CM701/DT7000 Reed-Solomon Module
Contents
1. A 225 205 10 B 219 201 9 C 126 112 7 1 00E 00 1 00E 01 1 00E 02 Uncoded 1 00E 03 1 00E 04 D O 274 9 fer Pa 1 00E 05 Viterbi 2 8 Q 1 00E 06 q Mies 7 Viterbi 3 4 1 00E 07 1 00E 08 A Cc ATE VR i Vit R S 3 4 Miterit Ha 1 00E 09 NO O AN 0 0 tTnNQAA ANH OE N MR OO ON ON ON ap ap on T f T LO LO LO O O O N N N Eb No dB Figure 3 Reed Solomon Performance Gain COMSTREAM CONFIDENTIAL AND PROPRIETARY 21 INTELSAT Reed Solomon Option CM701 PSK Digital Modem Specifications Data Rates 4 800 to 8544 kbps in 1 bps increments NOTE CM701 data rate range depends on modules installed The above range is only for the Intelsat Reed Solomon option module Message block size k Refer to Table 4 Code word size n Refer to Table 4 Interleave depth 4 Scrambler type Synchronous IBS Scrambler Table 4 Reed Solomon Coding Specifications Information Code Selected Scrambling Rate n k t I RSAuto 64 000 1 639 998 126 112 7 Off done by BEE ee Unit 1 639 999 2 143 998 225 205 10 2 143 999 6 407 998 219 201 9 2 6 407 999 8 544 000 194 178 8 NOTE nis the number of code bytes block size k is the number of information bytes in the block t is 2 the number of parity bytes and also the number of2. R S Rx CIk Tracking Err will occur if the decoder data rate setting does not correspond with the associated DTE or the demodulator or when there is an R S Dec Sync Loss R S Enc I O In Err will appear if there is a hardware problem or while new data rates are taking effect R S Dec I O In Err will appear if there is a hardware problem or while new data rates are taking effect R S Enc I O Out Err will appear if there is a hardware problem or while new data rates are taking effect R S Dec I O Out Err will appear if there is a hardware problem or while new data rates are taking effect NVRAM Failure will appear if a parameter stored in a nonvolatile memory location is corrupted Self Test Failure indicates a hardware problem discovered during the built in test COMSTREAM CONFIDENTIAL AND PROPRIETARY 9 INTELSAT Reed Solomon Option CM701 PSK Digital Modem Remote Control Operation CBE CBM The following remote commands are related to the Reed Solomon option module For more information on remote control operation and setup refer to the Remote Control chapter of the CM701 Manual NOTE All of the fault conditions are set upon power up After power up faults must be cleared before the fault register is valid Reed Solomon Estimated Bit Error Rate Monitor The CBE command displays the bit error rate as estimated by the Reed Solomon decoder CBE The value is returned in a two digit coded exponential format whe
3. 219 201 194 178 126 112 Reed Solomon Decoder Dec Code Size Auto Code Size 225 205 219 201 194 178 126 112 Receive Descrambling Rx Descrambling I RSAuto Transmit Scrambling Tx Scrambling I RSAuto 1 Command is located in Demod menu 2 Command is located in Mod menu NOTE The data rates do not need to be set during Reed Solomon module configuration if the remote control commands PRD and PTD or their front panel equivalents have been used to set data rates If data rates are set using the Reed Solomon configuration commands then each card in the path will have to have its data rate set individually COMSTREAM CONFIDENTIAL AND PROPRIETARY 5 INTELSAT Reed Solomon Option CM701 PSK Digital Modem Reed Solomon Transmit Clock In NV sets the rate of the transmit data entering the Reed Solomon encoder The range is 4800 to 8544000 bps in 1 bps increments Reed Solomon Transmit Clock Out Query only reports the rate of the data leaving the Reed Solomon encoder given the correct transmit clock in In most applications this parameter must match the data rate of the modulator This parameter is computed using the following formula CTO CTD x Message Bytes Parity Bytes Message Bytes Reed Solomon Receive Clock In Query only reports the expected rate of the data entering the Reed Solomon decoder In most applications this parameter must match the data rate of the demodulator This parameter is computed using the follow
4. 00 0 0 esse ss ee see se Ged ee GRA GRA GRA GR GR Ge 16 Reed Solomon Coding Specifications ees se se sk Se ee Se AA ee ee 22 COMSTREAM CONFIDENTIAL AND PROPRIETARY MPreface Using this Guide Welcome to the ComStream world of satellite based communication systems and networks This guide is your sourcebook for using ComStream s Intelsat Reed Solomon Option Module It describes the installation operation and performance specifications of this product The sections in this guide provide step by step instructions for a variety of tasks and activities including installing and operating the Reed Solomon Option Module The sections also provide an overview of system operations as well as technical specifications and troubleshooting procedures Conventions Used in this Guide This guide is designed to help you find and use information quickly and easily To take full advantage of this design please take a moment to review the specific formats Locating Information The table of contents located at the beginning provides you with an outline of the major topics contained in this guide Special Paragraphs Throughout this guide you will find special paragraphs designed to help you identify important information These paragraphs are NOTE This identifies information for the proper operation of your equipment including helpful hints shortcuts or important reminders CAUTION This identifies information that requires ca
