
  • Page 45 Operation SDM-309B Satellite Modem OP MODE Operation Mode. Programs the modem operation for TX only, RX only, or Duplex operation. On entry the flashing cursor is on the first character of the display. Use the arrow keys to select TX only, RX only, or Duplex.
  • Page 46 SDM-309B Satellite Modem Operation Assign RX_Fltrs Receive filter display/assignment utility. Used to view current filter rate assignments and to make filter rate reassignments. Refer to the previous text under “Assign TX_Fltrs”. The receive filters assignments are basically identical. MN/U-SDM309B Rev. #...
  • Page 47 Operation SDM-309B Satellite Modem Figure 3-2 Menu Tree 3–16 MN/U-SDM309B Rev. #...
  • Page 48 SDM-309B Satellite Modem Operation Figure 3-3 Menu Tree MN/U-SDM309B Rev. # 3–17...
  • Page 49 Operation SDM-309B Satellite Modem Figure 3-4 Menu Tree 3–18 MN/U-SDM309B Rev. #...
  • Page 50 SDM-309B Satellite Modem Operation Figure 3-5 Menu Tree MN/U-SDM309B Rev. # 3–19...
  • Page 51 Operation SDM-309B Satellite Modem Figure 3-6 Menu Tree 3–20 MN/U-SDM309B Rev. #...
  • Page 52 SDM-309B Satellite Modem Operation Figure 3-7 Menu Tree MN/U-SDM309B Rev. # 3–21...
  • Page 53 Operation SDM-309B Satellite Modem Figure 3-8 IF Loopback 3–22 MN/U-SDM309B Rev. #...
  • Page 54 SDM-309B Satellite Modem Operation Figure 3-9 RF Loopback MN/U-SDM309B Rev. # 3–23...
  • Page 55 Operation SDM-309B Satellite Modem Figure 3-10 Interface Loopback 3–24 MN/U-SDM309B Rev. #...
  • Page 56 SDM-309B Satellite Modem Operation Figure 3-11 Baseband Loopback MN/U-SDM309B Rev. # 3–25...

  • Page 57: Drop And Insert Front Panel Operation

    Operation SDM-309B Satellite Modem 3.2 Drop And Insert Front Panel Operation 3.2.1 General The following is a Step by Step explanation and procedure for operating the SDM 309B modem, hereafter referred to as the modem, with an internal drop and insert channel unit.

  • Page 58: Mod Configuration

    SDM-309B Satellite Modem Operation 3.2.2.1 MOD Configuration Transmitter rate selection. Select one of four predefined 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 one. The data rate is displayed on line two.

  • Page 59: Demod Configuration

    Operation SDM-309B Satellite Modem CW_Mode *Programs the modem for continuous wave mode. Three modes of operation are available: center, dual, and offset modes. Center Mode: Generates a carrier at the current modulator frequency. This can be used to measure the output power and output frequency.
  • Page 60 SDM-309B Satellite Modem Operation IFLoopBk *Programs the modem for IF loopback operation. When the IF loopback is turned on the demodulator input is connected to the modulator output through an attenuator and the demodulator is programmed to the same frequency as the modulator. An attenuator within the modem connects the IF out to the IF in.

  • Page 61: Interface Configuration

    Operation SDM-309B Satellite Modem **SWP_DIR Programs the direction of the sweep travel in the directed sweep mode. On entry the current programmed setting is displayed with the flashing cursor on the first character. Use the arrow keys to select Forward (+) or Reverse (-).
  • Page 62 SDM-309B Satellite Modem Operation BBLoopBk *Programs the modem for baseband loopback operation. When baseband loopback is turned on insert data is looped back on the customer side of the interface. Note: The drop data is hard wired into loopback causing the BBLoopBk function to affect only the insert data.
  • Page 63 Operation SDM-309B Satellite Modem TXD_FLT Transmit Data Fault. This configuration function is used to select a Transmit Interface fault monitor of AIS, Data, or none. When AIS (Alarm Indication Signal) is selected the TX_INTF (Transmit Interface) fault “Data/AIS” is monitoring a fault condition of all 1’s from customer data input to the modem.
  • Page 64 SDM-309B Satellite Modem Operation DRP_DATA This configuration is used to select the desired drop data channel signaling. The choices are E1CCS (E1 Common Channel Signaling), E1CAS (E1 Channel Associated Signaling), E1_IBS, T1_IBS, E1_31_TS, T1 (T1 data signal), and T1ESF (T1 Extended Super Frame).

  • Page 65: Monitor

    Operation SDM-309B Satellite Modem INSERT CHANNELS Programs the Satellite bearer channels into the desired Terrestrial frame slot from 1 to 31 for E1CCS, E1_31_TS, and E1CAS and from channels 1 to 24 for T1 and T1ESF. Note: The number of Satellite bearer channels is data rate dependent.

  • Page 66: Faults

    SDM-309B Satellite Modem Operation * Range: <1.0E-8 to >1E-3 Swp_Freq - Sweep Monitor** *Range: -25,000 Hz to +25,000 Hz Eb/N0 - Energy(bit)/noise ratio. * Range: <3.2dB to >16.0 dB RxSignal - Receive signal level. * Range: <-60 dBm to >-30 dBm FIL_STAT - Plesiochronous buffer fill status in percent.

  • Page 67: Dmd_Flts - Demodulator/Decoder Faults

    Operation SDM-309B Satellite Modem 3.2.4.2 Dmd_Flts - Demodulator/Decoder Faults C_Detect Carrier detect fault. Indicates that the decoder is not locked. RF_Syn Demodulator RF synthesizer fault. Data_Clk Receive data clock activity fault. I-Channl I channel activity fault. Q-Channl Q channel activity fault.

  • Page 68: Utility

    SDM-309B Satellite Modem Operation The Modem stores the first ten (Flt0 - 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. Stored faults may be viewed by entering the ‘stFaults” level from the ‘sELECT”...
  • Page 69 Operation SDM-309B Satellite Modem Time Time of day set/display function. The current time that the modem is set for is displayed when selected. To set the modem time press the “ENTER” key and use the right and left arrow keys to position the flashing cursor over the parameter to be changed.
  • Page 70 SDM-309B Satellite Modem Operation Filter Adjust This is a factory setting and the operator is not allowed to enter this parameter without authorization from EFData service department. Failure to comply will result in a modem failure. Assign TX_Fltrs Transmit filter display/assignment utility. Used to view current filter rate assignments and to make filter rate reassignments.
  • Page 71 Operation SDM-309B Satellite Modem Figure 3-12 Menu Tree 3–40 MN/U-SDM309B Rev. #...
  • Page 72 SDM-309B Satellite Modem Operation Figure 3-13 Menu Tree MN/U-SDM309B Rev. # 3–41...
  • Page 73 Operation SDM-309B Satellite Modem Figure 3-14 Menu Tree 3–42 MN/U-SDM309B Rev. #...
  • Page 74 SDM-309B Satellite Modem Operation Figure 3-15 Menu Tree MN/U-SDM309B Rev. # 3–43...
  • Page 75 Operation SDM-309B Satellite Modem Figure 3-16 Menu Tree 3–44 MN/U-SDM309B Rev. #...
  • Page 76 SDM-309B Satellite Modem Operation Figure 3-17 Menu Tree MN/U-SDM309B Rev. # 3–45...
  • Page 77 Operation SDM-309B Satellite Modem 3–46 MN/U-SDM309B Rev. #...

