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Comtech EF Data SMS-758 Installation And Operation Manual

Modem protection switch
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SMS-758
SMS-758
SMS-758
SMS-758
Modem Protection Switch
Modem Protection Switch
Modem Protection Switch
Modem Protection Switch
Installation and Operation Manual
Installation and Operation Manual
Installation and Operation Manual
Installation and Operation Manual
Part Number MN/SMS758.IOM
Revision 3

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Summary of Contents for Comtech EF Data SMS-758

  • Page 1 SMS-758 SMS-758 SMS-758 SMS-758 Modem Protection Switch Modem Protection Switch Modem Protection Switch Modem Protection Switch Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Part Number MN/SMS758.IOM Revision 3...
  • Page 3 EFData Corporation is an ISO 9001 Registered Company SMS-758 SMS-758 SMS-758 SMS-758 Modem Protection Switch Modem Protection Switch Modem Protection Switch Modem Protection Switch Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual Installation and Operation Manual...

  • Page 4: Warranty Policy

    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 describes the installation and operation for the EFData SMS-758 modem protection switch. Audience This is a technical document intended for earth station engineers, technicians, and operators responsible for the operation and maintenance of the SMS-758 modem protection switch.
  • Page 6 Preface SMS-758 Modem Protection Switch Revision Numbering Scheme The following table identifies the revision numbering scheme utilized for EFData installation and operation manuals, addenda, and supplements: Part Number Description MN/SMS758 Rev. 0 1st edition of the manual. MN/SMS758 Rev. 1 1st revision of the manual.

  • Page 7: Case Sensitivity

    SMS-758 Modem Protection Switch Preface Heading Hierarchy Each section of this manual is structured according to the following heading hierarchy: Level Heading Format 1 (Highest) Level Heading 1 Level Heading 2 Level Heading 3 4 (Lowest) Level Heading 4 Case Sensitivity Unless stated otherwise, commands and arguments listed in this manual are not case sensitive.

  • Page 8: Related Documents

    Preface SMS-758 Modem Protection Switch Related Documents The following documents are referenced in this manual: • Department of Defense (DOD) MIL-STD-188-114A, “Electrical Characteristics of Digital Interface Circuits.” • EFData Specification SP/1891. Reporting Comments or Suggestions Concerning this Manual Comments and suggestions regarding the content and design of this manual will be appreciated.

  • Page 9: 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 ..............................1–2 1.4 Performance Specification ........................1–10 CHAPTER 2. INSTALLATION ................... 2–1 2.1 Unpacking..............................2–1 2.2 System Installation............................2–2 2.2.1 Switch Setup............................2–2 2.2.2 Modem Setup ............................
  • Page 10 Table of Contents SMS-758 Modem Protection Switch CHAPTER 3. OPERATION ..................3–1 3.1 Front Panel Description ..........................3–1 3.1.1 LED Indicators ............................3–2 3.1.2 Keypad and LCD Display........................3–2 3.2 Switch Setup..............................3–6 3.2.1 System Setup ............................3–6 3.2.1.1 Time and Date Menu........................3–6 3.2.1.2 Downlink Option..........................
  • Page 11 SMS-758 Modem Protection Switch Table of Contents 4.2 Modem Control Interface Specification..................... 4–5 4.3 Relay-Remote Interface Specification......................4–6 4.3.1 Command Structure..........................4–6 4.4 Fault Interface Specification........................4–9 4.4.1 Controller fault ............................4–9 4.4.2 M:N Fault ............................... 4–9 4.4.3 Demodulator Signal Fault........................4–10 4.5 Online Status Specification ........................
  • Page 12 Table of Contents SMS-758 Modem Protection Switch 4.9 IF Switch..............................4–47 4.9.1 Specifications ............................4–47 4.9.2 Theory of Operation ..........................4–47 4.10 Online Telemetry ............................. 4–49 4.10.1 Specifications ............................. 4–49 4.10.2 Theory of Operation ........................... 4–49 4.11 Power Supply ............................4–51 4.11.1 Specifications .............................
  • Page 13 SMS-758 Modem Protection Switch Table of Contents A.3 Configuration Commands/Responses .......................A–4 A.3.1 Modulator Configuration Commands/Responses ..................A–4 A.3.1.1 Prime Modulator Active.........................A–4 A.3.1.2 BackupModulator Active .......................A–4 A.3.2 Demodulator Configuration Commands/Responses ................A–4 A.3.2.1 Prime Demodulator Active......................A–4 A.3.2.2 Prime Demodulator Transponder ....................A–5 A.3.2.3 Backup Demodulator Active ......................A–5 A.3.3 Modem Configuration Commands/Responses..................A–5...
  • Page 14 Table of Contents SMS-758 Modem Protection Switch APPENDIX B. REMOTE CONTROL OPERATION: INDEPENDENT MOD/DEMOD B–1 B.1 General.................................B–1 B.2 Message Structure............................B–1 B.2.1 Start Character ............................B–2 B.2.2 Device Address............................B–2 B.2.3 Command/Responses..........................B–3 B.2.4 End Character ............................B–3 B.3 Configuration Commands/Responses......................B–4 B.3.1 Modulator Configuration Commands/Responses ..................B–4 B.3.1.1 Prime Modulator Active.........................B–4...
  • Page 15 SMS-758 Modem Protection Switch Table of Contents B.3.5.7 Verify Modem Configuration(s)....................B–14 B.3.5.7.1 Verify All Active Modems Configurations ................B–14 B.3.5.7.2 Verify Prime Modem Configuration ..................B–15 B.3.5.7.3 Verify Backup Modem Configuration ..................B–15 B.3.5.8 Operational Status Commands (Faults) ..................B–15 B.3.5.8.1 Modulator Operational Faults Status ..................B–15 B.3.5.8.2 Demodulator Operational Faults Status ................B–15...
  • Page 16 Table of Contents SMS-758 Modem Protection Switch This page is intentionally left blank. MN/SMS758 Rev. 3...

  • Page 17: Chapter 1. Introduction

    Chapter 1. INTRODUCTION 1.1 Scope This manual describes the SMS-758 modem protection switch (Figure 1-1), hereafter called “the switch.” The switch is a rack-mounted unit that provides independent backup control for modulators and demodulators, or simultaneous modulator and demodulator (modem) switching.

  • Page 18: Description

    Introduction SMS-758 Modem Protection Switch The switch does not contain an IF signal combining/dividing section, so that the user may externally tailor each application for minimum loss. An example system configuration using four prime modems is shown in Figure 1-6.
  • Page 19 PR V BATTERY A UTO LOCAL S M S -758 DEMOD REMOTE M :N S W I T C H B YPASS S TAT U S FA U LT S Figure 1-1. SMS-758 Modem Protection Switch MN/SMS758 Rev. 3 1–3...
  • Page 20 Introduction SMS-758 Modem Protection Switch Figure 1-2. System Block Diagram 1–4 MN/SMS758 Rev. 3...
  • Page 21 SLOT 1 SLOT 3 POWER SUPPLY SWITCH DRIVER SLOT 2 SLOT 4 NOT USED ADDRESS DEC/DRV SLOT 5 MONITOR AND CONTROL SLOT 6 ONLINE TELEMETRY SLOT 7 POWER SUPPLY 2 Figure 1-3. SMS-758 Upper Front Section Interior MN/SMS758 Rev. 3 1–5...
  • Page 22 DOWNLINK 4 MOD 6 IF 6 DOWNLINK 3 IF 7 MOD 7 DOWNLINK 2 DOWNLINK 1 MOD 8 IF 8 BACKUP DEMOD 2 BACKUP 2 IF OUTPUT BACKUP 1 IF OUTPUT Figure 1-4. SMS-758 IF Switching Matrix 1–6 MN/SMS758 Rev. 3...
  • Page 23 SMS-758 Modem Protection Switch Introduction Figure 1-5. SMS-758 Block Diagram MN/SMS758 Rev. 3 1–7...
  • Page 24 Introduction SMS-758 Modem Protection Switch Figure 1-6. Example System Configuration 1–8 MN/SMS758 Rev. 3...
  • Page 25 SMS-758 Modem Protection Switch Introduction The switch consists of the following assemblies: Assembly Description Drawing No. Chassis AS/1890 Controller Motherboard AS/1317 Data Switch Motherboard AS/1349 Monitor and Control AS/0356 Address Decoder/Driver AS/1048 Switch Driver AS/1316 IF Switch AS/1314 O/L Telemetry...

