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Paradise Datacom P300 Series, Руководство по установке и эксплуатации

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P300H

P300 Series Modem Installation and Operating Handbook

Page 69

OFFSET QPSK (OQPSK) PRIMER

When using Offset  QPSK  (OQPSK)  modulation,  the  in  phase  and  quadrature  components  of  each 
symbol do not change together (as with QPSK), but instead one component is delayed by half a symbol
compared  to  the  other.  Looking  at  a  constellation  (vector)  diagram  this  effectively  limits  the

instantaneous

 change of phase to /-90 degrees, excluding the 180 degree phase change which

takes the vector transition through the zero amplitude point (equating to an instantaneous null in the RF 
envelope). By preventing the carrier phase change moving through the null power point, large amplitude 
variations of the output carrier are avoided. Consequently on links which exhibit some non-linearity (and
therefore  probably  some  AM  to  PM  conversion),  there  is  reduced  amplitude  modulation  (AM)  to get
converted  to  Phase  Modulation  (PM)  which  would otherwise degrade the  distant  Eb/No  as  a  phase 
noise effect.

6.6.11  Change, Tx/Rx, Modulator, FEC Menu

The operator is first prompted to select the Forward Error Correction (FEC) type, and the choices are
between:

Select FEC Type: [?] 

1=None  2=Viterbi  3=Sequential  4=TCM Rate 2/3 5=Turbo

Change, Tx/Rx, Mod/Demod, FEC Type Menu 

 

ÒÑÒÛ

 (uncoded) 

 

Ê×ÌÛÎÞ×

 (if Viterbi FEC option fitted) 

 

ÍÛÏËÛÒÌ×ßÔ

 (if Sequential FEC option fitted) 

 

ÌÝÓ

 (Trellis Code Modulation if the 8PSK/TCM feature is available, Rate 2/3 only) 

 

Ì«®¾±

 (Turbo Product Code FEC, if the Turbo option is available) 

Pressing

ÇÛÍ

 accepts the current FEC type, and where there is a choice of FEC rates leads onto the

FEC Code Rate selection screen. Note that 8PSK and TCM must be used together, and that for TCM
only rate 

 is available. 

For  a  review  of the

processing  delay  associated  with  the  Sequential  decoder

,  and  how  this  is 

minimised, please refer to "FaultMode = 3" in Appendix E. 

If  interworking  with  other  manufacturers equipment it  is  worth  reading  the  notes  in  the  section 

Interworking  different  manufacturers  equipment on  page  155  which  covers  primarily  scrambling,  but

also  the  requirements  for  Spectrum  Invert  with  Viterbi/Sequential  in  BPSK  and  QPSK. If specifically
interworking with Comstream equipment with sequential FEC, see also Appendix E for  Fault Mode 11" 
(Comstream compatible sequential mode). 

For

Ê·¬»®¾·

 and 

Í»¯«»²¬·¿´

 FEC the FEC rate selection screen is as follows:

Select FEC Rate: [?] 

1=1/2 Rate  2=3/4 Rate  3=7/8 Rate

Change, Tx/Rx, Mod/Demod, FEC Rate Menu (Vit/Seq) 

The  FEC  code  rate  may  be  select  as 1/2, 3/4, or

Rate,  again pressing 

ÇÛÍ

 will  accept  the  current 

FEC  rate  and  return  to  the  Change,  Tx,  Modulator menu.  Most  INTELSAT  services  use  the  more 
powerful 1/2 rate or 3/4 rate FEC (increasing the data rate by factors of 2 and 4/3 respectively). 

The  operator  is  warned of  unusual combinations of  Modulation and  FEC  type/code  rate when 

ÍÛÌËÐó

ÝØÛÝÕ

 is requested. 

Содержание P300 Series

Страница 1: ...ontinuing programme of product improvement and therefore reserves the right to change specifications without notice EN 55024 Installation Operating Handbook for P300 Series Satellite Modems including P310 L Band and Turbo FEC options Paradise Datacom Ltd Paradise Datacom LLC 1 Wheaton Road 328 Innovation Blvd gland Suite 100 Stat Fax 01376 533764 Fax 814 238 3829 http www paradisedata com INFORMAT...

Страница 2: ... 1 MINUTE GUIDE TO FRONT PANEL OPERATION 43 6 2 MENU STRUCTURE DIAGRAMS 44 6 2 1 Menu Structure Sheet 1 7 Main Status Change 45 6 2 2 Full Menu Structure Sheet 2 7 Main Monitor Info 46 6 2 3 Full Menu Structure Sheet 3 7 Main Log Test Setup Action Help 47 6 2 4 Full Menu Structure Sheet 4 7 Main Change User Opt Operation 48 6 2 5 Full Menu Structure Sheet 5 7 Change Tx 49 6 2 6 Full Menu Structure...

Страница 3: ...enu 81 6 6 28 Custom IBS Overhead Allocation 83 6 6 29 Change Tx Rx ESC Aux BA ASYNC ESC Menu 84 6 6 30 Change Tx Rx ESC Aux BA Config Async BAUD RATE Menu 85 6 6 31 Change Tx Rx ESC Aux BA Config Async FORMAT Menu 85 6 6 32 Change Tx Rx ESC Aux BA Config Async SET AS REM M C 85 6 6 33 Change Tx Rx ESC Aux BA INTERFACES Menu 86 6 6 34 Change Tx Rx ESC Aux BA AUDIO LEVELS Menu 87 6 6 35 Change Tx R...

Страница 4: ...NITS Menu 114 6 12 6 Change BUC LNB Tx BUC BUC CONTROL Menu 114 6 12 7 Change BUC LNB Rx LNB Menu 115 6 12 8 Change BUC LNB Rx LNB LNB Type Menu 115 6 12 9 Change BUC LNB Rx LNB DC REFERENCES Menu 116 6 12 10 Change BUC LNB Rx LNB SHF FREQUENCIES Menu 116 6 12 11 Change BUC LNB TUNE REF Menu 117 6 13 MONITOR MENU 117 6 13 1 Monitor DEMOD PERFORMANCE Menu 117 6 13 2 Monitor TERRESTRIAL BER Menu 118...