  • Page 78: Chapter 4. M&C And Interfaces

    Chapter 4. M&C AND INTERFACES 4.1 Monitor And Control 4.1.1 General The Modem uses a sophisticated microcontroller module to perform the monitor and control functions of the modem. This module is referred to as the Monitor & Control (M&C) (Figure 4-1). The M&C monitors the modem and provides configuration updates to other modules within the modem when necessary.
  • Page 79 M&C and Interfaces SDM-309B Satellite Modem RS-232C Configuration: To configure the M&C for RS-232C operation. Install jumpers JP4, JP5 and JPX. Remove jumpers JP1, JP2, and JP3. Connect JP7 to RS232 4-4–2 MN/U-SDM309B Rev. #...
  • Page 80 SDM-309B Satellite Modem M&C and Interfaces Figure 4-1 Monitor & Control Card MN/U-SDM309B Rev. # 4-4–3...

  • Page 81: Remote Baud Rate

    M&C and Interfaces SDM-309B Satellite Modem 4.1.2.2 Remote Baud Rate The remote communications baud rate and parity is programmed by a switch pack (SP1) on the M&C module. Programming the baud rate and parity is accomplished by setting the switches. The switches are individually set in the OFF or ON positions. A switch is programmed “OFF”...

  • Page 82: Modulator/Coder Defaults

    SDM-309B Satellite Modem M&C and Interfaces 2. If the battery backed RAM failed the valid data test the modulator, demodulator, and interface modules would be tested to determine if valid configuration information was retained by them. If valid configuration information was retained by a module, that module’s configuration will be stored in the battery...

  • Page 83: Utility Defaults

    M&C and Interfaces SDM-309B Satellite Modem INTF_LBk Interface Loop Back [OFF] Coding [AMI] TX_2047 [OFF] TXD_Flt [NONE] RXD_Flt [NONE] Buf_Size [384] Read_ERR [FRAME] Dscrmblr Descrambler [ON] Scramblr Scrambler [ON] 4.1.2.8 Utility Defaults POW ADJ Power Adjust [-5.0 dBm] OP MODE...

  • Page 84: Ibs/M1200P Interface

    SDM-309B Satellite Modem M&C and Interfaces 4.2.1 IBS/M1200P Interface 4.2.1.1 Functional Description The IBS Interface module (Figure 4-2) consists of two PWB’s that are married together. The two assembly numbers are AS/1010 and AS/1011. Figure 4-3 is a block diagram of the IBS/M1200P Channel Unit.
  • Page 85 M&C and Interfaces SDM-309B Satellite Modem reference clock generated in the modem. The interface will automatically select the internal clock if it detects a problem with the customer selected clock. A fault will be signaled if this happens. 4-4–8 MN/U-SDM309B Rev. #...
  • Page 86 SDM-309B Satellite Modem M&C and Interfaces Figure 4-2 IBS Interface Module MN/U-SDM309B Rev. # 4-4–9...
  • Page 87 M&C and Interfaces SDM-309B Satellite Modem Figure 4-3 IBS Interface Block Diagram 4-4–10 MN/U-SDM309B Rev. #...
  • Page 88 SDM-309B Satellite Modem M&C and Interfaces Figure 4-4 IBS Fault Tree MN/U-SDM309B Rev. # 4-4–11...
  • Page 89 M&C and Interfaces SDM-309B Satellite Modem Figure 4-5 Jumper Table 4-4–12 MN/U-SDM309B Rev. #...

  • Page 90: Receive Multiplexer

    SDM-309B Satellite Modem M&C and Interfaces The transmit data will be replaced with an all ones pattern (Alarm Indication Signal or AIS) in the event of certain failures, per IESS-309. The modem will transparently pass an incoming AIS signal but can signal that this is happening if interrogated from the front panel or remotely through the M&C Interface.

  • Page 91: Engineering Service Channel (Esc)

    M&C and Interfaces SDM-309B Satellite Modem activity on either the TX Terrestrial clock or the external clock (if selected) will substitute Satellite clock and a fault will be signaled. 4.2.1.6 Engineering Service Channel (ESC) The engineering service channel (ESC) is fully compliant with IESS 309 Rev. 2 for serial Data Rates as defined in Section 2.1.

  • Page 92: Ibs Interface Specification

    SDM-309B Satellite Modem M&C and Interfaces TERRESTRIAL TX DATA TERESTXDAT ENGINEERING SERVICE CHANNEL RXESCDAT RS-422/V.35 RECEIVE TIMING SCR/RTA SCR/RTB RS-422/V.35 TRANSMIT TIMING SCT/STA SCT/STB RS422/V.35 TERMINAL TIMING SCTE/TTA SCTE/TTB RS422 TRANSMIT OCTET R422TXOA R422TXOA RS422 RECEIVE OCTET R422RXOA R422RXOB RS422/V.35 REQUEST TO SEND...
  • Page 93 M&C and Interfaces SDM-309B Satellite Modem RS-232 Specification Circuit Supported RD, TD, DSR, RTS, CTS Amplitude (RD, RTS) True: 14 V ± 11 V False: -14 V ± 11 V Amplitude (TD, DSR, CTS) True: 11 V ± 2 V False: -11 V ±...

  • Page 94: Ibs Interface Breakout Panel

    SDM-309B Satellite Modem M&C and Interfaces 4.2.1.9 IBS Interface Breakout Panel The IBS Breakout Panel supports the use of the SDM-309 modem with an IBS/M1200P Channel Unit. Connections between the breakout panel and other equipment are made through front and rear panel connectors. These connectors are listed in Table 4-1. The location of these connectors are shown in Figure 4-6.
  • Page 95 M&C and Interfaces SDM-309B Satellite Modem Figure 4-6 IBS Break-Out Panel 4-4–18 MN/U-SDM309B Rev. #...

  • Page 96: Ibs Terrestrial Interface (J1)

    SDM-309B Satellite Modem M&C and Interfaces 4.2.1.9.1 IBS Terrestrial Interface (J1) The IBS terrestrial interface is provided on a 50 pin female "D" connector accessible from the rear of the breakout panel. Screw locks are provided for mechanical security of the mating connector.

  • Page 97: Interface (J3)

    M&C and Interfaces SDM-309B Satellite Modem GROUND 1, 19, 20, 37 TX OCTET TXO-A TXO-B SEND DATA SD-A SD-B SEND TIMING ST-A ST-B RECEIVE DATA RD-A RD-B RECEIVER TIMING RT-A RT-B EXTERNAL CLOCK EXC-A EXC-B REQUEST TO SEND RTS-A RST-B...

