Datum Systems PSM-500 Installation And Operation Manual
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Datum Systems PSM-500 Installation And Operation Manual

M500 vsat/scpc satellite modem
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M500 VSAT/SCPC Satellite Modem
PSM-500/PSM-500L/500LT
Installation and Operation Manual
Revision 0.91

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Summary of Contents for Datum Systems PSM-500

  • Page 1 M500 VSAT/SCPC Satellite Modem PSM-500/PSM-500L/500LT Installation and Operation Manual Revision 0.91...

  • Page 3: Table Of Contents

    ......................... vii Revision History ..........................viii Pen and Ink Changes Made to this Manual ................viii Chapter 1 - PSM-500 Modem Description ..................1-1 1.0 Introduction ..........................1-1 1.0.1 How to Use This Manual ....................1-1 1.0.2 Quick Start for Experienced Modem Users ..............1-2 1.0.3 What’s New –...
  • Page 4 PSM-500/500L/500LT SCPC Satellite Modem Table of Contents 1.2.7.1.1 AUPC Control Channel (AUPC) ............1-15 1.2.7.1.2 Remote Modem Control Channel (RMC) ..........1-15 1.2.7.1.3 Auxiliary Bit Control Channels (RFC) ........... 1-15 1.2.8 Standard and Optional Modem FEC Cards ............... 1-15 1.2.8.0 Special Codec CT Modes ................. 1-18 1.2.8.1 Viterbi, Trellis Code Modulation Codec ............
  • Page 5 PSM-500/500L/500LT SCPC Satellite Modem Table of Contents 2.6 Modem Terminal Mode Control ................... 2-13 2.7 Self-Test Mode ........................2-14 2.8 IF Loop-back Test Mode ...................... 2-14 2.8.1 Built-in BERT ......................2-14 2.9 Modem Configuration ......................2-15 2.9.0 Configuring the Modem for Operation ................ 2-15 2.9.1 Setting Essential Parameters ..................
  • Page 6 3.1.3.5 Finding Modem Parameter Limits ............... 3-7 3.2 Front Panel Monitor and Control Parameters ................ 3-7 Table 3-1 PSM-500 Front Panel Parameter Matrix – Unit Sheet ........3-9 Table 3-4 PSM-500 Front Panel Parameter Matrix – Interface Sheet ......3-11 Table 3-5.
  • Page 7 PSM-500/500L/500LT SCPC Satellite Modem Table of Contents 3.6.1 L-Band BUC Control ....................3-32 3.6.2 L-Band LNB Control ....................3-32 3.7 Data Interface Clock Options ....................3-32 3.7.1 VSAT Mode ........................ 3-32 3.7.2 SCPC Mode ........................ 3-33 3.7.3 Transmit Interface Clock Auto Mode ................3-33 3.8 Automatic Uplink Power Control (AUPC) Operation ............
  • Page 8 D. Data Interface........................4-20 E. Manual ..........................4-21 Appendices Appendix A – PSM-500 Technical Specifications ............... A–1 Appendix B – Remote Control Command Protocol ............B–1 Appendix C – Cabling Specifications .................. C–1 Appendix MUX – Framing/Multiplexer Addendum ............MUX–1 Appendix TPC –...

  • Page 9: Safety Notice

    This equipment has been designed in accordance with UL and CSA standards for Safety of Information Technology Equipment. The PSM-500 Modem contains potentially lethal voltages inside the case. Extreme caution should be exercised when the cover is removed by following the precautions listed below Never operate the equipment with the cover removed.

  • Page 10: About This Manual

    The electronic format is produced as a universal Adobe Acrobat readable file, and can be requested directly from Datum Systems, Inc., or via download from the web at www.datumsystems.com. The electronic format on the web is always the latest revision.

  • Page 11: Chapter 1 - Psm-500 Modem Description

    950 ~ 1900 MHz 950 ~ 1900 MHz The PSM-500 with a standard 70 (or 140) MHz IF is the first member of Datum Systems’ M500 Class Modem products, representing a major extension to our fifth generation of innovative design concepts proven and refined over ten years of production.

  • Page 12: Quick Start For Experienced Modem Users

    The term PSM-500 is used throughout this manual where references apply to either the PSM-500, 500L or 500LT modems. Where a subject is specific to one modem the “L” or “LT” suffix is used or the specific differences in operation between the three modem versions are detailed.

  • Page 13: Modem Feature Set Variations

    Description 1.1.2 Modem Feature Set Variations Feature sets are specific capabilities that suit a modem for a particular purpose. The PSM-500 series is the first modem Datum Systems has offered with variable feature sets. The advantage is that a customer does not have to pay for features he does not use, but later features can be upgraded in the field electronically by adding new firmware Intellectual property to the modem.

  • Page 14: Applications

    In SCPC point-to-point links the power required from the satellite or the size of the receive antenna is dependent upon the modem receive performance. The PSM-500 modem uses the most rigorous methods to maintain performance as close to the theoretical “waterfall” curves as possible. In most cases the modem will perform at 0.1 to 0.2 dB from the curve (although we say “typically”...