Страница 5: ...9 8 7 2 Closed Network Plus ESC via the Custom Service menu 150 8 7 3 ESC channel with mis match configurations 150 8 8 CROSS REFERENCE TO SDM300 D I FRAMING MODES 152 8 9 V 35 SCRAMBLERS 154 8 10 INTERWORKING DIFFERENT MANUFACTURERS EQUIPMENT 155 8 11 INTRODUCTION TO AUPC AUTOMATIC UPLINK POWER CONTROL 156 8 11 1 Introduction 156 8 11 2 Configuring AUPC for operation 159 8 12 TUTORIAL ON CARRIER ...

Страница 6: ...APPENDIX C6 FEATURES NOT AVAILABLE 199 APPENDIX D REMOTE M C 200 REMOTE M C PROTOCOL 200 Summary 200 Character Format Baud Rate 200 Electrical Interface 200 Message Structure 201 Message Categories 202 List of All Remote M C Messages 203 APPENDIX E CUSTOMER SPECIFIC FEATURES 207 RELAY MODE SETTING 207 FAULT MODE SETTING 208 UNCOMMITTED DAC OUTPUT CONTROL 211 APPENDIX F FRAMING AND DROP INSERT OVER...

Страница 7: ...MUST BE OPERATED WITH ITS COVER ON AT ALL TIMES If it is necessary to remove the cover for any reason then you must ensure that the cover is correctly refitted before normal operation 2 Damage to the front panel keyboard membrane or mechanical damage to the chassis could invalidate compliancy Please contact the factory if damage occurs for advice on continued operation 3 For the baseband data inte...

Страница 8: ...uipment is classified in EN 60950 as a pluggable equipment class A for connection to the mains supply As such it is provided with a mains inlet cord suitable for use in the country of operation In normal circumstances this will be of an adequate length for installation in the rack If the mains cable proves to be too short then any replacement must have a similar type fuse if fitted and be manufact...

Страница 9: ...or if the Wideband IF feature is available standard on P300 IBS and above 140MHz The status of a unit is available externally on form c relay outputs designed to connect to station monitoring system The modem also provides a complete remote Monitor Control M C port allowing the status to be remotely monitored and the unit controlled or the configuration changed If Async ESC feature is available st...

Страница 10: ...quire the addition of extra hardware It might appear that the words Feature and Option are used interchangeably In practice however we have attempted to use Options to refer to functions which always require hardware to be fitted whereas we use Features to refer to functions which may be software enabled without extra hardware being fitted For example we refer to both IDR and G 703 Options as thes...

Страница 11: ...IESS 308 P1348 Emulation 32 64kbps Aux data in place of one both IDR audio ESC PRBS Tester Internal Bit Error Rate Tester BERT overhead modes only 8PSK TCM 8PSK with rate Trellis Code Modulation to IESS 310 Extended D I Independent timeslot re ordering on Tx Rx Signalling CAS for E1 RBS for T1 Rx Partial Insert for multi destinational working Timeslot ID maintenance for N 1 to 31 with IBS SMS or C...

Страница 12: ...ncy clock reference with external station clock input options for higher stability internal references CCITT INTELSAT V 35 scramblers for closed network operation with additional two modes for compatibility with FDC and Linkabit proprietary patterns Deferred alarm at user set service limits individual Eb No BER Buffer slip thresholds Frequency locked clock loops ie not phase locked immune to clock...

Страница 13: ...he normal error multiplying V 35 self synchronising scrambler A high rate async ESC channel in IBS SMS overhead achieving 2400 Baud with a 64kbps carrier requires IBS SMS feature standard on P300 IBS and above Async access to the IDR 8kbps synchronous ESC channel requires IDR option standard on P300 IDR and above Software selectable RS232 RS485 or RS422 interface IBS SMS Feature Satellite Framing ...

Страница 14: ...channels In IBS SMS Minimum Overhead modes it provide a synchronous port which can be configured to use from 1 32 to 21 32 of the IBS SMS overhead eg for internal or external BER testing When set to 1 32 and used asynchronously it provides the INTELSAT compliant Low Rate ESC channel PRBS tester feature The internal Pseudo Random Binary Sequence PRBS Bit Error Rate Tester BERT offers the following ...

Страница 15: ...n ESC and Aux channels in IBS SMS modes providing user control over the relative rates of the async ESC channel and the sync Aux channel 1 st Generation Turbo Product Code Forward Error Correction TPC FEC Turbo codec for bandwidth and power efficiency Software can support up to 31 preset code rates initial rates includes rate1 2 3 4 7 8 0 789 3 4 Rate for compatibility with industry De Facto Turbo...

Страница 16: ...stigation into customer reports of poor link performance and can provide a useful correlation against weather conditions etc 3 2 FAULT PHILOSOPHY Faults are split into two categories a UNIT FAULTS Equipment failures such as a synthesiser lock failure b TRAFFIC FAULTS Data path failures such as a lack of input clock A full description of every detected fault its category unit or traffic and the cor...

Страница 17: ...ff It may be intentionally switched off or it may be muted due to either a fault an external mute signal or if in a 1 FOR 1 redundant pair it may be the standby unit of previous products has been moved to the rear panel and is now combined onto the Async ESC co to obtain 8 pin din audio type connector See the des age rear panel description which starts on the next p LED Indicators Five LEDs on the...

Страница 18: ...el of 0dBm or greater An alternative Station Clock signal at RS422 interface levels can be applied to the Async ESC connector Either signal can be used by the modem as a reference for the receive output clock the Station Clock does not have to be the same rate as the data as an internal PLL converts between rates In addition if the Rx Clocking is set to use the Station Clock and the Tx Clocking is...

Страница 19: ...in D female connector provides a superset of the features found previously on the front panel circular 8 pin din connector It includes an RS232 serial port for the loading or revised internal software from a PC or the printing of the units traffic log to a serial printer PC terminal emulator If the Monitor AGC option is fitted it provides I Q and symbol clock outputs to monitor the receive constel...