5. Decoder Code Size NV allows the user to either let the card select the receive Reed Solomon code size according to Intelsat specifications or manually select which code to use The options are e Auto e 225 205 e 219 201 e 194 178 e 126 112 Receive Descrambling NV specifies the descrambling algorithm applied to the receive data stream In addition to the options listed in the CM701 modem manual the Reed Solomon module adds I RS Auto and I RSMan I RSAuto lets the module automatically enable or disable descrambling depending on the data rate in compliance with Intelsat specifications See Table 4 Descrambling on the Reed Solomon module will be active only at Framing Unit data rates of 1544 kbps or more or Reed Solomon information rates of 1640 kbps and up I RSMan enables the synchronous descrambler on the Reed Solomon module at all data rates This is recommended when the system has no Framing Unit option module This command is in the Demod menu Transmit Scrambling NV specifies the scrambling algorithm applied to the transmit data stream In addition to the options listed in the CM701 manual the Reed Solomon module adds I RS Auto and I RSMan I RSAuto lets the module automatically enable or disable scrambling depending on the data rate in compliance with Intelsat specifications See Table 4 Scrambling on the Reed Solomon module will be active only at Framing Unit data rates of 1544 kbps or more or Reed Solomon informat
6. OE EE EE AE EE viii Customer Support se ese gee Me GE EES ea eee ea e a A a pisito viii Reed Solomon Intelsat Version Option OVELVICW us Sr toa a Ri 1 Functional Description omic a e a i 1 Installation sorteen ae ae ea a oa r ae Tera ot EARE EE gee ete 2 Front Panel Operation RE EE RR EE ee di 4 Configuration Commands 0 cece se ee ee ee ee ee Ge Ge GR RA GR ee ee ee ee 5 Monitor Command cial ie IE oe Deeg sos eke ee de 8 Fault Commands ie EER ER dci GR De do 8 Fault Reportin o Ee ER ER EE ED EE ee adh EE bede da Do Du Ge EE 9 Remote Control Operation sesse se se ee ee ee ee ee ee ee i RA GR ee 10 Remote Fault Monitoring and Fault Reporting ss se ee ee ee Se Re ee 15 MCSD 2s OE EE OE OE EE MAER AE ES 19 Specifications RE EO OE EE ii 22 Mechanical Environmental ee RA SA Re ee ee ee ee 22 COMSTREAM CONFIDENTIAL AND PROPRIETARY iii Contents CM701 PSK Digital Satellite Modem List of Figures Figure 1 Figure 2 Figure 3 Reed Solomon Option Module Block Diagram esse sees see ee ee ee 1 CM701 Rear View with Reed Solomon Option Module Installed 2 Reed Solomon Performance Gain eee 21 List of Tables Table 1 Table 1 Table 2 Table 3 Table 4 Revisi n History ii viii Reed Solomon Option Configuration Commands sesse see ss ee ed 5 Reed Solomon Status Register Summary ee ee ee ee ee ee 13 Fault Log Register SUMMALY
7. 8 Vertical Option Tx Hardware Flt 268435456 Vertical Option Rx Hardware Flt The only acceptable parameter for this query is FL The following faults will cause a Vertical Option Tx Summary Fault R S Enc I O In Err R S Enc I O Out Err R S Tx Clk Tracking Err R S Tx Clk Range Err The following faults will cause a Vertical Option Rx Summary Fault R S Dec I O In Err R S Dec I O Out Err R S Rx Clk Tracking Err R S Rx Clk Range Err R S Dec Sync Loss The following faults will cause a Vertical Option Tx Hardware Fault None The following faults will cause a Vertical Option Rx Hardware Fault None 16 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem FLO FO VF VFT INTELSAT Reed Solomon Option Fault Log Overlay Mask Configuration NV The FLO command designates the fault condition history that will illuminate the yellow FAULT message on the front panel The CM701 has a 32 bit fault log register that has each bit assigned to represent a single fault To monitor only the faults that are possibly related to the Reed Solomon option card enter the following FLO 503316480 Status Relay Overlay Mask Configuration NV The FO command designates the faults that will affect the Status Relay on the rear panel of the CM701 A 32 bit current fault register has each bit assigned to a single fault To monitor only the faults that are possibly related to the Reed Solomon option card on the Sta
8. 8 kbps The preceding rates are Framing Unit data rates The Reed Solomon option module is not limited to these Front Panel Operation The CM701 front panel allows the user to monitor and control the Reed Solomon option card without a remote terminal This section describes the front panel parameters relating to the Reed Solomon option card The front panel command tree has three main branches Configuration Monitor and Fault All configuration commands are stored in either nonvolatile NV memory or volatile V memory For more information on the use of the front panel refer to the Front Panel Operation chapter of the CM701 Operation Manual COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option Configuration Commands Configuration commands are accessed by selecting the Config path and by selecting the Reed Solomon module labeled I R S Table 1 summarizes the commands Table 1 Reed Solomon Option Configuration Commands Complete Name LCD Label LCD Parameter Reed Solomon Transmit Tx In 4800 to 8544000 Clock In bps Reed Solomon Transmit Tx Out 5268 to 9312000 Clock Out bps Reed Solomon Receive Rx Out 4800 to 8544000 Clock Out bps Reed Solomon Receive Rx In 5268 to 9312000 Clock In bps Reed Solomon Near End R S Loopback Disabled Enabled Loopback Reed Solomon Bypass R S Bypass OFF Mode Tx Rx Tx Rx Reed Solomon Encoder Enc Code Size Auto Code Size 225 205