  • Page 26: Performance Specification

    Introduction SMS-758 Modem Protection Switch 1.4 Performance Specification The operating specifications of the switch are described in Table 1-1. Table 1-1. SMS-758 Performance Specification Operation Number of Online Modems Expandable from 1 to 8 with plug-in prime interface switch modules (the modems can be of different data rates and interfaces, as long as the backup modems are compatible).
  • Page 27 SMS-758 Modem Protection Switch Introduction Indicators: Front Panel LEDs Power supply on, controller and power supply alarm, demodulator system failure, modulator system failure, low battery alarm, auto mode, local mode, remote mode, and bypass mode. Prime and backup modulator and...
  • Page 28 Introduction SMS-758 Modem Protection Switch This page is intentionally left blank. 1–12 MN/SMS758 Rev. 3...

  • Page 29: Chapter 2. Installation

    Chapter 2. INSTALLATION This chapter consists of: • Unpacking instructions • System installation • System requirements • Description of the external connections The equipment contains parts and assemblies sensitive to damage by Electrostatic Discharge (ESD). Use ESD precautionary procedures when CAUTION touching, removing, or inserting printed circuit boards.

  • Page 30: System Installation

    Installation SMS-758 Modem Protection Switch 2.2 System Installation 2.2.1 Switch Setup After unpacking, refer to the following steps to install the switch: 1. Mount the switch chassis in the assigned position of the equipment rack. It is recommended that the switch be supported by a rack-mounted shelf.

  • Page 31: Modem Setup

    SMS-758 Modem Protection Switch Installation 2.2.2 Modem Setup J28 through J35 are the eight IF outputs available to connect to the customer-supplied uplink power combiners. J7 through J10, and J12 through J15, are the downlink inputs available for use with up to eight customer-supplied downlink splitters.

  • Page 32: External Connections

    RS232 INPUTS OFF-LINE BACKUP IF OUTPUTS MOD INPUTS IF OUTPUTS MODEM CONTROL RS485 DEMOD 90-264 VAC BACK-UP ON-LINE STATUS ON-LINE STATUS REMOTE/FAULT DEMODS PRIME INTERFACE BACKUP INTERFACE SWITCH MODULES SWITCH MODULES Figure 2-1. SMS-758 Rear Panel 2–4 MN/SMS758 Rev. 3...

  • Page 33: Data I/O

    SMS-758 Modem Protection Switch Installation Table 2-1. Rear Panel Connections Name Ref. Desig. Connector Function DATA I/O A1 - A10 37-Pin D RS-422/449 and J1, J2 MIL-STD-188-114 I/O 34-Pin Block V.35 I/O 15-Pin D DS-1 and G.703 I/O 37-Pin D...

  • Page 34: External Rs485 And Rs232 Interface (J1 And J2)

    Installation SMS-758 Modem Protection Switch 2.4.2 External RS485 and RS232 Interface (J1 and J2) The external interface connectors provide serial remote interface to the switch. An external controller can connect through J1 (RS-485) or J2 (RS-232C). Use M&C module switch pack SP1 switch 5 (SP1-5) to configure each switch for external remote interface type, either RS-485 or RS-232C.

  • Page 35: On-Line Status (J4, J5)

    SMS-758 Modem Protection Switch Installation 2.4.4 On-Line Status (J4, J5) Connectors J4 and J5 provide the output for the modulator and demodulator backup online status in form C format: • J4 is for the modulator online status. • J5 is for the demodulator online status.

  • Page 36: Relay-Remote/Fault (J6)

    Installation SMS-758 Modem Protection Switch 2.4.5 Relay-Remote/Fault (J6) This 25 pin connector provides both input and output signals. The inputs are contact closures or logic-level remote control inputs. The outputs are form C relay contact closures for controller fault, M:N fault, and demodulator system fault.

  • Page 37: Back-Up Demods (J11, J16)

    SMS-758 Modem Protection Switch Installation 2.4.7 Back-up Demods (J11, J16) J11 and J16 provide the outputs from the downlink switching matrix. J11 is the backup demod 1 output, and J16 is the backup demod 2 output. They connect to the backup modem’s RX IF inputs.

  • Page 38: If Outputs (J28 Through J35)

    Installation SMS-758 Modem Protection Switch 2.4.11 IF Outputs (J28 through J35) J28 through J35 are the modulator IF switching matrix output connections. They connect to the external uplink power combiners. Up to 8 uplinks can be connected to the switch, or as few as 1.

  • Page 39: Chapter 3. Operation

    The display updates every second, and the LEDs and beeper update as needed. SMS-758 MODEM PROTECTION SWITCH SWX.XX PRESS NEXT NEXT POWER PREV BATTERY AUTO SMS-758 LOCAL DEMOD REMOTE BYPASS M:N SWITCH STATUS FAULTS Figure 3-1. SMS-758 Front Panel MN/SMS758 Rev. 3 3–1...

  • Page 40: Led Indicators

    Operation SMS-758 Modem Protection Switch Any keypad activity provides an interrupt to the processor, which then scans the keypad. After the input has been recognized, the processor takes the appropriate action. All switch functions are accessible to the operator from the front panel through the [F1] and [F2] keys, the [PREV] key, and the [NEXT] key.
  • Page 41 SMS-758 Modem Protection Switch Operation The base levels of this tree-structured front panel menu are as follows: • ID menu displayed at power-on • SYSTEM and MODEM SETUP menu • CONFIGURATION and VERIFICATION menu • FAULT menu • MODE menu •...
  • Page 42 Operation SMS-758 Modem Protection Switch Figure 3-2. SMS-758 Display Map (Sheet 1 of 2) 3–4 MN/SMS758 Rev. 3...
  • Page 43 SMS-758 Modem Protection Switch Operation Figure 3-2. SMS-758 Display Map (Sheet 2 of 2) MN/SMS758 Rev. 3 3–5...

  • Page 44: Switch Setup

    Operation SMS-758 Modem Protection Switch 3.2 Switch Setup 3.2.1 System Setup Enter the SYSTEM SETUP menu to enter, change, or view the system setup configuration. The definitions of the system setup functions are as follows: TIME AND DATE Time and date are entered and displayed.

  • Page 45: Downlink Option

    SMS-758 Modem Protection Switch Operation 3.2.1.2 Downlink Option This menu displays the current downlink option, showing how many downlinks and backups are selected. The operator may choose from four downlinks with two backups possible, or seven downlinks and only one backup. Pressing any number key will toggle the two options, and pressing [ENT] will load the displayed choice into memory.