Страница 20: ...e used which is standard 25 pin RS232 compatible and for RS422 the 37 pin RS449 connector The old style 34 pin Winchester connector favoured for V 35 interfaces has poor EMC performance and so could not be incorporated whilst maintaining CE compliance If this style of connector is required then an external adaptor cable must be used If the G 703 option is fitted then in addition to RS422 V 35 RS23...

Страница 21: ...P300H P300 Series Modem Installation and Operating Handbook Page 21 F BLOCK DIAGRAM ...

Страница 22: ...P300H P300 Series Modem Installation and Operating Handbook Page 22 ...

Страница 23: ...dition to RS422 V 35 RS232 software selectable For special requirements a customer specific interface card may be fitted User Data Rates Closed Network Resolution of 1 bps Rate Rate Rate Uncoded Rate BPSK min 4 8k 7 2k 8 4k 9 6k max 1250k 1875k 2187k 2500k QPSK OQPSK min 9 6k 14 4k 16 8k 19 2k max 2 5M 3 75M 4 375M 5 0M 8PSK TURBO min 21 6k 25 2k max 5 0M 5 0M 8PSK TCM min 19 2k max 5 0M Closed Ne...

Страница 24: ...us ESC 32kbps or above synchronised to ESC overhead Less than 32kbps as per Closed Network V 35 scrambler has CCITT INTELSAT FDC Linkabit modes IF Ports BNC female 50 75 Return loss 18dB typical External reference Clocking only 1kHz 10MHz in 1kHz steps See Station Reference Clocking Frequency 10MHz 0dBm 1dB Modulator Specifications Output Power Level P300 0 to 25dBm continuously variable in 0 1dB ...

Страница 25: ... Demodulator Specifications IF Input Range P300 45dBm nominal 5dB desired carrier P310 20 to 70dBm desired carrier Maximum Composite Signal P300 30dB above level of desired input up to a maximum of 0dBm P310 35dB above level of desired input up to a maximum of 10dBm Frequency Acquisition Selectable from 1 kHz to 32 kHz Range Acquisition Threshold 5dB Eb No Acquisition Time 9 6 kbps 3 seconds at 6d...

Страница 26: ... 9 5dB Sequential 64kbps 1 x 10 4 4 3dB 5 4dB 6 4dB 1 x 10 8 6 4dB 7 3dB 8 6dB Sequential 2048kbps 1 x 10 4 5 6dB 6 1dB 6 9dB 1 x 10 8 7 5dB 8 1dB 8 4dB Turbo TPC QPSK all rates 1 x 10 4 2 2dB 2 7dB 3 5dB 1 x 10 8 2 8dB 3 6dB 3 8dB 8PSK Turbo TPC 1 x 10 4 5 2dB 6 4dB 1 x 10 8 6 4dB 6 8dB 8PSK TCM all rates 1 x 10 3 6 3dB 1 x 10 8 10 4dB 8PSK TCM Reed Solomon all rates 1 x 10 4 6 1dB 1 x 10 10 7 3d...

Страница 27: ... Clocking Clock from satellite Buffer disable Transmit input clock plesiochronous includes full asymmetric rate operation Internal Reference see Internal Reference below for stability DCE External timing clock DTE interface only Station reference see below Internal Reference P300 1PPM P310 Default as per P300 Options 7x10 7 per year P313B 1x10 7 per year P313C 7 5x10 8 per year P313D Station Refer...

Страница 28: ...s where a single uncorrectable RS codeword can contain enough corrupt frame alignment words to knock an INTELSAT specified deframer out of frame sync INTELSAT Reed Solomon Codec Custom Features Format Concatenated Reed Solomon outer codec to IESS 308 310 Code Rate Default n k t 126 112 7 depth 4 automatically switching to 225 205 10 depth 4 for 1544 kbps IDR mode 219 201 9 depth 4 for 2048 kbps ID...

Страница 29: ...Timeslot ID Maintenance The IBS SMS or Closed Net plus ESC overhead maintains the identity of individual D I timeslots for N 1 2 3 4 5 6 8 10 12 15 16 20 24 30 see Extended D I Feature below Extended Drop Insert Feature Timeslot Re ordering Selected timeslots may be independently re ordered on both Tx and Rx paths Timeslot ID Maintenance The IBS SMS or Closed Net plus ESC overhead is extended to m...

Страница 30: ...lite data rate ESC limit is approx 70 of main channel rate overhead varies from 0 5 to 70 IBS SMS High rate async data using from 1 32nd to 22 32nd of the IBS overhead providing async baud rates from 0 2 to 5 1 of the terrestrial rate eg up to 2400 Baud at 64 kbps Includes modes compatible with the P400 Series P230 P1300 P1361 using 20 32nd of the overhead IDR Option IDR ESC Audio Interface Two 32...

Страница 31: ...ata access P1348 Emulation The IDR Option includes the facility to emulate the more common modes of our popular P1348 P1448 voice data mux cards which are used extensively in SNG applications It uses the IDR audio ESC ports for the audio interfaces and can generate a 64 kbps carrier consisting solely of two 32kbps ADPCM encoded audio channels or a 128 kbps carrier comprising the two audio channels...

Страница 32: ...unprinted entries read over remote M C bus Auto Uplink Power Control AUPC Modes of operation Monitor of distant Eb No BER only Full distant Eb No maintenance Self monitor broadcast modes Unidirectional or bidirectional operation Communication link Utilises async ESC channel on IBS SMS IDR and Closed Net Plus ESC carriers ESC from 300Baud ie overheads down to 1 User parameters Target Eb No Toleranc...

Страница 33: ...ast wide angle LCD 15 Key tactile full keyboard Remote M C For multi drop applications RS485 interface for direct to PC applications RS232 interface front panel selectable M C port may be directly internally linked to ESC port for distant end over the satellite M C without cabling Redundancy Features 1 1 redundancy controller built in Y cables passively split data maintaining impedances L Band inp...

