M500 VSAT/SCPC Satellite Modem PSM-500/PSM-500L/500LT Installation and Operation Manual Revision 0.
PSM-500/500L/500LT SCPC Satellite Modem Table of Contents Table of Contents Safety Notice .............................................................................................................. vii EMC Notice ................................................................................................................. vii Revision History ..............................................................................................................................
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.
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 ..........................
PSM-500/500L/500LT SCPC Satellite Modem Figure 2-5 Table of Contents FEC Option Card Installation ............................................................... 2-27 Chapter 3 - Operation ......................................................................................................................... 3-1 3.1 Operating Procedures ............................................................................................................ 3-1 3.1.1 Front Panel Control .............................
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 ..........................................
PSM-500/500L/500LT SCPC Satellite Modem Table of Contents 4.5 Frequently Asked Questions - FAQ ..................................................................................... 4-15 A. Link Set Up and Installation. ............................................................................................. 4-15 A.1 Compatibility with other Modems. ................................................................................. 4-15 A.2 Operating and Performance Questions. ...........................
PSM-500/500L/500LT SCPC Satellite Modem Notices 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. Never remove the cover with power applied.
Notices PSM-500/500L/500LT SCPC Satellite Modem About This Manual This manual is composed of several separable documents. They include the main body of the manual and several “Appendices”. The main body itself is separated into several “Chapters” and “Sections”. A “Section is considered a sub-section of a Chapter, such as Section 4.1.2 is a numbered section within Chapter 4. Page numbers include the Chapter, as in page 3-14.
PSM-500/500L/500LT SCPC Satellite Modem Description Chapter 1 - PSM-500 Modem Description 1.0 Introduction The Datum Systems’ PSM-500 Series are multi modulation mode VSAT/SCPC Satellite Modems. They are capable of BPSK, QPSK, OQPSK, 8PSK, 8QAM and 16QAM modulation modes on transmit and receive independently Their main use is as part of the transmitting and receiving ground equipment in a satellite communications system.
Description PSM-500/500L/500LT SCPC Satellite Modem Cabling Specification Appendix; Operating Personnel would use the Operations Chapter to become familiar with the Modem; while System Programmers would use the Remote Control Protocol to determine control requirements. The PSM-500, 500L and 500LT modems are fully interchangeable with the single exception of the IF input frequency range. In addition all options available for the PSM-500 are usable with the L or LT version.
PSM-500/500L/500LT SCPC Satellite Modem 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. The user has the best of both worlds.
Description PSM-500/500L/500LT SCPC Satellite Modem Maximum data rates are dependent on many factors besides the basic capabilities of the interface, including cabling, interface type, features and options installed. The TPC4K hardware codec is limited to 5Mbps. 1.1.3 Applications Following are just a few representative forms of satellite communications links and networks in which the PSM-500 modem series may be used. 1.1.3.
PSM-500/500L/500LT SCPC Satellite Modem Description Figure 1-1, the shape of the configuration is drawn with the central “Hub” as the center of the star and the remotes as points of the star. In both cases the transmit frequency and other parameters may be shared by the receive of all the remotes. The PSM-500L and LT are ideally suited for use at remote or small stations.
Description PSM-500/500L/500LT SCPC Satellite Modem The PSM-500L is specifically designed to be usable as the remote site modem of a TDMA network when coupled with a proper “Burst” demodulator at the hub site. Note: As of the time of this manual the “TDMA burst” mode is a special factory request option and not installed in standard modems. Another variation could use both the DAMA (star or mesh configuration) with a concurrent TDMA system as the monitor/control network for the DAMA.
PSM-500/500L/500LT - Rev. 0.91 Figure 1-2 RS-449 or V.35 or RS-232 etc. Program mable Transmit Interface DB37 Female at J3 Ready Ext FIFO Clk RClk RData RS-449 or V.35 or RS-232 etc.
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.
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” function. The loop-back path provides a 25 dB attenuator to avoid overloading the receive input. 1.2.
Description PSM-500/500L/500LT SCPC Satellite Modem nonvolatile EEPROM and does not have to be reconfigured on power-up. The resulting received data and clock signals are sent to the interface assembly. Receive interface clocking can take several forms as explained below. 1.2.3 Modem Bit Rate Timing The Modulator and the Demodulator each have 4 possible sources for their bit rate timing. The Modulator always outputs the Send Timing signal, but the source of this timing may be either: 1.
