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PSM-500/500L/500LT SCPC Satellite Modem

Description

PSM-500/500L/500LT - Rev. 0.91

Page 1-19

Transmit Reed-Solomon

Block Encoder &

Synchronous Scrambler

Processor

Transmit

Terrestrial Data

Channel

Receive

Terrestrial Data

Channel

Transmit

Data Channel

Receive Data

Channel

Cont

rol

XMT

Clock and Frame

Generation

RCV

Cont

rol

Cloc

k

Cloc

k

Main Modem

Assembly

Clocks

Reed-Solomon Codec Simplified Block Diagram

Transmit Reed-Solomon

Block Interleaver

Receive Reed-Solomon

Block Decoder &

Synchronous

Descrambler

Receive Reed-Solomon

Block De-Interleaver

FIFO From

Main Modem

IBS

Multiplex

Option

The Reed-Solomon modes shown available below can be selected from the front panel or remote
control. The CT220,200 mode is a special compatibility mode and is automatically set by certain CT
FEC modes, for example when Viterbi, Rate ¾ is selected when in 16QAM mode. It can be over-
ridden by choice from the Reed-Solomon parameter.

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Содержание PSM-500

Страница 1: ...M500 VSAT SCPC Satellite Modem PSM 500 PSM 500L 500LT Installation and Operation Manual Revision 0 91 ...

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Страница 3: ...CPC Point to Point Links 1 4 1 1 3 2 SCPC Point to Multi Point Links in a Broadcast Application 1 4 1 1 3 3 DAMA Demand Assigned Multiple Access 1 5 1 1 3 4 TDMA Time Division Multiple Access Remote Site Application 1 5 1 2 Modem Functional Assemblies 1 6 Figure 1 2 Modem Block Diagram 1 7 1 2 1 Modulator 1 8 1 2 2 Demodulator 1 9 1 2 3 Modem Bit Rate Timing 1 10 Figure 1 3 Clock Source Options 1 ...

Страница 4: ... 2 1 2 1 1 Removal and Assembly 2 1 2 2 Mounting Considerations 2 1 2 3 Modem Connections 2 2 Figure 2 1 Modem Rear Panel 2 5 2 3 1 Data Interface Pin Connections 2 6 Table 2 1 Data Interface Connector J3 Pin Assignment by Signal 2 6 2 3 1 1 Connecting the Data Interface to Other Equipment 2 7 2 3 2 Remote Control Connection 2 7 Table 2 2 Remote Control Connector J6 Pin Assignment 2 8 2 3 3 Alarm ...

Страница 5: ...3 Using The L Band PSM 500L Transmit RF Frequency Feature 2 16 2 9 1 4 Using The L Band L Receive RF Frequency Feature 2 17 2 9 2 Carrier Acquisition Parameters 2 17 2 9 2 1 Initial Acquisition 2 18 2 9 2 2 Carrier Re acquisition 2 18 2 9 3 Sample Configuration Setting 2 19 2 9 4 Setting Additional Parameters 2 20 2 9 4 1 Data Interface Compatibility 2 20 2 9 4 2 Automatic Correction 2 20 2 9 4 3 ...

Страница 6: ...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 Modem Unit Parameter Detail 3 12 Table 3 6 Modulator Parameter Detail 3 16 Table 3 7 Demodulator Parameter Detail 3 20 Table 3 8 Interface Parameter Detail 3 25 3 3 Terminal Mode Con...

Страница 7: ...Mode 3 39 3 11 Bit Error Rate Test BERT Set Operation 3 39 3 12 Analog Monitor Output Operation 3 39 3 13 Storing and Recalling Configuration 3 40 3 14 Automatic Configuration Recovery ACR 3 40 3 15 Special Control Mechanisms 3 41 3 15 1 Power Up Behavior 3 41 3 15 2 Monitors and Outputs 3 41 3 16 Burst Mode Operation 3 41 Chapter 4 Maintenance 4 1 4 0 Periodic Maintenance 4 1 4 0 1 Internal Refer...

Страница 8: ...9 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 Turbo Product Codes FEC Addendum TPC 1 Appendix HSSI High Speed Serial Interface Addendum HSSI 1 Appendix SNIP SnIP Ethernet Interface Addendum SNIP 1 Append...

Страница 9: ... the rear of the modem should be connected to a good earth ground with low impedance cable in rack installations The modem is supplied with an IEC filtered power inlet module designed to accept a 3 wire mains connection consisting of an earth ground neutral and line conductors The mating power cord should have a line cord and plug suitable for the country of operation EMC Notice This equipment has...

Страница 10: ...tional FEC modes and corrections Requires minimum Modem Software Revision 0 26 Revision 0 86 8 12 2007 Includes additional FEC modes corrections and new menu features for Unit Configuration RTS Monitor and Transmit Mute Requires minimum Modem Software Revision 0 52 Revision 0 87 1 10 2008 Includes added Advanced TPC modes and corrections Requires minimum Modem Software Revision 0 63 Revision 0 88 ...

Страница 11: ...ance improvement over previous modems at reduced cost The PSM 500LT is the third providing an integrated BUC power supply The modem is designed for service in varied types of satellite systems Either SCPC systems where two modems are set for continuous operation with each other or shared resource systems where modem carriers are not continuous in nature such as DAMA networks where outgoing signals...

Страница 12: ... with both this modem s operation and this manual There are some significant differences you should review in the list below New in This Modem The PSM 500 series is the first to include 8PSK 8QAM and 16QAM modulation modes requiring new procedures and remote control interaction The PSM 500 now includes remote control and firmware update via USB interface on the rear panel This was especially neces...