9. CA 92121 2724 USA RMA Unit number Do not include product accessories such as Installation and Operation guides or rack mount brackets CAUTION When handling or shipping static sensitive equipment observe antistatic procedures and always use antistatic bags for shipment Upon request ComStream will provide you with ESD bags for your use All equipment upgrade and repair requests will be completely evaluated and the required work performed in an expedient and prompt manner The equipment will then be thoroughly tested for compliance with appropriate specifications COMSTREAM CONFIDENTIAL AND PROPRIETARY vii Preface CM701 PSK Digital Satellite Modem Revision History This guide is periodically updated and revised The following table lists the revision number and date and provides a description of the type of revision made to the guide For documentation updates call ComStream Customer Service located in the United States at 619 657 5454 toll free 888 559 0831 or fax your request to 619 657 5455 NOTE Revision A is always the first official release to ComStream customers Table i Revision History Customer Support We hope this guide provides all of the information and instructions you need to operate the Reed Solomon Option Module However in the event that you need further assistance or 1f problems are encountered ComStream has set up a Customer Support Line for your use Please feel free to contact ComStrea
10. CM701 DT7000 Reed Solomon Option Module Intelsat Version Installation and Operation Guide COMSTREAM A Spar Company 6350 SEQUENCE DRIVE e SAN DIEGO CALIFORNIA 92121 2724 619 458 1800 Copyright 1998 ComStream Corporation All rights reserved CPN 01 0388 401 Rev C 07 98 NOTICE This publication and its contents are proprietary to ComStream Corporation ComStream and are intended solely for the contractual use of its customers for no other purpose than to install and operate the equipment described herein This publication and its contents shall not be used or distributed for any other purpose and or otherwise communicated disclosed or reproduced in any way whatsoever without the prior written consent of ComStream For the proper installation and operation of this equipment and or all parts thereof the instructions in this manual must be strictly and explicitly followed by experienced personnel All of the contents of this manual must be fully read and understood prior to installing or operating any of the equipment or parts thereof FAILURE TO COMPLETELY READ AND FULLY UNDERSTAND AND FOLLOW ALL OF THE CONTENTS OF THIS MANUAL PRIOR TO INSTALLING AND OR OPERATING THIS EQUIPMENT OR PARTS THEREOF MAY RESULT IN DAMAGE TO THE EQUIPMENT OR PARTS THEREOF AND TO ANY PERSONS INSTALLING AND OR OPERATING THE SAME ComStream does not assume any liability arising out of the application or use of any products component parts ci
11. Solomon Option CM701 PSK Digital Modem 20 Functional Test To run the test below a modulator and demodulator must be present All tests can be performed using either the internal BERT or an external BERT To perform a full functional test without noise enable the Reed Solomon loopback and use either the internal BERT or an external BERT to confirm that clock rate in equals clock rate out that the Reed Solomon decoder is synchronized and that the BERT does not report any bit errors Also verify that the CCE remote command reports no errors corrected After this has been done an IF loopback test can be performed If a noise generator is available you can do a performance test and then compare the performance with Figure 3 The Reed Solomon will report the error correction rate via the CCE remote command or the R S Byte Error Rate front panel command Expected performance gains achieved by using the Reed Solomon option card can be determined through the use of the graph in Figure 3 The Reed Solomon code 194 178 8 would be approximately halfway between B and C in Figure 3 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option
12. e Installed After the Reed Solomon option card is installed the CM701 will automatically insert it electrically into the data path on power up if the ACP command is set to 1 default NOTE CM701 modems with M amp C software version 2 3 or older require manual backplane configuration If you have M amp C or modulator demodulator software before version 4 1 contact ComStream Customer Service older software will not support full functionality of this option Perform the following steps to configure the module for operation NOTE Tf a specific Reed Solomon scrambling mode was selected and you physically remove the Reed Solomon module from the CM701 and turn the CM701 power on with the module out the scrambling descrambling options will get changed to no scrambling descrambling SM 0 SD 0 Any other scrambling options will have to be set as described in the CM701 manual If the Reed Solomon module is later reinstalled you will have to reconfigure the scrambling descrambling options as for initial installation 2 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option Select the transmit scrambler s operating mode This can be done with the front panel command Tx Scrambling located under the Mod menu or with the remote command SM I RSAuto SM 6 automatically turns scrambling on or off based on the data rates in compliance with Intelsat specifications Scrambling on the Intelsat Reed Solom
