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ViaSat VBM-1400 Installation And User Manual

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  • Page 1 Cover page and spine inserts - 67 pound vellum bristol, pastel blue in color Binder to have front cover page and spine inserted with copy First article printed shall be page-checked for correct format and legibility by ViaSat. The printing service provider shall randomly check additional copies for correct format and legibility.
  • Page 3 Broadband Modulator VBM-1400 Installation and User’s Guide ViaSat Document Number 1018360 (Rev. 002) ViaSat, Inc. 6155 El Camino Real Carlsbad, CA 92009-1699 Tel: (760) 476-2200 Fax: (760) 929-3941 www.viasat.com...
  • Page 5 Broadband Modulator, VBM-1400 Installation and User’s Guide...
  • Page 7 Broadband Modulator VBM-1400 Installation and User’s Guide ViaSat Document Number 1018360 (Rev. 002) ViaSat, Inc. 6155 El Camino Real Carlsbad, CA 92009-1699 Tel: (760) 476-2200 Fax: (760) 929-3941 www.viasat.com...
  • Page 8 REGULATORY COMPLIANCE and NOTICES FCC Notice This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15, of the FCC Rules. These limits are designed to provide a reasonable protection against harmful interference when the equipment is operated in a commercial environment.
  • Page 9 Printed in the United States of America TRADEMARK NOTICE ViaSat and the ViaSat logo are registered trademarks of ViaSat, Inc. in the U.S. and/or other countries. Other product names included in this document are trademarks of their respective owners. DOCUMENTATION NOTICE The information, specifications, and features contained in this document are subject to change without notice and should not be construed as a commitment by ViaSat, Inc.
  • Page 11 VBM-1400 Broadband Modulator Installation and User’s Guide Revision History Revision Rationale Release Date Affected Initial Release 12 October 2004 All pages Added: 3 March 2005 All pages Regulatory compliance statements New remote command - CMD: “SYS_NV x” Extranet information Revised Safety Precautions page format.
  • Page 12 VBM-1400 Broadband Modulator Installation and User’s Guide 1018360 Rev. 002...
  • Page 13 VBM-1400 Broadband Modulator Installation and User’s Guide Warnings, Cautions, and Notes Safety precautions or important information found in this document will normally be presented just prior to the point where the hazard is likely to be encountered. Symbols used to identify the information are...
  • Page 14 VBM-1400 Broadband Modulator Installation and User’s Guide 1018360 Rev. 002...
  • Page 15 SNMP MIB downloads, software updates, training schedules, and other technical information may be found on the ViaSat Extranet web site. The Extranet may be accessed through the ViaSat web site located at this URL: http://viasat.com/...
  • Page 16 VBM-1400 Broadband Modulator Installation and User’s Guide 1018360 Rev. 002...

  • Page 17: Table Of Contents

    NTRODUCTION ..............................1-1 QUIPMENT VBM-1400 S ..........................1-2 PECIFICATIONS 1.3.1 VBM-1400 Description..........................1-5 1.3.2 VBM-1400 Front Panel Controls and Indicators ..................1-6 PREPARATION FOR USE AND INSTALLATION....................2-1 ............................... 2-1 NTRODUCTION ..........................2-1 OOLS AND QUIPMENT ..........................2-1 NPACKING AND NSPECTION ...............................
  • Page 18 VBM-1400 Broadband Modulator Installation and User’s Guide 3.3.4.3 Auxiliary Parameters..............................3-6 3.3.4.3.1 Revisions ................................3-6 3.3.4.3.1.1 Firmware Revisions ............................3-6 3.3.4.3.1.2 Hardware Revisions ............................3-6 3.3.4.3.1.3 Serial Numbers............................... 3-6 3.3.4.3.2 Clock ..................................3-7 3.3.4.3.2.1 Time ................................3-7 3.3.4.3.2.1.1 Edit Time ..............................3-7 3.3.4.3.2.2...
  • Page 19 VBM-1400 Broadband Modulator Installation and User’s Guide 4.6.1 EIA-485 Bus Address........................... 4-10 4.6.2 EIA-485 Data Format..........................4-11 4.6.3 EIA-485 Data Rate ............................4-11 GENERAL THEORY OF OPERATION ......................... 5-1 ............................5-1 OWER ISTRIBUTION ............................5-1 ONITOR AND ONTROL ............................... 5-2...
  • Page 20 List of Figures Figure 1-1 Typical BER vs. Eb/No. Performance........................ 1-4 Figure 1-2 VBM-1400................................1-5 Figure 1-3 VBM-1400 Front Panel Controls and Indicators ....................1-6 Figure 2-1 VBM-1400 Installation Location (Typical) ......................2-2 Figure 2-2 VBM-1400 Rear Panel ............................2-3 Figure 2-3 VBM-1400 Output Observation Connections.....................