PSM-500/500L/500LT SCPC Satellite Modem Send Data From Interface Description DATA Send Timing To Interface CLOCK Modulator Terminal Timing Terminal Timing From Interface External Send Timing Input (Rear Panel) External Reference Input (Rear Panel) Internal Reference Oscillator External Reference PLL Modulator bit clock source is selected from "Internal", "Terminal Timing", "External" or "RCV Clock". The Send Timing is always an output from the modem.
Description PSM-500/500L/500LT SCPC Satellite Modem 1.2.4 Control Processor A single microprocessor manages all monitor, control and communications functions on the modem board. The processor continuously monitors all onboard status signals. The modem control processor uses external address and data buses to connect to external Flash PROM containing the instruction code.
PSM-500/500L/500LT SCPC Satellite Modem Description 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. The interface standard is electronically selectable via front panel or remote control. Optional interfaces are provided by a separate option interface card which is mounted inside the modem chassis.
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. The overhead channel is recovered at the far end. This added channel is termed variously an overhead channel, ESC, service channel, “asynch” channel or, in IESS terminology, an ES to ES data channel.
PSM-500/500L/500LT SCPC Satellite Modem 1.2.7.1 Description 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). 1.2.7.1.1 AUPC Control Channel (AUPC) When the modem is placed into either the “Enhanced” or “Custom” modes the AUPC control channel becomes available.
Description PSM-500/500L/500LT SCPC Satellite Modem error correction. For example, the common rate ½ means that for every data bit two bits are transmitted, and in rate 5/6, 6 bits are transmitted for every 5 data bits. Better performance is commonly considered higher coding gain at a given rate. There are always other factors to consider, such as the latency (processing time) required, time to recover from a synch loss, signal acquisition time, etc, etc.
PSM-500/500L/500LT SCPC Satellite Modem Description 1. The TPC M5 Full, Short and Legacy modes are intended for PSM-4900 Compatibility only 2. * TPC 4k/16k restrictions apply to that line and Code Rate only 3. TPC4k Max data rate limits see below 4. TPC16k operates up to 20 Mbps depending on Feature Set and modulation 5. The Viterbi, Rate 3/4 & 7/8, 16QAM CT modes are only for Comtech modem compatibility as they only operate in this mode with R-S at 220, 200, depth of 4. R-S is auto-enabled 6.
Description PSM-500/500L/500LT SCPC Satellite Modem 1.2.8.0 Special Codec CT Modes The wide range of FECs available today and the possibility of many different operating modes and parameters for each can make compatibility with other brands of modems extremely difficult. To aid in FEC compatibility with other brands of modems, the PSM-500 series offers special “CT” modes, standing for “Competing Technology”. These modes use the same parameter settings as popular modems by other manufacturers.
PSM-500/500L/500LT SCPC Satellite Modem Description Transmit Data Channel Control Transmit Reed-Solomon Block Encoder & Synchronous Scrambler Transmit Reed-Solomon Block Interleaver Clock Transmit Terrestrial Data Channel XMT IBS Multiplex Option Processor Clock and Frame Generation Clocks Main Modem Assembly Clock Control RCV Receive Terrestrial Data Channel FIFO From Main Modem Receive Reed-Solomon Block Decoder & Synchronous Descrambler Receive Data Channel Receive Reed-Solomon Block De
Description Mode PSM-500/500L/500LT SCPC Satellite Modem Compatibility Terrestrial Data Rate Overhead Ratio n, k and depth Values Disabled N/A 1/1 IESS-308 IESS-308 1.2 kbps to <1.544 Mbps 9/8 126, 112, 4 (M4 modem compatible) IESS-308 1.544 Mbps to <2.048 Mbps 45/41 225, 205, 4 IESS-308 >2.
PSM-500/500L/500LT SCPC Satellite Modem Description 1.2.9 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.
PSM-500/500L/500LT SCPC Satellite Modem Installation Chapter 2 - Installation 2.0 Installation Requirements The PSM-500 VSAT/SCPC Modem is designed for installation in any standard 19-inch equipment cabinet or rack, and requires 1 RU mounting space (1.75 inches) vertically and 12 inches of depth. 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.
Installation PSM-500/500L/500LT SCPC Satellite Modem providing a 1 RU space for airflow. Modem units should not be placed immediately above a high heat or EMF generator to ensure the output signal integrity and proper receive operation. Do not mount the PSM-500 in an unprotected outdoor location where there is direct contact with rain, snow, wind or sun. The modem is designed for indoor applications only.
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 – 1750 MHz Programmable +3 to –35 dBm output at 50Ω. BUC Power Source (normally 24VDC @ <4A) to be output on this connector. Various supplies are available and all are connected to the 5 pin DIN connector at J10.