  • Page 98: Interface (J5)

    SDM-309B Satellite Modem M&C and Interfaces The engineering service channel is provided on a 25 pin “D” female connector assessable from the front panel of the breakout panel. Screw locks are provided for mechanical security of the mating connector. Signal Function...

  • Page 99: Receive Data (J8)

    M&C and Interfaces SDM-309B Satellite Modem 4.2.1.9.8 Receive Data (J8) This connector is the interface for the unbalanced Receive Data input. To activate this connector SW3 must be in the UNBAL position. If the balanced Send Data input is to be used, SW3 must be in the BAL position.
  • Page 100 SDM-309B Satellite Modem M&C and Interfaces Figure 4-7 IBS Interface Breakout Panel Schematic Diagram MN/U-SDM309B Rev. # 4-4–23...

  • Page 101: Drop & Insert Interface

    M&C and Interfaces SDM-309B Satellite Modem 4.2.2 Drop & Insert Interface 4.2.2.1 Functional Description The IDR Drop & Insert Interface module (Figure 4-8) consists of two PWBs that are married together. The two assembly numbers are AS/1010 and AS/1455. Figure 4-9 is a block diagram of the Drop &...

  • Page 102: Data Interface

    SDM-309B Satellite Modem M&C and Interfaces 4.2.2.2 Data Interface The module contains transformer balanced data interfaces supporting CCITT G.703 parameters, (compatible with AT&T DSI service) and de-jitter. Data inputs are named Drop Send Data Input A and B (DSD-A and DSD-B) and Insert Send Data Input A and B (ISD-A and ISD-B).

  • Page 103: Plesiochronous Buffer

    M&C and Interfaces SDM-309B Satellite Modem indicated by interrogating the modem and by a green Light Emitting Diode (LED) on the Interface, and is fed into the receive fault tree per IESS-308. Under certain fault conditions defined by IESS-308 the receive user data will be replaced by an all ones pattern.
  • Page 104 SDM-309B Satellite Modem M&C and Interfaces of the events which cause a secondary alarm. The modem may be interrogated from the front panel or using the RS-485 or RS-232 interface to identify the cause of the alarm. MN/U-SDM309B Rev. #...
  • Page 105 M&C and Interfaces SDM-309B Satellite Modem Figure 4-8 Drop and Insert Channel Unit 4-4–28 MN/U-SDM309B Rev. #...
  • Page 106 SDM-309B Satellite Modem M&C and Interfaces Figure 4-9 Drop and Insert Block Diagram MN/U-SDM309B Rev. # 4-4–29...
  • Page 107 M&C and Interfaces SDM-309B Satellite Modem Figure 4-10 Drop & Insert Fault Tree 4-4–30 MN/U-SDM309B Rev. #...
  • Page 108 SDM-309B Satellite Modem M&C and Interfaces Figure 4-11 Drop & Insert Jumper Table MN/U-SDM309B Rev. # 4-4–31...

  • Page 109: Drop & Insert Interface Connector Pinouts

    M&C and Interfaces SDM-309B Satellite Modem 4.2.2.8 Drop & Insert Interface Connector Pinouts The D&I 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 110 SDM-309B Satellite Modem M&C and Interfaces Satellite Data Rates Supported N x 64 Kb/s, N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20 r 24 (T1) N = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24,...

  • Page 111: Drop & Insert Breakout Panel

    M&C and Interfaces SDM-309B Satellite Modem 4.2.2.10 Drop & Insert Breakout Panel The Drop and Insert Breakout Panel supports the use of the drop and insert channel unit in the SDM-309 modem. Connections between the breakout panel and other equipment are made through front and rear panel connectors.
  • Page 112 SDM-309B Satellite Modem M&C and Interfaces Figure 4-12 Drop and Insert Break-Out Panel MN/U-SDM309B Rev. # 4-4–35...

  • Page 113: Drop Data Input, Insert Data Output, And Ext. Ref Clk (J1)

    M&C and Interfaces SDM-309B Satellite Modem 4.2.2.10.1 Drop Data Input, Insert Data Output, and Ext. Ref Clk (J1) The Drop Data Input, Insert Data Output, and External Reference Clock balanced signals are provided on a 15 pin “D” female connector accessible from the front of the break-out panel.

  • Page 114: Insert Data Output (J4)

    SDM-309B Satellite Modem M&C and Interfaces Note: The balanced insert data input signals on J3 are selected by SW2. Refer to Section 4.2.2.11.3 for further balanced insert data signal selection information. 4.2.2.10.4 Insert Data Output (J4) The balanced Insert Data Output is provided on a 15 pin female "D" connector and is located on the front of the break-out panel.

  • Page 115: Esc Channel (J10)

    M&C and Interfaces SDM-309B Satellite Modem This connector is the interface for the unbalanced external reference clock input. The unbalanced external reference clock signal on J9 is selected by SW3. Refer to Section 4.2.2.11.5 for further information on selection of the balanced or unbalanced external reference clock signal.

  • Page 116: Rear Panel Switches

    SDM-309B Satellite Modem M&C and Interfaces DROP DATA OUTPUT DDO-A DDO-B TERRESTRIAL TX DATA TER_TXDAT TERRESTRIAL RX DATA TER_RXDAT INSERT DATA INPUT IDI-A IDI-B PRIMARY COMMON PRI_COM PRIMARY NORMALLY OPEN PRI_NO PRIMARY NORMALLY CLOSED PRI_NC SECONDARY COMMON SEC_COM SECONDARY NORMALLY OPEN...

  • Page 117: Insert Data Output

    M&C and Interfaces SDM-309B Satellite Modem 4.2.2.11.4 Insert Data Output The insert data output signal has two outputs. The BNC connector has the unbalanced output signal and the DB15 connector has the balanced output signal. To use the BNC connector output, SW2 position 5 & 6 must be closed (close to PCB) and SW2 position 7 &...
  • Page 118 SDM-309B Satellite Modem M&C and Interfaces Figure 4-13 Rear Panel Switch Diagram MN/U-SDM309B Rev. # 4-4–41...
  • Page 119 M&C and Interfaces SDM-309B Satellite Modem Table 4-3 Switch 1 Switch Position UNBALANCED DDI CLOSED CLOSED OPEN OPEN BALANCED DDI OPEN OPEN CLOSED CLOSED Switch Position UNBALANCED DDO CLOSED CLOSED OPEN OPEN BALANCED DDO OPEN OPEN CLOSED CLOSED Switch 2...
  • Page 120 SDM-309B Satellite Modem M&C and Interfaces Figure 4-14 Drop and Insert Schematic Diagram MN/U-SDM309B Rev. # 4-4–43...
  • Page 121 M&C and Interfaces SDM-309B Satellite Modem Figure 4-15 Drop & Insert Daughter Board Schematic Diagram 4-4–44 MN/U-SDM309B Rev. #...

  • Page 122: External Channel Unit Interface

    Refer to Appendix C for a complete description of the External Channel Unit Interface and system integration. This is an optional mode of operation, making the SDM-309B modem compatible with a variety of stand alone channel unit equipment for IBS service.

