Radyne DMD20 Installation And Operation Manual
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Radyne DMD20 Installation And Operation Manual

Universal satellite modem
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DMD20
Universal Satellite Modem

Installation and Operation Manual

TM103
Revision 1.1
Radyne ComStream Corp. • 3138 E. Elwood St. • Phoenix, AZ 85034 • (602) 437-9620 • Fax: (602) 437-4811 • www.radn.com

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  • Page 1: Installation And Operation Manual

    DMD20 Universal Satellite Modem Installation and Operation Manual TM103 Revision 1.1 Radyne ComStream Corp. • 3138 E. Elwood St. • Phoenix, AZ 85034 • (602) 437-9620 • Fax: (602) 437-4811 • www.radn.com...
  • Page 3 Unless otherwise agreed, failure shall be deemed to have occurred no more than seven (7) working days before the first date on which Radyne ComStream Corporation receives a notice of failure. Under no circumstances shall any warranty exceed the period stated above unless expressly agreed to in writing by Radyne ComStream Corporation.
  • Page 4 Before a warranty repair can be accomplished, a Repair Authorization must be received. It is at this time that Radyne ComStream Corporation will authorize the product or part to be returned to the Radyne ComStream Corporation facility or if field repair will be accomplished. The Repair Authorization may be...
  • Page 5 Preface Preface This manual provides installation and operation information for the Radyne ComStream Corporation DMD20 Universal Satellite Modem. This is a technical document intended for use by engineers, technicians, and operators responsible for the operation and maintenance of the DMD20.
  • Page 6 Radyne ComStream Corporation assumes no responsibility for use of any circuitry other than the circuitry employed in Radyne ComStream Corporation systems and equipment. Furthermore, since Radyne ComStream Corporation is constantly...

  • Page 7: Table Of Contents

    Section 3 – Theory of Operation 3.0 DMD20 Hardware __________________________________________________ 3-1 3.0.1 DMD20 L-Band/IF Printed Circuit Card ________________________________ 3-1 3.0.2 DMD20 Baseband Processing Printed Circuit Card ______________________ 3-2 3.0.3 Enhanced Interface Printed Circuit Card _______________________________ 3-4 3.1 DMD20 Functional Block Diagram _____________________________________ 3-4 3.1.1 Front Panel ______________________________________________________ 3-4...
  • Page 8 3.4 Modem Status _____________________________________________________ 3-7 3.5 Baseband Processor Card ___________________________________________ 3-8 3.5.1 Baseband Processing______________________________________________ 3-8 3.6 DMD20 Clocking Options ___________________________________________ 3-11 3.6.1 SCTE: Serial Clock Transmit External ________________________________ 3-11 3.6.2 SCT: Serial Clock Transmit ________________________________________ 3-11 3.6.4 EXT CLK: External Clock __________________________________________ 3-11 3.6.5 BNC EXC: BNC External Clock _____________________________________ 3-11...
  • Page 9 3.14.1 Reed-Solomon Operation in the DMD20 _____________________________ 3-20 3.14.2 Reed-Solomon Code Rate ________________________________________ 3-20 3.14.3 Interleaving ____________________________________________________ 3-20 3.15 DMD20 Automatic Uplink Power Control (AUPC Operation) _______________ 3-22 3.16 Asynchronous Overhead Operation (Framing/Multiplexer Capability) ________ 3-23 3.17 Standard IBS Mode _______________________________________________ 3-24 3.18 Asynchronous Multiplexer Mode ____________________________________ 3-25...
  • Page 10 Table of Contents DMD20 Universal Satellite Modem 4.5.1 Operational Case Examples________________________________________ 4-32 4.6 Configuring the DMD20 for Drop and Insert _____________________________ 4-35 4.6.1 Data Rate ______________________________________________________ 4-35 4.6.2 Operational Network Specification ___________________________________ 4-36 4.6.3 Terrestrial Framing - Drop Mode/Insert Mode __________________________ 4-36 4.6.3.1 Insert Terrestrial Frame Source ___________________________________ 4-37...
  • Page 11 7.0 Data Rates ________________________________________________________ 7-1 7.1 Modulator _________________________________________________________ 7-1 7.2 Demodulator ______________________________________________________ 7-1 7.3 Plesiochronous Buffer _______________________________________________ 7-2 7.4 BER Performance __________________________________________________ 7-2 7.5 Monitor and Control _________________________________________________ 7-2 7.6 DMD20 Drop and Insert (Optional) _____________________________________ 7-2 TM103 – Rev. 1.1...
  • Page 12 7.8 IDR/ESC Interface (Optional) _________________________________________ 7-3 7.9 IBS/Synchronous Interface (Standard) __________________________________ 7-3 7.10 Environmental ____________________________________________________ 7-3 7.11 Physical _________________________________________________________ 7-3 7.12 DMD20 Data Rate Limits ____________________________________________ 7-3 7.13 DMD20 BER Specifications__________________________________________ 7-5 7.13.1 Modem BER Performance (Viterbi) __________________________________ 7-5 7.13.2 8PSK Trellis Decoder 8PSK________________________________________ 7-5 7.13.3 Trellis Decoder and Reed-Solomon __________________________________ 7-5...
  • Page 13 DMD20 Universal Satellite Modem Table of Contents Glossary____________________________________________________________ G-1 TM103 – Rev. 1.1 xiii...
  • Page 14 Table of Contents DMD20 Universal Satellite Modem TM103 - Rev. 1.1...

  • Page 15: Section 1 - Introduction

    DMD20 Universal Satellite Modem Introduction Section 1 - Introduction This chapter provides an overview of the DMD20 Universal Satellite Modem, referred to in this manual as “the modem” or “the unit.” 1.0 Overview The Radyne ComStream Corporation DMD20 Universal Satellite Modem (Figure 1-1) offers the best features of a sophisticated programmable IBS/IDR and Closed Network Modem, at an affordable price.

  • Page 16: Features/Options Installed At Time Of Order

    Hardware options (refer to Appendix A) are purchased parts that can be installed into the unit at the customer’s site. A screwdriver is normally the only tool required. Please contact the Radyne ComStream Corporation Customer Service Department for information not limited to availability and to shipping costs.

  • Page 17: Section 2 - Installation

    2.0 Installation Requirements The DMD20 Modem is designed to be installed within any standard 19 inch (48.26 cm) wide equipment cabinet or rack, and requires one rack unit (RU) of mounting space (1.75 inches/4.45 cm) vertically and 16.0 inches (40.64 cm) of depth. Including cabling, a minimum of 19.5 inches (49.53 cm) of rack depth is required.

  • Page 18: Unpacking

    Do not mount the DMD20 in an unprotected outdoor location where there is direct contact with rain, snow, wind or sun. The only tools required for rack mounting the DMD20 are four (4) customer supplied rack-mounting screws and the appropriate screwdriver. Rack mounting brackets are an integral part of the front bezel of the unit and are not removable.

  • Page 19: Dmd20 Initial Configuration Check

    Installation 2.4 DMD20 Initia l Configuration Check The DMD20 is shipped from the factory with preset factory defaults. Upon initial power-up, a user check should be performed to verify the shipped modem configuration. Refer to Section 4, User Interfaces to locate and verify that the following configuration settings are correct: The DMD20 Interface Type (V.35, RS-422, RS-232, G.703, etc.) MUST be...

  • Page 20: Modulator Checkout

    To lock up the modem, enter ‘IF Loopback Enable’ under the Test Menu, or connect a Loopback Cable from J1 to J2 on the rear panel of the modem. 2.5 Modulator Checkout The following descriptions assume that the DMD20 is installed in a suitable location with prime AC power and supporting equipment available. 2.5.1 Initial Power-Up Before initial power up of the DMD20, it is a good idea to disconnect the transmit output from the operating ground station equipment.

  • Page 21: Terminal Setup

    DMD20 Universal Satellite Modem Installation 2.5.2 Terminal Setup The terminal setup is as follows: Baud Rate: 19.2 K (Can be changed via Front Panel) Data Bits: Parity: No Parity (Fixed) Stop Bits: 1 Stop Bit 2.6 Storage It is recommended that the unit be stored in its original sealed packing. The unit should be stored in a dry location where the temperature is stable, away from direct contact with rain, snow, wind, sun, or anything that may cause damage.
  • Page 22 Installation DMD20 Universal Satellite Modem TM103 - Rev. 1.1...