Страница 13: ...dem are also shown More detail on maximum and minimum data rates are shown in Appendix A PSM 500 Series Feature and Option Matrix Original M5 PSM 500S N L LT Series Feature PSM 4900 M505 M511 M523 Modulation BPSK QPSK OQPSK N A 8PSK QAM N A Upgrade 16QAM APSK N A Upgrade Upgrade Max Data Rate M523 rates slightly higher at higher FEC rates See Notes below BPSK 2 46 Mbps 2 5 Mbps 5 Mbps 7 38 Mbps QP...

Страница 14: ... This consistent performance plus advanced technology such as TPC results in the absolute minimum power requirements which equates to the minimum operating Ku Band satellite systems are subject to changing performance due to rain at one or more sites The PSM 500 contains built in software to perform Automatic Uplink Power Control AUPC If the modems at each link end are provided with an external as...

Страница 15: ... go through the hub The resulting delay through 2 satellite hops is just at the limit of what is tolerable for voice traffic In this application a new network configuration is usable That is a Mesh network where any of the voice modems at any site can be programmed to link with any other modem directly at any other site The resulting link diagram looks like a mesh of interconnects Now there must b...

Страница 16: ...nal Processor Acquisition subsystem 5 The Programmable Data Interface Seven standard data interfaces are built onto the main modem assembly The unit can also accept special interfaces via an optional interface card The other two printed circuit assemblies are the Front Panel Control Assembly and the Power Supply Assembly In addition the main PWB can accept two plug in sub assemblies for Forward Er...

Страница 17: ...le Receive Interface DB37 Female at J3 RS 449 or V 35 or RS 232 etc RClk RData Ready Option Interface Connector P1 Ext FIFO Clk XMT Out 70 MHz or L Band Figure M500 Modem Block Diagram FEC Decoder Baseband Signal Processing Demodulator V 35 Intelsat and Differential Decoder Front end AGC Amp A D Conversion Receive Synthesizer RCV In 70 MHz or L Band Out Clk In Clk Modem Reference Oscillator MODULA...

Страница 18: ... is applied to the D A output to reduce the level of sampling components Transmit Local Oscillator generation is accomplished in two parts A PLL step synthesizer is used to generate a basic LO in the 52 to 92 or 104 to 184 or 952 to 1752 MHz range with 500 kHz step size A Direct Digital Synthesizer DDS consisting of an NCO and D A conversion is used to generate an approximate 2 MHz signal with fin...

Страница 19: ...teps of 500 kHz and a Direct Digital Synthesizer DDS component used to acquire and track the received carrier The DDS control has two tuning sources 1 the digital Costas demodulation loop phase detector used to track an already locked signal and 2 the processor control used to set the carrier frequency and acquire new signals The processor controls the acquisition search over a programmable range ...

Страница 20: ...ive timing If the system requires a different clock which still must be the same average rate as the demodulator s receive clock then provisions are made to buffer the data in a programmable FIFO The demodulator receive clock is always used to clock the data into the FIFO The clock output can be either 1 The Demodulator Receive Clock 2 The Modulator Clock 3 An internally generated bit rate NCO loc...

Страница 21: ...ed from RCV Clock Internal External or Mod Clock Selection of RCV Clock bypasses the FIFO buffer Bit Rate NCO From Receive Clock Send Data From Interface Send Timing To Interface Modulator bit clock source is selected from Internal Terminal Timing External or RCV Clock The Send Timing is always an output from the modem Receive Data To Interface Receive Timing To Interface External FIFO Clock From ...

Страница 22: ...al device connected to the modem In addition a USB control interface is provided The control processor has provisions for communicating with another PSM 500 modem for implementation of Automatic Uplink Power Control AUPC The channel for this communications is normally provided by equipping the unit with the optional IBS multiplexer interface card 1 2 5 Acquisition Processor The acquisition process...

Страница 23: ...ide More information on use of the loop back modes is given in Section 4 1 Common Test Procedures 1 2 6 2 Data Interface BERT Function The standard interfaces also include a programmable Bit Error Rate Test BERT set It is located between the modem s satellite and terrestrial data loop back functions Ethernet interfaces do not have this function The BERT can be controlled from the front panel or vi...

Страница 24: ...odem Control 2 one bit control channels Also variable data load per frame The ESC Data Channel can be set under software control to either RS 232 or RS 485 mode The pin assignments for both modes are shown in Section 2 3 and Appendix RS These pin assignments appear on the rear panel AUX Auxiliary connector J4 only when the Multiplexer function is enabled The RS 485 Transmit Data Drivers can set to...

Страница 25: ...ecomes available These consist of two single line or one bit control channels that can be used to send control information independently in both directions over the link The input signals on these channels can be either a contact closure or a logic type signals while the output is a form C relay contract set whose state depends on the state of the input signal The low input logic level is 0 to 0 4...

Страница 26: ... It has only been in the past few years that new technologies have emerged which provide more coding gain with reasonable implementations 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 ...

Страница 27: ...PC4k 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 TPC Advanced modes are Datum Systems proprietary implementations that require the TPC16k option only for the colored lines...

Страница 28: ...standard part of the M500 used with 8PSK at rate 2 3 The Viterbi CT option mode follows that of competitive modems for 16QAM operation at rates and 7 8 The CT mode at this setting defaults to selecting Reed Solomon CT mode at n k and depth values of 220 200 depth of 4 and inverts the data This is a closed circuit mode that does not meet normal IESS standards but is necessary in order to link to th...