  • Page 21: General Description

    Table 1-1 Furnished, Optional, and User Supplied Items. Furnished Items VBM-1400 Broadband Modulator Power Cord Optional Items Serial cable and/or adaptor for connection to VBM-1400 remote port. User Supplied Items Antenna System and connecting cables Baseband data input Remote controller PC or “Dumb Terminal”...

  • Page 22: Vbm-1400 Specifications

    VBM-1400 Broadband Modulator Installation and User’s Guide General Description VBM-1400 Specifications The specifications for the VBM-1400 are listed in Table 1-2. Table 1-2 VBM-1400 Specifications Item Specification Modulator Specifications ----------------------- ----------------------- Symbol Rates 5-30 Msym/sec in 1sym/sec increments Spectral Shaping 20%, 25%, 35% SRRC, programmable Modulation &...
  • Page 23 VBM-1400 Broadband Modulator Installation and User’s Guide General Description Table 1-2 VBM-1400 Specifications Item Specification Monitor & Control (M&C) functions ----------------------- Front Panel Interface LCD and keypad for viewing and setting modulator parameters FPGA Updates Supports field upgrades for all FPGAs and the M&C processor code via...

  • Page 24: Figure 1-1 Typical Ber Vs. Eb/No. Performance

    VBM-1400 Broadband Modulator Installation and User’s Guide General Description VBM-1400 BER vs. Eb/No 8PSK 5/6 15MSPS 8PSK 2/3 15MSPS QPSK 1/2 15MSPS 1.00E+00 1.00E-01 1.00E-02 1.00E-03 1.00E-04 1.00E-05 1.00E-06 1.00E-07 1.00E-08 1.00E-09 1.00E-10 1.00E-11 Eb/No Figure 1-1 Typical BER vs. Eb/No. Performance.

  • Page 25: Vbm-1400 Description

    VBM-1400 Broadband Modulator Installation and User’s Guide General Description 1.3.1 VBM-1400 Description The VBM-1400 (Figure 1-2) is a broadband, high-speed, rack-mount Note The VBM-1400 is modulator that contains the components necessary to accept MPEG complelely self-contained, frame input, apply the proper modulation/code process, and output a and contains no user continuous symbol-rate waveform at a frequency of 50 –...

  • Page 26: Vbm-1400 Front Panel Controls And Indicators

    VBM-1400 Broadband Modulator Installation and User’s Guide General Description 1.3.2 VBM-1400 Front Panel Controls and Indicators The VBM-1400 front panel contains the controls and indicators shown and described in Figure 1-3. Numeric Entry Keys Enter and Status Liquid Cursor Clear...

  • Page 27: Preparation For Use And Installation

    Table 1-1. Tools and Test Equipment Installation of the VBM-1400 requires the tools, and test equipment listed in Table 2-1. Items equivalent in function may be substituted.

  • Page 28: Installation

    ° Figure 2-1 VBM-1400 Installation Location (Typical) Using proper support, locate the VBM-1400 in the 19-inch rack. Insert and tighten four screws on each corner of the front panel to Caution The VBM- 1400 must be supported secure the unit in the rack.