  • Page 123: Master/Slave G.703

    M&C and Interfaces SDM-309B Satellite Modem Modem Settings (Slave) TX_CLOCK TX_TERR BUF_CLK SATELITE RX_CLOCK NORMAL 4.3.1.2 Master/Slave G.703 * 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 retransmitting.

  • Page 124: Master/Master (Customer Clock)

    SDM-309B Satellite Modem M&C and Interfaces an exact frame length, causing minimum loss of data. By using very high stability clocks, the expected time between slips can be many days. Loss of the buffer clock will mean the buffer will not be emptied and no data will be available.

  • Page 125: Chapter 5. Theory Of Operation

    Chapter 5. THEORY OF OPERATION 5.1 Modulator 5.1.1 General description The modem Modulator card is a 10.25" x 14" card (Figure 5-1) that fits in the top left slot of the modem chassis. Its function is to create a QPSK modulated carrier within the 50 - 90 MHz or 100 - 180 MHz range from the digital data stream that is provided by the Interface card.
  • Page 126 Theory of Operation SDM-309B Satellite Modem Spurious and Harmonics -50 dBc minimum in band, 40 dBc minimum out of band Output Power Level Range -5 to-30 dBm Output Power Adjustment 0.5 dB Step Size Output Stability ± .5 dB over -5 to -25 dBm ±1 dB over -25 to -30 dBm...
  • Page 127 SDM-309B Satellite Modem Theory of Operation Figure 5-1 Modulator Card MN/U-SDM309B Rev. # 5-5–3...
  • Page 128 Theory of Operation SDM-309B Satellite Modem Figure 5-2 Modulator Block Diagram 5-5–4 MN/U-SDM309B Rev. #...
  • Page 129 SDM-309B Satellite Modem Theory of Operation Figure 5-3 Modulator Output Spectral Occupancy MN/U-SDM309B Rev. # 5-5–5...

  • Page 130: Theory Of Operation

    Theory of Operation SDM-309B Satellite Modem 5.1.3 Theory of Operation As mentioned in Section 5.1.1, the modulator is composed of eight basic subSections. SubSections 1-4 and 8 make up the baseband processing portion of the modulator while subSections 5-7 form the RF portion of the modulator.

  • Page 131: Viterbi Decoder / Demodulator Processor

    6.XX firmware in the M&C could be replaced with an 0949 board. But an 0949 board that has 4.XX firmware in the M&C could not be replaced with a 2133 board without upgrading the M&C firmware. All new SDM-309B modems will be shipped with the new 2133 Viterbi decoder boards.

  • Page 132: Viterbi Decoder Specifications

    Theory of Operation SDM-309B Satellite Modem Clock Phase Error ± 5% Clock Loop Bandwidth Software Controlled Clock Jitter 5% p to p Max 5.2.2.2 Viterbi Decoder Specifications Bit Error Rate See Figure 5-8 Maximum Data Rate 6.4 Mb/s (Rate 1/2) 9.5 Mb/s (Rate 3/4)
  • Page 133 SDM-309B Satellite Modem Theory of Operation Figure 5-4 Viterbi Decoder (AS/0701) MN/U-SDM309B Rev. # 5-5–9...
  • Page 134 Theory of Operation SDM-309B Satellite Modem Figure 5-5 Viterbi Decoder (AS/0949) 5-5–10 MN/U-SDM309B Rev. #...
  • Page 135 SDM-309B Satellite Modem Theory of Operation Figure 5-6 Viterbi Decoder (AS/2133) MN/U-SDM309B Rev. # 5-5–11...
  • Page 136 Theory of Operation SDM-309B Satellite Modem Figure 5-7 Viterbi Decoder Block Diagram 5-5–12 MN/U-SDM309B Rev. #...
  • Page 137 SDM-309B Satellite Modem Theory of Operation Figure 5-8 Typical Decoder BER Performance MN/U-SDM309B Rev. # 5-5–13...

  • Page 138: Theory Of Operation

    Theory of Operation SDM-309B Satellite Modem 5.2.3 Theory Of Operation 5.2.3.1 Demod Processor The Demod Processor, in conjunction with the Demodulator, reconstructs the digital data stream that was transmitted but corrupted by transmission channel impairments. The Demod Processor accepts 11 bit quantized signals from the Demodulator for both the I and Q channels.

  • Page 139: Demodulator

    SDM-309B Satellite Modem Theory of Operation 7/8 rate. The "de-puncture" pattern is the same as the "puncture pattern used in the encoder. A set of "branch metric" values is then computed for each of the received symbol pairs, related to the probability that the received symbol pair was actually transmitted as one of the four possible symbol pairs.

  • Page 140: Specifications

    Theory of Operation SDM-309B Satellite Modem 5.3.2 Specifications Demodulation Type QPSK Frequency Range 50 to 90 MHz or 100 to 180 MHz Frequency Select Method Synthesized Frequency Step Size 2.5 KHz Channel Spacing .7 Times the Data Rate Divided by the Encoding Rate.
  • Page 141 SDM-309B Satellite Modem Theory of Operation Figure 5-9 Demodulator Card MN/U-SDM309B Rev. # 5-5–17...
  • Page 142 Theory of Operation SDM-309B Satellite Modem Figure 5-10 Demodulator Block Diagram 5-5–18 MN/U-SDM309B Rev. #...

  • Page 143: Theory Of Operation

    SDM-309B Satellite Modem Theory of Operation 5.3.3 Theory of Operation As mentioned in Section 5.3.1, the Demodulator is composed of six basic subSections. The first three make up the RF portions of the board while the last three handle the baseband processing.

  • Page 144: Reacquisition

    Theory of Operation SDM-309B Satellite Modem 5.4.2 Reacquisition Normally the modem sweeps full range of plus/minus 30 KHz during acquisition. The time it takes to complete one full sweep cycle depends upon the symbol rate of the demod as follows: 1.

  • Page 145: Fast Acquisition

    SDM-309B Satellite Modem Theory of Operation 5.4.3 Fast Acquisition When Fast Acquisition is enabled the fast acquisition algorithm is used for acquisition of receive symbol rates of 128 Kbps or lower. If the sweep range is set to less than 50KHz, acquisition will be dictated by the directed sweep specifications and the fast acquisition algorithm will not be used.