Страница 29: ...cks Reed Solomon Codec Simplified Block Diagram Transmit Reed Solomon Block Interleaver Receive Reed Solomon Block Decoder Synchronous Descrambler Receive Reed Solomon Block De Interleaver FIFO From Main Modem IBS Multiplex Option The Reed Solomon modes shown available below can be selected from the front panel or remote control The CT220 200 mode is a special compatibility mode and is automatical...

Страница 30: ...ndently The performance improvement achieved by the TPC is significant For example the BER vs Eb No performance of TPC Rate is approximately equal to Rate Viterbi and uses over 40 less bandwidth TPC also provides better bandwidth power utilization than either Reed Solomon concatenated on Viterbi or 8PSK TCM with Reed Solomon The PSM 500 series offers extensive TPC capabilities including both first...

Страница 31: ...ect either SnIP or HSSI interfaces in addition to the standard synchronous serial interfaces both cards can be installed in a stacked configuration Installed option interfaces are automatically recognized by the modem making them a selectable option on the front panel or remote control protocols 1 2 10 Modem Circuit Implementation Much of the functionality in this modem has been achieved by incorp...

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Страница 33: ...6 foot with applicable AC connector 3 Installation and Operation Manual plus other information on CD 2 1 1 Removal and Assembly If using a knife or cutting blade to open the carton exercise caution to ensure that the blade does not extend into the carton but only cuts the tape holding the carton closed Carefully unpack the unit and ensure that all of the above items are in the carton If the Prime ...

Страница 34: ...ctor for all standard or appropriate connector for an optional interface such as G 703 or Ethernet 10 Base T Other optional connections are shown below 2 3 Modem Connections All modem connections are made to labeled connectors located on the rear of the unit The connector definitions below are those on the modem unit Any connection interfacing to the modem must be the appropriate mating connector ...

Страница 35: ...or equipment damage unplug the L Band modem and BUC power supply whenever the transmit cable is disconnected The L Band Modulator PSM 500L Block Up Converter Power Supply at J10 12 to 56 Volts DC up to 6 Amp capability Programmable enable and disable onto the transmit cable at J7 The BUC Power Status LED next to J7 shows the status as follows Red No voltage sensed on DIN input connector or power i...

Страница 36: ...nsmit on pin 4 input to modem RS 232 Receive on pin 6 output from modem RS 232 CTS on pin 7 output from modem RS 232 RTS on pin 9 input to modem RS 232 DSR on pin 11 output from modem RS 232 DTR on pin 12 input to modem RS 232 DCD on pin 13 output from modem RS 485 Connection RS 485 Receive A on pin 11 output from modem RS 485 Receive B on pin 6 output from modem RS 485 Transmit A on pin 12 input ...

Страница 37: ... VAC 50 W MADE IN U S A J5 Alarm J6 AUX J4 J8 CAUTION Hazardous Voltage May Be Present on J8 J9 BUC PWR IN BUC PWR Status J11 DC Only 60V 6A Max Normally Blank Used with Option Interface 37 Pin D Connector J3 Data Interface AC Line XMT IF OUT EXT REF IN RCV IF IN S1 J1 J2 J7 J9 90 260 VAC 50 W MADE IN U S A J5 Alarm AUX J4 70 140 MHz and Hybrid IF Modem L Band IF Modem Control USB USB J6 Control J...

Страница 38: ... ST ST TTSETC A Output 23 Transmit Clock B SCT B ST TSETC B Output 6 Receive Data A RD A RD RD RD A Output 24 Receive Data B RD B RD RD B Output 8 Receive Clock A SCR A RT RT RSETC A Output 26 Receive Clock B SCR B RT RSETC B Output 7 RTS A RTS RTS RTS A Input 25 RTS B RTS B Input 9 CTS A CTS CTS CTS A Output 27 CTS B CTS B Output 11 Data Mode A DSR DCR DCR A Output 29 Data Mode B DCR B Output 12 ...

Страница 39: ...e cables shield at one end of the cable only Connecting at the DCE end only prevents ground loop currents being carried on the shield 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 cont...

Страница 40: ...ys are designated A and B and the particular alarms that are summarized on each relay are programmable from the front panel of the unit or via remote control Connection to the A and B relays is via the proper set of pins as shown in Table 2 5 below and programming the applicable alarm entries via the front panel control or remote control Non Alarm is defined as the powered state of the relay resul...

Страница 41: ...ncy switch It does require specific minimal facilities at the transmit and receive IF signal connections and at the terrestrial data connection These are a combiner at the transmit IF a splitter at the receive IF and a Y cable at the terrestrial data connection With this connection scheme the switching is only performed on the outputs from the modem The modem IF and data inputs are always availabl...

Страница 42: ...he auxiliary RS 232 control port The alarm outputs are also available The other facility provided to aid in these redundancy schemes is the ability to save and recall configuration information Thus a back up modem can obtain and save the configurations from 8 other modems and switch immediately to the necessary parameters to replace any of those units by simply recalling that unit s stored configu...

Страница 43: ...n the two unit s data output drivers possibly conflicting and causing damage During configuration of the primary unit several new parameters will become available after the mode is set to 1 1 In addition to the Unit Redundcy Config parameter of step 4 above there will also be parameters that allow the alarms and timing to be configured for the application The default values for these parameters ar...

Страница 44: ...he Unit Remote Port parameter to RS 232 option 0 The Unit Remote Bit Rate and Format also require setting to match the terminal settings The Unit Remote Address serves no function in the Terminal mode See below for a quick introduction on the use of the front panel and steps for entering parameters 2 5 Modem Control from the Front Panel The front panel can be used to completely control the modem s...