13. eaver nization Demod Figure 1 Reed Solomon Option Module Block Diagram The Reed Solomon module accepts user selectable input data rates from 4800 bps to 8544 kbps in 1 bps increments In auto mode the module automatically selects the Reed Solomon coding interleaving scrambling algorithms to comply with Intelsat specification IESS 308 Revision 6B Appendix F Another mode lets the user choose which Reed Solomon code size to use COMSTREAM CONFIDENTIAL AND PROPRIETARY 1 INTELSAT Reed Solomon Option CM701 PSK Digital Modem Installation The Reed Solomon option card can be installed in any general purpose vertical option card slot Refer to the Troubleshooting Self test and Maintenance chapter of the CM701 manual for a detailed explanation of installation and handling Figure 2 shows an example of option installation el ser an E JB ESC Audio J9 ESC Data J10 Backwards Alarm JH Alam 3 o N ED of o E lt a ma a oe ON FO ON Po ON Framing Uni s Ea Opti s F H m E E a 2 ption A EM E sO Quem O yz acc o Card Es g axe O SY icopback YI Monitor Slot F El EH x E Demodulator 70 MHz gt 3 EH E 8 EH 48 nn E J a e E y Modulator 70 MHz VO Monitor amp e CCA Control Silkscreen Silkscreen CCA Slot Identification Slot Identification Inside Caver Lip Inside Cover Lip Figure 2 CM701 Rear View with Reed Solomon Option Modul
14. errors that can be fully corrected within the block n k 2t Mechanical Environmental Temperature Operating 0 C to 50 C Nonoperating 20 C to 70 C Current consumption 970 ma 5 V 64 ma 15 V 3 ma 15 V 22 COMSTREAM CONFIDENTIAL AND PROPRIETARY
15. ew Current Fault Status The VS command queries the CM701 for its real time fault conditions with a verbose description for each module No parameter is required for the VS command VS Alarm Reporting The AL command controls the unsolicited fault reporting by the CM701 to a remote control terminal An AL parameter of 0 disables fault reporting an AL parameter of 1 enables it AL 1 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem CF Testing INTELSAT Reed Solomon Option Clear Faults The CF command clears all displayed faults and permits monitoring for recurrence of faults No parameter is required for the CF command CF For more information on the VS AL and CF commands refer to the Remote Control chapter of the CM701 Manual Board Level Test To perform a board level hardware test enter the following command from the remote or on the front panel using the remote terminal emulator feature X BIT 4 where X is the chassis slot number of the Reed Solomon module This test takes approximately 2 minutes Then enter the command X STR If all tests pass the response will be STR_0 Any other response indicates a hardware failure and you should contact ComStream customer service NOTE Data flow will be interrupted when this test is performed The board will be returned to its original configuration when the test is complete COMSTREAM CONFIDENTIAL AND PROPRIETARY 19 INTELSAT Reed
16. he CTD command sets the rate of the transmit data entering the Reed Solomon encoder The range is 4800 bps to 8544000 bps in 1 bps increments CTD 64000 NOTE You can ascertain which Reed Solomon code is being used from the information rate remote control commands CRD and CTD and Table 4 in the Specifications section Reed Solomon Transmit Clock Out Query Only The CTO command reports the rate of the data leaving the Reed Solomon encoder In most applications the parameter must match the data rate of the modulator The parameter is computed using the following formula CTO CTD x Message Bytes HParity Bytes EMessage Bytes CTO Receive Path Descrambling Configuration NV The SD command specifies the descrambling algorithm applied to the data stream In addition to the parameters listed in the CM701 manual the Reed Solomon option module adds 6 and 7 Parameter 6 is equivalent to RSAuto and lets the module automatically enable or disable descrambling depending on the information rate into the Reed Solomon module in compliance with Intelsat specifications Descrambling on the Intelsat Reed Solomon option module will be active only at Framing Unit data rates of 1544 kbps or more or Reed Solomon information rates of 1640 kbps or more Parameter 7 is equivalent to RSMan and enables the synchronous descrambler on the Reed Solomon module at all data rates This is recommended when the system has no Framing Unit option