  • Page 146: Chapter 6. Maintenance

    Chapter 6. MAINTENANCE 6.1 System Checkout 6.1.1 General The system checkout Section is to be used as an aid in setting up a modem within the earth station. There are tables for use in checking to see if the Eb/N0 is correct, typical output spectrum, and typical eye pattern and constellation pictures.
  • Page 147 Maintenance SDM-309B Satellite Modem an Eb/N0 of 7.5 dB. (S+N)/N is measured by taking the average level of the noise and the average level of the top of the modem spectrum as shown. Use this measurement for the first column on Table 6-1. Read across the page to find the S/N and Eb/N0 for the specific code rate.
  • Page 148 SDM-309B Satellite Modem Maintenance Figure 6-1 Typical Output Spectrum MN/U-SDM309B Rev. # 6-6–3...
  • Page 149 Maintenance SDM-309B Satellite Modem Figure 6-2 Output Spectrum With Noise 6-6–4 MN/U-SDM309B Rev. #...
  • Page 150 SDM-309B Satellite Modem Maintenance Table 6-1 EFDATA Corporation Conversion Of (S+N)/N TO S/N And Eb/N0 For Various Code Rates (dB) Code Rate 1/2 Code Rate 3/4 Code Rate 7/8 (S+N)/N Eb/N0 Eb/N0 Eb/N0 -0.6 10.0 10.5 10.1 10.1 10.1 10.1 11.0...
  • Page 151 Maintenance SDM-309B Satellite Modem Figure 6-3 Typical Eye Patterns 6-6–6 MN/U-SDM309B Rev. #...
  • Page 152 SDM-309B Satellite Modem Maintenance Figure 6-4 Typical Eye Constellations MN/U-SDM309B Rev. # 6-6–7...

  • Page 153: Test Points

    Maintenance SDM-309B Satellite Modem 6.1.4 Test Points The following is a list of front panel test points and a description or the signal that is to be present under normal operation. 6.1.4.1 Modulator (Figure 6-5) TPG1 Ground Q EYE Pattern Level is 2 V P-P.

  • Page 154: Demodulator (Figure 6-6)

    SDM-309B Satellite Modem Maintenance 6.1.4.2 Demodulator (Figure 6-6) TP10 VCXO Control Voltage Approximately 0 to +2.5V sweep range. TP23 Discriminator Voltage. Nominally +2.5V with 6 dB noise at 128 Kbs. Ground test point Q EYE pattern. Level is 1V P-P at the center of the eye crossing. The DC offset is about +2.4V.

  • Page 155: Viterbi Decoder/Demod Card As/0701 (Figure 6-7)

    Maintenance SDM-309B Satellite Modem 6.1.4.3 Viterbi Decoder/demod Card AS/0701 (Figure 6-7) Data Clock. Result of the data clock recovery loop in the demod processor Section. R0C Sign Bit. Result of the hard decision interface. 50% duty cycle random TTL data.

  • Page 156: Viterbi Decoder/Demod Card As/0949 (Figure 6-8)

    SDM-309B Satellite Modem Maintenance 6.1.4.4 Viterbi Decoder/Demod Card AS/0949 (Figure 6-8) Ground Test Point. Decoder Data. Data out of the decoder. Decoder Clock. Clock out of the decoder. Sync Error. Approximate raw error rate. Random TTL pulses. One pulse for every I channel or Q channel error.

  • Page 157: Viterbi Decoder/Demod Card As/2133 (Figure 6-9)

    Maintenance SDM-309B Satellite Modem 6.1.4.5 Viterbi Decoder/Demod Card AS/2133 (Figure 6-9) Ground Test Point. VIT LOCK Viterbi lock Result of the decoder and clock synchronization and AGC leveling. DATA CLK Data Clock. Result of the data clock recovery loop in the demod processor Section.

  • Page 158: Fault Isolation

    SDM-309B Satellite Modem Maintenance 6.2 Fault Isolation System faults are reported in the “FAULT” menu (Figure 3-3). Stored faults are reported in the ‘sTFAULTS” menu (Figures 3-4 through 3-6). The following list is to be used in isolating the problem and deciding the appropriate action to be taken.

  • Page 159: Demodulator Faults

    Maintenance SDM-309B Satellite Modem MODULE Modulator module fault. Indicates a problem in programming the modulator card. Check to see that the modulator card is present and is properly seated. If the modulator card is properly seated this could indicate a problem in the Monitor and Control (M&C) card or in the interface between...

  • Page 160: Common Equipment Faults

    SDM-309B Satellite Modem Maintenance 6.2.3 Common Equipment Faults Refer to Section 3.1.6.3, 3.2.5.3, and Figures 3-3 and 3-6 in the O&I manual. Fault Possible Problem And Action BATTERY M&C battery voltage fault. Indicates a low voltage in the memory battery.

  • Page 161: Transmit Overhead Framing Unit Faults

    Maintenance SDM-309B Satellite Modem 6.3.1 Transmit Overhead Framing Unit Faults Fault Possible Problem And Action DATA/AIS Data or Incoming Alarm Indication Signal. When AIS (Alarm Indication Signal) is selected the TX_INTF (Transmit Interface) fault “Data/AIS is monitoring a fault condition of all 1’s from customer data input to the modem.
  • Page 162 This fault is to be sent as a backward alarm to the distant end. This fault will occur when no carrier is present, but will probably never occur with a correct signal. Table 6-2 Programmable Data Rates For The EFData Variable Rate SDM-309B Modem 64.0 64.5 65.0 65.5 66.0...
  • Page 163 Maintenance SDM-309B Satellite Modem 144.5 145.0 145.5 146.0 146.5 147.0 147.5 148.0 148.5 149.0 149.5 150.0 150.5 151.0 151.5 152.0 152.5 153.0 153.5 154.0 154.5 155.0 155.5 156.0 156.5 157.0 157.5 158.0 158.5 159.0 159.5 160.0 160.5 161.0 161.5 162.0 162.5...
  • Page 164 SDM-309B Satellite Modem Maintenance 510.0 510.4 511.0 512.0 513.6 514.0 515.2 516.0 516.8 518.0 518.4 520.0 521.6 522.0 523.2 524.0 524.8 526.0 526.4 528.0 529.6 530.0 531.2 532.0 532.8 534.0 534.4 536.0 537.6 538.0 539.2 540.0 540.8 542.0 542.4 544.0 545.6...
  • Page 165 Maintenance SDM-309B Satellite Modem 1896.0 1900.0 1904.0 1908.0 1912.0 1916.0 1920.0 1924.0 1928.0 1932.0 1936.0 1940.0 1944.0 1948.0 1952.0 1956.0 1960.0 1964.0 1968.0 1972.0 1976.0 1980.0 1984.0 1988.0 1992.0 1996.0 2000.0 2004.0 2008.0 2012.0 2016.0 2020.0 2024.0 2028.0 2032.0 2036.0 2040.0...
  • Page 166 SDM-309B Satellite Modem Maintenance Figure 6-10 Rear View Without Cover MN/U-SDM309B Rev. # 6-6–21...

  • Page 167: Module Replacement

    Maintenance SDM-309B Satellite Modem 6.4 Module Replacement The modem cards are plug-in cards that can be replaced by removing the defective card and reinserting the replacement. There are card ejectors for use in removing the cards. On the interface card there are additional screws on the rear panel that need to be removed before the interface card is removed (refer to Figure 6-10).
  • Page 168 SDM-309B Satellite Modem Maintenance Table 6-3 EFData Part Numbers For Various Modules Modulators Base Part Number - AS/0773 OR AS/0773X Dash # Description SDM-308/9, Open network filtering SDM-308/9, Open network filtering, +5 dBm output Demodulators Base Part Number - AS/0778 OR AS/0778X...