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.
PSM-500/500L/500LT - Rev. 0.91 J1 S1 J1 S1 Normally Blank, Used with Option Interface. 90 - 260 VAC, 50 W. J2 AC Line Normally Blank, Used with Option Interface. 90 - 260 VAC, 50 W. J2 AC Line Control J6 37 Pin "D" Connector J3 Data Interface USB J5 Alarm J10 EXT. REF IN J7 AUX J4 Control J6 USB J10 J8 ! BUC PWR Status XMT IF OUT J9 RCV IF IN MADE IN U.S.A. MADE IN U.S.A. RCV IF IN J9 CAUTION! Hazardous Voltage May Be Present on J8/J9 XMT IF OUT J8 DC Only, 60V, 6A Max EXT.
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.
PSM-500/500L/500LT SCPC Satellite Modem Installation Table 2–1 Data Interface Connector J3 Pin Assignment by Signal Modem Pin # RS–449 Signal Name 28 Demod Fault Alarm *(2) 32 V.35, V.
Installation PSM-500/500L/500LT SCPC Satellite Modem Table 2–2.
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; for example a multiplexer option would present overhead channel and analog channel inputs at this connector.
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.
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. Physically install both units to be paired and connect the IF transmit and receive coaxial cables and data cables to both units. The special data “Y” cable is connected between the redundant pair.
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.
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 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. To set any parameter: 1. Select the functional matrix by choosing one of the four function keys; Unit, Mod, Dem and Int’f. 2.
Installation PSM-500/500L/500LT SCPC Satellite Modem 2.7 Self-Test Mode ⇒ CAUTION: The Self-Test Mode will disconnect the transmit and receive IF from the ground station equipment and will therefore disrupt any traffic currently through the PSM500 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.
PSM-500/500L/500LT SCPC Satellite Modem Installation “2047” pattern or “2” for a “2^23-1” pattern. The “0” key will disable the BER test mode. BERT test readings are displayed in the parameter and the 6 items below it. Since there is no noise added in the IF Loop-back mode the BER results should show no errors. This test is more useful once the modem is configured and a Loop-back over the satellite is performed by setting the receive frequency to that output by the modulator.
Installation PSM-500/500L/500LT SCPC Satellite Modem 2. The L-Band modems with L-Band Receive can be set to supply power at either 13 or 18 VDC and/or a 10 MHz reference signal on the receive input connector for coupling to the LNB via the receive cable. 2.9.1.1 IBS Multiplexer and Reed-Solomon Selection The PSM-500 Modem contains on-board circuitry implementing either an IBS Multiplexer or a Reed-Solomon concatenated FEC capability independently.
PSM-500/500L/500LT SCPC Satellite Modem Installation enable this feature simply supply the parameter with a value other than “0”. When the value set here is equal to the BUC’s LO frequency then the modem can automatically compute the RF frequency at the BUC output. The PSM-500L modem will also determine if the LO is high or low side and sets the spectrum so that it is always “Normal”, i.e. not inverted.
Installation PSM-500/500L/500LT SCPC Satellite Modem The hybrid “Auto Narrow” and “Auto Track” modes available in previous generations of this modem are no longer available as separate entries. The “Auto Narrow” function of initially searching in a smaller acquisition range is incorporated into the latest version of the “Search” mode. Setting the “Search” mode also enables a new menu item for “Sweep Time”. To be enabled the is set to a value other than 0 Seconds.
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 PSM500, the following sample configuration is representative of the required procedures: For easier entry we can first set the entry mode to “Quick”. Go to and set the “Quick” mode. This is the default setting.
Installation PSM-500/500L/500LT SCPC Satellite Modem Once all parameters have been set and verified, the transmit output can be connected to the ground station equipment for transmission to the satellite. Verify that the alarms are extinguished and that the demodulator has locked. 2.9.4 Setting Additional Parameters As stated before, the basic parameter settings are essential to achieve modem operation and carrier lock.