17. iguration NV The CDK allows the user to either let the card select the receive Reed Solomon code size according to Intelsat specifications or manually select which code to use The options are e Auto e 225 205 10 e 2 219 201 9 e 3 194 178 8 e 4 126 112 7 CDK 1 Reed Solomon Sync Status Monitor The CDS command returns a 1 if the Reed Solomon decoder is locked to the sync pattern or a O if it has lost track of the sync pattern CDS Reed Solomon Encoder Code Size Configuration NV The CEK allows the user to either let the card select the transmit Reed Solomon code size according to Intelsat specifications or manually select which code to use The options are e O Auto e 1 225 205 10 e 2 219 201 9 e 3 194 178 8 e 4 126 112 7 CEK 1 COMSTREAM CONFIDENTIAL AND PROPRIETARY 11 INTELSAT Reed Solomon Option CM701 PSK Digital Modem CLB CRD CRI Reed Solomon Loopback Configuration V The CLB command sets near end loopback if the parameter is 1 If the parameter is O near end loopback is disabled If near end loopback is enabled the output of the encoder is routed to the input of the decoder CLB 1 Reed Solomon Receive Clock Out Configuration NV The CRD command sets the rate of the receive data leaving the Reed Solomon decoder The range is 4800 to 8544000 bps in 1 bps increments CRD 64000 NOTE The data rates do not need to be set during Reed Solomon mod
18. ing formula CRI CRD x Message Bytes HParity Bytes EMessage Bytes NOTE You can ascertain which Reed Solomon code is being used from the information rate remote control commands CRD and CTD and Table 4 in the Specifications section Reed Solomon Receive Clock Out NV sets the rate of the receive data leaving the Reed Solomon decoder The range is 4800 to 8544000 bps Reed Solomon Loopback V enables the output of the encoder section to be routed directly to the input of the decoder section for testing purposes Reed Solomon Bypass Mode NV allows the user to bypass either part or all of the Reed Solomon card The options are e Nobypass e Tx Rx bypass e Tx bypass e Rx bypass NOTE If bypass is selected option 1 2 or 3 above and the information rate into the Reed Solomon module is 1640 kbps or higher the IDR scrambler and or descrambler on the CM701 modulator and or demodulator will be activated depending on the bypass and scrambling options You can use CTD on the encoder side or CRD on the decoder side to query the data rates 6 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option Reed Solomon Encoder Code Size NV allows the user to either let the card select the transmit Reed Solomon code size according to Intelsat specifications or manually select which code to use The options are e Auto e 225 205 e 219 201 e 194 178 e 126 112 Reed Solomon
19. ion rates of 1640 kbps and up I RSMan enables the synchronous scrambler on the Reed Solomon module at all data rates This is recommended when the system has no Framing Unit option modules COMSTREAM CONFIDENTIAL AND PROPRIETARY 7 INTELSAT Reed Solomon Option CM701 PSK Digital Modem Monitor Commands Monitor commands are accessed via the front panel Monitor menu In addition to other monitor commands the Reed Solomon will display the following commands R S Byte Error Rate 1x10 5 This displays the channel byte error rate as perceived by the Reed Solomon decoder For this example the byte error rate is one byte error every 100 000 10 bytes The displayed range is 1x10 to 0x10 R S Bit Error Rate 1x10 6 This displays the output bit error rate as estimated by the Reed Solomon decoder For this example the bit error rate is one bit error every 1 000 000 10 bits The displayed range is 1x104 to 0x10 A display of 0x 10 indicates zero detected errors The above are averages calculated over the past 9600 n bytes where n is the Reed Solomon code length Fault Commands Front panel fault commands are accessible via the Fault path The following menu headings are displayed NOTE All of the fault conditions are set upon power up After power up faults must be cleared before the fault register is valid Fault Log displays all faults that have occurred since a fault clear command was issued Fault Log is ass
20. lt monitoring and fault log reporting Current fault monitoring is the real time reporting of any fault condition and fault log reporting is a report of all faults since the fault log register was last cleared The following are partial descriptions of the commands and reports as they apply to the Reed Solomon module For a more detailed explanation of fault monitoring and fault log reporting refer to the Remote Control chapter of the CM701 Manual Reed Solomon Status The CST command queries the Reed Solomon module for its current status The module has a 32 bit status register that uses each bit to represent a status flag The response to this command is a decimal number that represents the contents of the 32 bit status register For more information refer to the command description in the previous section COMSTREAM CONFIDENTIAL AND PROPRIETARY 15 INTELSAT Reed Solomon Option CM701 PSK Digital Modem FL Fault Log Query Faults The FL command queries the CM701 for its stored fault history The CM701 has a 32 bit fault log register in which each bit represents a single fault The response to this command is a decimal number that represents the contents of that 32 bit fault log register The fault log register bits that are possibly related to the Reed Solomon option module are summarized in Table 3 Table 3 Fault Log Register Summary ig 33554432 Vertical Option Tx Summary Flt 67108864 Vertical Option Rx Summary Fit 13421772