  • Page 46: Modem Addresses Menu

    Operation SMS-758 Modem Protection Switch 3.2.1.7 Modem Addresses Menu This menu displays the current addresses of the prime and backup modems, and channel units, if applicable. Addresses of 1 through 255 are valid. Entering a new address and pressing [ENT] loads the address into memory. If no address is entered for an active modem, an M:N fault results.

  • Page 47: Interface Type Menu

    SMS-758 Modem Protection Switch Operation The operator can view the modem configuration parameters by using the [NEXT] and [PREV] keys. A flashing cursor will be displayed over the selected parameter. To enter data or change a parameter, the operator uses the keypad to enter the data. When all data or changes for that parameter are correct, press [ENT] to load the information into memory.

  • Page 48: Downlink Selection Menu

    Operation SMS-758 Modem Protection Switch 3.2.2.2 Downlink Selection Menu This menu displays the current downlink number (1 through 4, or 1 through 7) for each demodulator. When the operator enters the number of the downlink selected and presses [ENT], that information is loaded into memory. If no downlink is selected for an active demodulator, an M:N fault results.

  • Page 49: Demodulator Delay

    SMS-758 Modem Protection Switch Operation 3.2.2.5 Demodulator Delay This menu displays the current online delay for this prime demodulator, and allows the operator to enter a new parameter. The DEMOD DELAY is the time allowed for the prime demodulator to clear its faulted state. At the end of this delay, if the prime is no longer faulted, it will be restored to online status.

  • Page 50: Modem Configuration

    Operation SMS-758 Modem Protection Switch 3.2.3 Modem Configuration 3.2.3.1 Prime and Backup Modem Configuration The operator must be sure that the prime modems have all parameters properly configured for operation prior to configuration loading or verifying. The only required parameters for a backup modem are the data rate and code rate assignments in the modem’s utility menu.

  • Page 51: Modem Verification

    SMS-758 Modem Protection Switch Operation 3.2.3.3 Modem Verification To verify the modem configurations, press [F2] (VERIFY) in the MODEM CONFIGURATION menu, and proceed as follows: 1. To verify the configuration of an individual prime or backup modem, use the [F1] (SELECT) menu. If F1 (SELECT) is pressed, the menu presents options of PRIME (F1) and BACKUP (F2).

  • Page 52: Demodulator Operation Fault

    Operation SMS-758 Modem Protection Switch 3.2.4.2 Demodulator Operation Fault The fault menu displays DEMOD fault(s) when a demodulator backup switching operation failure occurs. The messages will be either of the following: BK-UP FAULT DMD X (Where: X = 1 to 8.) ALL DMDS D/L X FAULTED (Where: X = 1 to 7.)

  • Page 53: Operational Modes

    SMS-758 Modem Protection Switch Operation 3.2.5 Operational Modes The MODE menu selects the mode of operation. At power-up, the switch defaults to the BYPASS mode unless: • It was in a different mode prior to loss of power. • The battery-backed memory was maintained.
  • Page 54 Operation SMS-758 Modem Protection Switch In the AUTO mode, the switch monitors the prime and backup modulator and demodulator fault inputs, awaiting a failure. When no faults are present, the switch will place the backup modulator(s) and demodulator(s) in the “Hot Standby” mode for the highest priority prime(s), and a dash (-) will be displayed in the status display.
  • Page 55 SMS-758 Modem Protection Switch Operation When a modulator backup is required, the switch performs the following steps: 1. It verifies the configuration of the backup modulator and re-programs it, if necessary. 2. If more than one modulator is faulted, the switch selects the modulator with the highest priority.
  • Page 56 FLT’D? SET ALL DMDS ARE ALL FLT’D FLT. (BACK FLT’D PRIMES PRIME DMDS PANEL RELAY) NOT B/U’D? FLT’D? SET THE DMD OPERATION FLT. (FRONT PANEL LEDS.) Figure 3-3. SMS-758 Switching Algorithm Flow Chart (Demodulator and Modem) 3–18 MN/SMS758 Rev. 3...
  • Page 57 PLACE B/U ON-LINE DELAY TIMER TIMER TIMED FOR FLT’D PRIME TIMED OUT WITH “->“ ON OUT? FRONT PANEL. GO TO NEXT OTHER FLT’D PRIME IN THE PRIMES PRIORITY ORDER. FLT’D? Figure 3-4. SMS-758 Switching Algorithm Flow Chart (Modulator) MN/SMS758 Rev. 3 3–19...

  • Page 58: Local Mode

    Operation SMS-758 Modem Protection Switch 3.2.5.3 Local Mode In this operating mode, the switch responds to keypad input affecting setup, configuration, fault inquiries, and backup online status. If the switch is in this mode when power loss occurs, it will return to this mode when power is restored. However, the current backup status will be lost.

  • Page 59: Status Menu

    SMS-758 Modem Protection Switch Operation 3.2.6 Status Menu The STATUS display follows the MODE menu. It provides the following information: • Identifies the active modulators and demodulators, both prime and backup. • Shows backup online status. • Shows the fault status of all active prime and backup modulators and demodulators.
  • Page 60 Operation SMS-758 Modem Protection Switch This page is intentionally left blank. 3–22 MN/SMS758 Rev. 3...

  • Page 61: Chapter 4. Theory Of Operation

    Chapter 4. THEORY OF OPERATION 4.1 Monitor and Control A sophisticated microcontroller performs the monitor and control functions of the switch. The module, called the “Monitor and Control” (M&C), plugs into slot 5 of the switch chassis (refer to Figure 4-1 for a drawing of the M&C, and Figure 1-3 for the location in the chassis).

  • Page 62: Theory Of Operation

    Theory of Operation SMS-758 Modem Protection Switch 4.1.1 Theory of Operation The M&C module uses an Intel 80C31 microcontroller operating at 5.5295 MHz. The microsystem supports: • 128K bytes of Read-Only Memory (ROM) for code. • 64K bytes of Random-Access Memory (RAM) for data.

  • Page 63: Remote Baud Rate

    SMS-758 Modem Protection Switch Theory of Operation 4.1.3 Remote Baud Rate The eight position switch pack, SP1, on the M&C module programs the external remote serial communications baud rate and parity. Set the switches to ON (nearer the PCB) or OFF (away from the PCB) to select parity and baud rate.

  • Page 64: External Remote Serial Interface Selection

    To clear the memory, JP6 must be set OFF, and the leads of capacitor C12 must be shorted. JP6 must then be set ON again, so the memory can retain a new configuration. Note: The external battery option (JP8) is not supported in the SMS-758 chassis, and must be OFF.
  • Page 65 SMS-758 Modem Protection Switch Theory of Operation The functions for the error response switches, SW1-6, -7, and -8 are described in Table 4-1. Table 4-2 lists the different software versions required for each switch function. MN/SMS758 Rev. 3 4–5...

  • Page 66: External I/O Interrupt Arbitration

    WAIT for modem response 4.1.8 External I/O Interrupt Arbitration The SMS-758 switch does not use the external I/O interrupt arbitration function. JP12, JP13, and JP14 must be in the “LEFT” position to disable this function. 4.2 Modem Control Interface Specification...

  • Page 67: Relay-Remote Interface Specification

    SMS-758 Modem Protection Switch Theory of Operation 4.3 Relay-Remote Interface Specification This section defines the protocol and word/command structure of the relay-remote interface. The relay-remote input (J6) allows the user to execute a limited number of mode and online commands (refer to Section 2.4.5 for connector location and pinout). These commands are a series of 4-bit words.
  • Page 68 Theory of Operation SMS-758 Modem Protection Switch The command words must be sent to the switch with no more than 10 seconds between words for the switch to recognize a command. If the interval exceeds 10 seconds, the M&C resets the word buffer, and waits for the next START word.
  • Page 69 SMS-758 Modem Protection Switch Theory of Operation Table 4-5. Relay-Remote Command Functions Function Description AUTO Executed only from REMOTE mode. This function places the switch in the automatic mode of operation. REMOTE Executed from any operating mode other than REMOTE; must be executed before any other relay-remote function.