  • Page 23: Section 3 - Theory Of Operation

    L-Band/IF Assembly and a Digital Baseband Assembly. The optional printed circuit cards include a Turbo Codec printed circuit card and one of several types of Interface printed circuit card (refer to Appendix A). A block diagram of the DMD20 is shown in Figure 3.1. Figure 3-1. DMD20 Block Diagram 3.0.1 DMD20 L-Band/IF Printed Circuit Card...

  • Page 24: Dmd20 Baseband Processing Printed Circuit Card

    Flash memory available to the system microprocessor for storage of configuration files. The DMD20 Baseband Processing Printed Circuit Card provides a flexible architecture that allows many different modes of terrestrial and satellite framing, various FEC options, digital voice processing, and several different modulation/demodulation formats.
  • Page 25 The M&C System is based on a powerful microprocessor with a large amount of Flash memory. Several bus architectures are used to interconnect the M&C to all components of the DMD20. Communication to the outside world is done via connections to the remote port, terminal port, Ethernet port, and alarm ports.

  • Page 26: Enhanced Interface Printed Circuit Card

    3.1 DMD20 Functional Block Diagram Figure 3-4 represents the DMD20 Functional Blocks. The modem is shown in a typical application with customer data, Tx/Rx RF equipment and an antenna. Figure 3-4. DMD20 Universal Satellite Modem Functional Block Diagram 3.1.1 Front Panel...

  • Page 27: Baseband Processing

    DMD20 Universal Satellite Modem Theory of Operation 3.1.2 Baseband Processing The Baseband Processor performs all of the functions required for an IBS/IDR Framing Unit, a Reed-Solomon Codec, and an E1/T1 Drop and Insert System. In addition, the Baseband Processing Section provides for transmit clock selection and rate adaptation as well as a rate adapter and Plesiochronous/Doppler (PD) Buffer in the receive direction.

  • Page 28: Monitor & Control (M&C) Subsystem

    Theory of Operation DMD20 Universal Satellite Modem Figure 3-5. DMD20 Clock Logic Rx Baseband Processing 3.1.6 Monitor & Control (M&C) Subsystem Also contained on the BB Card is the M&C Subsystem. The M&C contains a high-performance microprocessor and is responsible for overall command and control of modem functions. The M&C is constantly monitoring all subsystems of the modem by performing a periodic poll routine...

  • Page 29: Remote Port

    DMD20 Universal Satellite Modem Theory of Operation 3.1.6.2 Remote Port This port is dedicated to the Modem Remote Port. This port supports an asynchronous control protocol as described in Section 4. It may be configured to support either RS-232 or RS-485 signal levels.

  • Page 30: Baseband Processor Card

    Theory of Operation DMD20 Universal Satellite Modem Form-C Contacts: The UIM provides three Form-C Relays under processor control that appear at J11. Mod Fault: De-energized when any transmit side fault is detected. Demod Fault: De-energized when any receive side fault is detected.
  • Page 31 DMD20 Universal Satellite Modem Theory of Operation Figure 3-6. Loopback Functional Block Diagram TM103 – Rev. 1.1...
  • Page 32 Theory of Operation DMD20 Universal Satellite Modem Figure 3-7. Loopback Functional Block Diagram Figure 3-8. Loopback Functional Block Diagram 3-10 TM103 - Rev. 1.1...

  • Page 33: Dmd20 Clocking Options

    DMD20 Universal Satellite Modem Theory of Operation 3.6 DMD20 Clocking Options The following paragraphs define the types of clocking options available to the user at the Front Panel of the DMD20: 3.6.1 SCTE: Serial Clock Transmit External This clock is the Transmit Terrestrial Clock associated with the interface. With the G.703 Interface selected, SCTE is the clock that is recovered from the G.703 data stream.

  • Page 34: Ext If Ref: External If Reference

    This is not actually a clock, but does have some clocking implications. When the external reference is used, the master oscillator within the DMD20 is locked to the external reference, and the internal accuracy and stability of the DMD20 assumes that of the External Reference.

  • Page 35: Transmit (Rs-422 Or V.35 Interface)

    Select the Buffer clock to RxSAT (SCR). 3.10 Drop and Insert (D&I) The Radyne DMD20 Drop and Insert (D&I) Function provides an interface between a full T1 or E1 Trunk whose framing is specified in CCITT G.704 and a fractional Nx64 Kbps Satellite Channel that conforms to the IBS and small IDR Framing Structures.
  • Page 36 Theory of Operation DMD20 Universal Satellite Modem Figure 3-10. Looped Modems Figure 3-11. Looped Modems with Separate D&I Trunks 3-14 TM103 - Rev. 1.1...

  • Page 37: Drop Only

    Theory of Operation 3.10.1 Drop Only When Drop is enabled and Insert is disabled, the DMD20 performs a drop-only function. Framed E1 or T1 Data is input via the Send Data In Port, the selected timeslots are dropped into the IBS frame structure, and the unaltered terrestrial data is output via the Send Data Out Port (refer to Figure 3-12).

  • Page 38: Mode Selection

    Figure 3-14. Insert Only with Internal Frame Source 3.11 Mode Selection The DMD20 D&I can be easily configured to support several commonly used terrestrial data formats. For E1 Data, the user can choose between PCM-30, PCM-30C, PCM-31 and PCM -31C.

  • Page 39: Pcm-31C

    = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, or 30. In the DMD20, Robbed Bit Signaling (RBS) is handled without any need for operator intervention and is transparent to the user.
  • Page 40 Theory of Operation DMD20 Universal Satellite Modem Figure 3-15. Multidestinational Communications Example : For a modem w/ Drop & Insert enabled at a data rate of 256 (with timeslots assigned 1 - 1, 2 - 2, etc.). At a data rate of 256, the modem will allow 4 channels to assign timeslots to. Under the Tx Menu, assign the timeslots that are to be used to the 4 channels.
  • Page 41 DMD20 Universal Satellite Modem Theory of Operation For the Transmit Side: Push <ENTER> to get the flashing cursor. Use the Up Arrow Key to make the left portion of the display read “TX EDIT”. Use the Right or Left Arrow Keys to switch the flashing cursor to the right portion of the display.

  • Page 42: Reed-Solomon Codec

    R-S code rate for IDR/IBS open network operation in accordance with the data shown in Table 3-1. In Closed Net Mode, the DMD20 allows the following N and K setting: (126, 112), (219, 201), (194, 178), (225, 205).
  • Page 43 DMD20 Universal Satellite Modem Theory of Operation Figure 3-16. Reed-Solomon Encoder Functional Block Diagram Figure 3-17. Reed-Solomon Decoder Functional Block Diagram Table 3-1. Reed-Solomon Codes for IDR Type of Data Rate R-S Code Bandwidth Interleaving Maximum Service (Kbps) (n, k, t)

  • Page 44: Dmd20 Automatic Uplink Power Control (Aupc Operation)

    DMD20 Universal Satellite Modem 3.15 DMD20 Automatic Uplink Power Control (AUPC Operation) The DMD20 Modem has an optional built-in provision for Automatic Uplink Power Control (AUPC). AUPC attempts to maintain a constant E at the receive end of an SCPC link. This is especially useful when operating over a satellite at Ku-Band Frequencies in locations with high rainfall periods.

  • Page 45: Asynchronous Overhead Operation (Framing/Multiplexer Capability)

    DMD20 Universal Satellite Modem Theory of Operation 3.16 Asynchronous Overhead Operation (Framing/Multiplexer Capability) The Asynchronous Framing/Multiplexer is capable of multiplexing a relatively low-speed overhead channel onto the terrestrial data stream resulting in a slightly higher combined or aggregate data rate through the modem. The overhead channel is recovered at the far end. This added channel is termed variously “An Overhead Channel”, ”Service Channel”, “Async Channel”...

  • Page 46: Standard Ibs Mode

    Theory of Operation DMD20 Universal Satellite Modem 19200 19200 1024 19200 1088 19200 1152 19200 1216 19200 1280 19200 1344 19200 1408 19200 1472 19200 1536 19200 1600 19200 1664 19200 1728 19200 1792 19200 1856 19200 1920 19200 1984...