21. m Customer Support located in the United States by phone or fax at the following numbers e Phone 619 657 5454 toll free 888 559 0831 Monday through Friday 8 00 a m to 5 00 p m Pacific time e Fax 619 657 5455 viii COMSTREAM CONFIDENTIAL AND PROPRIETARY Reed Solomon Intelsat Version Option Overview This option manual describes the installation operation and specifications of the CM701 Reed Solomon Intelsat version option module The Reed Solomon option module is a Field Replaceable Unit FRU that can be easily added and configured without sending the modem back to the factory Insert this option manual into the CM701 modem manual If the Reed Solomon option module is to be used in the DT7000 modem the references to the CM701 modem manual apply to the DT7000 modem manual Functional Description R S Encoder Interleaver Scrambler To from The Reed Solomon option module supplements the CM701 modem s standard forward error correction FEC to improve the bit error rate performance by approximately 3 dB The Intelsat Reed Solomon option module implements a Reed Solomon encoder and byte interleaver on the transmit path and a synchronizing circuit deinterleaver and Reed Solomon decoder on the receive path As shown in Figure 1 the encoder and decoder functions are completely independent Mod l other i option 1 card or Loopback To From VO card Backplane I R S De Synchro From Decoder interl
22. module SD 6 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem SM INTELSAT Reed Solomon Option Receive Path Descrambling Configuration NV The SM command specifies the scrambling algorithm applied to the data stream In addition to the parameters listed in the CM701 manual the Reed Solomon option module adds 6 and 7 Parameter 6 is equivalent to I RSAuto and lets the module automatically enable or disable scrambling depending on the information rate into the Reed Solomon module in compliance with Intelsat specifications Descrambling on the Intelsat Reed Solomon option module will be active only at Framing Unit data rates of 1544 kbps or more or Reed Solomon information rates of 1640 kbps or more Parameter 7 is equivalent to I RSMan and enables the synchronous scrambler on the Reed Solomon module at all data rates This 1s recommended when the system has no Framing Unit option module SM 6 NOTE If bypass is selected option 1 2 or 3 above and the information rate into the Reed Solomon module is 1640 kbps or higher the IDR scrambler and or descrambler on the CM701 modulator and or demodulator will be activated depending on the bypass and scrambling options You can use CTD on the encoder side or CRD on the decoder side to query the data rates Remote Fault Monitoring and Fault Reporting CST The CM701 continually monitors for internal hardware faults and has two ways to display them current fau
23. ociated with the yellow FAULT indicator on the front panel This fault indicator can be masked with the FLO command described in the Remote Fault Monitoring and Fault Reporting section of this manual Current displays all currently active faults associated with the red FAULT indicator If the condition that caused the fault has disappeared then there will be no current fault message or red fault indicator This fault indicator can be masked with an STO command described in the Remote Fault Monitoring and Fault Reporting section of this manual Clear resets the fault log register and the current fault register The current fault register remains cleared only until the existing faults can be relogged 8 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option Fault Reporting The following faults generated by the Reed Solomon option card are reported via the front panel R S Dec Sync Loss will occur if the Reed Solomon decoder cannot locate the synchronization pattern in the data R S Tx CIk Tracking Err will occur if the encoder data rate setting does not correspond with the associated DTE or the modulator R S Tx CIk Range Err will occur if the transmit clock coming into the board from the DTE or the Framing Unit card is more than 150 ppm from where it should be R S Rx Clk Range Err will occur if the receive clock from the demodulator is more than 300 ppm from where it should be
24. on option module will be active only for user data rates 1544 kbps and greater I RSMan SM 7 enables the synchronous scrambler on the Reed Solomon option card at all rates This is recommended when the system has no Framing Unit option card Select the receive descrambler s operating mode This can be done with the front panel Rx Descrambling command located under the Demod menu or with the SD remote command I RS Auto SD 6 lets the module automatically enable or disable descrambling based on the data rate in compliance with Intelsat specifications Descrambling on the Intelsat Reed Solomon option module is active only at user data rates of 1544 kbps and greater I RSMan SD 7 enables the synchronous descrambler on the Reed Solomon option card at all rates This applies when the system has no Framing Unit option card installed For more information on scrambling descrambling options refer to the Remote Control chapter of the CM701 Manual Select the module s bypass mode with the R S Bypass front panel command or with the CBM remote command The default is Tx Rx bypass No faults for the bypassed part of the module will be reported The options are e O No bypass e 1 Tx Rx bypass e 2 Tx bypass e 3 Rx bypass NOTE If bypass is selected option 1 2 or 3 above and the 4 information rate into the Reed Solomon module is 1640 kbps or higher the IDR scrambler and or descrambler on the CM701 modulator and or demod