  • Page 169: Appendix A. Data Rates And Filters

    Appendix A. DATA RATES AND FILTERS The SDM-309B modem will operate at data rates from 64 Kbps to 2.048 Mbps with variable rate filters or fixed rate filters. This appendix covers data rate change instructions for fixed rate and variable rate filters in Section 1.
  • Page 170 Data Rates and Filters SDM-309B Satellite Modem 8. With a phillips screwdriver, remove the four (4) screws holding down the daughter card. See Figure A-2 for location of the hardware. 9. Remove the daughter card (0698) from the demodulator. 10. Install the replacement daughter card (0698) so that J1 on the daughter card lines up with J2 on the demodulator card and J2 on the daughter card lines up with J3 on the demodulator card and all four hold down screws line up.
  • Page 171 SDM-309B Satellite Modem Data Rates and Filters Figure A-1 Modulator Filter Card Change MN/U-SDM309B Rev. # A–3...
  • Page 172 Data Rates and Filters SDM-309B Satellite Modem Figure A-2 Demodulator Filter Card Change A–4 MN/U-SDM309B Rev. #...
  • Page 173 SDM-309B Satellite Modem Data Rates and Filters Figure A-3 Fixed Rate Modulator Filter MN/U-SDM309B Rev. # A–5...
  • Page 174 Data Rates and Filters SDM-309B Satellite Modem Figure A-4 Fixed Rate Demodulator Filter A–6 MN/U-SDM309B Rev. #...
  • Page 175 SDM-309B Satellite Modem Data Rates and Filters Figure A-5 Variable Rate Modulator Filter MN/U-SDM309B Rev. # A–7...
  • Page 176 Data Rates and Filters SDM-309B Satellite Modem Figure A-6 Variable Rate Demodulator Filter A–8 MN/U-SDM309B Rev. #...
  • Page 177 SDM-309B Satellite Modem Data Rates and Filters MN/U-SDM309B Rev. # A–9...

  • Page 178: Appendix B. Satellite Modem Remote Control

    Appendix B. SATELLITE MODEM REMOTE CONTROL 1.0 Scope This document defines the protocol and command structure for remote control and status monitoring of the EFData SDM308-5 satellite modem. Firmware FW/0713-60E, version 6.05. 2.0 General Remote control and status information is transferred via a RS-485 (optional RS-232C) serial communications link.
  • Page 179 Remote Control SDM-309B Satellite Modem 3.1 Start Character A single character precedes all messages transmit on the remote link. This character flags the start of a messege. This character is: “<“ for commands and “>“ for responses. 3.2 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 180 SDM-309B Satellite Modem Remote Control Each message is ended with a single character which signals the end of message. This characters is: “cr” (carriage return character) for commands. “]” (end bracket) for responses. 4.0 Configuration Commands/Responses 4.1 Modulator Configuration Commands 4.1.1 Set Modulator Frequency (to nnn.nnnn MHZ, nnn.nnnn = 50.0000-...
  • Page 181 Remote Control SDM-309B Satellite Modem the standard ‘sMRx_" commands. Modems that have the variable rate option installed will also respond to the special ‘sMRV_" command. 4.1.3.1 Modulator Filter Rate Assignment Command: (x = A,B,C, or D Filter designator) <add/AMRx_nnn_mmmm.m”cr” (nnn = 1/2,3/4, or 7/8 Coder rate) (mmmm.m = 48.0 to 4080.0 (Data rate)
  • Page 182 SDM-309B Satellite Modem Remote Control 4.1.4 Set Modulator Power Offset Command: <add/MPO_snn.n”cr” Response: >add/MPO_snn.n”cr””lf”] snn.n = +20.0 to -20.0 in 0.5dB increments. Note: This will be the highet modulator power that will be displayed and programmed. Use the MOP_ command to actually change the modulator output power.
  • Page 183 Remote Control SDM-309B Satellite Modem Status Only: <add/DF_”cr” Response: >add/DF_nn.nnnn”cr””lf”] 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 184 SDM-309B Satellite Modem Remote Control 4.2.2.3 Select Demodulator Rate Variable *Variable Rate Option Only* Command: (nnn = 1/2,3/4, or 7/8 Coder rate) <add/SDRV_nnn_mmmm.m”cr” (mmmm.m = 48.0 to 4080.0 Data rate) Response: >add/SDRV_nnn_mmmm.m”cr””lf”] Status Only: see DR command. 4.2.3 Differential Decoder Enable...
  • Page 185 Remote Control SDM-309B Satellite Modem 4.2.7 Sweep Reacquisition This command is used to specify time duration of the reacquisition mode. The sweep is reduced to plus/minus 2500Hz of the last known lock point. Use of this function may reduce reacquisition times at low data rates. To inhibit the sweep reacquisition mode set ‘sR"...
  • Page 186 SDM-309B Satellite Modem Remote Control Status Only: <add/SCF_”cr””lf” Response: (x = + or - sweep offset direction). >add/SCF_xnnnnn”cr””lf”] (nnnnn = 0 to 25000. *Note: This command is only valid when fast acquisition is enabled. See the "FAM_" command definition. 4.2.10 Sweep Width Range This command sets the overall travel of the sweep during acquisition.
  • Page 187 Remote Control SDM-309B Satellite Modem 4.3.2 External Reference Frequency Command: <add/ERF_nnnnn”cr” Response: >add/ERF_nnnnn”cr””lf”] nnnnn = 8 to 99992 (external reference frequency in KHz, must be a a multiple of 8KHz). Status Only: <add/ERF_”cr” Response: >add/ERF_nnnnn”cr””lf”] 4.3.3 Interface Loop-back (ON/OFF) Command: (xxx = ON or OFF) <add/ILB_xxx”cr”...
  • Page 188 SDM-309B Satellite Modem Remote Control 4.3.8 Descramble Enable (ON/OFF) Command: (xxx = ON or OFF) <add/DE_xxx”cr” Response: >add/DE_xxx”cr””lf”] Status Only: <add/DE_”cr” Response: >add/DE_xxx”cr””lf”] 4.3.9 Interface Substitute Pattern (Transmit 2047 Pattern) Command: (xxx = ON or OFF) <add/ISP_xxx”cr” Response: >add/ISP_xxx”cr””lf”] Status Only: <add/ISP_”cr”...
  • Page 189 Remote Control SDM-309B Satellite Modem 4.3.13 Transmit Data Fault Command: <add/TDF_xxxx”cr” Response: >add/TDF_xxxx”cr””lf”] xxxx = NONE, DATA, or AIS (transmit data fault flagged on transmit data loss, AIS from terrestrial interface or none flagged). Status Only: <add/TDF_”cr” Response: >add/TDF_xxxx”cr””lf”] 4.3.14 Receive Data Fault Command: <add/RDF_xxxx”cr”...
  • Page 190 SDM-309B Satellite Modem Remote Control cc = 1 to 31 (terrestrial time slot number for E1 data formats). Status Only: <add/DCA_dd”cr” Response: >add/DCA_dd;cc”cr””lf”] Note: This command is not valid if the drop data format is specified to be T1IBS or E1IBS.