  • Page 15: Dama (Demand Assigned Multiple Access)

    The PSM-500 modem is uniquely designed to significantly reduce this time: The fast acquisition digital signal processor used in the PSM-500 looks at the receive signals within its acquisition range much like a person might view the same region using a spectrum analyzer. It then “homes in”...

  • Page 16: Modem Functional Assemblies

    Another variation could use both the DAMA (star or mesh configuration) with a concurrent TDMA system as the monitor/control network for the DAMA. Again the PSM-500 modem is ideally suited for both modem applications at both low and high speeds.

  • Page 17: Figure 1-2 Modem Block Diagram

    PSM-500/500L/500LT SCPC Satellite Modem Description Figure 1-2 Modem Block Diagram PSM-500/500L/500LT - Rev. 0.91 Page 1-7...

  • Page 18: Modulator

    Description PSM-500/500L/500LT SCPC Satellite Modem 1.2.1 Modulator The PSK/QAM modulator in the modem employs a unique digital modulation scheme requiring no heterodyne operations (mixing and filtering to an IF) to arrive at the transmit RF frequency. The desired carrier frequency is synthesized and directly modulated with the baseband signal. The baseband signal is itself digitally derived and generated using a digital to analog (D/A) converter.

  • Page 19: Demodulator

    PSM-500/500L/500LT SCPC Satellite Modem Description Note: As of the time of this manual the burst mode is a special factory request option and not installed in standard modems. The Modulator IF output can be routed to the Demodulator input using a built-in “IF Loop-back”...

  • Page 20: Modem Bit Rate Timing

    Second, due to the higher data rates the PSM-500 input circuitry automatically fine tunes the clocks to attempt to place the data period at the optimal point with respect to the clocks. This also helps tremendously when using the TT clock to create the transmit timing.

  • Page 21: Figure 1-3 Clock Source Options

    PSM-500/500L/500LT SCPC Satellite Modem Description Send Data From DATA Interface Send Timing To CLOCK Modulator Interface Terminal Terminal Timing Timing From Interface External Send Timing Input (Rear Panel) Modulator bit clock source is selected from "Internal", "Terminal Internal Timing", "External" or "RCV...

  • Page 22: Control Processor

    0.2 seconds using the acquisition processor vs. over 20 seconds using a standard sweep. 1.2.6 Standard Data Interface The standard Interface in the PSM-500 is built onto the main PWB and contains the drivers and receivers for one of five possible data interface standards (seven including minor variations of each).

  • Page 23: Data Interface Loop-Back Function

    The un-terminated versions of these standard interfaces and are used to implement one for one (1:1) redundancy between two PSM-500 units. A single 37 pin “D” type female connector is available on the rear panel at J3 providing the terrestrial data interface.

  • Page 24: Standard Framing And Ibs Multiplexer

    Description PSM-500/500L/500LT SCPC Satellite Modem 1.2.7 Standard Framing and IBS Multiplexer The 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.

  • Page 25: Modem Control Channel (Mcc)

    PSM-500/500L/500LT SCPC Satellite Modem Description 1.2.7.1 Modem Control Channel (MCC) The MCC is available in both the Enhanced and Custom Multiplexer modes. In the Enhanced mode the MCC provides for an AUPC channel. In the Custom mode the MCC provides for the AUPC plus the Remote Modem Control (RMC) Channel and the Auxiliary control bits (RFC).
  • Page 26 The standard PSM-500 FEC card includes the circuitry for a Viterbi, TCM and Reed-Solomon Codec providing the PSM-500 with basic functional capability for all standard operating parameters including 8PSK TCM and 16QAM. The following are general descriptions of the characteristics of each of these functions.
  • Page 27 R-S at 220, 200, depth of 4. R-S is auto-enabled 6. TPC Advanced modes are Datum Systems proprietary implementations that require the TPC16k option only for the colored lines. They offer superior performance to CT modes PSM-500/500L/500LT - Rev.

  • Page 28: Special Codec Ct Modes

    A full block must be received before processing can begin, thus adding to the latency. The PSM-500 type R-S Codec is capable of operating in multiple standard and custom modes as shown in the table below.
  • Page 29 PSM-500/500L/500LT SCPC Satellite Modem Description Transmit Transmit Data Channel Terrestrial Data Channel Transmit Reed-Solomon Transmit Reed-Solomon Block Encoder & Block Interleaver Synchronous Scrambler Clock and Frame Main Modem Multiplex Processor Clocks Generation Assembly Option Receive Terrestrial Data Receive Data Channel...

  • Page 30: Turbo Product Codes Fec Capability

    Reed-Solomon concatenated on Viterbi or 8PSK/TCM with Reed-Solomon. The PSM-500 series offers extensive TPC capabilities including both first generation 4k block TPC with both PSM-4900 compatibility (M5) and Competitive Technology (CT) operating modes plus a newer second generation 16k block TPC. This second TPC offers superior performance at the expense of more delay due to larger processing blocks.