25. ot be removed defaced or altered Further to preserve the warranty the product should not be subjected to abuse improper installation or application alteration accident or negligence in use storage transportation or handling Any returned product shall be completely evaluated in an attempt to duplicate the problem so that appropriate corrective action and repair may be completed Following repair the product shall be thoroughly tested for compliance with appropriate specifications This process will be handled in an expedient and prompt manner but may be subject to available labor and material resources The ComStream warranty as stated herein is in lieu of all other warranties expressed implied or statutory For further information please contact ComStream Customer Service at 619 657 5454 or toll free 888 559 0831 COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Satellite Modem Preface Return Procedure If it is necessary to return a product for out of warranty repair upgrade or any modification the following procedures must be followed 1 Contact ComStream Customer Service located in the United States via phone or fax Phone 619 657 5454 or toll free at 888 559 0831 Fax 619 657 5455 Speak to a ComStream customer service representative about any questions issues or problems Quite often equipment problems can be corrected over the phone which keeps your equipment in service and a
26. rcuits software or firmware described herein ComStream further does not convey any license under its patent trademark copyright or common law rights nor the similar rights of others ComStream further reserves the right to make any changes in any products or parts thereof described herein without notice O Copyright 1998 ComStream Corporation This equipment has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and radiates radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense WARNING Shock Hazard Do Not Open The Equipment Service Only By ComStream The Reed Solomon Option Module contains no user serviceable parts Do not attempt to service this product yourself Any attempt to do so will negate any and all warranties CM701 PSK Digital Satellite Modem Contents Table of Contents Preface Using this Guide a ER v Warranty Statement ii A A E pesa Load vi Return Procedure td eee ee vii Revision History arosine EE AR
27. re the first digit represents the mantissa and the second the exponent e g 26 2x10 The range of values is 14 to 09 1x10 to 0x102 This is an average calculated over the past 9600 n bytes where n is the Reed Solomon code length Reed Solomon Bypass Mode Configuration NV The CBM command allows the user to bypass either part or all of the Reed Solomon card The options are e 0 No bypass e 1 Tx Rx bypass e 2 Tx bypass e 3 Rx bypass CBMO NOTE If bypass is selected option 1 2 or 3 above and the information rate into the Reed Solomon module is 1640 kbps or higher the IDR scrambler and or descrambler on the CM701 modulator and or demodulator will be activated depending on the bypass and scrambling options You can use CTD on the encoder side or CRD on the decoder side to query the data rates COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem CCE CDK CDS CEK INTELSAT Reed Solomon Option Reed Solomon Channel Byte Error Rate Monitor The CCE command displays the channel byte error rate as perceived by the Reed Solomon decoder CCE The value is returned in a two digit coded exponential format where the first digit represents the mantissa and the second the exponent e g 15 1x105 The range of values is 12 to 09 1x10 to 0x109 This is an average calculated over the past 9600 n bytes where n is the Reed Solomon code length Reed Solomon Decoder Code Size Conf
28. reful attention in order to prevent equipment damage and or injury to the Operator COMSTREAM CONFIDENTIAL AND PROPRIETARY v Preface CM701 PSK Digital Satellite Modem Warranty Statement vi ComStream warrants that its products are free from defects in material and workmanship at the time of shipment and that they conform to applicable specifications In no event will ComStream be liable for consequential misuse or damages The ComStream Intelsat Reed Solomon Option Module is warranted against any above mentioned defects that appear within one year of shipping date Should it be necessary to make a claim against this warranty the buyer shall first notify ComStream s Customer Service Department to define the nature of the problem When returning products please be aware of the following 1 Products returned to ComStream whether for upgrade warranted or out of watranty repair work or maintenance must comply with the ComStream Return Procedure located on the next page 2 Products shall be forwarded to ComStream transportation prepaid Products returned to ComStream freight collect or without a return material authorization RMA number will NOT be accepted ComStream shall not accept any responsibility for returned products that are improperly packaged and or damaged in shipment If possible please use original shipping and packing materials Original product identification markings and labels must n