  • Page 29: Vbm-1400 Connections And Descriptions

    Preparation for Use and Installation 2.4.1 VBM-1400 Connections and Descriptions All VBM-1400 connections are on the rear panel as shown in Figure 2-2. Refer to Table 2-2, and complete the following steps: 1. Connect the power cord to the AC connector.

  • Page 30: Table 2-2 Rear Panel Connectors

    VBM-1400 Broadband Modulator Installation and User’s Guide Preparation for Use and Installation Table 2-2 Rear Panel Connectors Label Type Mate Description/Function Desig DVB/M2P IN DB-25 (F) DB-25 (M) Data input MPEG2 format. (Front panel selectable). Provides the baseband data input to the VBM- 1400.

  • Page 31: Table 2-3 Dvb/M2P In (J1) Pin Descriptions

    VBM-1400 Broadband Modulator Installation and User’s Guide Preparation for Use and Installation Table 2-3 DVB/M2P IN (J1) Pin Descriptions DVB-SPI ASI Mode Signal Name Signal Name Signal Name SPI_CLK+ M2P_INCLK+ BYTE_CLK_A+ (Out) M2P_CLK+ 40_96 MHZ+ (In) SPI_D7+ M2P_SYNC+ SPI_D6+ M2P_VALID+...

  • Page 32: Vbm-1400 Output Observation

    VBM-1400 Broadband Modulator Installation and User’s Guide Preparation for Use and Installation Table 2-5 ALARM (J4) Pin Descriptions Signal Description MAJ_ALARM_NC Major Alarm Normally Connected MAJ_ALARM_COM Major Alarm Common MAJ_ALARM_NO Major Alarm Normally Open Ground Not Used MOD_FAULT_ALARM Modulator Fault Alarm...

  • Page 33: Power

    When the above steps are successfully completed, initial the table in Appendix B. 2.4.2 Operation After setting the equipment parameters using the front panel display and controls, operation of the VBM-1400 is fully automatic. To configure the equipment parameters, refer to Section 3. Rev. 002 1018360...
  • Page 34 VBM-1400 Broadband Modulator Installation and User’s Guide Preparation for Use and Installation 1018360 Rev. 002...

  • Page 35: Initial Set Up And Configuration

    VBM-1400 may be operated remotely using the REMOTE connector on attempting to operate the rear panel. the equipment. A summary of actions necessary to set up the VBM-1400 are listed in Table 3-1. Refer to subsequent paragraphs for details. Table 3-1 VBM-1400 Set Up Quick Guide and Summary Action Summary 3.2.1...

  • Page 36: Modulator Parameters

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.1 Modulator Parameters Modulator related parameters are displayed and set from the Note Pressing the ENTER MODULATOR MENU as described in the following paragraphs. key when certain menus...

  • Page 37: Tx Power Detect

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.1.4.1 TX Power Detect Shows a relative transmit power level as seen by the power detect circuit. 3.3.1.5 Transmit Shows and sets the current transmit status (On/Off). If desired, change the setting of the transmit signal by pressing the ENTER key and using the up/down cursor keys, change the setting as desired.

  • Page 38: Interface Mpeg Sync Delete

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.2.2 Interface MPEG Sync Delete Shows and sets the current interfaces MPEG synchronization byte delete state. This function strips out the MPEG Header Sync Byte when enabled. If desired, change the interface MPEG synchronization delete setting by pressing the ENTER key and using the cursor keys, change the setting as desired.

  • Page 39: Ethernet Parameters

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.3.4 Ethernet Parameters Press the down cursor key when the ETHERNET MENU is displayed to view or change Ethernet parameters as follows. 3.3.3.4.1 MAC Address If desired, change the address by pressing the ENTER key, and using the cursor keys, and numeric keypad, change the setting as desired.

  • Page 40: Reference Frequency

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.4.2 Reference Frequency Reference frequency parameters are displayed and set from the REFERENCE MENU as described in the following paragraphs. 3.3.4.2.1 External Reference External reference frequency parameters are displayed and set from the EXT REF MENU as described in the following paragraphs.