  • Page 47: Asynchronous Multiplexer Mode

    Mode has been implemented that can be engaged under software control. Since this mode changes the use of many of the framed non-data bits, this mode is only usable when the DMD20 is at both ends of a link. In this mode, the overhead signaling bytes 16 and 48 can be used to implement a significantly higher speed ES to ES Data Channel under software control.
  • Page 48 Theory of Operation DMD20 Universal Satellite Modem 3-26 TM103 - Rev. 1.1...

  • Page 49: Section 4 - User Interfaces

    User Interfaces Section 4 – User Interfaces 4.0 User Interfaces There are two user interfaces available from the Front Panel of the DMD20. These are the Front Panel, and the Remote Port. 4.1 Front Panel User Interface The Front Panel of the DMD20 allows for complete control and monitor of all DMD20 parameters and functions via a keypad, LCD display and status LEDs.

  • Page 50: Lcd Front Panel Display

    User Interfaces DMD20 Universal Satellite Modem 4.1.1 LCD Front Panel Display The front panel display is a 2 line by 16-character LCD display. The display is lighted and the brightness can be set to increase when the front panel is currently in use. The LCD display automatically dims after a period of inactivity.

  • Page 51: Front Panel Led Indicators

    User Interfaces 4.1.4 Front Panel LED Indicators Eight LEDs on the DMD20 Front Panel (Refer to Table 4-3) indicate the status of the DMD20’s operation. The LED colors maintain a consistent meaning. Green signifies that the indication is appropriate for normal operation, Yellow means that there is a condition not proper for normal operation, and Red indicates a fault condition that will result in lost communications.

  • Page 52: Front Panel Control Screen Menus

    User Interfaces DMD20 Universal Satellite Modem 4.3 Front Panel Control Screen Menus The DMD20 Front Panel Control Screens are broken down into sections under several Main Menus. 4.3.1 Main Menus MODULATOR DEMODULATOR INTERFACE MONITOR ALARMS SYSTEM TEST 4.3.2 Modulator Menu Options and Parameters NETWORK SPEC {IDR, IBS, DROP &...
  • Page 53 Allows the user to enter the Transmitter Power Level. CARRIER {ON, OFF} The DMD20 transmitter will turn off the carrier output automatically when the modem determines there is a major alarm. This is done to prevent the carrier from outputting an unknown spectrum and possibly disturbing adjacent carriers.
  • Page 54 User Interfaces DMD20 Universal Satellite Modem SPECTRUM {NORMAL, INVERTED} Allows the user to invert the direction of rotation for PSK Modulation. Normal meets the IESS Specification. MODULATION {QPSK, BPSK, OQPSK, 8PSK, 16QAM} Allows the user to select the modulation type.

  • Page 55: Demodulator Menu Options And Parameters

    DMD20 Universal Satellite Modem User Interfaces REED-SOLOMON (menu) These selections are visible only when the Reed- Solomon Option is installed. RS ENABLE/DISABLE {ENABLED, DISABLED} Allows the user to Enable/Disable the Reed-Solomon Encoder. RS RATE {Refer to Table 3-1 for valid n/k values} Displays the currently used n, k Reed-Solomon Codes.
  • Page 56 User Interfaces DMD20 Universal Satellite Modem Drop & Insert: Data Rates: n x 64, n = 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30 Framing Type: 1/15 (IBS) Descrambler Type: IESS-309 Spectrum Mask: Intelsat...
  • Page 57 DMD20 Universal Satellite Modem User Interfaces DATA (menu) DATA RATE (bps) {Refer to Technical Specs for Data Rates} Allows the user to set the Data Rate in bps steps via the Front Panel Arrows or Keypad. SYMB RATE Allows the user to view the Symbol Rate.

  • Page 58: Interface Menu Options And Parameters

    User Interfaces DMD20 Universal Satellite Modem REED-SOLOMON (menu) These selections are visible only when the Reed- Solomon Option is installed. RS ENABLE/DISABLE {ENABLED, DISABLED} Allows the user to Enable/Disable the Reed-Solomon Encoder. RS RATE {Refer to Table 3-1 for valid n/k values} Displays the currently used n, k Reed-Solomon Codes.
  • Page 59 DMD20 Universal Satellite Modem User Interfaces RX SETUP (menu) CIRCUIT ID Provides entry of Rx Circuit Identifier. Circuits can be given up to an 11 Character alphanumeric Identity such as DLINK1 TERR INTERFACE {RS422 SERIAL, M2P PARALLEL, DVB PARALLEL, G.703 E2, G.703 T2 BAL, G.703 T2 UNBAL, G.703 E1 BAL, G.703 E1 UNBAL, G.703 T1 AMI, G.703 T1...

  • Page 60: Aupc Menu Options And Parameters

    User Interfaces DMD20 Universal Satellite Modem TX ES ENHANCED (menu) TX ES ENHANCED {DISABLED, ENABLED} TX INTERFACE {RS-232, RS -485} ES BAUD RATE {150 - 19200} Allows the user to select the baud rate in Enhanced Async Mode. Available rates are listed in Table 3-3.
  • Page 61 DMD20 Universal Satellite Modem User Interfaces MINIMUM TX POWER {variable through power range} Allows the user to set the minimum Transmit Power. The minimum Transmit Power is the lowest power setting that will be used when the remote modem commands a decrease of the Transmit Power.

  • Page 62: Monitor Menu Options And Parameters

    User Interfaces DMD20 Universal Satellite Modem REMOTE AUPC (menu) The 'REMOTE AUPC CONFIGURATION' menu contains the remote configuration parameters for the AUPC Function. AUPC ENABLE {OFF, ON} Allows the user to enable or disable the AUPC Function of the remote modem. The remote AUPC Function is the response of the local modem to commands for an increase or decrease of the Transmit Power in 0.5 dB...

  • Page 63: Alarms Menu Options And Parameters

    DMD20 Universal Satellite Modem User Interfaces BIT ERRORS Displays the current error count from the Viterbi Decoder. FREQ OFFSET (Hz) Displays the received carrier frequency offset as measured by the modem. VOLTAGES (menu) +1.5V RX SUPPLY Displays the measured voltage of the 1.5 Volt Rx power bus located inside the modem.
  • Page 64 User Interfaces DMD20 Universal Satellite Modem SCT CLOCK PLL {Pass/Fail, Unmasked/Masked} Indicates that the Tx SCT Clock PLL is not locked. This alarm will flash on during certain modem parameter changes. A solid indication indicates a hardware or programming failure within the modem.
  • Page 65 DMD20 Universal Satellite Modem User Interfaces SIGNAL LOCK {Pass/Fail, Unmasked/Masked} Indicates that the demod is unable to lock to a signal. FRAME LOCK {Pass/Fail, Unmasked/Masked} Indicates that the Framing Unit is unable to find the expected framing pattern. MULTIFRAME LOCK...
  • Page 66 User Interfaces DMD20 Universal Satellite Modem T1/E1 SIGNALING {Pass/Fail, Unmasked/Masked} IFEC LOCK {Pass/Fail, Unmasked/Masked} Indicates that the Framing Unit is unable to find the expected framing pattern. OFEC LOCK {Pass/Fail, Unmasked/Masked} Indicates that the Reed-Solomon Decoder is not locked. INTERLEAVER...
  • Page 67 DMD20 Universal Satellite Modem User Interfaces EXT CLOCK ACT {Pass/Fail, Unmasked/Masked} Indicates that the External Clock is not active. EXT REF ACT {Pass/Fail, Unmasked/Masked} Indicates no activity on the External Reference. EXT REF LOCK {Pass/Fail, Unmasked/Masked} Indicates that the External Reference PLL is not locked.
  • Page 68 User Interfaces DMD20 Universal Satellite Modem RX MINOR (menu) BUFF UNDERFLOW BUFF NEAR EMPTY BUFF NEAR FULL BUFF OVERFLOW RX DATA ACTIVITY SAT AIS RX FRAME LOCK MULTIFRAME LOCK INSERT CRC T1/E1 SIGNALING IFEC LOCK OFEC LOCK INTERLEAVER RS UNCORR. WORD...