PSM-500/500L/500LT SCPC Satellite Modem Individual Alarms Installation Processing Matrix Outputs Summary Alarm Unit Alarms Reference Test Active Hardware Alarm Relay A Modulator Alarms Alarm Relay B Carrier Bit Clock Test Active Hardware No Data Selection Logic Demodulator Alarms Carrier Lock Low Level Low Eb/No Test Active Hardware No Data Modulator Alarm NC NO C NC NO C Front Panel Data Interface Interface Alarms BER Loss Test Active Option Fail Demodulato r Alarm Front Panel Data Interfac
Installation PSM-500/500L/500LT SCPC Satellite Modem 6. Modulator AUPC Alarm. 7. Modulator Test Active. 8. Modulator Hardware Fault. 9. Demodulator Signal Lock. 10. Receive Input Level below AGC range. 11. Receive Low Eb/No below threshold. 12. Demod Test Active. 13. Demodulator Hardware Fault. 14. Interface Test mode Active. 15. Interface BER Test Sync Loss. 16. Backward Alarm from IBS multiplexer (if equipped).
PSM-500/500L/500LT SCPC Satellite Modem Installation Manual tuning of the modem’s reference is accomplished using the parameter and entering a value from –127 to +127 Automatic calibration of the modem’s internal reference is accomplished by inserting a known high accuracy reference at the rear panel “External Reference” input and enabling the item. The calibration should take several seconds and will indicate a successful completion.
Installation PSM-500/500L/500LT SCPC Satellite Modem 2.9.7 Setting the Modem Address for Command Mode Operation If Command Mode Binary Packet Operation is desired the modem packet “address” must be set via the front panel before the modem will recognize packets. To set the address use the arrow keys to go to the parameter and press “Edit”, then use the numeric keypad to enter the address from 0 to 255. Then press the “Enter” key to enable the change.
PSM-500/500L/500LT SCPC Satellite Modem Installation When the unit is powered-up again the main modem processor will automatically query the new interface card and determine the type and options installed. The SnIP Ethernet interface and the HSSI interface may be installed alone or together. In the latter case the two interfaces are “stacked” and a special ribbon cable is available for this configuration to connect to the internal modem interface.
Installation PSM-500/500L/500LT SCPC Satellite Modem provides additional front panel and remote control parameter settings allowing control of the option. The modem’s two FEC slots are identical, and if similar functions exist on two cards the modem will select a requested FEC option from the first slot which has that capability 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.
PSM-500/500L/500LT SCPC Satellite Modem Installation Rear Panel J3 and J4 Connectors Interface Option Connector Top View M500 Series Main PCB Latches FEC Card DRA05-002 FEC Slot A FEC Slot B Flash FPGA TPC4k TPC16k Side View Showing Insertion Slot B must be empty to install in Slot A Main PCB Figure 2-5 PSM-500/500L/500LT - Rev. 0.
PSM-500/500L/500LT SCPC Satellite Modem Operation Chapter 3 - Operation 3.1 Operating Procedures Operation of the PSM-500 Modem consists of controlling the unit’s operating parameters and monitoring status and responses via one of the control interfaces. There are three possible control methods for the modem: 1. Front Panel Keypad Control. (Section 3.1.1) 2. Terminal Mode Control via rear panel 232/485 or USB control ports. (Section 3.3) 3.
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”. The “Enter” key on the lower right is normally blue while the rest of the numeric keypad keys are gray. This allows easy identification of the Enter key.
PSM-500/500L/500LT - Rev. 0.91 PSM500 Satellite Modem SYSTEMS DATUM Int'f Dem Mod no 0 . +/- yes 1 4 7 2 5 8 3 6 9 Figure 3-1 PSM-500 Front Panel Controls and Indicators IF Frequency 70.
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. The LED colors maintain a consistent meaning.
PSM-500/500L/500LT SCPC Satellite Modem Operation 3.1.3 Guide to Front Panel Monitor and Control The front panel can be used to perform complete monitor and control of the modem setup and operating parameters. The operation of the front panel should be intuitive after very little use to familiarize the user with basic concepts and operations.
Operation PSM-500/500L/500LT SCPC Satellite Modem manual as . We may also show selection of a specific value for the parameter using the notation = 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.
PSM-500/500L/500LT SCPC Satellite Modem Operation The current input can be canceled by pressing the “Clear” key at any time before pressing “Enter”. Failure to press a key for approximately 60 seconds results in automatic canceling of the current entry and return of the display to the current setting. Selection entries may be accomplished by one of the following: • When a selection entry parameter is displayed, simply press the “Edit” key followed by a digit key 0, 1, 2, 3 or 4.
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. The tables below are organized with general “Rules of Thumb” which aid navigation. 1.
PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-1 PSM-500 Front Panel Parameter Matrix – Unit Sheet Status Modem Redundcy Mode Config Keybrd Remote USB Ref Monitor Test Modem Mode Mode Mode Source Reference SW Rqst Recall Entry Protocol Activity Frequency Full OCXO Oven Cal Ref Redundcy SW Hold Store LCD Actve Address Fine Tune Zero Tst Active Update ROM Unit ID Backup Restore 1 LCD Idle Rate Mode Alarm Reference Modem Hardware Ref AFC Beep SysClk AFC Model
PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-2 PSM-500 Front Panel Parameter Matrix – Modulator Sheet Status IF Data Mux BUC Power Alarm CXR Test CXR Frequency Bit Rate Mode Modulation Data Offset Fec ESC Overhead Voltage Out Data Clock Level FEC Options MCC Overhead Voltage Min Clock Clock Error Test Output Code Rate OverHd Ratio Current Out AUPC CXR ALC Modulation RS Mode ESC Port Current Max Tst Active LO AFC Spectrum RS (n) ESC Rate Current Min Hardware Fi
PSM-500/500L/500LT SCPC Satellite Modem Operation LNB column is only available on Land LT models. Sweep Time is only visible if Sweep Mode is set to “Search”. 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.
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. Parameters can also be added as new options are installed. Table 3-5.
PSM-500/500L/500LT SCPC Satellite Modem Operation Unit Parameter Detail Representation Redundcy Sw Hold .5 Sec Type Entry Description Numeric 0.0 to 600.0 seconds in 0.1 second increments. Sets the minimum time that a redundancy alarm must last before switching occurs. Redundcy Backup Idle Selection Backup Status or Press “0” or “Edit” then “Enter” to transfer current configuration to backup. View status of or configure backup. Only available when on-line.
Operation PSM-500/500L/500LT SCPC Satellite Modem Unit Parameter Detail Representation Remote Protocol Binary Packet Type Entry Description Selection 0 = VT100, 1 = Quiet VT100, 2 = Binary Packet, Remote control mode type Remote Numeric 0 to 255 0 = address disabled 255 = global Address used to access this unit via remote control and USB packets. Remote Rate 19200bps Selection 0 to 7 selects 300 to 38,400 bits per second.
PSM-500/500L/500LT SCPC Satellite Modem Operation Unit Parameter Detail Representation Alarm Reference To Alarm A Type Entry Description Selection 0=None, 1=A, 2=B, 3=A&B, 4 = Mute CXR, 5 = Mute & Alarm A, 6 = Mute & Alarm B, 7 = Mute & Alarm A & B Selects destination and action taken for reference oscillator alarm types.
Operation PSM-500/500L/500LT SCPC Satellite Modem Table 3-6. Modulator Parameter Detail Modulator Parameter Detail Representation Status CXR Sending, OK Status Data NO DATA Status Clock Internal, OK Type Entry Description Read Only Read Only Modulator Carrier Status Read Only Read Only Modulator Input Data Status Read Only Read Only Modulator Bit Rate Clock Status Status Test Normal Read Only Read Only Modulator Test Status IF Frequency 70.000000MHz Numeric 50.000 000 to 90.
PSM-500/500L/500LT SCPC Satellite Modem Operation Modulator Parameter Detail Representation Data Bit Rate 2.100000Mbps Type Entry Description Numeric 1.200 to 20,000.000 kbps in 1 bps resolution. Entered in kbps to 1bps increments. Modulator Bit Rate – The max and min are determined by settings and options. Data FEC Selection 0 – None 1 = Viterbi, 2 = TCM (8PSK only) 3 = TPC Short 4 = TPC (Legacy) 5 = TPC (CT) TPC Encoder - Only available if installed. Reed-Solomon is enabled below.
Operation PSM-500/500L/500LT SCPC Satellite Modem Modulator Parameter Detail Representation Mux Mode IBS Custom Type Entry Description Selection 0 = Disabled, 1 = IBS Standard, 2 = IBS Enhanced 3 = IBS Custom Enables Multiplexer to specified mode. Enable makes other menu selection below visible. »Mux ESC Overhead 9600 bps Selection 0 = Disable 1 to 7 selects standard rates 300 bps – 38.4 kbps Only in Custom Mode. Selects framing resources committed to ESC Comm.
PSM-500/500L/500LT SCPC Satellite Modem Operation Modulator Parameter Detail Representation Alarm Carrier To Alarm A Type Entry Description Selection 0 = Mute CXR, 1 = Mute & Alarm A, 2 = Mute & Alarm B, 3 = Mute & Alarm A & B Selects destination of alarm Alarm Data To Alarm A Selection 0=None, 1=A, 2=B, 3=A & B Selects destination of alarm Alarm Clock To Alarm A Selection 0=None, 1=A, 2=B, 3=A & B, 4=Send All ones.