  • Page 31: Optional Interface Capability

    The M500 modems are also capable of accepting optional interface cards to replace the standard synchronous serial interfaces. The first of these cards is the Ethernet interface embodied in the Datum Systems’ Satellite Network Interface Processor, or “SnIP”. The SnIP is more fully explained in Appendix SNIP.

  • Page 33: Chapter 2 - Installation

    Including cabling, a minimum of 15-inches of rack depth is required. The rear panel of the PSM-500 is designed to have power enter from the left and IF cabling enter from the right when viewed from the rear. Data and control cabling can enter from either side although they are closer to the left.

  • Page 34: Modem Connections

    The modem is designed for indoor applications only. The only tools required for rack mounting the PSM-500 is a set of four rack mounting screws and an appropriate screwdriver. Rack mount brackets are an integral part of the front panel plate of the unit and are not removable.
  • Page 35 PSM-500/500L/500LT SCPC Satellite Modem Installation The Modulator 70 MHz IF Output at female BNC J7 50 – 90 MHz Programmable +5 to –35 dBm output at 75Ω Programmable +3 to –35 dBm output at 50Ω. The L-Band Modulator (PSM-500L) L-Band IF Output at female Type N J7 950 –...
  • Page 36 Installation PSM-500/500L/500LT SCPC Satellite Modem The ESC channel connection at 37-pin male “D” sub connector J4 (AUX). (When the optional IBS multiplexer is enabled). See Appendix C, “Cabling Specifications” for the pins used for each of the following interfaces available on the “AUX” connector.

  • Page 37: Figure 2-1 Modem Rear Panel

    PSM-500/500L/500LT SCPC Satellite Modem Installation Figure 2-1 Modem Rear Panel PSM-500/500L/500LT - Rev. 0.91 Page 2-5...

  • Page 38: Data Interface Pin Connections

    Installation PSM-500/500L/500LT SCPC Satellite Modem 2.3.1 Data Interface Pin Connections The unit is supplied with an electronically programmable data interface assembly. Table 2-1 shows the pin assignments for the possible standard interfaces. Additional information aiding the creation of “adaptor” cables from the unit’s 37-pin female “D” sub connector to other types of interface connections such as V.35 “Winchester”...

  • Page 39: Connecting The Data Interface To Other Equipment

    5. The synchronous RS-232 connection is limited to 128 kbps. 2.3.1.1 Connecting the Data Interface to Other Equipment The PSM-500 physical connector is that of an RS-449 interface. The electrical interface however can be changed under front panel or remote program control to include the types of interfaces shown above.

  • Page 40: Alarm Connection

    Installation PSM-500/500L/500LT SCPC Satellite Modem Table 2–2. Remote Control Connector J6 Pin Assignment P2 Pin # Signal Name Direction Transmit B RS–485 Transmit Data (B) + Output Transmit RS–232 Transmit Signal Output Receive RS–232 Receive Signal Input Not Used Common...

  • Page 41: Auxiliary (Aux) Connection

    PSM-500/500L/500LT SCPC Satellite Modem Installation 2.3.4 Auxiliary (AUX) Connection The modem has an auxiliary connector located on the rear panel, the 37-pin male “D” sub connector J4. The pin-out of this connector is determined by option board(s) installed in the modem;...

  • Page 42: Figure 2-2 - Modem Connections For 1:1 Redundancy

    Installation PSM-500/500L/500LT SCPC Satellite Modem Note: The two modems should be at the same firmware revision for proper redundant operation. The two modems operate in a “non-priority” redundancy mode, that is, no modem is specified as “primary”, or having preference when both modems are operational. The first modem turned on assumes a non-redundancy mode until the second connected unit is powered up.

  • Page 43: Set-Up Procedure For 1:1 Redundancy

    PSM-500/500L/500LT SCPC Satellite Modem Installation 2.3.6.1 Set-Up Procedure for 1:1 Redundancy If redundancy mode is to be set up between a pair of modems then the following procedure is followed during installation, other wise this section can be skipped. In overview the procedure is: 1.

  • Page 44: Modem Checkout

    Installation PSM-500/500L/500LT SCPC Satellite Modem 2.4 Modem Checkout The following descriptions assume that the modem is installed in a suitable location with prime AC power and supporting equipment available. 2.4.1 Initial Power-Up ⇒ CAUTION: Before initial power-up of the modem, it is a good idea to disconnect the transmit output from the operating satellite ground station equipment.

  • Page 45: Parameter Setup

    PSM-500/500L/500LT SCPC Satellite Modem Installation and down arrow keys to arrive at the “Level” parameter. This is shown by convention in this manual as <Mod: IF – Level> 2.5.1 Parameter Setup Each individual item that may be read or set is referred to as a “parameter”. Parameters are arranged in a matrix of rows and columns.

  • Page 46: Self-Test Mode

    500 under test. This Test Mode should not be used on a live traffic unit. The PSM-500 provides a built–in self-test mode which uses the IF Loop-back and a predefined sequence of actions to test the basic modem operation. This test mode can be used to verify correct functioning of the modem before placing it into service.