  • Page 191: System Configuration Commands

    Remote Control SDM-309B Satellite Modem 4.3.20 Bulk Insert Channels Assignment Command: <add/BICA_ii;cc_ii;cc_ii;cc_ii;cc..”cr” Response: >add/BICA_ii;cc_ii;cc_ii;cc_ii;cc..”cr””lf”] ii = 1 to N, (over the satellite insert channel) where N = (Modulator Data Rate) divided by (64Kbps). cc = 1 to 24 (terrestrial channel number for T1 data formats).
  • Page 192 SDM-309B Satellite Modem Remote Control 4.4.3 Remote Configures the MODEM for remote operation. The SDM308-5 will respond to any status request at any time. However, the SDM308-5 must be in “Remote Mode” to change configuration parameters. Command: <add/REM_”cr” Response: >add/REM_”cr””lf”] 4.4.4 Clear Stored Faults...
  • Page 193 Remote Control SDM-309B Satellite Modem filter “A” assignment AMRA_nnn_mmmm.m”cr” filter “B” assignment AMRB_nnn_mmmm.m”cr” filter “C” assignment AMRC_nnn_mmmm.m”cr” filter “D” assignment AMRD_nnn_mmmm.m”cr” Carrier Only Mode (ON/OFF) COM_xxx”cr” Differential Encoder (ON/OFF) DENC_xxx”cr” modulator variable rate assignment AMRV_nnn.mmmm.m”cr””lf”] *(variable rate option only)* 5.1.2 Modulator/Coder Configuration Program Status This command is used by the SMS658 M:N protection switch to collect information that is necessary to configure back-up modems.
  • Page 194 SDM-309B Satellite Modem Remote Control *Sweep Direction SD_s”cr” Fast Acquisition Mode FAM_xxx”cr” demodulator variable rate assignment ADRV_nnn.mmmm.m”cr””lf”] (variable rate option only)* *Note: ‘sCF_", ‘sWR_", and ‘sD_" responses are returned only when fast acquisition is enabled. See the "FAM_" command definition.
  • Page 195 Remote Control SDM-309B Satellite Modem Coding Format Receive (AMI/HDB3/B8ZS) ICFR_xxxx”cr” Substitution Pattern (ON/OFF) ISP_xxx”cr” Transmit Data Fault (NONE/DATA/AIS) TDF_xxxx”cr” Receive Data Fault (NONE/DATA/AIS) RDF_xxxx”cr” Interface Buffer Size IBS_nnnnnn”cr” Interface Read Error Select (FRM/2047) IRE_xxxx”cr” Descrambler Enable (ON/OFF) DE_xxx”cr” Scrambler Enable (ON/OFF) SE_xxx”cr”...
  • Page 196 SDM-309B Satellite Modem Remote Control Synthesizer lock (OK/FLT) SYN_xxx”cr” I-channel (OK/FLT) ICH_xxx”cr” Q-channel (OK/FLT) QCH_xxx”cr” bit clock (OK/FLT) BCLK_xxx”cr” BER threshold (OK/FLT) BERT_xxx”cr” Receive Signal Level (level or No Data) RSL_-nn.ndBm”cr” Current Sweep Value CSV_snnnnn”cr” Number of stored faults logged (0 to 10) SFLT_xx”cr””lf”]...
  • Page 197 Remote Control SDM-309B Satellite Modem 5.8 Bit Error Rate Status 5.8.1 Raw BER Command: <add/RBER_”cr” Response: nnnn = RBER or nnnn = <1.0 (lower limit) >add/RBER_nnnnE-4”cr””lf”] Example: Request Raw BER from modem 123. Command: <123/RBER_”cr” Response: RBER = .0152 errors/bit >123/RBER_152E-4”cr””lf”]...
  • Page 198 SDM-309B Satellite Modem Remote Control 2. Data delimited by a comma (“,”) will be returned for all time intervals logged. 3. The optional data modifiers “>“ and “<“ are only present if the error rate exceeds the computational resolution of the system.
  • Page 199 Remote Control SDM-309B Satellite Modem 5.12 Receive Signal Level Status Command: <add/RSL_”cr” Response: >add/RSL_-nn.ndBm”cr””lf”] 5.13 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”] s = + or - (sweep offset direction).
  • Page 200 SDM-309B Satellite Modem Remote Control “#” Fault number (0 - 9), “0” is the first fault stored. Hours in twenty four hour format. Minutes. Seconds. Month. Year. MN/U-SDM309B Rev. # B-B–23...
  • Page 201 Remote Control SDM-309B Satellite Modem 5.16.1 Modulator Stored Faults Command: <add/MSF_#”cr” Response: >add/MSF_# hh:mm:ss MM/DD/YY”cr” Module missing or won”t 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 202 SDM-309B Satellite Modem Remote Control Insert (OK/FLT) INS_xxx”cr” Receive Backward Alarm (OK/FLT) BWA_xxx”cr” Frame BER (OK/FLT) BER_xxx”cr” Receive Data Loss/AIS (OK/FLT) RXD_xxx”cr” Buffer Overflow (OK/FLT) OVFL_xxx”cr” Buffer Underflow (OK/FLT) UNFL_xxx”cr””lf”] 5.17 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.
  • Page 203 Remote Control SDM-309B Satellite Modem Parameter 17 (p17): RF loop-back ON/OFF. p17 = n, where “n” is “0” to indicate off or “1” to indicate on. Parameter 18 (p18): Differential decoder enable ON/OFF. p18 = n, where “n” is “0” to indicate off or “1” to indicate on.
  • Page 204 SDM-309B Satellite Modem Remote Control 5.18 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 205 Remote Control SDM-309B Satellite Modem Bit 3 through Bit 0 = Binary representation (0 - 10) of the number of common equipment stored faults. Character “f”: Common equipment fault status character 2. Bit 6 = 1 always. Bit 5 = Battery fault.
  • Page 206 SDM-309B Satellite Modem Remote Control 5.19 Bulk Consolidated Anolog Status This command is similar to the “BCS_” command but, returns MODEM anolog 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 Remote Control SDM-309B Satellite Modem Where x.xx is the software version number. B-B–30 MN/U-SDM309B Rev. #...