Страница 45: ...er when the option scheme becomes more familiar For instance all options that can be enabled or disabled use 1 to enable and 0 to disable Note that the yes and no below the 1 and 0 key aid this convention Following a valid input the modem will place the new setting into the nonvolatile EEPROM making it available immediately and also automatically the next time the unit is powered on 2 6 Modem Term...

Страница 46: ...station equipment and will therefore disrupt any traffic currently through the PSM 500 under test The transmit output is still active if it was enabled before initiating an IF Loop back This Test Mode should not be used on a live traffic unit The PSM 500 provides a built in IF loop back mode which couples the transmit output to the receive input via physical relays at the modem IF and an internal ...

Страница 47: ... the Modem for Operation The following description assumes that the modem setup is to be done manually at a depot location or in the field via the front panel Alternately the modem could be automatically set up using a controller and the command interface No software is provided for such an external control application and therefore this task is the responsibility of the using organization 2 9 1 S...

Страница 48: ...o IESS 308 or IESS 309 See below for the difference When TPC is enabled but the IBS multiplexer option is not installed or not enabled Auto uses the new Scrambler and Descrambler option 7 TPC Sync this uses a synchronous scrambler specific to the TPC Codec When both TPC and IBS multiplexer are installed and enabled Auto uses the IESS 308 option Remember that the scrambler and descrambler may be se...

Страница 49: ...ires a new Receive IF frequency input to recalculate the proper input frequency setting To return to using the L Band IF frequency setting simply enter a value of 0 into the LNB LO parameter A common LO frequency for the C Band 3 7 to 4 2 GHz Range is 5150 MHz high side LO while a common LO for the Ku Band 11 7 to 12 2 GHz range is 10750 MHz low side LO 2 9 2 Carrier Acquisition Parameters The PSM...

Страница 50: ... is in use such as a block down converter for example the initial acquisition range can be set very wide to allow locking to a carrier well outside the range of standard modems Several cautions are in order here If the acquisition range is set too small and the system offsets drift then a carrier may be locked out of acquisition or lost during operation If the acquisition range is set too wide and...

Страница 51: ... and the decimal point Next scroll down to the Modulation entry and press the 1 key to request QPSK then press the Enter key to apply this new parameter value Scroll right to the Data column and down to the Bit Rate parameter and press 56 and Enter Without Quick entry we would have to press Edit 0 0 5 6 and Enter Note that if digits other than 0 had been set in positions after the last 6 of the va...

Страница 52: ... operate within your own system These include setting those parameters which fall into three major categories Data Interface compatibility Automatic Correction for link properties and Alarm configuration 2 9 4 1 Data Interface Compatibility Mod and Demod Data Sense Mod and Demod Clock Source Mod and Demod Clock Phase Default Mod Clock is now Auto Modulator RTS Enable 2 9 4 2 Automatic Correction A...

Страница 53: ...ailable are to set the alarm to either be ignored or to form one of the OR inputs to the A or B alarm relay or both The default set up for these alarms is to have all the modulator related alarms assigned to Alarm A and all demodulator alarms assigned to Alarm B The two alarm relays could be changed to represent Major and Minor alarms The open collector outputs for the modulator and demodulator al...

Страница 54: ...ing the Internal or an External Reference The PSM 500 contains an internal Temperature Compensated Crystal Oscillator TCXO reference which determines the basic accuracy of all modem frequency and rate settings This internal reference is a nominal 2 0 ppm stability over normal operating temperature and exhibits aging less than 1 ppm per year This is accurate for most applications and for example pr...

Страница 55: ... changed whenever necessary This field allows identification of the modem with up to 16 characters The Unit ID can be set easily from the VT100 terminal mode and with slightly more effort from the unit front panel To set the Unit ID use the front panel arrow keys to scroll to the Unit Status Unit ID parameter and pressing Edit to begin entry Each character position is selected using the right and ...

Страница 56: ...e Appendix C for more cabling information The modem is also capable of accepting one of several existing and to be implemented additional option interfaces These include a 10 Base T Ethernet interface a High Speed Serial Interface HSSI a G 703 interface and others The main processor automatically determines the presence and type of interface and options by querying the interface card Adding an opt...

Страница 57: ...y SCSI 2 type connector located on the rear panel This connection is designed to interface directly with a Cisco or compatible HSSI router interface module via a commercially available HSSI cable See Appendix C for more cable information 2 10 2 Optional Interface Configuration Installed interface cards are automatically recognized by the modem and an entry is added to the Interface Option selectio...

Страница 58: ...usly Turbo Product Codes or TPC is available in multiple mechanical forms and also versions depending on the link requirements The three versions are a TPC4K which uses the same TPC chip as in the PSM 4900 series of modems and a TPC16K which uses a newer 16K block size to improve performance and a TPC 20K board with both the TPC4k and TPC16k chips installed Because of the larger processed block si...

Страница 59: ... 2 27 M500 Series Main PCB FEC Slot A Rear Panel Latches Interface Option Connector TPC16k TPC4k Flash FPGA DRA05 002 FEC Slot B FEC Card Main PCB Side View Showing Insertion Top View J3 and J4 Connectors Slot B must be empty to install in Slot A Figure 2 5 FEC Option Card Installation ...

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Страница 61: ...rs each described below 3 1 2 1 Front Panel LCD Display The front panel display is a 2 line by 16 character LCD display It is augmented by the four LED highlighted legends to the display s right The display and legends are lighted and the brightness can be set to increase when the front panel is currently in use automatically dimming with inactivity The display has four distinct areas showing curr...