Operation PSM-500/500L/500LT SCPC Satellite Modem Table 3-7. Demodulator Parameter Detail Demodulator Parameter Detail Representation Status Carrier Locked, OK Type Entry Description Read Only N/A Demodulator receive Carrier Status Status Eb/No 4.7dB Read Only Measured by internal circuitry. Measured Eb/No Status Offset –8.031kHz Numeric Within +/– Narrow Acquisition Range Receive carrier offset frequency. An entry will reset to 0 after search time has elapsed. Status Level –52.
PSM-500/500L/500LT SCPC Satellite Modem Operation Demodulator Parameter Detail Representation Eb/No Alm 2.0dB Type Entry Description Numeric 1.0 to 20.0 dBm in 0.1 dB increments A receive Eb/No level at or below this level will produce an alarm. IF Low Level Alm -65.5dBm Numeric -26 to –85 dBm in 0.1 dB increments. Dependent on Bit Rate. A receive carrier level at or below this level will produce an alarm. IF Impedance 50 Ohm Selection 0 = 50Ω, 1 = 75Ω Receive IF impedance.
Operation PSM-500/500L/500LT SCPC Satellite Modem Demodulator Parameter Detail Representation Data Descrambler Auto Type Entry Description Selection 0 = Disable, 1 = Auto 2 = V.35, 3 = Intelsat, , 4 = Alt V.35, 5 = Alt. Intelsat 6 = EFD 7 = TPC Sync Scrambler types. Types are added if optional hardware is installed. The Auto mode uses IESS 308 & 309 standards to automatically switch to use synchronous scramblers part of R-S and TPC.
PSM-500/500L/500LT SCPC Satellite Modem Operation Demodulator Parameter Detail Representation LNB Power +18V LNB LNB Current Out 221mA Current Max 300mA Type Entry Description Selection 0 = Disabled 1 = +13VDC 2 = +18VDC Selects Power and Voltage to an LNB in the 500L or LT Numeric Read Only Displays Current draw of LNB Numeric 0 to 500 mA Sets the maximum LNB current before an alarm. LNB Current Min 150mA A Numeric 0 to 500 mA Sets the minimum LNB current before an alarm.
Operation PSM-500/500L/500LT SCPC Satellite Modem Demodulator Parameter Detail Representation Test LO AFC +8.8V Test Step AFC +9.4V Test IDcOff -0.1V Test QDcOff -0.1V Page 3-24 Type Entry Description Read Only N/A Internal Loop Voltage Read Only N/A Internal Loop Voltage Read Only N/A Internal Loop Voltage. I channel DC offset Read Only N/A Internal Loop Voltage. Q channel DC offset PSM-500/500L/500LT - Rev. 0.
PSM-500/500L/500LT SCPC Satellite Modem Operation Table 3-8. Interface Parameter Detail Interface Parameter Detail Representation Status I/O Online Status RTS Off Status CTS On Status DCD On Status DTR Off Status DSR Off Status Test Mod BER Status BER 0.0 E-7 Status Sync Loss 3 Status Errors 7 Status Bits 1.45 E7 Status EFS 99.
Operation PSM-500/500L/500LT SCPC Satellite Modem Interface Parameter Detail Representation I/O DSR Normal I/O Xmt Data Normal I/O Xmt Clock Normal I/O Rcv Data Normal I/O Rcv Clock Normal I/O RTS Monitor Normal Type Entry Description Selection 0 = Normal, 1 = Force Active Interface DSR line control Selection 0 = Normal, 1 = Inverted Transmit Data Inversion Selection 0 = Normal, 1 = Inverted, 2 = Auto Transmit Clock Phase. Auto is now default standard.
PSM-500/500L/500LT SCPC Satellite Modem • • • Operation ”SnIP FAILURE”, Meaning no communications from SnIP card to modem processor. “SnIP HARD RESET”, Meaning that the SnIP is in process of resetting its parameters. “SnIP LIMIT ALARM”, Meaning that the SnIP is not able to process data. The front panel controls for the SDMS are normally only used for basic initial setup. When more sophisticated software is loaded into the SDMS control is usually via the Ethernet connection. 3.
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. Figure 3-2a. Terminal Mode – Example of Unit Status Screen Assuming that we wanted to view another of the Unit column screens.
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 Unit Test A) Modem BER Test B) Cal Ref Disabled Ref AFC +1.1V SysClk AFC +9.3V +3.3V Power +3.3V +5.0V Power +5.0V +12.0V Power +12.0V +21.0V Power +20.8V -12.0V Power -12.