Страница 34: ... fused Fuse rating T3 15AH 250V 3 15A fuse time delay high rupture current for 250V supply Maximum rating of fuse in supply plug or at the supply distribution board is 5A P310 Option P324 for 48V DC primary input power Safety EN 60555 2 EMC EN 55022 Class B emissions EN 55024 Part 1 immunity Environmental Operating temperature range 0 to 50C Supporting Products The P300 Series are supported by the...

Страница 35: ...P300H P300 Series Modem Installation and Operating Handbook Page 35 P300 Modem Series Error Probability versus Eb No Viterbi Decoding ...

Страница 36: ...P300H P300 Series Modem Installation and Operating Handbook Page 36 P300 Modem Series Error Probability versus Eb No Sequential Decoding at 64kbps ...

Страница 37: ...P300H P300 Series Modem Installation and Operating Handbook Page 37 P300 Modem Series Error Probability versus Eb No Sequential Decoding at 2048kbps ...

Страница 38: ...P300H P300 Series Modem Installation and Operating Handbook Page 38 P300 Modem Series Error Probability versus Eb No 8PSK TCM with without Reed Solomon ...

Страница 39: ...P300 Modem Series Error Probability versus Eb No 1 st Generation Turbo Codec P300H P300 Series Modem Installation and Operating Handbook Page 39 ...

Страница 40: ... 1 00E 05 1 00E 04 1 00E 03 1 00E 02 0 1 2 3 4 5 6 7 8 9 10 EbNo BER Rate 7 8 Spec Limit Rate 3 4 Spec Limit Test Conditions FEC Turbo Rate 2048 kbps QPSK Tx 70 000 MHz Rx 70 000 MHz Scrambling Normal Turbo Input Level 45 dBm Rate 1 2 Spec Limit P300H P300 Series Modem Installation and Operating Handbook Page 40 ...

Страница 41: ... 06 1 00E 05 1 00E 04 1 00E 03 1 00E 02 0 1 2 3 4 5 6 7 8 9 10 EbNo BER Rate 7 8 Spec Limit Rate 3 4 Spec Limit Test Conditions FEC Turbo Rate 2048kHz 8PSK Tx 70 000 MHz Rx 70 000 MHz Scrambling Normal Turbo Input Level 45 dBm P300H P300 Series Modem Installation and Operating Handbook Page 41 ...

Страница 42: ...adise products this unit is fitted as standard with an interface that is AN INTEGRAL PART OF THE MODEM main board DO NOT TRY TO REMOVE THE CARD Customer specific interface options are available but these require the standard interface to be snapped off and a connector soldered to the board before the modem can accept other standard Paradise interface cards Note if fitting the additional G 703 opti...

Страница 43: ...tion again just press the ÇÛÍ Key ie you don t have to reselect the same option to get past the menu just press ÇÛÍ Options displayed with a colon eg 1 Status switch to another screen or subsequent menu but do not affect operation Options displayed with a equals sign eg 1 Off change the configuration and may if changing a relevant parameter affect the traffic Reselecting a current option or pressi...

Страница 44: ...eature controlled by a front panel entered Feature Code or a feature requiring a hardware option as per this example Some items require not only the feature to be available in the modem but also the feature to be currently active before they are displayed For example the option to raise a deferred alarm if the distant Eb No falls below a certain level shown on the diagrams as DISTANT Eb No Option ...

Страница 45: ...P300H P300 Series Modem Installation and Operating Handbook Page 45 6 2 1 Menu Structure Sheet 1 7 Main Status Change ...

Страница 46: ...P300H P300 Series Modem Installation and Operating Handbook Page 46 6 2 2 Full Menu Structure Sheet 2 7 Main Monitor Info ...

Страница 47: ...P300H P300 Series Modem Installation and Operating Handbook Page 47 6 2 3 Full Menu Structure Sheet 3 7 Main Log Test Setup Action Help ...

Страница 48: ...P300H P300 Series Modem Installation and Operating Handbook Page 48 6 2 4Full Menu Structure Sheet 4 7 Main Change User Opt Operation ...

Страница 49: ...P300H P300 Series Modem Installation and Operating Handbook Page 49 6 2 5 Full Menu Structure Sheet 5 7 Change Tx ...

Страница 50: ...P300H P300 Series Modem Installation and Operating Handbook Page 50 6 2 6 Full Menu Structure Sheet 6 6 Change Rx ...

Страница 51: ...P300H P300 Series Modem Installation and Operating Handbook Page 51 6 2 7 Full Menu Structure Sheet 7 7 Change BUC LNB ...

Страница 52: ...cessible from each other with the Ë and Ü keys The available status screens are summarised in the following diagram The operator has the option to display either the Configuration Summary Screen shown first above or the Traffic Status Summary Screen shown second above when Status is selected from the main menu The selection between screens is made under Ý ô Ë óÑ ô Ü These screens are now each disc...

Страница 53: ...age has occurred CARR Mute 1 1 Muted by 1 for 1 logic CARR Mute Ext Muted by external signal on alarms connector CARR Mute RTS Carrier set to RTS controlled and interface RTS line is off CARR Mute Flt Muted due to an internal fault eg synthesiser lock CARR FAULT There is a fault in the carrier on off logic disconnect the carrier from the satellite Demod status Not Locked If the demodulator is unlo...

Страница 54: ...ever still available by pressing the Down key from the Unit Fault Message On each successive press the screen cycles through the following three screens until on the fourth press it returns to whichever of the two Status Screens has been selected as the default DETAILED RECEIVE TRAFFIC STATUS Status Traffic Summary Screen Pressing down again selects the Transmit Detailed Traffic tatus This screen ...

Страница 55: ...mposite Eb No including framing overheads as used by INTELSAT when specifying modem performance figures The BER is the final USER BER which is being passed to the customer The Offset is the measured error of the received carrier relative to the nominal position expected which is useful for determining the frequency drift due to the satellite and frequency conversion equipment The Level is the leve...