  • Page 47: Modem Configuration

    Configuring the PSM-500 Modem operating parameters is essential before placing the unit into service. The PSM-500 Modem operating parameters may be set up using the front panel, the USB or the terminal command mode. The binary remote control input may also be used if the remote interface parameters are already known and set.

  • Page 48: Ibs Multiplexer And Reed-Solomon Selection

    Appendix RS. 2.9.1.2 Using the Proper Scrambler The PSM-500 modems now have had an “Auto” mode used to automatically select the preferred scrambler setting in any FEC or other dependent mode. This replaces the previous “IESS 308” or “IESS-309”...

  • Page 49: Using The L-Band & L Receive Rf Frequency Feature

    There are two main acquisition methods used by the PSM-500. The normal mode for fastest possible acquisition (especially at low data rates) is the “Fast” mode which utilizes an onboard digital signal processor (DSP) to mathematically determine the location of the carrier and lock as fast as possible.

  • Page 50: Initial Acquisition

    2.9.2.2 Carrier Re-acquisition For the “Search” acquisition modes the PSM-500 attempts to find a carrier in a reduced or “narrow” search range for a specified period of time before reverting to the standard search range.

  • Page 51: Sample Configuration Setting

    PSM-500/500L/500LT SCPC Satellite Modem Installation 2.9.3 Sample Configuration Setting The following procedures are used to set each of the modem’s parameters using the front panel. Assuming the modem is to be used in the SCPC mode for a point-to-point link with another PSM- 500, the following sample configuration is representative of the required procedures: For easier entry we can first set the entry mode to “Quick”.

  • Page 52: Setting Additional Parameters

    As stated before, the basic parameter settings are essential to achieve modem operation and carrier lock. There are many other parameters, which must be set on the PSM-500 to configure the unit to operate within your own system. These include setting those parameters which fall into three major categories;...

  • Page 53: Figure 2-3 - Alarm Processing

    PSM-500/500L/500LT SCPC Satellite Modem Installation Individual Alarms Processing Matrix Outputs Summary Alarm Unit Alarms Reference Test Active Alarm Relay A Hardware Modulator Alarms Alarm Relay B Carrier Bit Clock Test Active Hardware No Data Selection Demodulator Alarms Modulator Front Panel...

  • Page 54: Using The Internal Or An External Reference

    The PSM-500 allows the user to select such items as a low input level or E activate an alarm. By providing two relays and the configuration options, several alternative alarm scenarios can be used.

  • Page 55: Setting The Modem Station Id Name

    2.9.6 Setting the Modem Station ID Name Each PSM-500 contains two unique identification entries available at the front panel or remotely. They are the unit serial number and the Unit Name or “Unit ID”. The serial number is set at the factory and cannot be changed, but the Unit ID can be set and changed whenever necessary.

  • Page 56: Setting The Modem Address For Command Mode Operation

    The address “0” is also unique. This address causes the modem to accept commands and send responses without the address fields normally required in the command packets. 2.10 Interface Type Configuration The PSM-500 Modem contains on-board circuitry to implement several different interface types: Disabled RS-232 (Synchronous only, limited to 128 kbps by drivers and receivers)

  • Page 57: Option Fec Card Installation

    2.11 Option FEC Card Installation The PSM-500 Modem contains on-board circuitry and two “slot” connectors for adding several available and planned FEC option “daughter” boards. These plug into either the A or B slots on the main modem assembly. Installation of these cards is not difficult, but requires removal of the modem from service and removal of the unit’s cover, and should be accomplished only by a...

  • Page 58: Turbo Product Codes Option Installation

    In some cases when options are first introduced a software update to the modems internal program is necessary to allow use of the option. Refer to Section 4.3 “Updating Modem Software”. The Datum Systems’ M500 Update program will also recognize and install software for FEC cards present in the modem.

  • Page 59: Figure 2-5 Fec Option Card Installation

    PSM-500/500L/500LT SCPC Satellite Modem Installation J3 and J4 Connectors Rear Panel Interface Option Connector Top View M500 Series Main PCB Latches FEC Card DRA05-002 Flash TPC4k FPGA TPC16k Side View Showing Insertion Slot B must be empty to install in Slot A...

  • Page 61: Chapter 3 - Operation

    AUPC, the analog monitor output, redundancy and automatic recovery. 3.1.1 Front Panel Control The front panel of the PSM-500 allows complete control and monitor of all modem parameters and functions via a keypad, LCD display and status LEDs. 3.1.2 Front Panel Layout and Features The front panel layout shown in Figure 3–1, identifies the location and labeling of items on the...

  • Page 62: Front Panel Keypad

    Operation PSM-500/500L/500LT SCPC Satellite Modem 3.1.2.2 Front Panel Keypad The front panel keypad consists of three areas: First, is a 10-key numeric entry with 5 additional keys. Two keys provide for a “+/-” (change sign) and “.” (decimal point) function, while three more on the far right provide “Edit”, “Clear” and “Enter”.
  • Page 63 PSM-500/500L/500LT SCPC Satellite Modem Operation PSM-500/500L/500LT - Rev. 0.91 Page 3-3...