  • Page 69: System Menu Options And Parameters

    DMD20 Universal Satellite Modem User Interfaces EXT REF ACT EXT REF LOCK CLEAR LATCHED ((ENTER)) Allows the user to reset the latched alarms. BACKWARD ALARMS Backward alarms are alarms that are fed back to or received from the other end of the satellite link. In IBS Mode (including Drop &...
  • Page 70 User Interfaces DMD20 Universal Satellite Modem FRONT PANEL (menu) BKLT LEVEL {OFF, LOW, MED, HIGH} Allows the user to enter the backlight intensity level. BKLT TIMEOUT {00 - 99} Allows the user to enter the length of time (in seconds) of keyboard inactivity before the backlight shuts off.
  • Page 71 DMD20 Universal Satellite Modem User Interfaces IP ADDR MASK {XXX.XXX.XXX.XXX} The IP Address Mask of the local network. The mask is expressed in a hexadecimal format, and must be a valid TCP/IP Mask. This field should be set before changes are made to the Modem or Router Address.
  • Page 72 User Interfaces DMD20 Universal Satellite Modem When V3 is used, three contexts are supported: public, mib2, and dev. Context, Authentication and Privacy are a portion of each SNMPV3 message. The public context will only allow the user to see the sysoid of the unit.

  • Page 73: Test Menu Options And Parameters

    DMD20 Universal Satellite Modem User Interfaces HW/FW CONFIG (menu) FIRMWARE REV Displays the installed firmware revision. MAIN BOARD (menu) Note: Only the appropriate of the VCO adjustment screens listed below will be displayed. These are protected fields, to prohibit accidental changes. To edit the field, the user must depress all four of the direction arrow keys simultaneously.
  • Page 74 User Interfaces DMD20 Universal Satellite Modem LOOPBACK {IF, TERR TX/RX, BASEBAND TX/RX, NONE, TERR RX, BASEBAND RX, TERR TX, BASEBAND TX, IFEC TX} Terrestrial Loopback is performed at the Terrestrial Interface IF: IF loopback loops the IF output of the Modulator to the IF input of the Demodulator.

  • Page 75: Dmd20 Strap Codes

    The Strap Code is a quick set key that sets many of the modem parameters. For quick setup of the DMD20, Strap Codes are very helpful. When a Strap Code is entered, the modem is automatically configured for the code’s corresponding data rate, overhead, code rate, framing, scrambler type and modulation.
  • Page 76 User Interfaces DMD20 Universal Satellite Modem NONE V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE...
  • Page 77 DMD20 Universal Satellite Modem User Interfaces NONE 2368 V.35 DISABLE DISABLE QPSK (IESS) NONE 2368 V.35 DISABLE DISABLE QPSK (IESS) NONE V.35 DISABLE DISABLE QPSK (IESS) 1544 3072/ DISABLE DISABLE QPSK 2895 1920 16/15 DISABLE DISABLE QPSK NONE 6312 V.35...
  • Page 78 User Interfaces DMD20 Universal Satellite Modem 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 16/15 DISABLE DISABLE QPSK 1024 16/15 DISABLE DISABLE QPSK 1024...

  • Page 79: Sample Dmd20 Applications

    QPSK 4.5 Sample DMD20 Applications The following section provides brief application notes for operating the DMD20 and explains by example how to configure the DMD20 for some of the most popular configurations. The following information illustrates the allowable combinations for Mode and Data Rate for the DMD20.

  • Page 80: Operational Case Examples

    User Interfaces DMD20 Universal Satellite Modem 4.5.1 Operational Case Examples Note: For best results always begin setup by setting the data rate to 512 Kbps. This data rate is applicable for all modes and as such provides a convenient launch point for setting up the modem.
  • Page 81 DMD20 Universal Satellite Modem User Interfaces Case 2: IBS 1.544 Mbps, 3/4 Rate Viterbi Starting with the Data Rate – 512 Kbps Modulator: Method 1 - Set Framing to 1/15 Set mode to IBS Under Mod Data menu: Set code rate to 3/4 VIT...
  • Page 82 User Interfaces DMD20 Universal Satellite Modem Case 3: Closed Network, 3/4 Rate Viterbi, IBS Overhead Starting with the Data Rate = 512 Kbps Modulator: Method 1 - Set mode to IDR: Under Mod Data menu: Set code rate to 3/4 VIT...

  • Page 83: Configuring The Dmd20 For Drop And Insert

    Set SCT Source to SCR Set Tx Clock to SCTE 4.6 Configuring the DMD20 for Drop and Insert Several dependencies exist when configuring the modem for Drop and Insert (D&I). The following paragraphs explain these dependencies and provide the user with the information required to ensure smooth transition into D&I and to minimize the potential impact of these...

  • Page 84: Operational Network Specification

    User Interfaces DMD20 Universal Satellite Modem n = 1, data rate = 64000 n = 2, data rate = 128000 n = 3, data rate = 192000 n = 4, data rate = 256000 n = 5, data rate = 320000...

  • Page 85: Insert Terrestrial Frame Source

    DMD20 Universal Satellite Modem User Interfaces 4.6.3.1 Insert Terrestrial Frame Source The Insert Terrestrial Frame Source selection tells the Modem from where the Insert Terrestrial Frame is coming. External: Indicates that the terrestrial frame is to be input via the Insert Data In Port.
  • Page 86 User Interfaces DMD20 Universal Satellite Modem Under Modulator: Under Mod IF: Set Frequency to desired value Turn IF Output Power On Under Demodulator: Under Demod Data: Set Data Rate = 512000 Set Conv Enc = 3/4 Rate VIT Under Demodulator: Set Network Spec.
  • Page 87 DMD20 Universal Satellite Modem User Interfaces For Satellite Channels that are not to be inserted, enter “NI” (No Insert) for the Terrestrial Slot Use Map Copy to copy Rx Edit to Rx Active Under Demodulator: Under Demod IF: Set Frequency to desired value.
  • Page 88 User Interfaces DMD20 Universal Satellite Modem Figure 4-5. Rx Only With Trunk Figure 4-6. Rx Only No Trunk 4-40 TM103 - Rev. 1.1...

  • Page 89: D&I Maps And Map Editing

    Maps always contain 30 entries, although, only the first “n” entries are relevant (see Table 4-5). The DMD20 includes provisions to copy, change, and store the D&I transmit and receive maps directly from the Front Panel or via the remote M&C link. These maps are tables that are used to define and configure the D&I functions.
  • Page 90 User Interfaces DMD20 Universal Satellite Modem Table 4-6. D&I ROM Maps T1/E1 Time Slot 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30...
  • Page 91 DMD20 Universal Satellite Modem User Interfaces For example, ROM Map 1 could be used as the template for as Active Transmit (Drop) Map for a modulator configured for 64 Kbps operation. Only the first time slot of the T1 or E1 frame would be dropped into the modulator transmit path.

  • Page 92: Terminal Mode Control

    16 and 17 through 31. 4.8 Terminal Mode Control The DMD20 Terminal Mode Control allows the use of an external terminal or computer to monitor and control the modem from a full screen interactive presentation operated by the modem itself.

  • Page 93: Modem Remote Communications

    4.9.1 Host Computer Remote Communications Note: This specification is applicable to the DMD20, DMD15, DMD15L, DMD10 and DMD10L Modems. Any reference to the DMD20 in this document can be applicable to any one of these three modems. Control and status messages are conveyed between the DMD20 and the subsidiary modems and the host computer using packetized message blocks in accordance with a proprietary communications specification.

  • Page 94: Protocol Wrapper

    M&C computer. 4.9.1.2 Protocol Wrapper The Radyne COMMSPEC is byte-oriented, with the Least Significant Bit (LSB) issued first. Each data byte is conveyed as mark/space information with two marks comprising the stop data. When the last byte of data is transmitted, a hold comprises one steady mark (the last stop bit).
  • Page 95 DATA accordingly to perform a specific function or series of functions. Acknowledgment and error codes are returned in this field. 1 Byte for the DMD20 protocol, and 2 Bytes for the DMD20 protocol. <DATA >: The Data field contains the binary, bi-directional data bytes associated with the <OPCODE>.

  • Page 96: Frame Description And Bus Handshaking

    M&C computer or by a subordinate piece of equipment (such as the DMD20) requesting access to the bus. Data is processed in accordance with the OPCODE, and the checksum for the frame is calculated. If the anticipated checksum does not match, then a checksum error response is returned to the message frame originator.