Страница 56: ... simply a convenience for the operator if there are configuration difficulties The Setup Check takes several seconds to run and displays a message when the process is complete ÓÛÓÑÎ ÛÍæ ÍÌÑÎÛô ÎÛÝßÔÔ and ÛÎßÍÛô which allows access to the configuration memories of the Modem The current configuration can be stored another recalled or an old stored configuration deleted This provides a fast method of...

Страница 57: ...00 and closed network equipment from other vendors Ý Ò Ð ÛÍÝ adds the lowest possible overhead to the satellite data to provide whatever ESC rate is selected When this mode is selected there is also the option to provide a Backward Alarm facility Closed Net Plus ESC also has the advantage that at rates above 32kbps a synchronous scrambler is used in place of the error multiplying V 35 scrambler us...

Страница 58: ...he modem operates without adding any overhead to the data this is normal Closed Network mode Normal Ý Ò µ adds no overhead to the data and is compatible with other closed network equipment such as the Paradise P200 and closed network equipment from other vendors ÐÔËÍ ÛÍÝ The modem adds the minimum possible overhead to the satellite data down to 1 to support the async ESC rate you set The exact ove...

Страница 59: ...eferred alarm to be raised on this local equipment if the distant end Rx fails for any reason eg local Tx failure or distant Rx failure The proportion of the overhead assigned to the ESC drops slightly 68 to 65 so the overhead may increase marginally to provide the same async ESC rate ÒÑ ÞßÝÕù ßÔÓ No Backward Alarm is sent Tx or received Rx and so slightly more of the overhead is available to the ...

Страница 60: ...e menu dialogue for this continues in section 6 6 6 on page 65 6 6 4 Change Tx Rx Baseband CONTINUOUS Menu Selecting ÝÑÒÌ ÒËÑËÍ ÜßÌß for the baseband interface leads to the following menu Enter the data rate with any leading zeroes required then press YES if the field is incomplete the unit will add the trailing zeroes to avoid having to enter three trailing zeroes when working with rates such as ...

Страница 61: ...ase where the Rx data is to be inserted must be specified Drop TS 1 3 5 17 15 23 Toggle YES Help Change Tx Rx Baseband Drop Insert Timeslot Menu The screen above shows groups of eight timeslots selected 1 3 4 5 17 16 15 23 although any combination is possible The selection system works by toggling timeslots or groups of timeslots into or out of the selection In Ùòéíî mode timeslots are labelled 0 ...

Страница 62: ...essible to downstream equipment unless Rx data inserted over it ÎÛÐÔßÝÛ The Tx data is replaced as follows MSB LSB G 732 Timeslots 01010101 G 732 CAS in TS16 0101 if CAS signalling mode active T1 ESF T1 D4 Timeslots 10000000 Note that in G 732 mode TS0 is never replaced with idle code even if it is part of the Drop selection and Idle is selected If the modem is set for ÝÔÑÍÛÜ ÒÛÌÉÑÎÕ or standard Ü...

Страница 63: ...e Tx Rx Baseband Drop Insert RBS Menu ÒÑÎÓßÔ øÑÎ ÒÑ ÎÞÍ Robbed Bit Signalling RBS is not in operation or can be ignored Óß ÒÌß Ò ÎÞÍ Robbed Bit Signalling RBS is in use with the least significant bit of each timeslot being used for signalling in frames 6 12 D4 or 6 12 18 24 ESF of the terrestrial multiframe When this option is selected the Drop Insert data is treated specially and is placed into t...

Страница 64: ... of N It will indicate as follows to which the operator just answers YES to accept the information TS identity will be maintained over satellite by TS32 Multiframe YES Change Tx Rx Baseband Drop Insert Ident Menu If no signalling CAS or RBS is active and the value of N of dropped and inserted timeslots falls into the category of Odd values of N then it is not possible to maintain the timeslot iden...

Страница 65: ...OTHER Menu If the IDR option is fitted standard on P300 IDR and above then the modem can generate a 64kbps carrier comprising just of two 32kbps ADPCM audio channels or a 128kbps carrier comprising 64kbps data from the main data interface of the modem plus two 32kbps ADPCM audio channels These modes are effectively an emulation of and are compatible with the popular P1348 P1448 voice data mux card...

Страница 66: ...lock In line will be used see interface card details in appendix A for line names Should this clock input fail the Modem will switch to an internal backup clock as used when ÒÌÛÎÒßÔ is selected to maintain the carrier distant demodulator lock and if a framing overhead is active the Backward Alarm Aux and ESC channels ÒÌÛÎÒßÔ The Modem outputs a clock on the Int Tx clock out line see interface card...

Страница 67: ...even if the Tx and Rx rates are different and it will generate the Tx Clock from the incoming satellite clock This works for any combination of rates it does not require the Rx rate to be higher than the Tx or the rates to be in any way related Finally and only for those with inquisitive minds why does it state earlier This option is only of any practical use when the Rx Clocking is set to Í or Í ...

Страница 68: ...entering data can be corrected by using the ÒÑñÐÎÛÊ key On later software if the operator has set the SHF Frequency Ý ÞËÝñÔÒÞ Ì ñÞËÝ ÍØÚ Ú then the BUC Upconverter chain frequency shift is added to the IF range of the modem and the frequency on this edit screen is displayed and entered directly as the final SHF frequency at the antenna 6 6 10 Change Tx Rx Modulator MODULATION Menu Set modulation 1...

Страница 69: ...ential FEC option fitted ÌÝÓ Trellis Code Modulation if the 8PSK TCM feature is available Rate 2 3 only Ì Turbo Product Code FEC if the Turbo option is available Pressing ÇÛÍ accepts the current FEC type and where there is a choice of FEC rates leads onto the FEC Code Rate selection screen Note that 8PSK and TCM must be used together and that for TCM only rate is available For a review of the proc...

Страница 70: ...7 V3 57 V3 57 n a 0 750 Industry de facto 3 4 rate 0 750 4446 V3 40 n a 0 789 Paradise 3 4 rate 3249 4116 6498 V3 40 n a 0 875 Paradise 7 8 rate Low Latency 0 875 450 yes 450 V3 40 n a Note on processing delay Use the data rate before the FEC to determine the delay in milliseconds from the delay in bits For example at 1Mbps using Rate 0 789 Turbo FEC the FEC delay is 6498 1000000 seconds which is ...