  • Page 64: Front Panel Led Indicators

    Operation PSM-500/500L/500LT SCPC Satellite Modem 3.1.2.3 Front Panel LED Indicators There are 12 LEDs on the modem front panel to indicate current status of the modem’s operation. They are separated into three columns representing (from left to right) the Modulator status, the Demodulator status and the Modem (Unit) status.

  • Page 65: Guide To Front Panel Monitor And Control

    3.1.3.1 Navigating Modem Parameters Consider that there are over 180 programmable or monitored parameters on the PSM-500 and that the LCD display can only show one parameter at a time. To simplify locating any desired parameter, they are organized into a 3 dimensional table or matrix form with 4 layers or “sheets”,...

  • Page 66: Monitoring Modem Parameters

    Operation PSM-500/500L/500LT SCPC Satellite Modem manual as <Mod: IF – Level>. We may also show selection of a specific value for the parameter using the notation <Function: Column – Row> = value(#). The value is descriptive and the # in parenthesis is the selection number key to press for optional parameters, if applicable, in the direct entry mode explained below.

  • Page 67: Automatic Modem Parameter Sequences

    3.1.3.4 Automatic Modem Parameter Sequences Certain parameters are dependent on other parameter settings. New in the PSM-500 is automatic presentation of those parameters that must be set to properly achieve the first setting entered.
  • Page 68 Operation PSM-500/500L/500LT SCPC Satellite Modem The top gray row represents column headers, which are shown on the LCD display in the upper left. Items below the header are row parameter names shown in the upper right of the LCD. Columns are navigated using the left and right arrow keys while rows are navigated using the up and down arrow keys.
  • Page 69 PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-1 PSM-500 Front Panel Parameter Matrix – Unit Sheet Status Redundcy Config Keybrd Remote Monitor Alarm Test Modem Mode Modem Mode Mode Mode Source Mode Reference Modem Reference SW Rqst Recall Entry Protocol Activity...
  • Page 70 PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-2 PSM-500 Front Panel Parameter Matrix – Modulator Sheet Status Data Alarm Test Frequency Bit Rate Mode Power Modulation Data Offset ESC Overhead Voltage Out Data Symbol Rate Clock Level FEC Options MCC Overhead Voltage Min Clock...
  • Page 71 Buffer Parameters are only visible if the Data Clock Source is not set to “Demod”, enabling the buffer. Dif Decoder is disabled and not visible with Turbo Product Codes Option installed and enabled. Table 3-4 PSM-500 Front Panel Parameter Matrix – Interface Sheet Status SnIP or SDMS Alarm...

  • Page 72: Table 3-5. Modem (Unit) Parameter Detail

    Operation PSM-500/500L/500LT SCPC Satellite Modem Tables 3-5 through 3-8 describe the parameters available from the front panel and entry in more detail. The grayed separators delineate column divisions in the area matrix. The “»”symbol indicates that this parameter is not available unless a preceding parameter is enabled or set to require those parameters, or optional hardware is installed that uses that particular parameter.
  • Page 73 PSM-500/500L/500LT SCPC Satellite Modem Operation Unit Parameter Detail Representation Type Entry Description Redundcy Sw Hold Numeric 0.0 to 600.0 seconds in 0.1 Sets the minimum time that .5 Sec second increments. a redundancy alarm must last before switching occurs. Redundcy...
  • Page 74 Operation PSM-500/500L/500LT SCPC Satellite Modem Unit Parameter Detail Representation Type Entry Description Remote Protocol Selection 0 = VT100, Remote control mode type Binary Packet 1 = Quiet VT100, 2 = Binary Packet, Remote Address Numeric 0 to 255 Address used to access this...
  • Page 75 PSM-500/500L/500LT SCPC Satellite Modem Operation Unit Parameter Detail Representation Type Entry Description Alarm Reference Selection 0=None, 1=A, 2=B, 3=A&B, Selects destination and To Alarm A 4 = Mute CXR, action taken for reference 5 = Mute & Alarm A, oscillator alarm types.

  • Page 76: Table 3-6. Modulator Parameter Detail

    Operation PSM-500/500L/500LT SCPC Satellite Modem Table 3-6. Modulator Parameter Detail Modulator Parameter Detail Representation Type Entry Description Status Read Only Read Only Modulator Carrier Status Sending, OK Status Data Read Only Read Only Modulator Input Data Status NO DATA Status...
  • Page 77 PSM-500/500L/500LT SCPC Satellite Modem Operation Modulator Parameter Detail Representation Type Entry Description Data Bit Rate Numeric 1.200 to 20,000.000 kbps Modulator Bit Rate – The max 2.100000Mbps in 1 bps resolution. Entered and min are determined by in kbps to 1bps increments.
  • Page 78 Operation PSM-500/500L/500LT SCPC Satellite Modem Modulator Parameter Detail Representation Type Entry Description Mode Selection 0 = Disabled, Enables Multiplexer to IBS Custom 1 = IBS Standard, specified mode. Enable 2 = IBS Enhanced makes other menu selection 3 = IBS Custom below visible.
  • Page 79 PSM-500/500L/500LT SCPC Satellite Modem Operation Modulator Parameter Detail Representation Type Entry Description Alarm Carrier Selection 0 = Mute CXR, Selects destination of alarm To Alarm A 1 = Mute & Alarm A, 2 = Mute & Alarm B, 3 = Mute & Alarm A & B...