  • Page 70: Fault Interface Specification

    Theory of Operation SMS-758 Modem Protection Switch 4.4 Fault Interface Specification This section defines the protocol and format structure for monitoring the fault status interface of the switch. The relay-remote/fault rear panel connector (J6) provides interface for fault status information. (See Section 2.4.5 for connector location and pin-out information.) Three non-latching relays with form C contacts show: •...

  • Page 71: Demodulator Signal Fault

    SMS-758 Modem Protection Switch Theory of Operation 4.4.3 Demodulator Signal Fault A demodulator signal fault is the failure of all active demodulators on the indicated downlink to acquire and lock to their signals. The fault alarm indicates a possible down converter system failure, causing loss of IF to the demodulators.

  • Page 72: Interface Switches

    Theory of Operation SMS-758 Modem Protection Switch 4.6 Interface Switches The prime interface switch module can plug into any prime interface switch module slot (A1 through A8) on the left side of the lower rear panel. The backup interface switch module can plug into A9 or A10 (on the right side).

  • Page 73: Connector Pinouts

    SMS-758 Modem Protection Switch Theory of Operation 4.6.1.2 Connector Pinouts A 37-pin female D connector provides interface for the RS-422/449 and MIL-STD-188-114/RS-449 interface. Screw locks provide mechanical security for the mating connector. Signal Function Name Pin # Signal Ground 1,19,20,37...
  • Page 74 Theory of Operation SMS-758 Modem Protection Switch TRANSMIT CLOCK TRANSMIT CLOCK TRANSMIT DATA TRANSMIT DATA RECEIVE DATA TX S/B RECEIVE DATA RECEIVE CLOCK RECEIVE CLOCK RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK REFERENCE CLOCK TERRESTRIAL DATA I/O FAULTS PRIME C/U DATA I/O...
  • Page 75 SMS-758 Modem Protection Switch Theory of Operation DATA PATH SELECTION TRANSMIT CLOCK TRANSMIT DATA RECEIVE DATA RECEIVE CLOCK RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SWITCH MOTHERBOARD Figure 4-3. Backup RS-422/449 and MIL-STD-188-114/RS-449 Interface Switch MN/SMS758 Rev.

  • Page 76: Interface Switch

    Theory of Operation SMS-758 Modem Protection Switch 4.6.2 V.35 Interface Switch The V.35 interface switch module switches all interface signals by relay. The prime interface switch module (Figure 4-4) has two 34-pin female block connectors. • J1 (top) for terminal equipment is a DCE interface.

  • Page 77: Connector Pinouts

    SMS-758 Modem Protection Switch Theory of Operation 4.6.2.2 Connector Pinouts The V.35 interface is an industry standard 34-pin block connector. Screw locks provide mechanical security for the mating connector. Signal Function Name Pin # Signal Ground Transmit Data SD-A SD-B...
  • Page 78 Theory of Operation SMS-758 Modem Protection Switch TRANSMIT CLOCK TRANSMIT CLOCK TRANSMIT DATA TRANSMIT DATA RECEIVE DATA TX S/B RECEIVE DATA RECEIVE CLOCK RECEIVE CLOCK RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK REFERENCE CLOCK TERRESTRIAL DATA I/O FAULTS PRIME C/U DATA I/O...
  • Page 79 SMS-758 Modem Protection Switch Theory of Operation DATA PATH SELECTION TRANSMIT CLOCK TRANSMIT DATA RECEIVE DATA RECEIVE CLOCK RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SWITCH MOTHERBOARD Figure 4-5. Backup V.35 Interface Switch MN/SMS758 Rev.

  • Page 80: V.35/Rs-232 Interface Switch

    Theory of Operation SMS-758 Modem Protection Switch 4.6.3 V.35/RS-232 Interface Switch The V.35/RS-232 interface switch module switches all interface signals by relay. Interface types can be changed between V.35 and RS-232 by the SPDT toggle switch located on the back of the daughter card. Both the prime and backup interfaces must be in V.35 mode or RS-232 mode in order to operate correctly.

  • Page 81: Electrical Specifications

    SMS-758 Modem Protection Switch Theory of Operation 4.6.3.1 Electrical Specifications V.35 Circuit Supported SD, SCT, SCTE, RD, SCR, DSR, DSR, RLSD Switching Format Modulator and demodulator signals individually with dry contacts Contact Arrangement Mod Signals: 8 poles Demod Signals: 8 poles ±...

  • Page 82: Connector Pinouts

    Theory of Operation SMS-758 Modem Protection Switch 4.6.3.2 Connector Pinouts 4.6.3.2.1 V.35 Option The V.35 interface has been converted from the 34-pin block connector (refer to Figure 4-4) to a 25-pin D connector (refer to Figure 4-6) that is accessible from the back panel.

  • Page 83: Rs-232 Option

    SMS-758 Modem Protection Switch Theory of Operation 4.6.3.2.2 RS-232 Option When the switch is in the RS-232 position, the 25-pin D connector now provides the interface for RS-232 mode of operation. Screw locks are provided for mechanical security of the mating connector.
  • Page 84 Theory of Operation SMS-758 Modem Protection Switch TRANSMIT CLOCK TRANSMIT CLOCK TRANSMIT DATA TRANSMIT DATA RECEIVE DATA TX S/B RECEIVE DATA RECEIVE CLOCK RECEIVE CLOCK RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK REFERENCE CLOCK TERRESTRIAL DATA I/O FAULTS PRIME C/U DATA I/O...
  • Page 85 SMS-758 Modem Protection Switch Theory of Operation DATA PATH SELECTION TRANSMIT CLOCK TRANSMIT DATA RECEIVE DATA RECEIVE CLOCK RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SWITCH MOTHERBOARD Figure 4-7. Backup V.35/RS-232 Interface Switch MN/SMS758 Rev.

  • Page 86: And G.703 Interface Switch

    Theory of Operation SMS-758 Modem Protection Switch 4.6.4 DS-1 and G.703 Interface Switch The DS-1 and G.703 interface switch module switches all interface signals by relay. The prime interface switch module (Figure 4-8) that is most commonly used for DS-1 has two 15-pin female D connectors.

  • Page 87: Specification

    SMS-758 Modem Protection Switch Theory of Operation 4.6.4.1 Specification Circuits Supported SD, RD, MC. Switching Format Modulator and demodulator signals switched individually with dry contacts. Contact Arrangement Modulator signals: 2 poles. Demodulator signals: 4 poles. 4.6.4.2 Connector Pinouts The DS-1 and G.703 interface uses a 15-pin female D connector accessible from the switch rear panel.
  • Page 88 Theory of Operation SMS-758 Modem Protection Switch TRANSMIT DATA TRANSMIT DATA RECEIVE DATA RECEIVE DATA RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK TX S/B REFERENCE CLOCK FAULTS PRIME C/U TERRESTRIAL DATA I/O DATA I/O DATA PATH SELECTION TRANSMIT DATA RX S/B...
  • Page 89 SMS-758 Modem Protection Switch Theory of Operation DATA PATH SELECTION TRANSMIT DATA RECEIVE DATA RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SW ITCH MOTHERBOARD Figure 4-9. Backup DS-1 and G.703 Interface Switch MN/SMS758 Rev.