Страница 71: ... per byte are in error However when the error rate exceeds the correctable level unlike other FEC schemes which degrade gracefully Reed Solomon fails dramatically Once the error correction threshold is passed eg 8 errors in our example block the codec considers it uncorrectable and passes the block uncorrected ie the error rate goes from 0 to no error correction in one step There is a small transi...

Страница 72: ... 2048 kbps Non TCM eg Turbo Viterbi Sequential or No FEC IDR 1544 kbps 225 205 10 4 Other rates IBS or Closed Net All rates 126 112 7 Note When interworking with NEC modems in TCM mode and IBS framing NEC have chosen to use Interleaving depth 4 for all data rates For rates 1544kbps then it will be necessary to select Other and manually select the interleaving as depth 4 ÑÌØÛÎ This option is only a...

Страница 73: ...the configuration of other non standard equipment which leads onto the following menus Toggle Scramblers 1 IBS Off 2 RS N A 3 V 35 On 4 Turbo N A Change Tx Rx Mod Demod Scrambler Custom Menu Pressing ï î í or ì toggles each available scrambler between On and Off Scramblers which are not available are shown as N A Not Available as they are out of circuit eg Reed Solomon scrambler when RS is Ѻº Thi...

Страница 74: ...s set to ÐÑÉÛÎ ÞÎÛßÕ ÓËÌÛ when ÍÛÌËÐóÝØÛÝÕ is requested 6 6 15 Change Tx Modulator POWER LEVEL Menu This is the normal menu for the P300 and P310 L Band modem An alternative menu is displayed when operating in Terminal mode with a Paradise BUC Set Tx Power 15 3dBm enter value YES or to change Change Tx Modulator Power Menu Normal This menu allows control of the Transmit output power This may be va...

Страница 75: ... equipment the Tx Spectrum Invert option reverses the ordering of the pairs of Tx data symbols from the FEC encoder to the modulator The Normal option is compatible with other manufacturers BPSK equipment The Invert option ie reverse pairs of Tx symbols is compatible with earlier Paradise products such as the P200 which we consider to have the correct symbol pairing On the Rx path the symbol pairi...

Страница 76: ...el to collect Eb No information from the distant modem but in addition it varies the Tx power within the constraints provided to maintain a specified distant Eb No ÍÛÔÚ ÓÑÒ This It is ONLY used in Tx only applications typically point to multipoint to attempt to maintain the Eb No at multiple Rx only stations It requires the modem to be able to receive the its own carrier via satellite not by any f...

Страница 77: ...This facility only exists so if as a condition of being able to use AUPC the satellite operator has asked you to provide a reduced power in particularly good atmospheric conditions at your geographic location This may be in an attempt to balance out any increase in power required for other locations where there may be poor atmospheric conditions with the AUPC in those locations requiring additiona...

Страница 78: ...e tolerance window This It is to prevent the AUPC continuously adjusting the power to compensate for minor normal Eb No variations When the monitored Eb No moves outside the tolerance window the AUPC will attempt to restore it back to the target value ie not just back inside the tolerance window again 6 6 24 Change Tx Modulator AUPC CARRIER LOST ACTION Menu Set AUPC power on carrier lost Nominal 1...

Страница 79: ... possible and the Aux channel is not available so the Ü º option is not required and is not offered ßÍÇÒÝ ÛÍÝ When the ESC port is set for async operation this selection configures the async character format and Baud rate ÒÌÛÎÚßÝÛÍ Set the electrical interfaces for each port for the ESC port control if it is directly internally linked to the M C port for distant end M C ßËÜ Ñ ÔÛÊÛÔÍ Set the levels...

Страница 80: ...cond requires 9 x 960 sync bits per second to convey unfortunately 8 64kbps above the 8kbps channel capacity and so characters will be lost At 9600 Baud with 9 bits char ie 8 plus parity there are 872 async characters per second 9600 11 start 8 bits parity stop 872 async characters per second requires 9 x 872 sync bits per second to convey 7 85kbps and so no characters will be lost over the 8K ESC...

Страница 81: ... ESC connector cannot provide a synchronous interface If selected the Aux port operates synchronously and varying amounts of the IBS overhead may be allocated to the sync Aux channel The sync channel may utilise at up to a total of 21 32nds of the overhead which with Standard IBS SMS this allows the Aux port to operate up to 4 375 of the main data port rate The selection of the overhead available ...

Страница 82: ...ail o h after Aux Change Tx Rx ESC Aux BA Define IBS ESC usage Menu Ðîíð ÝÑÓÐù The standard 20 32nds of the overhead is allocated to the ESC and this is compatible with earlier products such as the P230 P230D I and P1300 P1361 combination The overhead allocated to the ESC is TS16 TS32 bits 5 8 and TS48 TS32 bit 1 is not used as this is reserved for the INTELSAT low rate ESC on the Aux port if so c...

Страница 83: ...BA Define IBS ESC Aux Custom 1 O h use 1 TS0b1 XXX 2 TS32b1 XXX 3 TS32b3 XXX 4 TS32b4 XXX Back Help Change Tx Rx ESC Aux BA Define IBS ESC Aux Custom 2 Each of the XXX fields can display the following uses for that part of the overhead and be toggled between the differen ssing the appropriate numbered key t uses by pre ed ort ÓÚÉ In use for the TS32 Multi Frame Word TS1 n use they TS3 32nds overhe...

Страница 84: ...tinuous rate the ESC channel will support the ESC channel must be set to a standard async Baud rate equal or below this figure using the Async ESC menu selection The Aux Sync Rate is the data rate of the Aux port A DPLL generates this clock however obscure the rate The Aux async Baud is the maximum Baud rate that could be conveyed through this Aux channel if the Aux clock is ignored and the Aux po...