29. tus Relay enter the following FO 503316480 View faults The VF command queries the CM701 for its stored fault history No parameter is required for the VF command VF View Faults with Time Stamp The VFT command queries the CM701 for the last 10 faults since the faults were cleared These faults also have a time and date stamp on each one No parameter is required for the VFT command VFT For more information on VF and VFT commands refer to the Remote Control chapter of the CM701 Manual COMSTREAM CONFIDENTIAL AND PROPRIETARY 17 INTELSAT Reed Solomon Option CM701 PSK Digital Modem ST STO VS AL Current Fault Status Faults The ST command queries the CM701 for its real time fault conditions A 32 bit current fault register has each bit assigned to represent a single fault The response to this command is a decimal number that represents the contents of the 32 bit register The current fault register bits that are possibly related to the Reed Solomon option card are summarized in Table 3 The only acceptable parameter is ST Current Fault Status Overlay Mask Configuration NV The STO command designates which fault condition will illuminate the red FAULT message on the front panel The 32 bit current fault register has each bit assigned to a single fault To monitor only the faults that are possibly related to the Reed Solomon option card the following command would be entered STO 503316480 Vi
30. ulator will be activated depending on the bypass and scrambling options You can use the remote commands CTD on the encoder side and CRD on the decoder side to query the data rates You can also use the front panel commands Reed Solomon Transmit Clock In and Reed Solomon Receive Clock Out to query the data rates If a Demodulator is installed it will provide an E N alarm feature You can set this feature via the remote command EBT You can enter the EBT command via the front panel remote simulator EBT 67 will cause the modem to log a fault when the E N falls below 6 7 dB COMSTREAM CONFIDENTIAL AND PROPRIETARY 3 INTELSAT Reed Solomon Option 5 CM701 PSK Digital Modem Assuming that the Reed Solomon module is in the primary transmit path along with a Framing Unit option module enter the primary transmit data rate This can be done via the UserTxData front panel command located under the system menu or the PTD remote terminal command Acceptable Framing Unit information rates are 64 128 192 256 384 512 768 1024 1544 2048 6312 and 8448 kbps Assuming that the Reed Solomon module is in the primary receive path along with a Framing Unit option module enter the primary receive data rate This can be done via the UserRxData front panel command located under the system menu or the remote command PRD The acceptable Framing Unit information rates are 64 128 192 256 384 512 768 1024 1544 2048 6312 and 844
31. ule configuration if the remote control commands PRD and PTD or their front panel equivalents have been used to set data rates If data rates are set using the Reed Solomon configuration commands then each card in the path will have to have its data rate set individually Reed Solomon Receive Clock In Query Only The CRI command reports the rate of the data entering the Reed Solomon decoder In most applications the parameter must match the data rate of the demodulator This parameter is computed using the following formula CRI CRD x Message Bytes HParity Bytes Message Bytes CRI COMSTREAM CONFIDENTIAL AND PROPRIETARY CM701 PSK Digital Modem INTELSAT Reed Solomon Option CST Reed Solomon Status The CST command queries the Reed Solomon module for its current status The module has a 32 bit status register that uses each bit to represent a status flag The response to this command is a decimal number that represents the contents of the 32 bit status register The status register bits are summarized in Table 2 Table 2 Reed Solomon Status Register Summary Weight DO 1 NVRAM Failure 2 4 Reserved 3 8 FPGAProgramBror 6 64 R SRxCikTrackingE 8 2565 RSEneVOImEr 9 52 RSEneUOOu Er ara Reserved COMSTREAM CONFIDENTIAL AND PROPRIETARY 13 INTELSAT Reed Solomon Option CM701 PSK Digital Modem CTD CTO SD Reed Solomon Transmit Clock In Configuration NV T
32. voids unnecessary and costly downtime Should it be necessary to return a product to ComStream for any reason the ComStream customer service representative will issue you a return material authorization RMA number To issue an RMA number the ComStream representative will need the product s serial number model number and a description of the problem You may be returning a product for either repair upgrade or modification If you are returning the product for Repair please include a complete description of the problem the operating conditions which caused the problem and any circumstances that may have led to the problem This information is essential for ComStream repair technicians to reproduce diagnose and correct the problem Upgrade or modification please include a complete description of the current configuration and the desired change s This information will allow a ComStream customer service representative to provide a formal quote for the upgrade Include a purchase order for any upgrade or out of warranty repair work being performed ComStream will begin repair work after a PO is received Reference the RMA number on all paperwork that accompanies the equipment and write the RMA number clearly on the outside of the shipping container Ship your module in the original shipping carton and packing or its equivalent prepaid to the following address ComStream Corporation 6350 Sequence Drive San Diego
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