  • Page 80: Table 3-7. Demodulator Parameter Detail

    Operation PSM-500/500L/500LT SCPC Satellite Modem Table 3-7. Demodulator Parameter Detail Demodulator Parameter Detail Representation Type Entry Description Status Carrier Read Only Demodulator receive Carrier Locked, OK Status Status Eb/No Read Only Measured by internal Measured Eb/No 4.7dB circuitry. Status Offset Numeric Within +/–...
  • Page 81 PSM-500/500L/500LT SCPC Satellite Modem Operation Demodulator Parameter Detail Representation Type Entry Description Eb/No Alm Numeric 1.0 to 20.0 dBm in 0.1 dB A receive Eb/No level at or 2.0dB increments below this level will produce an alarm. Low Level Alm Numeric -26 to –85 dBm in 0.1 dB...
  • Page 82 Operation PSM-500/500L/500LT SCPC Satellite Modem Demodulator Parameter Detail Representation Type Entry Description Data Descrambler Selection 0 = Disable, Scrambler types. Types are Auto 1 = Auto added if optional hardware is 2 = V.35, installed. The Auto mode uses 3 = Intelsat, , IESS 308 &...
  • Page 83 PSM-500/500L/500LT SCPC Satellite Modem Operation Demodulator Parameter Detail Representation Type Entry Description Power Selection 0 = Disabled Selects Power and Voltage to +18V 1 = +13VDC an LNB in the 500L or LT 2 = +18VDC Current Out Numeric Read Only...
  • Page 84 Operation PSM-500/500L/500LT SCPC Satellite Modem Demodulator Parameter Detail Representation Type Entry Description Test LO AFC Read Only Internal Loop Voltage +8.8V Test Step AFC Read Only Internal Loop Voltage +9.4V Test IDcOff Read Only Internal Loop Voltage. I -0.1V channel DC offset...

  • Page 85: Table 3-8. Interface Parameter Detail

    PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-8. Interface Parameter Detail Interface Parameter Detail Representation Type Entry Description Status Read Only Interface Status ** Online Status Read Only Interface RTS line status Status Read Only Interface CTS line status Status Read Only...
  • Page 86 Operation PSM-500/500L/500LT SCPC Satellite Modem Interface Parameter Detail Representation Type Entry Description Selection 0 = Normal, 1 = Force Active Interface DSR line control Normal Xmt Data Selection 0 = Normal, 1 = Inverted Transmit Data Inversion Normal Xmt Clock...

  • Page 87: Terminal Mode Control

    SDMS control is usually via the Ethernet connection. 3.3 Terminal Mode Control The PSM-500 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 88: Figure 3-2A. Terminal Mode – Example Of Unit Status Screen

    Operation PSM-500/500L/500LT SCPC Satellite Modem PSM-500 VT100 Terminal Control Unit Status Modem Demod Tst Active Reference Internal, Ok C) Redundcy Internal 1:1 D) Unit ID Model PSM-500 Serial# 13490 Version 0.10 Section ? 0)Unit, 1)Mod, 2)Demod, 3)Intf Strike Number/Letter of Option to Select, TAB Key Aborts Selection.

  • Page 89: Figure 3-3. Terminal Mode – Example Of Unit Test Screen

    PSM-500/500L/500LT SCPC Satellite Modem Operation Notice now that we can select from the Status, Configuration, Keyboard, etc. columns of the Unit Matrix. Selecting for example the “Test” item (selection 9), would display the following new screen. PSM-500 VT100 Terminal Control...

  • Page 90: Remote Command Interface Control

    PSM-500/500L/500LT SCPC Satellite Modem 3.4 Remote Command Interface Control The PSM-500 Command Mode allows the use of an external controller or computer to monitor and control the modem via a packet-based message protocol. This mode normally uses the RS– 485 connections allowing multiple modems (and other devices) to share the command link under control of a single or multiple entities.

  • Page 91: Power-Up

    PSM-500/500L/500LT SCPC Satellite Modem Operation 3.5.1 Power-Up On initial and every subsequent power-up, the modem microprocessor will test itself and several of its components before beginning its main monitor/control program. These power-up diagnostics show no results if successful. If a serious power on failure is detected, the ALARM LED is flashed at an approximate 4 Hz rate.

  • Page 92: L-Band Buc Control

    Operation PSM-500/500L/500LT SCPC Satellite Modem 3.6.1 L-Band BUC Control The PSM-500L offers 3 specific features related to the control and use of an outdoor Block Up Converter or BUC: Frequency control, power control and reference control. Transmit Frequency Control – When the BUC Local Oscillator or LO frequency is entered into the <Mod: BUC –...