Страница 85: ...nd 3 4 or 5 to select No parity Even parity or Odd parity respectively Note that as described in the last paragraphs shortening the async character reduces the maximum continuous Baud rate as the ESC channel is limited to a finite character rate per second and the more bits in each async character the higher the effective Baud rate allowed without exceeding the ESC channel character rate limit 6 6...

Страница 86: ...emote M C port It must be set specifically for the end of the link the modem is located at When either of these options are selected the physical ESC port is disabled as it is linked internally to the M C port ÔÑÝßÔ Incoming messages on this modems remote M C port Rx lines from the M C Master device are routed directly to the Tx ESC channel and out over the satellite link Messages from the incomin...

Страница 87: ... IDR modes for the Audio ESC channels but may also be used when generating a 64kbps IBS carrier comprising of 2 x 32kbps ADPCM audio channels only or a 128kbps comprising of 2 x 32kbps ADPCM audio channels plus 64kbps from the main data port Press 1 or 2 to select which channel then use the Ë and Ü buttons to vary the level Pressing the up down keys slowly rapidly causes the level to change in 0 1...

Страница 88: ... carrier we are receiving does not correspond to the destination allocated backward alarm channel 1 The Rx fail signals from the modems receiving the carriers from all the other destinations including this modems Rx fail signal must be externally patched into the corresponding external backward alarm inputs ßÛÛÛ Alarm 1 is internally connected to the Rx Fail signal alarms 2 4 are available for ext...

Страница 89: ...weep control Note that setting Rx Tx even momentarily copies the Rx parameters which track the Tx to the Rx configuration Toggling this option on then off again provides a convenient way to copy the Tx config to the Rx except the IF frequency should this be required at any point The Change Rx menu then will have different options showing depending on whether Rx Tx mode is active Rx Tx Disabled Rx ...

Страница 90: ...use the satellite clock or a station clock to drive the clock to the terrestrial equipment use Ù ÔÑÑÐ ÌÛÎÎ The PCM bearer at the input to the Drop Mux is looped to the Insert Mux If this bearer should fail no clock or AIS the modem will switch temporarily to Ù so that the Rx traffic is not lost as a result of a Tx fault When set for Ô Ì the Rx Clocking menu asks for the selection of the clock sour...

Страница 91: ... 1 x 64kbps incoming The screen is then displayed Sat TS 1 3 10 12 Toggle YES Change Rx Baseband Insert Mux Partial Data Select Menu On this screen the data for this destination is selected from the total receive data The incoming data from the satellite is labelled as timeslots 1 N NOTE this labelling bears NO RELATION to the terrestrial timeslots from which the data was dropped at the Tx site It...

Страница 92: ...em will use it in preference to its internal frequency reference for clock generation of any backup clocks required See the notes in the Rx Clock section on the following page as to where the modem sources the Rx clock from under fault conditions The station clock frequency can be any integer multiple of 1kHz and the 75 BNC will accept any sinusoid 0dBm or a square wave 1Vp p eg G 703 Para 10 sync...

Страница 93: ...erates a backup bearer onto which to insert the Rx data Note that this screen does not display a Ì option as it is the failure of the Tx bearer input which causes this backup clock to be used in the first place Rx o p bearer backup clk 1 Sat 2 Internal 3 Station Change Rx Buffer Clocking Rx Clock Insert Loop Menu All the options available on any of these menus for the Rx output clock are as follow...

Страница 94: ...he Rx PLL converts the Station Clock to the correct rate to drive the Rx data towards the terrestrial Should the Station Clock fail then the modem will switch to the internal frequency reference in order to maintain the Rx traffic Again the buffer should be set large enough to accommodate the difference between the Station Clock and the incoming satellite clock PLUS the Doppler shift whilst provid...

Страница 95: ...d to OK This takes advantage of any outage and ensures the buffer is centred every time normal operation begins This option is available under ÝØßÒÙÛô ËÍÛÎóÑÐÌô ÑÐÛÎßÌ ÑÒô ßÝÌ ÑÒÍô ÞËÚÚÛÎ ßËÌÑ ÝÛÒÌÎÛ This option can be disabled as for minor outages the errors or sync losses caused by centering the buffer may be larger than those caused by the outage In normal operation the buffer fill state can be...

Страница 96: ... Rx Tx active Change Rx Demod Menu Rx Tx Active Each of this is now discussed in turn referring back to the Tx path screens where operation is identical 6 7 8 Change Rx Demod IF FREQUENCY Menu See Change Tx Rx Modulator IF Frequency Menu on page 68 6 7 9 Change Rx Demod MODULATION Menu See Change Tx Rx Modulator Modulation Menu on page 68 6 7 10 Change Rx Demod FEC Menu See Change Tx Rx Modulator ...

Страница 97: ...ipment Please note the following 1 Increased sweep width proportionally increases the carrier acquisition time 2 With low data rates and wide sweep widths ie wider than the recommended carrier spacing it is perfectly feasible to acquire the wrong carrier Typically low rate carriers are clustered together on a transponder and the modem has no way of telling which carrier is which other than it has ...

Страница 98: ...lue of offset frequency from the Demodulator Detailed Status screen in order to adjust the Rx IF frequency 6 7 15 Change Rx Demod AUPC Menu This screen provides the option to enable or disable the Remote Reporting facility used with AUPC to enable a distant end modem to report it s Eb No and BER back to the other end of the satellite link The facility can be either On or Off See AUPC in section 8 ...

Страница 99: ...specific faults they can monitor in the case of the 64 kbps G 703 interface it is the incoming octet timing or options on the outgoing signal supply outgoing octet timing or not Control over such parameters is provided here 6 8 1 Change Terr intfc ELECTRICAL With the standard P1440 RS422 V 35 RS232 and optional G 703 interface the following menu is shown it may vary if other interfaces are used Th...

Страница 100: ...e line code is set incorrectly you will almost continuously see Tx Warn Tx line code violations detected which indicates the modem is receiving line code violations and most probably set for AMI but receiving a B8ZS HDB3 coded signal Intermittent occurrences of the warning however are more likely to be caused by line noise corrupting the signal Note that if the modem is incorrectly set for B8ZS HD...