  • Page 41: Clock

    VBM-1400 Broadband Modulator Installation and User’s Guide Initial Set Up and Configuration 3.3.4.3.2 Clock Additional clock parameters are displayed and/or set using the CLOCK MENU as described in the following paragraphs. 3.3.4.3.2.1 Time From the TIME menu, observe the current Time.

  • Page 42: Front Panel Backlight Off Timer

    Connect test equipment to the TX MON port and verify spectrum looks normal. When the above steps are successfully completed, initial the table in Appendix B. If the VBM-1400 fails to transmit the uplink signal, refer to Section 6. Normal Operations When properly connected and configured, the VBM-1400 operates unattended.

  • Page 43: Remote Control

    1. Ensure the remote controller, “dumb terminal” or PC is connected as described in paragraph 2.4.1. 2. Turn VBM-1400 power on using the I - O rocker switch on the rear panel above the power cord connection. 3. Observe all front panel LEDs go on, and then go off after about 2 seconds.

  • Page 44: Power (-Dbm)

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.2.2 Power (-dBm) CMD: “MOD_PWR x” Query current power setting. x=PP.P Set transmit power level. 70/140 MHz: PP.P = -0.0 to –25.0 dBm 950-1450 MHz: PP.P = -5.0 to –30.0 dBm RSP: “MOD_PWR PP.P”...

  • Page 45: Transmit State

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.2.6 Transmit State CMD: “MOD_TX x” Query current transmit state. x=TTT Set transmit state. TTT = ON or OFF RSP: “MOD_TX TTT” RSP: “MOD_TX ERROR” 4.2.7 Carrier State CMD: “MOD_CAR x”...

  • Page 46: Modulator Data Interface Commands

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control MODULATOR DATA INTERFACE COMMANDS This section contains the supported Command and Response strings for the Modulator (user) Data Interface (MDI). 4.3.1 Interface Selection CMD: “MDI_SEL x” Query current interface type. x=SSS Set interface selection.

  • Page 47: System Common Commands

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control SYSTEM COMMON COMMANDS This section contains the supported Command and Response strings for system common functions (SYS). 4.4.1 System Soft Reset CMD: “SYS_RST TRUE” 4.4.2 System External Reference Control CMD: “SYS_ER_EN x”...

  • Page 48: System Firmware Revisions (Query Only)

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.4.5 System Firmware Revisions (QUERY ONLY) CMD: “SYS_REV x” Query current system firmware revisions. RSP: “SYS_REV S” or RSP: “SYS_REV ERROR” S = Series of parameter & value strings indicating current revision: SYS_REV M&C NAME=S...

  • Page 49: System Defaults

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.4.8 System Defaults CMD: “SYS_NV x” x = SET DEFAULTS Sets the defaults for variables in non-volatile memory RSP: None 4.4.9 System Chassis SN CMD: “SYS_SNCHS x” Query current serial number.

  • Page 50: System Rf Board Sn

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.4.12 System RF Board SN CMD: “SYS_SNRF x” Query current serial number. x=SSS Set serial number. SSS = Alpha/Numeric SN 3 to 12 characters. RSP: “SYS_SNRF SSS” or RSP: “SYS_SNRF ERROR”...

  • Page 51: System Status (Query Only)

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.4.16 System Status (QUERY ONLY) CMD: “SYS_STAT x” Query current system status. RSP: “SYS_STAT S” or RSP: “SYS_STAT ERROR” S = Series of parameter & value strings indicating current status: SYS_STAT MOD_SR S...

  • Page 52: Human I/O Commands

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control HUMAN I/O COMMANDS This section contains the supported Command and Response strings for controlling the human operator front panel interface (HIO). 4.5.1 Front Panel Lockout CMD: “HIO_LCK x” Query current front panel lockout state.