  • Page 97: Global Response Operational Codes

    Global response opcodes are common responses, issued to the M&C computer or to another device, that can originate from and are interpreted by all Radyne equipment in the same manner. These are summarized as follows (all opcode values are expressed in decimal form): Table 4-8.
  • Page 98 User Interfaces DMD20 Universal Satellite Modem MPARM_CARRIERSELECTION_ERROR 0x0412 MPARM_SPECTRUM_ERROR 0x0413 MPARM_OPERATINGMODE_ERROR 0x0414 MPARM_TERRLOOPBACK_ERROR 0x0415 MPARM_BASELOOPBACK_ERROR 0x0416 MPARM_CLOCKCONTROL_ERROR 0x0417 MPARM_CLOCKPOLARITY_ERROR 0x0418 MPARM_FRAMING_ERROR 0x0419 MPARM_DROPMODE_ERROR 0x041A MPARM_SCTSOURCE_ERROR 0x041B MPARM_DROPT1SIGNALING_ERROR 0x041C MPARM_DROPMAP_ERROR 0x041D MPARM_T1D4YELLOW_ERROR 0x041E MPARM_FORCEDALARMS_ERROR 0x041F MPARM_ALARMMASKENABLE_ERROR 0x0420 MPARM_ALARMMASK_ERROR 0x0421 MPARM_MODE_ERROR 0x0422...
  • Page 99 DMD20 Universal Satellite Modem User Interfaces MPARM_AUPCREMOTECLACTION_ERROR 0x0438 MPARM_AUPCTRACKINGRATE_ERROR 0x0439 MPARM_AUPCREMOTEBBLOOPACK_ERROR 0x043A MPARM_AUPCREMOTE2047_ERROR 0x043B MPARM_AUPCEBNO_ERROR 0x043C MPARM_AUPCMINPOWER_ERROR 0x043D MPARM_AUPCMAXPOWER_ERROR 0x043E MPARM_AUPCNOMINAPOWER_ERROR 0x043F MPARM_TIME_MARK_ERROR 0x0444 DPARM_MODE_ERROR 0x0600 DPARM _FREQUENCY_ERROR 0x0601 DPARM_SWEEPDELAY_ERROR 0x0602 DPARM_DATARATE_ERROR 0x0603 DPARM_SWEEPBOUNDARY_ERROR 0x0604 DPARM_LEVELLIMIT_ERROR 0x0605 DPARM_STRAP_ERROR 0x0606 DPARM_FILTERMASK_ERROR...

  • Page 100: Collision Avoidance

    User Interfaces DMD20 Universal Satellite Modem DPARM_AUTOALARM_ERROR 0x0618 DPARM_BEREXPONENT_ERROR 0x0619 DPARM_CIRCUITID_ERROR 0x061A DPARM_TERRLOOPBACK_ERROR 0x061B DPARM_BASELOOPBACK_ERROR 0x061C DPARM_IFLOOPBACK_ERROR 0x061D DPARM_INTERFACETYPE_ERROR 0x061E DPARM_INTERFACENOTPRESENT_ERROR 0x061F DPARM_INTERFACECOMMUNICATION_ERROR 0x0620 DPARM_SYMBOLRATE_ERROR 0x0621 DPARM_NOTIMPLEMENTED_ERROR 0x0622 DPARM_DATAINVERT_ERROR 0x0623 DPARM_SUMMARYFAULT_ERROR 0x0624 DPARM_EXTERNALEXCSOURCE_ERROR 0x0625 DPARM_CLEARLATCHEDALARM1_ERROR 0x0626 DPARM_CLEARLATCHEDALARM2_ERROR 0x0627 DPARM_CLEARLATCHEDALARM3_ERROR 0x0628...
  • Page 101 DMD20 Universal Satellite Modem User Interfaces For example, if two DMD20 Modems with different addresses (DESTINATION IDs) are linked to the same control bus at the same hierarchical level, both will attempt to respond to the M&C computer when the computer generates a multi-drop override ID of 22. If their actual setup...

  • Page 102: Software Compatibility

    Therefore, if a DMD20 Modulator is queried for its equipment type identifier, it will return a "20" and DMD20 Demodulator will return a "21". A DMD20 Modem will also return a "22".

  • Page 103: Rllp Summary

    COUNT DEST DATA CHECKSUM ADDR ADDR CODE BYTES 4.9.2 Remote Port Packet Structure The Modem protocol is an enhancement on the DMD20 protocol. It also uses a packet structure format. The structure is as follows: TM103 – Rev. 1.1 4-55...
  • Page 104 200 characters(≈ 200 msec). If this timeout value is exceeded, the equipment will timeout. 4.9.3 DMD20 Opcode Command Set Refer to Appendix B for Modem Remote Communications. 4-56...

  • Page 105: Section 5 - Rear Panel Interfaces

    5.0 DMD20 Connections All DMD20 connections are made to labeled connectors located on the rear of the unit (refer to Figure 5-1). The connector definitions below are those on the DMD20 unit. Any connection interfacing to the DMD20 must be the appropriate mating connector.

  • Page 106: Audio (J2)

    Rear Panel Interfaces DMD20 Universal Satellite Modem Backward Alarm Out - 4 NO ESCBWO 4NO No Connection Backward Alarm In - 2 ESCBWI 2 Input Backward Alarm In - 4 ESCBWI 4 Input No Connection No Connection Backward Alarm Out - 1 C...
  • Page 107 DMD20 Universal Satellite Modem Rear Panel Interfaces TM103 – Rev. 1.1...

  • Page 108: Data (J3)

    Rear Panel Interfaces DMD20 Universal Satellite Modem 5.4 8K DATA (J3) The 8K Data Port allows for communications between Earth Stations. It is a 15-Pin Female “D” Connector. Refer to Table 5-3 for pinouts. Table 5-3. 8K DATA Port 15-Pin Female “D” Connector (J3) Pin No.

  • Page 109: Switch Interface (J5)

    DMD20 Universal Satellite Modem Rear Panel Interfaces Send Data (+) SD-B Input No Connect Receive Data B (+) RD-B Output Drop Data Out (-) DDO-A Output Insert Data In (-) EXC (-) IDI-A Input MOD-FLT DMD-FLT 5.6 SWITCH INTERFACE (J5) The Switch Interface Port is a 68-Pin High-Density Female Connector.
  • Page 110 Rear Panel Interfaces DMD20 Universal Satellite Modem IDR ESC Audio Input Channel 1A ESCAUDTX 1A Input IDR ESC Audio Input Channel 2A ESCAUDTX 2A Input IDR ESC Audio Output Channel 1A ESCAUD RX 1A Output IDR ESC Audio Output Channel 2A...
  • Page 111 DMD20 Universal Satellite Modem Rear Panel Interfaces IDR ESC Backward Alarm ESCBWO 2C Out - 2 Common Synchronous Data Terminal SYNC TT-B Timing – B IDR ESC Backward Alarm ESCBWO 2NO Output - 2 Normally Open G.703 Drop Data Out - B...

  • Page 112: Sd (Ddi) (J6)

    Rear Panel Interfaces DMD20 Universal Satellite Modem IDR ESC Backward Alarm ESCBWO 4NO Out - 4 Normally Open IBS Transmit Octet Input - B TXO -B Input Synchronous Data – Data Mode SYNC DM-B Output Out - B Synchronous Data - Clear to...

  • Page 113: Rx If (J13)

    DMD20 Universal Satellite Modem Rear Panel Interfaces 5.14 RX IF (J13) The Receive IF Input Port is a 75O Female BNC Connector that is used for 70/140 MHz IF. If the customer orders the 70/140 MHz IF, the Transmit IF Output Port is a 75O Female BNC Connector.

  • Page 114: Async (J17)

    Rear Panel Interfaces DMD20 Universal Satellite Modem 5.18 ASYNC (J17) The Asynchronous Data Interface Port is a 9-Pin Female “D” Connector. Refer to Table 5-7 for pinouts. Table 5-7. ASYNC Port 9-Pin Female “D” Connector (J17) Pin No. Signal Name...

  • Page 115: J19)

    DMD20 Universal Satellite Modem Rear Panel Interfaces 5.20 EIA-530 (J19) The EIA -530 Port is an RS -422/V.35/RS -232 Connection. It is a 25-Pin Female “D” Connector. Refer to Table 5-9 for pinouts. Table 5-9. EIA-530 Port (RS-422/V.35/RS-232) 25-Pin Female “D” Connector (J19) Pin No.