  • Page 208: Appendix C. External Channel Unit

    EXTERNAL CHANNEL UNIT 1.1 General The following Appendix is an aide in interconnecting the SDM-309B modem with the Multipoint M1200 channel unit for IBS service. The interface options are described in Section 2. Figure C-1 is a block diagram of a satellite communications system using an external channel unit with the SDM-309B modem.
  • Page 209 External Channel Unit SDM-309B Satellite Modem molex connector on the cable between the modem and the channel unit. The following drawings (Figure C-2 through C-8) are attached for reference. C-C–2 MN/U-SDM309B Rev. #...
  • Page 210 SDM-309B Satellite Modem External Channel Unit Figure C-1 Satellite Communications System With External Channel Unit MN/U-SDM309B Rev. # C-C–3...
  • Page 211 External Channel Unit SDM-309B Satellite Modem Figure C-2 System Interconnect Diagram C-C–4 MN/U-SDM309B Rev. #...
  • Page 212 SDM-309B Satellite Modem External Channel Unit Figure C-3 Adapter Cable AS/0749 (V.35) MN/U-SDM309B Rev. # C-C–5...
  • Page 213 External Channel Unit SDM-309B Satellite Modem Figure C-4 Adapter Cable AS/0750 (V.35) C-C–6 MN/U-SDM309B Rev. #...
  • Page 214 SDM-309B Satellite Modem External Channel Unit Figure C-5 Adapter Cable AS/0751 (RS449) MN/U-SDM309B Rev. # C-C–7...
  • Page 215 External Channel Unit SDM-309B Satellite Modem Figure C-6 Adapter Cable AS/0752 (15 Pin “D”) C-C–8 MN/U-SDM309B Rev. #...
  • Page 216 SDM-309B Satellite Modem External Channel Unit Figure C-7 Adapter Cable AS/0741 (RS449) MN/U-SDM309B Rev. # C-C–9...
  • Page 217 External Channel Unit SDM-309B Satellite Modem Figure C-8 Adapter Cable AS/0753 (15 Pin “D”) C-C–10 MN/U-SDM309B Rev. #...
  • Page 218 SDM-309B Satellite Modem External Channel Unit 2.0 Digital Interfaces 2.1 RS422 & MIL-STD-188-114 Interface 2.1.1 Functional Description The RS422 and MIL-STD-188-114 digital interface (Figure C-9) provides the level translation, buffering and termination between the internal modem signals and the RS422 or MIL-STD-188-114 interface on the rear panel.
  • Page 219 External Channel Unit SDM-309B Satellite Modem The RS422 and MIL-STD-188-114 interface also provides bi-directional relay loopback of both the clock and data at the DCE interface. In LOOPBACK, from the DTE side, SD is connected to RD, and either ST or TT (in INTERNAL or EXTERNAL mode) is looped back to RT.
  • Page 220 SDM-309B Satellite Modem External Channel Unit Figure C-9 RS422 & MIL-STD-188-114 Interface MN/U-SDM309B Rev. # C-C–13...
  • Page 221 External Channel Unit SDM-309B Satellite Modem Figure C-10 RS422 & MIL-STD-188-114 Block Diagram C-C–14 MN/U-SDM309B Rev. #...
  • Page 222 SDM-309B Satellite Modem External Channel Unit Table C-1 AS/0627-3 Rev E Board Jumper Selection TX Clock Select Normal Invert Auto* Interface Select V.35 (-2) Mil-188/RS232 (-3)* RX Data Normal* Buffer RX Clock Normal* Buffer Address Set Address Set Address Set...

  • Page 223: Connector Pinouts

    External Channel Unit SDM-309B Satellite Modem 2.1.2 Connector Pinouts The RS422 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 and latching blocks are provided for mechanical security of the mating connector.
  • Page 224 SDM-309B Satellite Modem External Channel Unit 2.2 V.35 Interface 2.2.1 Functional Description The V.35 digital interface (Figure C-11) provides level translation, buffering and termination between the internal modem signals and the V.35 DCE interface on the rear panel. Electrical characteristics of the interface signals are defined in CCITT Recommendation V.35.
  • Page 225 External Channel Unit SDM-309B Satellite Modem front edge of the card. The JP10 REM setting is used when loop timing is supported by software on the M&C and will be included in the front panel menu. Three fault outputs are provided on dry contact Form C relays. These are the COMMON EQUIPMENT, MODULATOR, and DEMODULATOR faults.
  • Page 226 SDM-309B Satellite Modem External Channel Unit Figure C-11 V.35 Interface Card MN/U-SDM309B Rev. # C-C–19...
  • Page 227 External Channel Unit SDM-309B Satellite Modem Figure C-12 V.35 Interface Block Diagram C-C–20 MN/U-SDM309B Rev. #...
  • Page 228 SDM-309B Satellite Modem External Channel Unit 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.

  • Page 229: Front Panel Operation

    External Channel Unit SDM-309B Satellite Modem 3.0 Front Panel Operation 3.1 Configuration Modem configuration may be viewed or changed by entering the “CONFIG” level from the ‘sELECT” menu on the front panel. Figures C-13 through C-15 show the structure of the front panel menu tree.
  • Page 230 SDM-309B Satellite Modem External Channel Unit TX_Power Programs the modulator output power level from -5 dBm to -15 dBm in 0.5 dB Steps. On entry the current transmitter power level is displayed with the flashing cursor on the first character. The up and down keys are used to increase or decrease the output power level in 0.5 dBm Steps.
  • Page 231 External Channel Unit SDM-309B Satellite Modem TX_Clock Programs the modem for internal or external transmitter clock. On entry, the current status of the Transmit Clock is displayed with the flashing cursor on the first character. Use the arrow keys to select “Internal”...
  • Page 232 SDM-309B Satellite Modem External Channel Unit 3.2 Monitor The “MONITOR” level is accessible from the ‘sELECT” menu. The following modem parameters are displayed in real time when selected. Raw_BER Raw bit error rate. * Range: <1.0E-4 to 2550E-4 Corr_BER Corrected bit error rate.
  • Page 233 External Channel Unit SDM-309B Satellite Modem 3.4 Stored Faults The Modem stores the first ten (Flt0 - 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 234 SDM-309B Satellite Modem External Channel Unit Assign TX_Fltrs: Modulator Symbol Rate The modulator has four symbol rate filters. Each Assignment 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 235 External Channel Unit SDM-309B Satellite Modem Figure C-13 Menu Tree C-C–28 MN/U-SDM309B Rev. #...
  • Page 236 SDM-309B Satellite Modem External Channel Unit Figure C-14 Menu Tree MN/U-SDM309B Rev. # C-C–29...
  • Page 237 External Channel Unit SDM-309B Satellite Modem Figure C-15 Menu Tree C-C–30 MN/U-SDM309B Rev. #...
  • Page 238 SDM-309B Satellite Modem External Channel Unit MN/U-SDM309B Rev. # C-C–31...

  • Page 239: Appendix D. Software Change Specifications

    Appendix D. SOFTWARE CHANGE SPECIFICATIONS Steps 1 through 5 are instructions for changing software on the Monitor and Control card. Steps 6 through 9 are instructions for changing software on the Viterbi Decoder card. If you do not need to change Viterbi Decoder software, skip to Step 10 and continue.
  • Page 240 Software Change Instructions SDM-309B Satellite Modem 11. Go to the “Utility” menu on the front panel and program the time, day, TXA, TXB, TXC, TXD, RXA, RXB, RXC, and RXD to the new data/code rates. Note: The data/code rate assignment in the “Utility” menu MUST match the filter assignment on the daughter card.

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