  • Page 90: Idr Interface Switch

    Theory of Operation SMS-758 Modem Protection Switch 4.6.5 IDR Interface Switch This section covers the 1:N AS/0895 prime and AS/0896 backup interfaces. Refer to Section 4.6.5 for information on the 2:N AS/1877 prime and AS/1879 backup interfaces. The IDR interface switch module switches all interface signals by relay. The prime interface switch module (Figure 4-10) has two 50-pin female D connectors.

  • Page 91: Specification

    SMS-758 Modem Protection Switch Theory of Operation 4.6.5.1 Specification Circuits Supported SD, RD, EXC, TXD, TXC, TXO, RXD, RXC, RXO, BWO 1-4, BWI 1-4, A1I, A1O, A2I, A2O, AND DEMOD FAULT. Switching Format All signals switched with dry contacts. Contact Arrangement Modulator signals: 16 poles.
  • Page 92 Theory of Operation SMS-758 Modem Protection Switch Backward Alarm 1 In BWI1 Backward Alarm 2 In BWI2 Backward Alarm 3 In BWI3 Backward Alarm 4 In BWI4 ADPCM 1 Audio In A1I-A A1I-B ADPCM 1 Audio Out A1O-A A1O-B ADPCM 2 Audio In...
  • Page 93 SMS-758 Modem Protection Switch Theory of Operation TRANSMIT DATA TRANSMIT DATA TRANSMIT ESC TRANSMIT ESC RECEIVE DATA TX S/B RECEIVE DATA RECEIVE ESC RECEIVE ESC RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK REFERENCE CLOCK TERRESTRIAL DATA I/O FAULTS PRIME C/U DATA I/O...

  • Page 94: 2:N Idr Interface Switch (1877 And 1879)

    The backup interface switch module (Figure 4-13) has one 50-pin female D connector. The backup modem interface J1 is a DTE interface. Note: This interface module can only be used in the SMS-758 or SMS-658A. Also, this interface can not be used in conjunction with the AS/895 or AS/896 IDR Interface Switch modules.

  • Page 95: Operation

    SMS-758 Modem Protection Switch Theory of Operation 4.6.6.2 Operation When configuring modem setup on the front panel, it is recommended to select #9 - IDR 2:N for the interface selection. Note: The 1877 and 1879 interface will not work when #5 - IDR is selected in the modem setup configuration.
  • Page 96 Theory of Operation SMS-758 Modem Protection Switch Backward Alarm 3 In BWI3 Backward Alarm 4 In BWI4 ADPCM 1 Audio In A1I-A A1I-B ADPCM 1 Audio Out A1O-A A1O-B ADPCM 2 Audio In A2I-A A2I-B ADPCM 2 Audio Out A2O-A...
  • Page 97 SMS-758 Modem Protection Switch Theory of Operation TRANSMIT DATA TRANSMIT DATA TRANSMIT ESC TRANSMIT ESC RECEIVE DATA RECEIVE DATA TX S/B RECEIVE ESC RECEIVE ESC RECEIVE EXTERNAL RECEIVE EXTERNAL REFERENCE CLOCK REFERENCE CLOCK TERRESTRIAL DATA I/O FAULTS PRIME C/U DATA I/O...
  • Page 98 Theory of Operation SMS-758 Modem Protection Switch DATA PATH SELECTION TRANSMIT ESC TRANSMIT DATA RECEIVE DATA RECEIVE ESC RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SWITCH MOTHERBOARD Figure 4-13. Backup 2:N IDR Interface Switch (1879) 4–38...

  • Page 99: 2:N Ibs/Async Interface Switch (1694 And 1695)

    (A1 through A8) on the left side of the lower rear panel. The backup interface can plug into either A9 or A10. Note: This interface module can only be used in the SMS-758 or SMS-658A. Also, this interface cannot be used in conjunction with the AS/0895 or AS/0896 1:N IDR Interface Switch modules.

  • Page 100: Operation

    Theory of Operation SMS-758 Modem Protection Switch 4.6.7.2 Operation When configuring the modem setup on the front panel, use the terrestrial type (G.703 15-pin D, V.35 34-pin, RS-422 37-pin D) for the interface selection. Refer to Figures 4- 16 and 4-17 for diagrams, and Tables 4-7 and 4-8 for jumper tables describing how to set the jumpers for using each interface type.
  • Page 101 SMS-758 Modem Protection Switch Theory of Operation Primary Alarm Out PRI_COM PRI_NO PRI_NC Secondary Alarm Out SEC_COM SEC_CO SEC_NO Modulator Fault Demodulator Fault TRANSMIT DATA TRANSMIT DATA TRANSMIT ESC TRANSMIT ESC RECEIVE DATA TX S/B RECEIVE DATA RECEIVE ESC RECEIVE ESC...
  • Page 102 Theory of Operation SMS-758 Modem Protection Switch DATA PATH SELECTION TRANSMIT DATA TRANSMIT ESC RECEIVE DATA RECEIVE ESC RECEIVE EXTERNAL REFERENCE CLOCK MOD AND DEMOD FAULTS MOD RELAYS INSTRUCTION BACKUP DECODER DEMOD RELAYS DATA I/O DATA SWITCH MOTHERBOARD Figure 4-15. Backup 2:N IBS Interface Switch (1694) 4–42...
  • Page 103 SMS-758 Modem Protection Switch Theory of Operation ..Rev A Location Rev - Location AS/1695 PRIME INTERFACE SWITCH ....
  • Page 104 Theory of Operation SMS-758 Modem Protection Switch AS/1694 BACKUP INTERFACE ..SWITCH ..Figure 4-17. Backup IBS Jumper Diagram Table 4-8. Backup IBS Jumpers Operation Jumper Pins Comments...

  • Page 105: Address Decoder/Driver

    SMS-758 Modem Protection Switch Theory of Operation 4.7 Address Decoder/Driver The address decoder/driver is a 10.5” x 3.5” module (Figure 4-18) that fits in slot 4 of the front upper section of the switch chassis. Its functions include address decoding of the external address bus, external data bus buffering, serial communications interface, modem fault interface, and fault outputs.
  • Page 106 Theory of Operation SMS-758 Modem Protection Switch EXT CONTROL BUS DATA BUS AND ADDRESS CONTROL SIGNALS DECODE AND INTERNAL CONTROL BUS DATA BUS ADDRESS FAULT BUFFER LATCH DMD SYSTEM FAULT CONTROL FAULT RELAY-REMOTE INTERFACE RS-485 ASYNCHRONOUS COMMUNICATIONS INTERFACE DEVICE EXT INTERFACE CONTROL...

  • Page 107: If Switch Driver

    SMS-758 Modem Protection Switch Theory of Operation 4.8 IF Switch Driver The IF switch driver (Figure 4-19) is a 10.5” x 3.5” module that fits in slot 3 of the upper front section of the switch chassis. It controls activation of the baseball switches on the IF switch card.

  • Page 108: If Switch

    Theory of Operation SMS-758 Modem Protection Switch 4.9 IF Switch The IF switch is a 14” x 5” module that fits in the upper rear section of the switch chassis. The IF switch isolates the backup modulator’s IF outputs, and connects the backup modulator’s output in place of any of the prime modulators when a fault is...
  • Page 109 SMS-758 Modem Protection Switch Theory of Operation DEMODULATOR SWITCH DEMODULATOR SWITCH INPUTS OUTPUTS BU MOD 2 BU MOD 1 INPUTS IF 1 MOD 1 DOWNLINK 4 MOD 2 IF 2 DOWNLINK 3 DOWNLINK 2 MOD 3 IF 3 DOWNLINK 1...