  • Page 116: Remote (J20)

    Rear Panel Interfaces DMD20 Universal Satellite Modem 5.21 REMOTE (J20) The Remote Port is a RS-485 or RS-232 Connection for remote monitor and control of the modem. It is a 9-Pin Female “D” Connector. Refer to Table 5-10 for pinouts.
  • Page 117 DMD20 Universal Satellite Modem Rear Panel Interfaces TM103 – Rev. 1.1 5-13...

  • Page 118: Section 6 - Maintenance And Troubleshooting

    6.0 Periodic Maintenance There is no external fuse on the DMD20. The fuse is located on the power supply assembly inside the case, and replacement is not intended in the field. 6.0.1 Clock Adjustment The DMD20 allows for internal VCO speed adjustment from the front panel.

  • Page 119: Alarm Faults

    Maintenance and Troubleshooting DMD20 Universal Satellite Modem The Receive Carrier Frequency is Check that the Receive outside of the acquisition range. Acquisition Range is adequate for the possible system offsets (setting the value to 30 kHz is a standard value encompassing all normal offsets).

  • Page 120: Major Rx Alarms

    DMD20 Universal Satellite Modem Maintenance and Troubleshooting quality. This alarm will flash on during certain modem parameter changes. A solid indication indicates a problem with the incoming clock to the modem (SCTE). TxSynth (Tx The Tx IF Synthesizer is not...

  • Page 121: Minor Tx Alarms

    Maintenance and Troubleshooting DMD20 Universal Satellite Modem 6.1.1.3 Minor Tx Alarms Alarm Possible Cause Action TerrClk (Terrestrial No Terrestrial Clock activity. Call the Radyne ComStream Clock) Customer Service Center. IntClk (Internal Clock) No SCT Clock activity. Call the Radyne ComStream Customer Service Center.

  • Page 122: Drop And Insert Alarms

    DMD20 Universal Satellite Modem Maintenance and Troubleshooting The Doppler Buffer is about to Call the Radyne ComStream Buf <10% underflow. Could be caused by Customer Service Center. poor clocking or satellite fade. Call the Radyne ComStream Buf >90% The Doppler Buffer is about to Customer Service Center.

  • Page 123: Common Major Alarms

    There is an M&C Memory fault. The Modem may need to be replaced. 6.1.2 Alarm Masks The DMD20 performs a high degree of self-monitoring and fault isolation. The alarms for these faults are separated into the following three categories: Active Alarms Common Equipment Alarms Backward Alarms A feature exists that allows the user to ‘Mask’...

  • Page 124: Active Alarms

    In IBS Mode (including Drop & Insert), Backward Alarm 1 is the only one used. It would be received if the distant end demod drops lock. 6.2 DMD20 Fault Tree Matrices 6.2.1 Interpreting the Matrices The first vertical column in the Tables represents the various Faults that the modem may identify.
  • Page 125 Maintenance and Troubleshooting DMD20 Universal Satellite Modem Figure 6-10. IBS Alarm Concept Table 6-4. IBS Fault Conditions and Actions (includes Drop and Insert) Fault Detected on Action In Earth Action to Terrestrial Action to Satellite Terrestrial Link Station (Across Interface H)
  • Page 126 DMD20 Universal Satellite Modem Maintenance and Troubleshooting Fault Detected From Satellite (Across Interface E) FA1 - Loss of Satellite AS1,2 - IBS Prompt, AH1, 3 - AIS in TSs, AD2 - ‘1’ in Bit 3 of Signal Input Service Alarm ‘1111’...
  • Page 127 Maintenance and Troubleshooting DMD20 Universal Satellite Modem 6-10 TM103 - Rev. 1.1...

  • Page 128: Section 7 - Technical Specifications

    DMD20 Universal Satellite Modem Technical Specifications Section 7 – Technical Specifications 7.0 Data Rates BPSK Uncoded 4.8 kbps to 10.0 Mbps 1/2 Rate BPSK 2.4 kbps to 5.0 Mbps 3/4 Rate BPSK 3.6 kbps to 7.5 Mbps 7/8 Rate BPSK 4.2 kbps to 8.75 Mbps...

  • Page 129: Plesiochronous Buffer

    < 1 x 10 7.5 Monitor and Control Remote RS485/Terminal RS232/Ethernet 10baseT DMD15/DMD2401 Protocol Compatible 7.6 DMD20 Drop and Insert (Optional) Terrestrial Data 1.544 Mbps or 2.048 Mbps, G.732/733 Line Coding AMI or B8ZS for T1 and HDB3 for E1...

  • Page 130: Terrestrial Interfaces

    DMD20 Universal Satellite Modem Technical Specifications 7.7 Terrestrial Interfaces A variety of standard interfaces are available for the DMD20 modem in stand-alone applications. 7.8 IDR/ESC Interface (Optional) G.703 T1 (DSX1) 1.544 Mbps, 100O balanced, AMI and B8ZS G.703 E1 2.048 Mbps, 75O unbalanced and 120O balanced, HDB3 G.703 T2 (DSX2)
  • Page 131 Technical Specifications DMD20 Universal Satellite Modem QPSK QPSK 8400 17500000 QPSK 4752 9900000 QPSK 7612.8 15860000 BPSK OQPSK NONE 9600 20000000 OQPSK 4800 10000000 OQPSK OQPSK 7200 15000000 OQPSK OQPSK 8400 17500000 OQPSK 4752 9900000 OQPSK 7612.8 15860000 8PSK NONE...

  • Page 132: Dmd20 Ber Specifications

    DMD20 Universal Satellite Modem Technical Specifications 7.13 DMD20 BER Specifications 7.13.1 Modem BER Performance (Viterbi) Specification Typical 1/2 Rate 3/4 Rate 7/8 Rate 1/2 Rate 3/4 Rate 3/4 Rate 7/8 Rate 4.1 dB 5.2 dB 6.2 dB 3.25 dB 4.2 dB 4.35 dB...

  • Page 133: Sequential Decoder Ber Performance (1.544 Mbps)

    Technical Specifications DMD20 Universal Satellite Modem 7.13.4 Sequential Decoder BER Performance (1.544 Mbps) Specification Typical 1/2 Rate 3/4 Rate 7/8 Rate 1/2 Rate 3/4 Rate 7/8 Rate 4.8 dB 5.2 dB 6.0 dB 4.3 dB 4.7 dB 5.5 dB 5.2 dB 5.7 dB...

  • Page 134: Qam Ber Performance (Viterbi Decoder W/ Reed-Solomon)

    DMD20 Universal Satellite Modem Technical Specifications 7.13.7 16 QAM BER Performance (Viterbi Decoder w/ Reed-Solomon) Specification Typical 8.4 dB 9.8 dB 7.8 dB 9.3 dB 8.6 dB 10.1 dB 8.1 dB 9.6 dB 8.9 dB 10.3 dB 8.3 dB 9.9 dB 9.1 dB...
  • Page 135 Technical Specifications DMD20 Universal Satellite Modem Figure 7-2. Concatenated Reed-Solomon Figure 7-3. 8PSK With and Without Reed Solomon Codec TM103 - Rev. 1.1...
  • Page 136 DMD20 Universal Satellite Modem Technical Specifications Figure 7-4. 56 Kbps Sequential Figure 7-5. 1.544 Mbps Sequential TM103 – Rev. 1.1...
  • Page 137 Technical Specifications DMD20 Universal Satellite Modem 7-10 TM103 - Rev. 1.1...

  • Page 138: Appendix A - Product Options

    The DMD20 can be equipped with a G.703/IDR ESC Interface. A.0.2 Turbo Card The DMD20 can be equipped with an optional Turbo Codec Outer Code. This option must be installed at the factory and may require other options. A.0.3 Internal High Stability...
  • Page 139 Appendix A DMD20 Universal Satellite Modem TM103 - Rev. 1.1...