Operation 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.
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. Other failure modes are displayed on the front panel LCD.
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 parameter the parameter entry allows (and requires) entry of transmit frequency at the actual satellite uplink RF frequency.
PSM-500/500L/500LT SCPC Satellite Modem Operation 3.7.2 SCPC Mode Independent – Each station of two linked SCPC modems is considered independent. The transmit data clock is either an input to or output from each station modulator. The other station receive data clock maintains this synchronization. The clocking in each direction is independent and follows the same transmit to receive synchronization.
Operation PSM-500/500L/500LT SCPC Satellite Modem Eb/No on the front panel of 7.5 dB, and is currently outputting –15 dBm. Next it begins raining at location “B”, and the Eb/No drops to –7.0 then –6.8 dB. Modem “B” is constantly sending update messages to “A” and reports the current Eb/No. When “A” sees the drop in Eb/No, it slowly begins to raise the output power, and raises it again when it sees further drops.
PSM-500/500L/500LT SCPC Satellite Modem Operation Site A AUPC Setup 4. Set the A Demodulator Multiplexer to Custom mode (or match the B setup above). 5. If not using the ESC channel for some other reason then set the ESC Overhead to “Disabled”. 6. Set the MCC Overhead Rate to match that set for Site A above e.g. 1200 bps. [ The link should now be working again from B to A. ] 7. Set the Modulator IF AUPC to “Enabled. 8. Set the Modulator IF AUPC Eb/No to that desired, e.g. 7.0 dB. 9.
Operation PSM-500/500L/500LT SCPC Satellite Modem 3. External FIFO Clock – (Option 2) This option allows a station-derived standard clock rate to be used to clock data out of the FIFO. The externally supplied clock must be equal to the average receive data rate. 4. Modulator Clock – (Option 3) Uses the modulator data rate clock as the output clock and obviously requires that the modulator and demodulator data rate be identical.
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. • Advantage – The single point failure of the switch in a classic 1:1 redundancy scheme is eliminated.
Operation PSM-500/500L/500LT SCPC Satellite Modem programmable itself. For most applications though the default “On Any Alarm” is a preferred selection. • 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. The value could be set to zero, but this is not advised. A nominal value of 0.5 seconds insures that intermittent cases do not cause undue switching.
PSM-500/500L/500LT SCPC Satellite Modem Operation 3.10.3 Removal and Replacement of Units in Redundancy Mode It may be necessary to remove a unit of a redundant pair and replace that unit with another. The following method performs that function with the minimum disruption to the traffic status. In overview the procedure is to: 1. Force a switch away from the unit to be removed (if it is currently on-line), 2. Disconnection of cables from the now off-line unit, and 3. Physical removal of the unit.
Operation PSM-500/500L/500LT SCPC Satellite Modem The analog output presented at the rear panel Alarm connector J5 has a 1kΩ output impedance, protecting the driver circuitry from shorts. 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.
PSM-500/500L/500LT SCPC Satellite Modem Operation Caution – What is not immediately obvious is that the time set is the time of the “current” configuration with no carrier before switching to that configuration. Thus if configuration #1 is set to 12 seconds and #4 is set to 2 seconds (all others being set to zero) then when on #4 for 12 seconds with no receive carrier the modem will change to #1, and when on #1 for 2 seconds with no receive carrier then the modem changes to configuration #4.
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” command. Transmission continues with data bytes placed after the preamble. 4.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance Chapter 4 - Maintenance 4.0 Periodic Maintenance The PSM-500 requires no mandatory periodic field maintenance procedures. The unit contains no adjustments and most calibration is digital and held in EEPROM. Should a unit be suspected of a defect in field operations after all interface signals are verified the proper procedure is to replace the unit with another known working modem.
Maintenance PSM-500/500L/500LT SCPC Satellite Modem transmit a data signal at one end of the link and sequentially set each of the loop-back options. Proper reception of the loop-back data verifies all components between the source and the loop. The simplified diagram below shows the location of the PSM-500’s built in loop-back functions within the link from one end of a link to the other.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance and provide that signal to the BERT for synchronization. More information on using the PSM500’s internal BERT is given below. 4.1.2 Using the Built-in BERT The PSM-500 contains a complete transmit and receive Bit Error Rate Test (BERT) set. Each direction is independent and can be used for either loop-back testing or uni-directional testing with another PSM-500 on the other end of the link.