Страница 62: ...eys are gray This allows easy identification of the Enter key The second area is a set of Arrow or Cursor keys used to navigate the parameter currently being monitored or controlled During entry the cursor keys allow moving a cursor to individual digits of a numerical entry or scrolling through the available options of a selection entry The arrow keys are also in blue The third area is the four se...

Страница 63: ...t Enter Clear 1 2 3 4 5 6 7 8 9 0 no yes Unit Mod Dem Int f IF Frequency 70 125613MHz PSM500 Satellite Modem DATUM SYSTEMS Transmit Major Alm Minor Alm Test Lock Major Alm Minor Alm Test Modulator Demodulator Power Sum Alarm Local Remote Figure 3 1 PSM 500 Front Panel Controls and Indicators ...

Страница 64: ...rm B 3 Local Green Indicates that the unit is set to respond to the front panel 4 Remote Green Indicates that the unit is set to respond to the remote control input Modulator LED Indicators 1 Transmit Green Indicates that the transmit output is currently active Green Flashing when an IF Looback test is active and the carrier is configured to the disabled state 2 Major Alarm Red Indicates that the ...

Страница 65: ...ividual parameters associated with that function The columns include such divisions as Status Alarm and Test areas The LCD display allows viewing only one of the many parameters at one time At any time the LCD display shows the monitored parameter value on the lower line of the two line display The upper left line of the display shows the column name such as Status IF Data Alarm and Test while the...

Страница 66: ...r In any entry mode pressing the Edit key to indicate a new entry then editing the parameter via the arrow keys and the numeric keypad and finalizing the data entry using the Enter key will work The Quick entry mode allows direct entry of a new value without first pressing the Edit key All entry items take one of two forms 1 Numeric entry such as frequency or bit rate and 2 Selection from a list s...

Страница 67: ...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 An example of this is when entering an IF Modulation mode change the modem will accept that but next request entry of the Data FEC type then the Data Code Rate finally returning to the origin...

Страница 68: ... area can be immediately accessed in the other by pressing the appropriate Mod or Dem button For example when viewing the Mod Bit Rate the Demod Bit Rate is accessed by simply pressing the Dem button 3 The Alarm columns existing in all four matrixes and represents the disposition of alarm information from that source Therefore the Dem Alarm CXR Lock sets the disposition of the Demodulator Carrier ...

Страница 69: ... Idle Rate Hardware Ref AFC Model Restore 2 LCD Cntst Format Beep SysClk AFC Feature Restore 3 Activity Port 3 3V Serial Restore 4 Activity 5 0V Version Restore 5 12 0V FEC A Restore 6 21 0V FEC A Ver Restore 7 12 0V FEC B Restore 8 Boot Code FEC B Ver Power Up Mod Opt Int f Opt Notes Parameters shown in gray are only available when the entry immediately above is enabled or set to a mode that requ...

Страница 70: ...n Lvl Mute Impedance BUC parameters are only available on PSM 500L AUPC settings are only visible if the AUPC is enabled Dif Encoder disabled and not visible with Turbo Product Codes Option installed and enabled Table 3 3 PSM 500 Front Panel Parameter Matrix Demodulator Sheet Status IF Data Mux LNB Alarm Test CXR Frequency Bit Rate Mode Power CXR Lock IF Loopbck Eb No Sweep Range Fec ESC Overhead ...

Страница 71: ...rm Test I O Mode IP Addr Tst Active Ter Loopbck RTS Format Netwrk Mask BER Loss Sat Loopbck CTS RTS MAC Addr SnIP or SDMS BER I O DCD CTS Options Mod BER DTR DCD Version Demod BER DSR DTR Serial Test DSR Test BER Xmt Data Sync Loss Xmt Clock Errors Rcv Data Bits Rcv Clock EFS RTS Monitor Erred Sec Total Sec Note The seven shaded BERT Status column items are only visible when the Demod BER is enabl...

Страница 72: ...for user Status Model PSM 500 Read Only Read from software Modem Model Status Feature M523 8PSK 16QAM Numeric 16 digit Feature Set upgrade code inserted here Used to display features and upgrade feature set Status Serial 12923 Read Only Not changeable Modem Serial Number Status Version 0 10 Read Only Read from software Version of software installed Status FEC A Viterbi TCM RS Read Only Read from I...

Страница 73: ...r 1 Sec Selection Numeric Disabled 0 1 to 14 400 seconds Time after loss of rcv carrier to restore this configuration Restore 2 7 Config Restore 8 Disabled Selection Numeric Disabled 0 1 to 14 400 seconds Time after loss of rcv carrier to restore this configuration Config Power Up Last Selection Numeric Last 0 Recall 1 to 8 Behavior on power up Either the last settings or try to lock using one of ...

Страница 74: ...0 None 1 Beep 2 Blink 3 Beep Blink Audible click on or and Remote LED Blink on Remote port activity USB Mode Full Access Selection 0 Disable 1 Read Only 2 Full Access Remote control access mode allowed from front panel port USB Activity Blink Selection 0 None 1 Beep 2 Blink 3 Beep Blink Audible click on or and Remote LED Blink on Infrared port activity Ref Source Internal Selection 0 Internal 1 Ex...

Страница 75: ...On Alarm B 3 On Alarm A B Selects if alarm causes a unit audible beep Test Modem Disabled Selection 0 Disabled 1 Lamp Test 2 Self Test 3 Lamp Self Test Carrier output mode for test purposes Test Cal Ref Disabled Selection 0 Disabled 1 Enabled Calibrates the internal reference to an external input Test Update ROM Disabled Numeric Normally Disabled Enter unit serial number and Enter key to start Ent...