  • Page 110: Online Telemetry

    Theory of Operation SMS-758 Modem Protection Switch 4.10 Online Telemetry The online telemetry (Figure 4-22) is a 10.5” x 3.5” module that fits in slot 6 of the upper front section of the switch chassis. It reports the online status of each prime modulator and demodulator.
  • Page 111 SMS-758 Modem Protection Switch Theory of Operation Figure 4-22. Online Telemetry MOD 1 ONLINE STATUS DEMOD 1 ONLINE STATUS CONTROL BUS RELAY INSTRUCTION DRIVER LATCH MOD 8 ONLINE STATUS DEMOD 8 ONLINE STATUS Figure 4-23. Online Telemetry Block Diagram MN/SMS758 Rev. 3...

  • Page 112: Power Supply

    Theory of Operation SMS-758 Modem Protection Switch 4.11 Power Supply The power supply modules fit in slots 1 or 7 of the upper front section of the switch chassis. In slot 7, the supply is inverted. The supplies are enclosed in a 10.5” x 3.5” x 2.5” metal frame that encloses the power supply assembly, provides power switch access, and secures in the chassis.

  • Page 113: Chapter 5. Maintenance

    Chapter 5. MAINTENANCE 5.1 Fault Descriptions The FAULT menu, [NEXT], and [PREV] keys allow the operator to determine the cause of any switch faults indicated by a red LED. The following sections describe the faults and their probable causes. 5.1.1 Modulator Operation Fault A MOD fault occurs when a modulator backup operation fails.

  • Page 114: M:n Faults

    Maintenance SMS-758 Modem Protection Switch 5.1.3 M:N Faults An M:N fault occurs when a communication, configuration, setup, and/or power supply failure occurs. The cause of the failure can be one of the following: • Modem communication failure due to incorrect:...

  • Page 115: Fault Isolation

    SMS-758 Modem Protection Switch Maintenance 5.2 Fault Isolation The following tables list the procedures for clearing fault indications in the fault menu or the remote interface (remote interface messages are listed in parentheses). The tables list the fault messages on the left and the procedures on the right. To clear the fault or to determine why the fault remains, be sure to perform the steps in the order listed.

  • Page 116: Demodulator Operation

    Maintenance SMS-758 Modem Protection Switch 5.2.2 Demodulator Operation Faults Procedures BK-UP FAULT DMD X If no M:N faults exist: (DOF_BU_OP_FLT_x) Verify that the switch is in AUTO mode. Verify that a backup demodulator is available to backup all of the faulted prime demodulators.

  • Page 117: M:n Operation

    SMS-758 Modem Protection Switch Maintenance 5.2.3 M:N Operation Faults Procedures MODEM (B)X COMM FAILURE Verify that the modem baud rate is set to 9600. (COM_FLT_(B)x) Verify that the modem interface type is RS-485. Verify that the modem parity is even.

  • Page 118: Battery

    Maintenance SMS-758 Modem Protection Switch 5.2.4 Battery Faults Procedures M&C BATTERY FAULT Check the position of the internal battery jumper on the M&C (M&C_BAT_FLT) board. Check the battery for bent or displaced leads. The NiCad battery on the M&C board is rechargeable and may require up to 48 hrs.

  • Page 119: Module Replacement

    SMS-758 Modem Protection Switch Maintenance 5.3 Module Replacement Most modules in the switch are designed for easy replacement. Before removing or inserting any module, turn OFF both power supplies. This equipment contains parts and assemblies sensitive to damage by ESD.

  • Page 120: If Switch

    Maintenance SMS-758 Modem Protection Switch 5.3.2 IF Switch The IF switch module is located in the upper rear section of the switch. 1. Turn OFF both power supplies. 2. Remove all hex nuts on the rear of the switch. 3. Remove the upper two screws that hold the upper section to the side panels.

  • Page 121: Online Telemetry

    SMS-758 Modem Protection Switch Maintenance 5.3.6 Online Telemetry The online telemetry module is located in slot 6 of the upper front section of the switch. 1. Turn OFF both power supplies. 2. Rotate the card ejector to extract the module.
  • Page 122 Maintenance SMS-758 Modem Protection Switch This page is intentionally left blank. 5–10 MN/SMS758 Rev. 3...

  • Page 123: Appendix A. Remote Control Operation: Modem Switch

    MODEM SWITCH This appendix defines the protocol and command structure for the “modem switch” style of remote control and status monitoring of the EFData SMS-758 switch. With modem switch software, when the switch detects either a modulator or demodulator failure on the prime modem, both the modulator and demodulator functions will be switched to the backup modem.

  • Page 124: Start Character

    Remote Control Operation SMS-758 Modem Protection Switch Messages on the remote link fall into the categories of commands and responses. Commands are messages which are transmitted to a satellite modem switch, while responses are messages returned by a satellite modem switch in response to a command.

  • Page 125: Command/Responses

    SMS-758 Modem Protection Switch Remote Control Operation A.2.3 Command/Responses The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a satellite modem switch 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 126: Configuration Commands/Responses

    Remote Control Operation SMS-758 Modem Protection Switch A.3 Configuration Commands/Responses A.3.1 Modulator Configuration Commands/Responses A.3.1.1 Prime Modulator Active Command: <add/MA_x_yyy”cr” Response: >add/MA_x_yyy”cr” Status Only: <add/MA_x”cr” Response: >add/MA_x_yyy”cr””lf”] Where: x = 1 to 8 (prime modulator number). yyy = YES or NO.

  • Page 127: Prime Demodulator Transponder

    SMS-758 Modem Protection Switch Remote Control Operation A.3.2.2 Prime Demodulator Transponder Command: <add/DT_x_y”cr” Response: >add/DT_x_y”cr””lf”] Status Only: <add/DT_x”cr” Response: >add/DT_x_y”cr””lf”] Where: x = 1 to 8 (prime demodulator number). y = 1, 2, 3, or 4 (transponder number, four transponders option).

  • Page 128: Backup Modem Address

    Remote Control Operation SMS-758 Modem Protection Switch A.3.3.2 Backup Modem Address Address “0” may be used to clear the address field of modem “x”. Command: <add/ADD_Bx_yyy”cr” Response: >add/ADD_Bx_yyy”cr””lf”] Status Only: <add/ADD_Bx”cr” Response: >add/ADD_Bx_yyy”cr””lf”] Where: x = 1 to 8 (backup modem number).

  • Page 129: Modem Priority

    A.3.4 Status Commands/Responses A.3.4.1 Configuration Status A.3.4.1.1 Prime Modulator Configuration Status The Prime Modulator Configuration Status command causes a block of data to be returned by the SMS-758. The block of data reflects the stored configuration of the modulator selected. Command: <add/MCS_x”cr”...

  • Page 130: Backup Modulator Configuration Status

    SMS-758 Modem Protection Switch A.3.4.1.2 Backup Modulator Configuration Status The Backup Modulator Configuration Status command causes a block of data to be returned by the SMS-758. The block of data reflects the stored configuration of the modulator selected. Command: <add/MCS_Bx”cr”...

  • Page 131: Modulator Status

    SMS-758 Modem Protection Switch Remote Control Operation A.3.4.2 Modulator Status The modulator status is returned as a block of data which provides basic status information of all “active” modulators. B1 and B2 are the backup modulators. Command: <add/MS_”cr” Response: >add/MS_”cr”...