Maintenance PSM-500/500L/500LT SCPC Satellite Modem All of these settings and test results are also available via the remote control interface, allowing for automated and periodic testing of units not in service. 4.2 Troubleshooting The following is a list of possible problems that could be caused by failures of the modem or improper setup and configuration for the type of service. The list is arranged by possible symptoms exhibited by the modem.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance polarization, intermodulation products. Most of these cases can more easily be determined with a spectrum analyzer. If possible move to another operating frequency to see if that resolves the problem. Symptom: The Modem acquires a carrier but loses lock intermittently. Possible Cause: Receive acquisition range set too narrow.
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. Possible Cause: Receive signal or clock inverted.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance 4.2.2 Onboard Processor Power-On Sequence and Diagnostics The processor goes through the following sequence every time the modem is powered up. 1. Sets up the stack pointer and initializes the register bank; 2. Disables all interrupts; 3. All internal RAM and all external RAM is tested by writing to it and reading from it.
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 – check the web site for the latest: A.
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. Currently the name of the control program is “M500 Update.exe”.
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.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance The M500 Flash Update program gives feedback to the user during the update process. If you suspect that something is not going correctly with the update process then wait until the current process is completed and contact Datum Systems via email with details of what is observed. We have tried very hard to make the program as robust as possible. There are two types of software/firmware files that may be uploaded to the modem.
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. 4.
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. PSM-500/500L/500LT - Rev. 0.
Maintenance 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. Refer to Section 1.1.2. which shows the capabilities of each standard feature set.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance 4.5 Frequently Asked Questions - FAQ OR How Do I?, Why Doesn’t It?, and Where Is? This Section is intended to form a smart index pointing to proper sections of the manual with information on performing common actions or answering common questions. The presentation here is divided into 5 common areas – Link Setup, Front Panel, Remote Control, Data Interface and Manual. A. Link Set Up and Installation. A.1 Compatibility with other Modems.
Maintenance PSM-500/500L/500LT SCPC Satellite Modem My PSM-500 and PSM-2100 do not agree on the Eb/No parameter with Reed-Solomon Codec installed? The PSM-2100 was designed before Intelsat IESS 309 added the section defining how the Eb/No was measured with Reed-Solomon concatenated coding, and uses a different method. The method is encapsulated in ASIC and not changeable. Unfortunately the IESS lists two possible methods of computing the Eb/No with Reed-Solomon.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance link. If after insuring that all parameters are set the same and that the acquisition range is correct and that there are no interfering carriers; one other method is to take both modems back to the factory default condition and rebuild the configuration from “scratch”. Use the front panel and select option “0” or “Factory”. You may want to save your current configuration before resetting to the default.
Maintenance PSM-500/500L/500LT SCPC Satellite Modem How do I determine the transmitted "Symbol Rate" of the modem? This particular parameter used to be a lot simpler to define. With the introduction of Turbo Product Codes coupled with all the other modem modes and options like programmable IBS multiplexer data load it is now extremely hard to define. The modem knows though, and it is available at the front panel parameter showing the current transmit/receive symbol rate.
PSM-500/500L/500LT SCPC Satellite Modem Maintenance Manual will always turn the carrier off after a change. This option is set in . More directly the setting described is probably set to “Manual” mute mode. Why can’t I find or see a certain option parameter that is shown in the tables? Many parameters are only available when another option has been enabled which requires that parameter.
Maintenance PSM-500/500L/500LT SCPC Satellite Modem impossible. However the PSM-500 actually contains both its own and a copy of the PSM-4900 protocol, allowing the PSM-500 to accept and respond to PSM-4900 packets within the limitations of the PSM-4900 capabilities. This allows mixed systems of 4900 and 500 series modems without initially changing control software. The compatibility does not currently extend to operation over the link on the MCC channel.
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. First is the parameter which selects whether a switch is requested on all alarms, alarm A and/or alarm B.
Maintenance Abbreviation Keybrd LCD LDPC & FLDPC LNB LO Loopbck Lvl Max MCC Min Mod Mux Opt OverHd RCV, Rcv Redundcy Ref Rqst RS, R-S Sat SCPC SER SnIP SW, Sw Sync SysClk Ter, Terr TPC Tst USB VSAT XMT, Xmt Page 4-22 PSM-500/500L/500LT SCPC Satellite Modem Full Text Keyboard Liquid Crystal Display (Flexible) Low Density Parity Check FEC Low Noise Block downconverter Local Oscillator Loop-back Level Maximum Modem Control Channel Minimum Modulator Multiplexer Option Overhead Receive, into the Demodulator