Страница 76: ...6QAM Modulation Mode Some values left available for new options IF Spectrum Normal Selection 0 Normal 1 Inverted Modulation Spectrum control IF Filter Mask Normal Selection 0 IESS 1 Legacy Modulation Spectrum Filter Control Legacy for PSM 4900 compatibility IF Mode Continuous Selection 0 Continuous 1 Burst Only available with burst option installed IF Preamble 64 Symbols Selection 0 32 1 64 Symbol...

Страница 77: ... 308 2 IESS 309 4 IESS Custom Reed Solomon column and options only available if not disabled Entry is not shown when TPC enabled RS FEC n 126 Numeric In Custom Mode only Available n values Read only in other modes Block size n 22 to 255 RS FEC k 112 Numeric In Custom Mode only Available k values Read only in other modes k 20 to 253 k must be 2 to 20 less than n RS FEC depth 4 Selection In Custom M...

Страница 78: ... Mux ESC Rate 9600 bps Selection 0 to 7 selects standard rates 300 bps 38 4 kbps Physical ESC port rate at rear panel coupled to receive Mux ESC Frmt N 8 1 Selection 0 N 7 1 1 P 7 1 2 N 8 1 3 P 8 1 Physical ESC port format at rear panel coupled to receive BUC Power Enabled Selection 0 Disabled 1 Enabled Selects Power and Voltage to a BUC in the 500L BUC Voltage Out 23 8V Numeric Read Only Displays...

Страница 79: ...stination of alarm Alarm Tst Active To Alarm A Selection 0 None 1 A 2 B 3 A B Selects destination of alarm Alarm Hardware To Alarm A B Selection 0 Mute CXR 1 Mute Alarm A 2 Mute Alarm B 3 Mute Alarm A B Selects destination of alarm Alarm BUC Power Mute Alarm A 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 of alarm Test Modulation Norma...

Страница 80: ...fer status in percent fill Only visible when Demod Data clock source is not set to RCV Clock The slip flag tells when the FIFO automatically re centered Status Test Normal Read Only N A Demodulator Test Status IF Frequency 70 000000MHz Numeric 50 000 000 to 90 000 000 MHz 950 000 000 to 1900 000 000 MHz for L Band unit Carrier center frequency L Band frequency shown if LNB LO is set to 0 else is s...

Страница 81: ...ed Solomon is enabled in R S column Legacy in Rate 7 8 only CT compatibility Rate only Data FEC Option Normal Selection 0 Normal 1 Swap C0 C1 2 Invert C1 3 Swap and Invert C1 FEC Optional Modes May change depending on FEC options installed Data Code Rate Rate 1 2 Selection 0 1 2 5 6 3 7 8 0 2 3 in 8PSK TCM FEC Code Rate The options may change depending on FEC installed and selected R S Mode IESS 3...

Страница 82: ...ed Data FEC Hold 1 Numeric 0 to 255 Normally set to 1 Number of FEC lock cycles the FEC will accomplish before declaring loss of lock Mux Mode IBS Custom 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 On...

Страница 83: ... A Selection 0 None 1 A 2 B 3 A B 4 Mute Mod CXR 5 Mute Alarm A 6 Mute Alarm B 7 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 Low Eb No To Alarm A Selection 0 None 1 A 2 B 3 A B Selects destination of alarm Alarm Low Level To Alarm A Selection 0 None 1 A 2 B 3 A B Selects destination of alarm Alarm Tst Active To...

Страница 84: ...ameter Detail Representation Type Entry Description Test LO AFC 8 8V Read Only N A Internal Loop Voltage Test Step AFC 9 4V Read Only N A Internal Loop Voltage Test IDcOff 0 1V Read Only N A Internal Loop Voltage I channel DC offset Test QDcOff 0 1V Read Only N A Internal Loop Voltage Q channel DC offset ...

Страница 85: ...face Test status Status Errors 7 Read Only N A Interface Test status Status Bits 1 45 E7 Read Only N A Interface Test status Status EFS 99 95 Read Only N A Interface Test status Status Erred Sec 1 Read Only N A Interface Test status Status Total Sec 2135 Read Only N A Interface Test status I O Mode RS 449 Selection 0 Disable 1 RS 232 2 RS 449 3 RS 449 Unterm 4 V 35 5 V 36 6 EIA 530 7 EIA 530A 8 Sn...

Страница 86: ...rface MAC Address SnIP Options 00007f Read Only Read Only Displays SnIP Options enabled SnIP Version 021771 001 50 Read Only Read Only Displays SnIP Software Version Number SnIP Serial 1200047 Read Only Read Only Displays SnIP Serial Number Alarm Tst Active to Alarm A Selection 0 None 1 A 2 B 3 A B Selects destination of alarm Alarm BER Loss to Alarm B Selection 0 None 1 A 2 B 3 A B Selects destin...

Страница 87: ...00 Option 0 and then setting the Unit Remote Port Unit Remote Rate and Unit Remote Format parameters as desired Then a VT100 protocol terminal is connected to connector J6 All operating software for the terminal mode is contained within the PSM 500 modem internal control software A break signal on the communications line pressing Control R on the terminal or power on of the modem will initiate ful...

Страница 88: ...reen Selection 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 PSM 500 VT100 Terminal Control Unit Status Modem Demod Tst Active Reference Internal Ok C Redundcy Internal 1 1 D Unit ID...