  • Page 132: Backup Modem Fault Status

    Remote Control Operation SMS-758 Modem Protection Switch A.3.4.5 Backup Modem Fault Status Command: <add/MFS_Bx”cr” Response: >add/MFS_Bx”cr” Mod Status (OK/FLT) MOD_yyy”cr” Demod Status (OK/FLT) DMD_yyy”cr””lf”] Where: x = 1 or 2 (backup modem number). A.3.4.6 Firmware Version Status Command: <add/VER_”cr” Response: >add/VER_x.xxx”cr””lf”]...

  • Page 133: Date

    = year. Example: Set switch 235 date to 11/30/87. Command: <235/DATE_11/30/87”cr” Response: >235/DATE_11/30/87”cr””lf”] A.3.5.3 Mode Command The Mode Command directs the SMS-758 to enter the specified mode. Command: <add/MODE_yyyyyy”cr” Response: >add/MODE_yyyyyy”cr” Status Only: <add/MODE_”cr” Response: >add/MODE_yyyyyy”cr””lf”] Where: yyyyyy = REMOTE, LOCAL, AUTO, or BYPASS.

  • Page 134: Load Modem Configuration(S

    Remote Control Operation SMS-758 Modem Protection Switch A.3.5.5 Load Modem Configuration(s) These commands tell the switch to poll the specified modems for configuration information (via the modem remote control serial communications link). Configurations received without error are loaded into the switches memory.

  • Page 135: Load Backup Modem Configuration

    SMS-758 Modem Protection Switch Remote Control Operation A.3.5.5.3 Load Backup Modem Configuration Command: <add/LMC_Bx”cr” Response: >add/LMC_Bx”cr” MOD_Bx_yyy”cr” DMD_Bx_yyy”cr””lf”] Where: x = 1 or 2 (backup modem number). yyy = OK or FLT. A.3.5.6 Verify Modem Configuration(s) These commands tell the switch to poll the specified modem(s) for configuration information (via the modem remote control serial communications link).

  • Page 136: Verify Prime Modem Configuration

    Remote Control Operation SMS-758 Modem Protection Switch A.3.5.6.2 Verify Prime Modem Configuration Command: <add/VMC_x”cr” Response: >add/VMC_x”cr” MOD_x_yyy”cr” DMD_x_yyy”cr””lf”] Where: x = 1 to 8 (prime modem number). yyy = OK or FLT. A.3.5.6.3 Verify Backup Modem Configuration Command: <add/VMC_Bx”cr” Response: >add/VMC_Bx”cr”...

  • Page 137: M:n Switch Fault Status Summary

    SMS-758 Modem Protection Switch Remote Control Operation A.3.5.7.3 M:N Switch Fault Status Summary Command: <add/MNF_”cr” Response: >add/MNF_”cr” Modem communications faults COM_FLT_xxxxxxxxByBy”cr” (see Note) Mod configuration verify faults MOD_CONFIG_FLT_xxxxxxxxByBy”cr” (see Note) Demod configuration verify faults DMD_CONFIG_FLT_xxxxxxxxByBy”cr” (see Note) Mod compatibility fault MOD_COMPAT_FLT_xxxxxxxxByBy”cr”...

  • Page 138: Bulk Consolidated Status Faults

    Remote Control Operation SMS-758 Modem Protection Switch A.3.5.7.5 Bulk Consolidated Status Faults This command causes all switch 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 139 SMS-758 Modem Protection Switch Remote Control Operation Character “e”: Modulator operational fault status character 1. Bit 6 = 1 always. Bit 5 = Prime modulator #1 backup operational fault. Bit 4 = Prime modulator #2 backup operational fault. Bit 3 = Prime modulator #3 backup operational fault.
  • Page 140 Remote Control Operation SMS-758 Modem Protection Switch Character “k”: Modulator configuration verify fault status character 2. Bit 6 = 1 always. Bit 5 = Prime modulator #7 configuration verify fault. Bit 4 = Prime modulator #8 configuration verify fault. Bit 3 = Backup modulator #1 configuration verify fault.
  • Page 141 SMS-758 Modem Protection Switch Remote Control Operation Character “q”: Demodulator compatibility fault status character 2. Bit 6 = 1 always. Bit 5 = Prime demodulator #7 compatibility fault. Bit 4 = Prime demodulator #8 compatibility fault. Bit 3 = Backup demodulator #1 compatibility fault.
  • Page 142 Remote Control Operation SMS-758 Modem Protection Switch Character “w”: Missing parameters fault status character 4. Bit 6 = 1 always. Bit 5 = No configuration for prime demodulator #7 fault. Bit 4 = No configuration for prime demodulator #8 fault.

  • Page 143: Downlink Transponder Option

    Bit 0 = Reserved. A.3.5.8 Downlink Transponder Option This command configures the SMS-758 for cabling options that support four or seven downlink transponders. When this option is set to “4”, two backup modems may be specified with four downlinks available to each backup modem. If this option is set to “7”, one backup modem (backup #1) may be specified with seven downlinks available to...
  • Page 144 Remote Control Operation SMS-758 Modem Protection Switch This page is intentionally left blank. A–22 MN/SMS758 Rev. 3...

  • Page 145: Appendix B. Remote Control Operation: Independent Mod/Demod

    Appendix B. REMOTE CONTROL OPERATION: INDEPENDENT MOD/DEMOD This appendix defines the protocol and command structure for remote control and status monitoring of the EFData SMS-758 switch. • Firmware number: FW/0713-36L • Software version: 6.1.2 B.1 General Remote controls and status information are transferred via an RS-485 (optional RS-232C) serial communications link.

  • Page 146: Start Character

    Remote Control Operation SMS-758 Modem Protection Switch The general message structure is as follows: • Start Character • Device Address • Command/Response • End of Message Character B.2.1 Start Character A single character precedes all messages transmitted on the remote link. This character flags the start of a message.

  • Page 147: Command/Responses

    SMS-758 Modem Protection Switch Remote Control Operation B.2.3 Command/Responses The command/response portion of the message contains a variable length character sequence which conveys command and response data. If a modem protection switch 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 148: Configuration Commands/Responses

    Remote Control Operation SMS-758 Modem Protection Switch B.3 Configuration Commands/Responses B.3.1 Modulator Configuration Commands/Responses B.3.1.1 Prime Modulator Active Command: <add/MA_x_yyy”cr” Response: >add/MA_x_yyy”cr” Status Only: <add/MA_x”cr” Response: >add/MA_x_yyy”cr””lf”] Where: x = 1 to 8 (prime modulator number). yyy = YES or NO.

  • Page 149: Backup Modulator Active

    SMS-758 Modem Protection Switch Remote Control Operation B.3.1.4 Backup Modulator Active Command: <add/MA_Bx_yyy”cr” Response: >add/MA_Bx_yyy”cr””lf”] Status Only: <add/MA_Bx”cr” Response: >add/MA_Bx_yyy”cr””lf”] Where: x = 1 or 2 (backup modulator number). yyy = YES or NO. B.3.2 Demodulator Configuration Commands/Responses B.3.2.1 Prime Demodulator Active Command: <add/DA_x_yyy”cr”...

  • Page 150: Prime Demodulator Transponder

    Remote Control Operation SMS-758 Modem Protection Switch B.3.2.3 Prime Demodulator Transponder Command: <add/DT_x_y”cr” Response: >add/DT_x_y”cr””lf”] Status Only: <add/DT_x”cr” Response: >add/DT_x_y”cr””lf”] Where: x = 1 to 8 (prime demodulator number). y = 1, 2, 3 or 4 (transponder number, four transponders option).