  • Page 140: Appendix B - Remote Operations

    DMD20 Universal Satellite Modem Appendix B Appendix B – Remote Operations When new features are added to Radyne ComStream Corporation equipment, the control parameters are appended to the end of the Non- Volatile Section of the Remote Communications Specification, and status of the features, if any, are added at the end of the Volatile Section.
  • Page 141 Appendix B DMD20 Universal Satellite Modem Query Demodulator Status 240Ch Query Modem Eb/No, BER and Level 240Dh Query Time 240Eh Query Date 240Fh Query Time and Date 2410h Query Modem Summary Faults 2411h Command Opcode Command Modem Control Mode 2600h...
  • Page 142 DMD20 Universal Satellite Modem Appendix B Command Modulator External EXC Clock 261Ah Command Modulator External Reference 261Bh Frequency Command Modulator T1 D4 Yellow Alarm 261Dh Selection Command Modulator Interface Type 261Eh Command Modulator Circuit ID 261Fh Command Force Modulator Summary Alarms...
  • Page 143 Appendix B DMD20 Universal Satellite Modem Command Demodulator Descrambler Type 2A0Eh Command Demodulator Spectrum 2A0Fh Command Demodulator Buffer Size 2A10h Command Demodulator Buffer Clock 2A11h Command Demodulator Buffer Clock Polarity 2A12h Command Demodulator Insert Mode 2A13h Command Demodulator T1 E1 Frame Source...

  • Page 144: Detailed Command Descriptions

    DMD20 Universal Satellite Modem Appendix B B.0.2 Detailed Command Descriptions B.0.2.1 DMD20 Modulator Opcode: <2400h> Query a modulator's configuration and status Query Response <1> Number of nonvol bytes <1> Network Spec 0 = Closed Net. 1 = IDR, 2 = IBS, 3 = D&I <4>...
  • Page 145 Appendix B DMD20 Universal Satellite Modem <1> Scrambler Control 0 = Disable, 1 = Enable <1> Scrambler Type 0 = None 1 = IBS Scrm 2 = V35_IESS 3 = V35_CCITT 4 = V35_EFDATA 5 = V35_FAIRCHILD 6 = OM-73...
  • Page 146 DMD20 Universal Satellite Modem Appendix B <1> Forced Alarms (0 = None, or else a 1 in the following bits means force) Bit 0 = Backward Alarm 1 IDR and IBS Bit 1 = Backward Alarm 2 IDR only Bit 2 = Backward Alarm 3 IDR only...
  • Page 147 Appendix B DMD20 Universal Satellite Modem <1> Tx RS Depth 4 or 8 <1> Data Invert 0 = None, 1 = Terrestrial, 2 = Baseband, 3 = Terrestrial and Baseband <1> BPSK Symbol Pairing 0 = Normal Pairing, 1 = Swapped Pairing <1>...
  • Page 148 DMD20 Universal Satellite Modem Appendix B <2> AUPC Target Eb/No Target Eb/No at Receiver <2> AUPC Minimum Singed value +50 to –200 with implied decimal point; 49 = Power +4.9 dBm <2> AUPC Maximum Singed value +50 to –200 with implied decimal point; 49 = Power +4.9 dBm...
  • Page 149 Appendix B DMD20 Universal Satellite Modem <1> Alarm 3 Bit 0 = Backward Alarm 1 Transmitted Bit 1 = Backward Alarm 2 Transmitted Bit 2 = Backward Alarm 3 Transmitted Bit 3 = Backward Alarm 4 Transmitted Bits 4 - 7 = Spare 0 = No, 1 = Yes <2>...
  • Page 150 DMD20 Universal Satellite Modem Appendix B <1> +12V Voltage +12V. Implied decimal point. ex: 121 = +12.1 V <1> -12V Voltage -12V. Implied decimal point and minus sign. ex: 118 = -11.8 V <2> Temperature Degrees C. Implied decimal point. ex: 490 = 49.0 C <1>...
  • Page 151 Appendix B DMD20 Universal Satellite Modem Opcode: <2601h> Command a modulator's configuration <1> Network Spec. 0 = Closed Net. 1 = IDR, 2 = IBS, 3 = D&I <4> Frequency Selects the IF Frequency in Hz. The range is 50 MHz to 180...
  • Page 152 DMD20 Universal Satellite Modem Appendix B <1> Scrambler Type 0 = None 1 = IBS Scrm. 2 = V35_IESS 3 = V35_CCITT 4 = V35_EFDATA 5 = V35_FAIRCHILD 6 = V35_OM-73 7 = R-S Scrambler 8 = V35 EF Scrambler 9 = TPC Scrambler <2>...
  • Page 153 Appendix B DMD20 Universal Satellite Modem <1> Forced Alarms 0 = None, or else a 1 in the following bits means force Bit 0 = Backward Alarm 1 IDR and IBS Bit 1 = Backward Alarm 2 IDR only Bit 2 = Backward Alarm 3 IDR only...
  • Page 154 DMD20 Universal Satellite Modem Appendix B <1> Tx ReedSolomon 4 or 8 <1> Data Invert 0 = None, 1 = Terrestrial, 2 = Baseband, 3 = Terrestrial and Baseband <1> BPSK Symbol Pairing 0 = Normal Pairing, 1 = Swapped Pairing <1>...
  • Page 155 Appendix B DMD20 Universal Satellite Modem <2> AUPC Target Eb/No Target Eb/No at Receiver <2> AUPC Minimum Singed value +50 to –200 with implied decimal point; 49 = Power +4.9 dBm <2> AUPC Maximum Singed value +50 to –200 with implied decimal point; 49 = Power +4.9 dBm...
  • Page 156 DMD20 Universal Satellite Modem Appendix B Opcode: <2607h> Command a modulator's convolutional encoder <1> Convolutional 0 = None Encoder 1 = Viterbi 1/2 Rat e 2 = Viterbi 2/3 Rate 3 = Viterbi 3/4 Rate 4 = Viterbi 5/6 Rate...
  • Page 157 Appendix B DMD20 Universal Satellite Modem Opcode: <260Eh> Command a modulator's drop mode <1> Drop Mode 0 = Disabled 1 = T1 -D4 2 = T1-ESF 3 = PCM-30 4 = PCM-30C 5 = PCM-31 6 = PCM-31C 7 = SLC-96...
  • Page 158 DMD20 Universal Satellite Modem Appendix B Opcode: <2618h> Command a modulator's baseband loopback <1> Baseband Loopback 0 = Disable, 1 = Enable Opcode: <2619h> Command a modulator's mode <1> Mode 0 = Closed Net. 1 = IDR, 2 = IBS, 3 = D&I Opcode: <261Ah>...
  • Page 159 Appendix B DMD20 Universal Satellite Modem Opcode: <262Ch> Command AUPC Remote CL Action <1> AUPC Remote CL 0 = Hold, 1 = Nominal, 2 = Maximum Action Opcode: <262Dh> Command AUPC Tracking Rate <1> AUPC Tracking Rate 0 = 0.5 dB/min.
  • Page 160 DMD20 Universal Satellite Modem Appendix B Opcode: <2634h> Command AUPC Local Configuration <1> AUPC Local Enable 0 = Off, 1 = On <1> AUPC Local CL 0 = Hold, 1 = Nominal, 2 = Maximum Action <1> AUPC Tracking Rate 0 = 0.5 dB/min.