  • Page 53: Eia-485 Data Format

    VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 4.6.2 EIA-485 Data Format CMD: “RIO_485_FMT x” Query current EIA-485 data format. x=DPS Set EIA-485 data format. DPS = 8N1 RSP: “RIO_485_FMT DPS” or RSP: “RIO_485_FMT ERROR” 4.6.3 EIA-485 Data Rate CMD: “RIO_485_BAUD x”...
  • Page 54 VBM-1400 Broadband Modulator Installation and User’s Guide Remote Control 1018360 Rev. 002 4-12...

  • Page 55: General Theory Of Operation

    VBM-1400 Broadband Modulator Installation and User’s Guide General Theory of Operation 5. General Theory of Operation This section contains a basic block diagram description of the VBM- 1400. Each functional area is described below. See Figure 5-1 throughout the discussion.

  • Page 56: Reference Signal

    VBM-1400 Broadband Modulator Installation and User’s Guide General Theory of Operation • Input Data Activity • Sync Bytes Detected • RF PLL Status • RF Output Power Level • Modulator Closed Loop Power Control Status • Master Oscillator PLL Status •...

  • Page 57: Maintenance Instructions

    6.2.2 Inspection of Cable Assemblies and Connectors Inspect all cables attached to the VBM-1400 as described below. 1. Inspect each cable for dents, twists, flattening, abraded jacket, or other signs of damage. Observe the bend angle for a wrinkled cable cover.

  • Page 58: Cleaning Vbm-1400 Chassis

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.3.1 Cleaning VBM-1400 Chassis Clean the external surfaces of the chassis periodically using a small vacuum cleaner or soft brush. In dusty/dirty conditions, it may be necessary to increase the periodic cycle.

  • Page 59: No Power

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.1 No Power Is input power correct? Apply Correct Input Power. Is the chassis plugged in? Plug it in Exit Is the Power Switch Turn it on Call Distributor or Exit...

  • Page 60: No Remote Control

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.2 No Remote Control Is front panel REMOTE LED on? Go to RIO menu, and Did this fix the problem? enable remote control. Are remote control Exit parameters set properly? Is remote control cable...

  • Page 61: No Output Signal From Unit

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.3 No Output Signal from Unit Is the OUTPUT ON LED lit? Go to Transmit ON/OFF Exit menu and set to ON. Are MAJOR or MINOR FAULT LEDs on? Go to indicated Fault LED flowchart and then start again.

  • Page 62: Major Fault Led On

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.4 MAJOR FAULT LED On NOTE: A major fault usually indicates a problem in the data or RF path. Check MAJOR FAULTS Menu Is the fault 'Ext Ref PLL'? Attempt to correct by checking External Reference connection and frequency.

  • Page 63: Minor Fault Led On

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.5 MINOR FAULT LED On NOTE: A minor fault usually indicates an external problem. Check MINOR FAULTS Menu Do any of the sub-menus indicate FAULT? Attempt to correct indicated FAULT as shown on sub-menu...

  • Page 64: No Or Incorrect Display

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.6 No or Incorrect Display Is the POWER LED on? Check power cord and/or turn Exit on power. Does recycling power fix trouble? Exit Call Distributor or ViaSat as applicable. Figure 6-6 No or Incorrect Display 1018360 Rev.

  • Page 65: No Or Incorrect Led Operation

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions 6.5.7 No or Incorrect LED Operation Recycle power. LED indication still incorrect? Exit Call Distributor or ViaSat as applicable. Figure 6-7 No or Incorrect LED Operation Rev. 002 1018360...

  • Page 66: Removal And Replacement

    VBM-1400 Broadband Modulator Installation and User’s Guide Maintenance Instructions Removal and Replacement For removal and replacement of the VBM-1400, refer to paragraph 6.6.1 and 6.6.2. 6.6.1 Removing the VBM-1400 To remove a VBM-1400 chassis, follow these steps. 1. Disconnect the power cable to the VBM-1400.