  • Page 93: Scpc Mode

    DTE) of the same frequency, but not necessarily phase, as the receive data clock. 3.7.3 Transmit Interface Clock Auto Mode The PSM-500 Modem uses a transmit clock option called “Auto”, which is now the default setting. The new clock mode appears in the "Interface I/O" menu column under “Xmt Clock” and is not settable.
  • Page 94 3.8.1 AUPC Setup Guide The normal method for setting up AUPC over a point to point link is to use the PSM-500's built in multiplexer to provide the necessary communications channel. Since AUPC can be enabled in a single direction the multiplexer must be enabled in only the direction necessary to return Eb/No information to the controlled transmit modem.

  • Page 95: Demodulator Receive Data Fifo Operation

    B site. 3.9 Demodulator Receive Data FIFO Operation The PSM-500 modem has a built-in First In First Out (FIFO) buffer on the receive data channel that may be enabled to compensate for cyclical variations in the receive data rate or different systems clocks at the two link ends.

  • Page 96: Built-In 1:1 Redundancy Mode Operation

    3.10 Built-in 1:1 Redundancy Mode Operation The PSM-500 modem has a built-in 1:1 redundancy mode that allows two modems to be connected together sharing connections, but with only one unit “on-line”. The built-in software provides automatic back-up protection should the on-line unit indicate a failure by switching to a functioning off-line unit.

  • Page 97: Setting Up 1:1 Redundancy Mode

    PSM-500/500L/500LT SCPC Satellite Modem Operation • Advantage – The second or current back-up unit can be sent its full configuration from the on-line unit, making set-up extremely easy. • Advantage – Since the units are fully programmable concerning alarm content that determines the switching criteria, this method is more flexible than most redundancy schemes.

  • Page 98: Operating 1:1 Redundancy Mode

    Operation PSM-500/500L/500LT SCPC Satellite Modem programmable itself. For most applications though the default “On Any Alarm” is a preferred selection. • <Unit: Redundncy – Sw Hold> This parameter determines how long an alarm must exist on the on-line unit and not the off-line unit before switching will occur. Allowable values are 0.0 to 600.0 seconds.

  • Page 99: Removal And Replacement Of Units In Redundancy Mode

    3.11 Bit Error Rate Test (BERT) Set Operation The PSM-500 modem has a built-in BERT that can be individually enabled in the transmit and receive direction. It is capable of operating with two standard patterns; “2047” and “2^23 –1” and maintains even complex BER test results.

  • Page 100: Storing And Recalling Configuration

    3.13 Storing and Recalling Configuration The PSM-500 modem has a built-in function allowing the operator to store the current complete configuration in one of 8 numbered locations. Any stored configuration can then be recalled, including one permanent configuration called “Factory”...

  • Page 101: Special Control Mechanisms

    3.15.2 Monitors and Outputs The PSM-500 has always had the ability to send one of 3 measured parameters to an analog monitor output on the rear panel Alarm connector at pin 5 of J5. A newer monitor output added in Version 0.47 of the modem code allows putting the Data Interface RTS status onto either the A or...
  • Page 102 Operation PSM-500/500L/500LT SCPC Satellite Modem 2. The modulator responds to the DTE device when ready to transmit by activating the CTS signal. 3. Any time after the CTS is received by the DTE, the DTE starts transmitting flags and/or data. The first non–SDLC/HDLC flag character received by the modulator is the start of transmission signal, causing the modem to generate a preamble and initiate the “Carrier ON”...

  • Page 103: Chapter 4 - Maintenance

    200,000 hours. There is no external fuse on the PSM-500 Modem. The fuse is located on the power supply assembly inside the case, and replacement is not intended in the field.
  • Page 104 The PSM-500 sets the IF loop-back in <Dem: Test - IF Loopbck>. Note in this test that the near end satellite loop-back function should not be enabled whether using the internal or an external BERT.

  • Page 105: Using The Built-In Bert

    PSM-500 on the other end of the link. Since the test sequences used are industry standard it should also be possible to use the built in BERT with an external BERT and any brand of modem at the other link end, although this has not been extensively tested.

  • Page 106: Troubleshooting

    A spectrum analyzer is invaluable. So is a Bit Error Rate Test set (BERT). The PSM-500 has a built in BERT function. In most cases the first attempt at isolating a problem suspected of being within the modem is to place the modem in the Self-Test Mode.
  • Page 107 Possible Cause: Transmit and Receive scrambler or differential encoder options do not match or not enabled. Note – The differential encoder in the PSM-500 is under processor control only, but this cause could apply to a mixed system linked to another modem.

  • Page 108: Onboard Diagnostic Indicators

    Maintenance PSM-500/500L/500LT SCPC Satellite Modem Possible Cause: The FIFO automatically re-centers when an overrun or under-run condition occurs. Action: Check that the proper clocking options are used and the FIFO buffer is set large enough to handle the expected satellite Doppler shift over a 24 hour period. No amount of buffering will correct for different clocks on the input and output of the FIFO.