  • Page 151: Modem Configuration Commands/Responses

    SMS-758 Modem Protection Switch Remote Control Operation B.3.3 Modem Configuration Commands/Responses B.3.3.1 Prime Modem Address Address “0” may be used to clear the address field of modem “x”. Command: <add/ADD_x_yyy”cr” Response: >add/ADD_x_yyy”cr””lf”] Status Only: <add/ADD_x”cr” Response: >add/ADD_x_yyy”cr””lf”] Where: x = 1 to 8 (prime modem number).

  • Page 152: Backup Modem Interface Type

    B.3.4 Status Commands/Responses B.3.4.1 Configuration Status B.3.4.1.1 Prime Modulator Configuration Status The Modulator Configuration Status command causes a block of data to be returned by the SMS-758. The block of data reflects the stored configuration of the modulator selected. Command: <add/MCS_x”cr”...
  • Page 153 SMS-758 Modem Protection Switch Remote Control Operation Where: x = 1 or 2 (backup modem number). MN/SMS758 Rev. 3 B–9...

  • Page 154: Prime Demodulator Configuration Status

    Remote Control Operation SMS-758 Modem Protection Switch B.3.4.1.3 Prime Demodulator Configuration Status The Demodulator Configuration Status command causes a block of data to be returned by the SMS-758. The block of data reflects the stored configuration of the demodulator selected. Command: <add/DCS_x”cr”...

  • Page 155: Demodulator Status

    SMS-758 Modem Protection Switch Remote Control Operation B.3.4.3 Demodulator Status The demodulator status is returned as a block of data which provides basic status information of all “active” demodulators. B1 and B2 are the backup demodulators. Command: <add/DS_”cr” Response: >add/DS_”cr”...

  • Page 156: Equipment Type

    Remote Control Operation SMS-758 Modem Protection Switch B.3.4.7 Equipment Type This command returns the equipment type polled and the software version. Command: <add/ET_”cr” Response: >add/ET_xxx_yyy”cr””lf”] Where: xxx = Equipment type. yyy = Software version. B.3.5 Operational Commands B.3.5.1 Time of Day Command: <add/TIME_hh:mmyy”cr”...

  • Page 157: Mode Command

    SMS-758 Modem Protection Switch Remote Control Operation B.3.5.3 Mode Command The Mode command directs the SMS-758 to enter the specified mode. Command: <add/MODE_yyyyyy”cr” Response: >add/MODE_yyyyyy”cr” Status Only: <add/MODE_”cr” Response: >add/MODE_yyyyyy”cr””lf”] Where: yyyyyy = REMOTE, LOCAL, AUTO, or BYPASS. B.3.5.4 Set Backup Modulator Online/Offline The modulator online command puts the specified backup modulator online for the specified prime modulator.

  • Page 158: Load Modem Configuration(S

    Remote Control Operation SMS-758 Modem Protection Switch B.3.5.6 Load Modem Configuration(s) These commands tell the switch to poll the specified modems for configuration information (via the modem remote control serial communications link). Configurations received without error are loaded into the switches memory.

  • Page 159: Load Backup Modem Configuration

    SMS-758 Modem Protection Switch Remote Control Operation B.3.5.6.3 Load Backup Modem Configuration Command: <add/LMC_Bx”cr” Response: >add/LMC_Bx”cr” MOD_Bx_yyy”cr” DMD_Bx_yyy”cr””lf”] Where: x = 1 or 2 (backup modem number). yyy = OK or FLT. B.3.5.7 Verify Modem Configuration(s) These commands tell the switch to poll the specified modem(s) for configuration information (via the modem remote control serial communications link).

  • Page 160: Verify Prime Modem Configuration

    Remote Control Operation SMS-758 Modem Protection Switch B.3.5.7.2 Verify Prime Modem Configuration Command: <add/VMC_x”cr” Response: >add/VMC_x”cr” MOD_x_yyy”cr” DMD_x_yyy”cr””lf”] Where: x = 1 to 8 (prime modem number). yyy = OK or FLT. B.3.5.7.3 Verify Backup Modem Configuration Command: <add/VMC_Bx”cr” Response: >add/VMC_Bx”cr”...

  • Page 161: M:n Switch Fault Status Summary

    SMS-758 Modem Protection Switch Remote Control Operation B.3.5.8.3 M:N Switch Fault Status Summary Command: <add/MNF_”cr” Response: >add/MNF_”cr” Modem communications faults COM_FLT_xxxxxxxxByBy”cr” (see Note) Mod configuration verify faults MOD_CONFIG_FLT_xxxxxxxxByBy”cr” (see Note) Demod configuration verify faults DMD_CONFIG_FLT_xxxxxxxxByBy”cr” (see Note) Mod compatibility fault MOD_COMPAT_FLT_xxxxxxxxByBy”cr”...

  • Page 162: Bulk Consolidated Status Faults

    Remote Control Operation SMS-758 Modem Protection Switch B.3.5.8.5 Bulk Consolidated Status Faults This command causes all switch 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 163 SMS-758 Modem Protection Switch Remote Control Operation Character “f”: Modulator operational fault status character 2. Bit 6 = 1 always. Bit 5 = Prime modulator #7 backup operational fault. Bit 4 = Prime modulator #8 backup operational fault. Bit 3 = Reserved.
  • Page 164 Remote Control Operation SMS-758 Modem Protection Switch Character “l”: Demodulator configuration verify fault status character 1. Bit 6 = 1 always. Bit 5 = Prime demodulator #1 configuration verify fault. Bit 4 = Prime demodulator #2 configuration verify fault. Bit 3 = Prime demodulator #3 configuration verify fault.
  • Page 165 SMS-758 Modem Protection Switch Remote Control Operation Character “r”: Common equipment fault status character 1. Bit 6 = 1 always. Bit 5 = +12 volt fault. Bit 4 = -12 volt fault. Bit 3 = +5 volt fault. Bit 2 = Power supply #1 fault.
  • Page 166 Remote Control Operation SMS-758 Modem Protection Switch Character “x”: Missing parameters fault status character 5. Bit 6 = 1 always. Bit 5 = No address specified for prime modem #1 fault. Bit 4 = No address specified for prime modem #2 fault.

  • Page 167: Downlink Transponder Option

    Bit 0 = Reserved. B.3.5.9 Downlink Transponder Option This command configures the SMS-758 for cabling options that support four or seven downlink transponders. When this option is set to “4”, two backup modems may be specified with four downlinks available to each backup modem. If this option is set to “7”, one backup modem (backup #1) may be specified with seven downlinks available to...

  • Page 169: Appendix C. 7 Downlink Option

    Appendix C. 7 DOWNLINK OPTION This appendix describes the 7 downlink option installed in the SMS-758. Operation of the switch is basically the same as in 4 downlink/2 backup mode, except that only one backup is used. Refer to Appendixes A and B for remote control information.

  • Page 170: External Connections

    7 Downlink Option SMS-758 Modem Protection Switch C.1 External Connections The external connections for the 7 downlink option are slightly different than the standard SMS-758. Make sure the rear panel sticker supplied with this appendix has been properly installed. The only connectors that are different are J7 through J16, the downlink inputs, and backup demod outputs.

  • Page 171: Downlink Inputs (J8 Through J10, J12 Through J15

    SMS-758 Modem Protection Switch 7 Downlink Option C.1.3 Downlink Inputs These are the downlink input connectors. These connections provide the inputs to the downlink switching matrix. Connectors J12 through J15 are the downlink inputs 1 through 4. When the 7 downlink option is being used, connectors J8 through J10 are the downlink inputs 5 through 7.
  • Page 172 7 Downlink Option SMS-758 Modem Protection Switch This page is intentionally left blank. C–4 MN/SMS758 Rev. 3...

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