  • Page 67: Reshipment

    ® Additional information is available at our customer extranet located here: http://extranet.viasat.com/vsat/ 2. After receiving the RMA form and number from ViaSat , fill out the ® designated parts, and enclose the RMA form with the equipment. Make sure all parts of the RMA form are complete.
  • Page 68 VBM-1400 Broadband Modulator Installation and User’s Guide Reshipment 1018360 Rev. 002...

  • Page 69: Appendix Avbm-1400 Parameter Worksheet

    VBM-1400 Broadband Modulator Installation and User’s Guide VBM-1400 Parameter Worksheet Appendix A VBM-1400 Parameter Worksheet The following table may be used by the Installer to record and configure the VBM-1400 parameters. Site Location: _____________________________________________ Date:_____________________________ VBM-1400 Part Number: ______________________ VBM-1400 Serial Number: _____________________...
  • Page 70 VBM-1400 Broadband Modulator Installation and User’s Guide VBM-1400 Parameter Worksheet 1018360 Rev. 002...
  • Page 71 VBM-1400 Broadband Modulator Installation and User’s Guide Installation Checklist Appendix B Installation Checklist This appendix contains a checklist for the installer to ensure that all steps necessary for the correct installation and initial operation of the equipment are complete. Column 1 refers to the section and step number in this guide for cross- reference.
  • Page 72 VBM-1400 Broadband Modulator Installation and User’s Guide VBM-1400 Installation Checklist VBM-1400 Site Location: __________________________ Date/Time Started: _______________ Primary VBM-1400 Ser. No.: ___________ Date/Time Completed: ______________ Installer: _______________________________________ _____________________________________ (Print Name and Title) (Signature) Customer: ______________________________________ _____________________________________ (Print Name and Title) (Signature) Para./Step No.

  • Page 73: Appendix Cglossary

    VBM-1400 Broadband Modulator Installation and User’s Guide Glossary Appendix C Glossary The following acronyms and terms are used in this Manual. AMM – Audio and Multimedia ASI - Asynchronous Serial Interface – Interface used with asynchronous transmission. asynchronous - type of data communications in which there is no synchronizing clock between the transmitter and the receiver;...
  • Page 74 VBM-1400 Broadband Modulator Installation and User’s Guide Glossary Accommodates data-transmission rates from 0 to 20 kpbs/50 ft. Employs unbalanced signaling, and is usually used with a 25-pin D-shaped connector. EIA-485 - (Formerly RS-485) Recommended Standard Number 485 as defined by the Electronics Industry Association (EIA);...
  • Page 75 VBM-1400 Broadband Modulator Installation and User’s Guide Glossary msec – millisecond MSPS – Megasymbols per second (also Msym/s) ODU - Outdoor Unit PC - Personal Computer PLL - phase-locked loop Protocol - a rigidly defined set of rules for communication across a network.
  • Page 76 VBM-1400 Broadband Modulator Installation and User’s Guide Glossary 1018360 Rev. 002...
  • Page 77 VBM-1400 Broadband Modulator Installation and User’s Guide Index Appendix D Index cable assemblies ............6-1 packaging..............7-1 Caution Definition ............iii power cord ............6-2, 6-10 cleaning ............... 6-2 connections..............2-3 connectors ..............6-1 removal and replacement........... 6-10 controls and indicators ..........1-6 Return Material Authorization........
  • Page 78 VBM-1400 Broadband Modulator Installation and User’s Guide Index 1018360 Rev. 002...

  • Page 79: Appendix Edrawings

    VBM-1400 Broadband Modulator Installation and User’s Guide Drawings Appendix E Drawings Rev. 002 1018360...
  • Page 80 VBM-1400 Broadband Modulator Installation and User’s Guide Drawings 1018360 Rev. 002...
  • Page 81 VBM-1400 Broadband Modulator Installation and User’s Guide Drawings Press cursor key to display VBM-1400 VBM-1400 Power ON Notes: INITIALIZING MODULATOR main top level menus. indicates cursor key movement to select additional menus. MODULATOR INTERFACE REMOTE I/O SYSTEM COMMON FRONT PANEL indicates preset selections available.

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