  • Page 161: Dmd20 Demodulator

    Appendix B DMD20 Universal Satellite Modem B.0.2.2 DMD20 Demodulator Opcode: <2401h> Query a demodulator's configuration and status Query Response <1> Number of nonvol bytes <1> Network Spec. 0 = Closed Net. 1 = IDR, 2 = IBS, 3 = D&I <4>...
  • Page 162 DMD20 Universal Satellite Modem Appendix B <1> Descrambler Control 0 = Disable, 1 = Enable <1> Descrambler Type 0 = None 1 = IBS Scrm. 2 = V35_IESS 3 = V35_CCITT 4 = V35_EFDATA 5 = V35_FAIRCHILD 6 = V35_OM-73 7 = R-S Descrambler 8 = V.35 EFRS Descrambler...
  • Page 163 Appendix B DMD20 Universal Satellite Modem 15 = BK1,2,3&4 <1> Forced Alarms 0 = None, 1 = Send the Alarm Bit 0 = Rx Summary Alarm Bits 1 - 4 = Spares <1> Alarm1 Mask <1> Alarm2 Mask <1> Alarm3 Mask <1>...
  • Page 164 DMD20 Universal Satellite Modem Appendix B <1> Insert Status Mask Bit 0 = Frame lock Bit 1 = Multiframe lock. Valid in E1 PCM-30 and PCM -30C Bit 2 = CRC lock. Valid in T1ESF, and E1 CRC enabled Bit 3 = T1 yellow alarm received Bit 4 = E1 FAS alarm received Bit 5 = E1 MFAS alarm received.
  • Page 165 Appendix B DMD20 Universal Satellite Modem <1> Common Alarm2 <1> Latched Alarm1 <1> Latched Alarm2 <1> Latched Alarm3 <1> Latched Common Alarm1 <1> Latched Common Alarm2 <1> Backward Bit 0 = Backward Alarm 1 IDR and IBS Bit 1 = Backward Alarm 2 IDR only...
  • Page 166 Bit 6 = E1 CRC alarm received. 1 = Received Bit 7 = CRC calculation error. 1 = Fail <1> Online Flag 0 = Offline, 1 = Online <1> Loss Flag 1 = Loss of Signal, DMD20 <1> Alarm5 <1> Reserved Ignore <4>...
  • Page 167 Appendix B DMD20 Universal Satellite Modem <1> Latched Alarm1 <1> Latched Alarm2 <1> Latched Alarm3 <1> Latched Common Alarm1 <1> Latched Common Alarm2 <1> Backward Bit 0 = Backward Alarm 1 IDR and IBS Bit 1 = Backward Alarm 2 IDR only...
  • Page 168 Bit 6 = E1 CRC alarm received. 1 = Received Bit 7 = CRC calculation error. 1 = Fail <1> Online Flag 0 = Offline, 1 = Online <1> Loss Flag 1 = Loss of Signal, DMD20 <1> Alarm5 <1> Reserved Ignore <4>...
  • Page 169 Appendix B DMD20 Universal Satellite Modem Opcode: <2409h> Query a demodulator's Current Alarms Query Response <1> Alarm1 <1> Alarm2 <1> Alarm3 <1> Alarm4 <1> Insert Status Fault <1> Common Alarm1 <1> Common Alarm2 Opcode: <2A00h> Command a demodulator's configuration <1>...
  • Page 170 DMD20 Universal Satellite Modem Appendix B <1> Convolutional 0 = None Decoder 1 = Viterbi 1/2 Rate 2 = Viterbi 2/3 Rate 3 = Viterbi 3/4 Rate 4 = Viterbi 5/6 Rate 5 = Viterbi 7/8 Rate 6 = Viterbi 8/9 Rate...
  • Page 171 Appendix B DMD20 Universal Satellite Modem <1> Insert Mode 0 = Disabled 1 = T1 -D4 2 = T1 -ESF 3 = PCM-30 4 = PCM-30C 5 = PCM-31 6 = PCM-31C 7 = SLC-96 8 = T1 D4 S 9 = T1 ESF S <1>...
  • Page 172 DMD20 Universal Satellite Modem Appendix B <1> ESC Channel 2 Binary value, steps TBD, [valid in IDR only] +10 dBm to –20 Volume <1> BER Exponent 6 through 9 <11> Rx Circuit ID 11 ASCII characters <1> Rx Terrestrial 0 = Disabled, 1 = Enabled Loopback <1>...
  • Page 173 Appendix B DMD20 Universal Satellite Modem <1> ES Mode 0 = Normal, 1 = Enhanced <1> ES Type 0 = RS-232, 1 = RS-485 <1> ES Baud 0 = 150. 1 = 300, 2 = 600, 3 = 1200, 4 = 2400, 5 = 4800, 6 = 9600 <1>...
  • Page 174 DMD20 Universal Satellite Modem Appendix B Opcode: <2A09h> Command a demodulator's differential decoder <1> Differential Decoder 0 = Off, 1 = On Opcode: <2A0Ah> Command a demodulator's ReedSolomon <1> ReedSolomon 0 = Disable, 1 = Enable Opcode: <2A0Bh> Command a demodulator's mode <1>...
  • Page 175 Appendix B DMD20 Universal Satellite Modem Opcode: <2A15h> Command a demodulator's T1E1 frame source <1> T1E1 Frame Source 0 = Internal, 1 = External Opcode: <2A16h> Command a demodulator's framing <1> Framing 0 = No framing, 1 = 96K, 2 = 1/15, 3 = EF AUPC 1/15 Opcode: <2A17h>...
  • Page 176 B.0.5.3 Modem Queries & Commands Opcode: <2403h> Query a modem's identification Query Response <1> Modem ID DMD20 Modulator = 20, DMD20 Demodulator = 21, DMD20 Modem = 22 Opcode: <2404h> Query a modem's control mode Query Response <1> Modem control mode 0 = Front panel.
  • Page 177 Appendix B DMD20 Universal Satellite Modem Opcode: <2407h> Query a modem's Latched Alarms Query Response <1> Mod Latched Alarm1 <1> Demod Latched Alarm1 <1> Demod Latched Alarm2 <1> Demod Latched Alarm3 <1> Latched Common Alarm1 <1> Latched Common Alarm2 Opcode: <240Ah>...
  • Page 178 DMD20 Universal Satellite Modem Appendix B <1> Insert Status Fault Bit 0 = Frame lock fault. 1 = Fail Bit 1 = Multiframe lock fault. Valid in E1 PCM-30 and PCM - 30C. 1 = Fail Bit 2 = CRC lock fault. Valid in T1ESF, and E1 CRC enabled.
  • Page 179 Appendix B DMD20 Universal Satellite Modem Opcode: <240Fh> Query date <1> Year 0 - 99 <1> Month 0 - 11 <1> 0 - 30 Opcode: <2410h> Query time and date <1> Hour 0 - 23 <1> Minute 0 - 59 <1>...
  • Page 180 DMD20 Universal Satellite Modem Appendix B Opcode: <2C01h> Command drop and insert map <1> Map to Change 0 = Drop active map 1 = Insert active map 2 = Drop edit map 3 = Insert edit map 4 - 11 = User map #1 through #8 <30>...
  • Page 181 Appendix B DMD20 Universal Satellite Modem B-42 TM105 – Rev. 1.1...

  • Page 182: Appendix C - Snmp Mib

    DMD20 Universal Satellite Modem Appendix C Appendix C – SNMP MIB TM105 – Rev. 1.1...
  • Page 183 Appendix C DMD20 Universal Satellite Modem TM105 – Rev. 1.1...
  • Page 184 DMD20 Universal Satellite Modem Glossary Glossary Ampere Alternating Current Analog to Digital Converter Automatic Gain Control Alarm Indication System. A signal comprised of all binary 1s. ANSI American National Standards Institute ASCII American Standard Code for Information Interchange ASIC Application Specific Integrated Circuit...
  • Page 185 Glossary DMD20 Universal Satellite Modem Digital to Analog Converter Decibels Decibels Referred to Carrier Decibels Referred to 1.0 milliwatt Direct Current Demod Demodulator or Demodulated DPLL Digital Phase Locked Loop Digital Video Broadcast D&I Drop and Insert Ratio of Energy per bit to Noise Power Density in a 1 Hz Bandwidth.
  • Page 186 DMD20 Universal Satellite Modem Glossary Intelsat Business Services Intermediate Data Rate Input/Output IEEE International Electrical and Electronic Engineers IESS INTELSAT Earth Station Standards Intermediate Frequency INTELSAT International Telecommunication Satellite Organization International Standards Organization I&Q Analog In-Phase (I) and Quadrature Signals (Q)
  • Page 187 Glossary DMD20 Universal Satellite Modem Normally Closed Normally Open Nanoseconds NVRAM Non-Volatile Random Access Memory No Connection or Not Connected OQPSK Offset Quadrature Phase Shift Keying Personal Computer PD Buffer Plesiochronous/ Doppler Buffer Phase Locked Loop Parts per Billion Parts per Million...
  • Page 188 DMD20 Universal Satellite Modem Glossary To Be Designed or To Be Determined Technical Manual Turbo Product Codes Trellis Transmit (Transmitter) Transmit Data UART Universal Asynchronous Receiver/Transmitter Unit Under Test Volts Volts, Alternating Current Voltage Controlled Oscillator Volts, Direct Current Viterbi Decoding...
  • Page 189 Glossary DMD20 Universal Satellite Modem TM105 – Rev. 1.1...

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