Страница 89: ...ed screen then the item to be modified and pressing the terminal key of the option letter A through Z For example to change the modulator s carrier frequency you must first go to the modulator screen if not already there Press 1 1 and press the terminal s A key lower case is fine The modem screen will respond by presenting the options or input range available and waiting for input The operator inp...

Страница 90: ... a closing flag and check word to verify the packet integrity The use of a source address allows multiple controllers on a single control link 3 4 1 System Unit Programming Communications The communications protocol is unique This mode is termed command mode communications in the following discussion and is normally accomplished via an RS 485 4 wire connection to the modem at Control connector J6 ...

Страница 91: ...arrier Frequency 70 00 MHz Data Rate 256 kbps Modulation QPSK Code Rate Rate 1 2 Differential Encoder Enabled Scrambler Auto Clock phase Normal Data Normal Clock Source Internal RTS Ignore Carrier Off All Mod Alarms to Relay A Modem Unit Modem Reference Internal 10 MHz Remote Port Address 1 Remote Port RS 232 Remote Mode Binary Packet Remote Rate 9 6 kbps Remote Data Format 8 data bits 1 stop no p...

Страница 92: ...ol power control and reference control Receive Frequency Control When the LNB Local Oscillator or LO frequency is entered into the Dem LNB LO Frequency parameter the Dem IF Frequency parameter entry allows and requires entry of receive frequency at the actual satellite downlink RF frequency To return to using L Band IF frequencies set the LNB LO Frequency parameter to 0 LNB Power Control The PSM 5...

Страница 93: ...empts to maintain a constant Eb No at the receive end of an SCPC link by adjusting the transmit power at the transmit end of the link This is especially useful when operating over a satellite at Ku Band frequencies in locations with high rainfall periods The AUPC function requires a data channel at 300 to 1200 baud in order to operate This data channel can either be external to the modem that is p...

Страница 94: ... operating control software to limit response times and detect adverse operating conditions 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...

Страница 95: ...hannel that may be enabled to compensate for cyclical variations in the receive data rate or different systems clocks at the two link ends A receive buffer of this type is sometimes referred to as a Plesiochronous buffer when the intent is to absorb different clocks on the transmit and receive end This type of clock difference is usually uni directional and cumulative Cyclical variations are most ...

Страница 96: ...g the upper half of the FIFO restoring the fill to 100 re centering the FIFO The data flushed is lost and cannot be recovered An under run occurs when the last bit is clocked out of the FIFO emptying it This also causes re centering of the FIFO by resetting the buffer pointers to the mid or 100 level resending all the data in the buffer Both conditions result in a potential serious disruption of t...

Страница 97: ...n options and parameters used to determine operating modes In overview the procedure is to Note The two modems MUST be the same model number and type and should be at the same firmware revision for proper redundant operation 1 Configure the first modem completely for the intended operating parameters including setting the redundancy parameter to 1 1 This initial unit should not be in alarm 2 Physi...

Страница 98: ...Line and the failure state of the paired modems is done by viewing the LED indicators on the front panels In a fully operating set up there will be no alarms on either unit but one modem will have the green Modulator Transmit LED illuminated and the other will have the transmit LED extinguished The other LED indicators still show the relevant condition of the Modulator Demodulator and Unit A more ...

Страница 99: ...ks to the modem as if a DTE is sending and receiving data The Terrestrial direction appears to the line as if a DCE device is sending and receiving data The use of the BERT is more fully described in the Maintenance Section 4 1 2 3 12 Analog Monitor Output Operation The PSM 500 modem has a built in function to output an analog voltage representing the current value of one of three internal paramet...

Страница 100: ...ating in a redundancy mode Several examples more clearly illustrate the use and operation of the automatic configuration recovery ACR Consider a demand access type system where modems not currently in use are intended to be placed at a home location This would consist of mainly a receive IF frequency and data rate where the modem could receive assignment information By storing the necessary parame...

Страница 101: ...any of the 8 stored configurations to be recalled on each power up cycle This could be useful in a mobile environment or a DAMA system where a home channel is desired on each power up In a large system units can be pre set to a specific configuration for use in initially bringing up a site and then easily changed to another configuration for normal operation 3 15 2 Monitors and Outputs The PSM 500...

Страница 102: ...er 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 The next SDLC HDLC flag received by the modulator is the end of transmission signal 5 When the closing flag is detected by the modulator it drops the CTS indicating that a new data message ca...

Страница 103: ...nce is an automatic procedure enabled from the unit s front panel Go to Unit Test Cal Ref to enable the calibration procedure Caution The Reference Calibration procedure may result in lost traffic during performance of the calibration The calibration should not be performed in operating links without prior arrangements Before beginning an internal reference calibration an external reference must b...

Страница 104: ...nd IF Loop Back This second loop back will verify the modem transmit data signal processing modulation demodulation receive signal processing and connection to the receive interface 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 Far End Satellite Data Loop...

Страница 105: ...osses that have occurred since the test began or was last reset 3 Errors The total number of bit errors that have occurred since the test began or was last reset Errored bits do not accumulate during a sync loss 4 Bits The total number of bits that have been received since the test began or was last reset 5 EFS Error Free Seconds The percentage of the total number of seconds with no errors occurri...

Страница 106: ...drawbacks to this method are the availability of extra equipment and the possibility of interaction between two or more equipment items Symptom The Modem will not acquire the incoming carrier Possible Cause Improper receive input to modem Action Check that the receive cabling is correct Possible Cause Receive carrier level too low Action Check that the receive cabling is correct that the downconve...