  • Page 109: Onboard Processor Power-On Sequence And Diagnostics

    4.3 Updating Modem Software The PSM-500 modem software and firmware are held in flash memory and can be field upgraded by several methods. The most common is to download newer software revisions via the Internet and install from a Window’s type USB capable PC using the modem’s USB control port.
  • Page 110 Maintenance PSM-500/500L/500LT SCPC Satellite Modem The complete software update “package” consists of two or three ZIP compressed files – One holding the Update program with a Window’s Installer and the other two holding the firmware images that the Update program writes to the modem. There are separate firmware files for the main unit and the FEC card The following are typical of the file types and ZIP contents, but they may change as to provide easier operation –...

  • Page 111: Update Software Installation

    PSM-500/500L/500LT SCPC Satellite Modem Maintenance “null modem” type cables). This is a standard serial extension cable available at computer outlets. Any software upgrade requires a “Control Program” hosted on the computer which transmits or “Loads” the new software to the modem. The Control Program is available with the newer software revision.

  • Page 112: Performing The Software/Firmware Update

    Maintenance PSM-500/500L/500LT SCPC Satellite Modem 1. Download the Full version of the update program which includes the program, associated files and USB drivers. Also download the latest firmware for your modem from the web site. 2. Unzip or extract the program files into the directory where you saved the download in step one.
  • Page 113 Datum Systems via email with details of what is observed. We have tried very hard to make the program as robust as possible.
  • Page 114 Maintenance PSM-500/500L/500LT SCPC Satellite Modem 3. Click on the entry box below “M500 FLASH Program File” in the right pane. This will bring up a file open dialog box. Browse to the location of the flash binary format (.fbf) files downloaded with the newer firmware version, and select the M500F or M500U file desired.
  • Page 115 PSM-500/500L/500LT SCPC Satellite Modem Maintenance NOTE: The IF version of the 70 MHz, 140 MHz and L-Band modem is determined by hardware only, and has nothing to do with the software. The modem will refuse to accept attempts to load the wrong software intended for another version.

  • Page 116: Upgrading The Modem Feature Set

    PSM-500/500L/500LT SCPC Satellite Modem 4.4 Upgrading the Modem Feature Set Each of the modems in the PSM-500 series is available currently with 3 different “Feature Sets”, M505, M511 and M523, representing basic capabilities that suit it to certain tasks. They are currently given a feature set code representing the elements of those features.

  • Page 117: Frequently Asked Questions - Faq

    A. Link Set Up and Installation. A.1 Compatibility with other Modems. How do I make the PSM-500 talk to a xxxx brand modem on the other end of a link? The PSM-500 has several new programmable features which should make this easier than ever.

  • Page 118: Operating And Performance Questions

    The PSM-500 AUPC is compatible with that in the 2100 when the PSM-500 modem IBS Multiplexer is placed in the “Enhanced” mode. It is not compatible in the “Custom” mode. How do I set up the IBS Multiplexer and AUPC Option in the PSM-500 to be compatible with the PSM-2100 Modem? The PSM-500 Modem is capable of varying the parameters for the IBS Multiplexer beyond the capabilities of the PSM-2100.
  • Page 119 Where is the “Eye Pattern” test points for the I and Q channel receive signals? The PSM-500 does not have an analog test point to view the eye pattern. All information at this point in the receive chain is digital and measured by the modem processor. The result of this measurement is presented as the Eb/No.

  • Page 120: Why Does It Do That

    –10 dBm then pressing “+/-, 12” will enter a value of –12 dBm. You could also press “1+/-2” or “12+/-” with the same result. Why doesn’t the PSM-500 front panel act like the PSM-2100 or PSM-4900? [and] How do I make it act like the PSM-2100? The PSM-500 has many more features and programmable options than the PSM-2100 modems.

  • Page 121: Remote Control

    Can I control the far end modem from the front panel of a local modem? The PSM-500 has the ability to control the far end modem (when linked and locked) from a local modem, but only using the remote control port. This ability requires enabling the Multiplexer option.

  • Page 122: Data Interface

    Can I use the built-in Bit Error Rate Test (BERT) set to test the line or DTE side equipment? Yes with reservations. The BERT is designed to normally transmit and receive to the modem side. New in the PSM-500 is the ability to electrically switch the direction that the BERT “looks” Page 4-20 PSM-500/500L/500LT - Rev. 0.91...

  • Page 123: Manual

    PSM-500/500L/500LT SCPC Satellite Modem Maintenance toward the line side. However, because of the hard wiring of the interface the pinout is fixed as a DCE device. See Maintenance Section 4.1.2 for information on using the built-in BERT. Why doesn’t my 1:1 redundant switch on certain alarms? The 1:1 redundancy logic is programmable on two levels.
  • Page 124 Maintenance PSM-500/500L/500LT SCPC Satellite Modem Abbreviation Full Text Keybrd Keyboard Liquid Crystal Display LDPC & FLDPC (Flexible) Low Density Parity Check FEC Low Noise Block downconverter Local Oscillator Loopbck Loop-back Level Maximum Modem Control Channel Minimum Modulator Multiplexer Option OverHd...

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