Страница 107: ...stitution of another modem will verify the correct modem functioning Symptom The Modem output data is corrupted Possible Cause Receive data or clock inverted Action Check the current state of the Demod Clock and Data Phase Try inverting the phase Possible Cause Receive Carrier signal Eb No is too low resulting in poor BER performance Action Ensure that the transmit end is properly set and that the...

Страница 108: ...odulator FPGA failed to program correctly 4 DS4 MSTP FAULT Red Indicates that the transmit step synthesizer is unlocked Normally this would result only from an onboard fault 5 DS5 REF FAULT Red Indicates that the onboard TCXO reference oscillator is not phase locked when set to an external reference input 6 DS6 System Clock Alarm Red Indicates that the 80 MHz clock hardware has failed 7 DS7 DEM LO...

Страница 109: ...ating its main loop program which responds to control inputs monitors and displays terminal and LED status controls the modulator output FEC operating modes etc 4 2 3 Built in Lamp Test 4 2 3 1 Lamp Test The Front Panel LEDs and LCD display backlight are tested This is meant to be viewed by an operator During the 4 seconds of this test both alarm relays are forced off Eb No input level and offset ...

Страница 110: ...version number and yyy is the applicable unit type as explained below M500Ux xx yyy fbf Binary image of the modem s main Unit software firmware M500U is for the Unit where currently exists yyy values of o 000 for a 70 MHz modem o 001 for a 140 MHz Modem o 040 for the L Band Modems D M500Fx xx yyy zip where x xx is the current version number and yyy is the applicable FEC card type as explained belo...

Страница 111: ...d with the programs 4 3 1 1 M500 Update Program The M500Update program is designed to be very simple to install and use It looks at the modem and the fbf files in its own directory and determines if an update is available You only need to push one button and the program will load the main unit and any FEC files needed by the modem The program is normally installed in a folder directory of your cho...

Страница 112: ...ere select the ftd2xx inf file Then let windows do the rest If notified that the driver is not certified select Continue Anyway The supplied drivers are from a reputable source that manufactures the USB interface chip The modem has a complementary program which talks to the loader and controls re writing of the flash memory No actions to the modem are normally necessary before beginning update wit...

Страница 113: ...re initialization and calibration Complete update of the modem normally requires approximately 4 to 6 minutes The process cannot be accomplished on multiple modems simultaneously Before performing an update check the web site first to determine if there is a later firmware revision and if there is any advantage to performing the update The firmware revision on the web is compared to that in the mo...

Страница 114: ...to the modem it will display as below Not the Current Version after the File Firmware Version 0 08 000 indicating the selected file is the same as that loaded 5 If the binary file versions available in this directory are newer than those in the modem then select the Update M500 FLASH button and the update process will begin 6 When completed the modem will reset itself and the revised information w...

Страница 115: ...00 500L 500LT Rev 0 91 Page 4 13 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 ...

Страница 116: ...ll be provided with a special 16 digit code which is used to enable the upgraded features The code is unique to this unit s serial number and will not work in any other modem To insert the code go to the Unit Status Feature parameter using the front panel keypad Then enter the 16 digits of the given code directly using the digits on the keypad then press the Enter key If correctly entered the mode...

Страница 117: ... with that made by other modem manufacturers The PSM 500 also has a significant number of FEC compatibility modes for aid in achieving compatibility with some competitive modems especially in Turbo FEC modes These modes are denoted by the FEC Option CT on the front panel selection These modes are typified by the modes used in the CDM5xx and CDM6xx series of competitive modems There are several mod...

Страница 118: ...modes The 500 s Custom mode is not compatible with the PSM 2100 For the AUPC to function and to be compatible with a PSM 2100 it must be set in the Enhanced mode How do I set up the Reed Solomon 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 Reed Solomon Codec beyond the capabilities of the PSM 2100 To maintain compatib...

Страница 119: ...r in most situations That is the Eb No which is a function without the slope changes and negative signal sense of the AGC signal 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 measur...

Страница 120: ... occasionally someone disabled it and then had problems locking up to carriers so this capability was initially removed from front panel control All of the latest firmware however now allows this control so you may need to update your firmware How do I enter a number with a minus sign At any time during the Edit process the key will change the sign of the current entry if the change is possible In...

Страница 121: ...purposes These units would have a model number indicating this such as PST for a Modulator transmit only or PSD indicating a Demodulator receive only The other reason could be that the Modulator or Demodulator is disabled To check and enable if desired go to the Unit Config Modem parameter which shows what is enabled and allows changing What do the abbreviations on the front panel and in the manua...

Страница 122: ...Why do I keep getting sync losses on my link Or why does a BERT test show sync losses This is usually a sign that some section of the link has a clock or data inversion See Chapter 4 of the manual for Loop testing to try to determine where the problem is and correct either the wiring or change the modem data or clock sense Why does the modem occasionally fail to operate with my DTE equipment and t...

Страница 123: ...nel and in the manual mean A good example is the display and manual representation Redundcy SW Rqst Unfortunately the display does not hold enough characters to display the full text of Redundancy Switch Request Following is a list of abbreviations used Abbreviation Full Text 1 1 1 N M N One for One One for N and M for N All redundancy switch types ACR Automatic Configuration Recovery AFC Automati...

Страница 124: ...tiplexer Opt Option OverHd Overhead RCV Rcv Receive into the Demodulator Redundcy Redundancy Ref Reference Rqst Request RS R S Reed Solomon Type of FEC Sat Satellite SCPC Single Channel Per Carrier SER Symbol Error Rate SnIP Satellite network Interface Processor our name for an Ethernet Interface running Linux SW Sw Switch Sync Synchronous or Synchronization SysClk System Clock Ter Terr Terrestria...

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