Страница 101: ...Î and the RTS line is set to ÙÒÑÎÛ then there will be no alarms should the RTS line go off inhibiting the carrier This final screen is only shown if the modem is fitted with a DTE interface Line CTS Terr accepts Rx output 1 Ignore 2 Active Change Terr Intfc Control Lines Active Screen 3 6 8 3 Change Terr intfc CARD SPECIFIC These screens are used for interfaces which have interface specific requir...

Страница 102: ... Service Factory Parameters Remote M C Menu ÌßÕÛßÉßÇ When selected the operator can switch between Local and Remote control at will using the Ô Î options on the Change Rem M C Menu Ù ÊÛßÉßÇ When selected a subsequent screen is displayed which allows a timeout of up to 255 seconds to be specified Normal switching between Local and Remote is then by Giveaway philosophy ie once in Remote M C local co...

Страница 103: ...ote control is only possible if the protocol is not Ѻº and control has been selected as Î on the Change Remote M C menu ÒÌÛÎÚßÝÛ The options available here are RS232 or RS485 RS232 is only usable for a direct connection between a single device and a PC RS485 is required when more than one slave device is connected to the remote M C bus Again see the Remote M C section for complete details of the ...

Страница 104: ...ÚÛÎ ÍÔ Ð The operator may also instruct the modem to raise the deferred alarm if the interval between buffer slips is less than a preset threshold The threshold is set in hours and may be for example set to 960 hours 40 days or 1728 72 days to warn if the criteria for clock accuracies for a specific service are not being met Ü ÍÌßÒÌ Û ñÒ If the AUPC feature is active in either Maintain Eb No or Mo...

Страница 105: ...AIS the Alarm Indication Signal all ones INTELSAT specify the required actions as the Prompt Traffic alarm should be raised AIS should be regenerated to prevent multiple noisy links building up enough errors to stop the all ones being detected and the backward alarm should be sent In continuous modes this option allows all three actions to be disabled In Drop Insert modes the Prompt Traffic alarm ...

Страница 106: ...he estimate of the BER from the terrestrial port at the input to the insert mux may be selected as described above for the Tx Drop BER Default ß 6 10 5 Change User Opt Operation Terrestrial PCM BEARER CRC Menu PCM Bearer 1 Bearer CRC 2 E Bits 3 CRC Frame Acq Change User Opt Operation Terrestrial PCM Bearer CRC Menu ÞÛßÎÛÎ ÝÎÝ This option only applicable to G 732 Drop Insert bearers selects if the ...

Страница 107: ...his mode the overhead is varied to accommodate any ESC requirements and if the ESC and main data rate are very low the overhead multiframe structure might be very long Whenever the Rx carrier is re acquired the multiframe alignment also has to be re acquired and this option allows the maximum multiframe period to be specified in order to prevent excessively long multiframe periods affecting carrie...

Страница 108: ...satellite via a thin route ie less than the full PCM bearer using Drop Insert If enabled the following features of the PCM system appear transparent end to end AIS all ones Backward Alarm CAS Backward alarm G 732 only NOTE When enabled AIS is forced over the whole PCM bearer and so this option should not be used with cascaded Drop Insert where AIS from the second modem in a cascade would cause the...

Страница 109: ...splay Menu The options are ÍÌßÌËÍ ÍÝÎÛÛÒ This selection are covered in the section Status Screen Display on page 52 The options available are Ì ú ÎÈ ÌÎßÚÚ Ý ÍËÓÓßÎÇ or ÝÑÒÚ ÙËÎßÌ ÑÒ ÍËÓÓßÎÇ Default Ì ú Î Ì ºº Í ËÐÙÎßÜÛ ÓÛÍÍßÙÛÍ The unit will by default display notes on the LCD typically Note when there is an upgrade option available to add extra facilities at this point in the menu structure At su...

Страница 110: ...s such as Tx Rx Frequency Offsets which allow the IF frequencies to be entered and displayed as final SHF frequencies are also relevant and useful on the standard 70MHz 140MHz P300 Each option is described in the following paragraphs 6 12 1 Change BUC LNB TX BUC Menu Tx BUC 1 BUC Type 2 DC References 3 SHF Frequency 4 SHF Power Units 5 BUC Control Change BUC LNB Tx BUC Menu fewer option when not L...

Страница 111: ...ift None Modem IF limits around user set SHF Frequency Shift Other Modem IF limits around user set SHF Frequency Shift Std Ku 14 000 GHz 14 500 GHz 13050 MHz Ext Ku 13 750 GHz 14 250 GHz 12800 MHz Std C 5 800 GHz 6 4250 GHz 4900 MHz INSAT C 6 725 GHz 7 025 GHz 5775 MHz PALAPA C 6 425 GHz 6 725 GHz 5475 MHz The difference between Ò and Ñ is that with Ñ the operator can configure the modem to supply...

Страница 112: ...vide future fine adjustment range Initial power adjustments must be made off satellite The measured BUC power can be viewed using Ó ÞËÝ ÌÛÎÓ ÒßÔ The Modem takes control of the BUC to act as an integrated terminal and the two together respond as follows The modem IF output level screens are replaced by a screen allowing the operator to set the output power at the BUC flange The Modem continuously r...

Страница 113: ...nt drawn by the BUC and to raise an alarm Tx Fault if it goes outside a user defined window Two subsequent screens allow the user to independently set the low and high current alarm thresholds The current being drawn by the BUC can be monitored from the Ó ÞËÝ menu s 6 12 4 Change BUC LNB Tx BUC SHF FREQUENCY Menu This screen is available on both 70MHz 140MHz P300 modems and P310 L Band modems and ...

Страница 114: ...p the power measured at the BUC constant 6 12 6 Change BUC LNB Tx BUC BUC CONTROL Menu This screen is only available on the P310 L Band modem if the BUC Type has been set to a known Paradise BUC the modem has the FSK communications option and the Modem BUC are set in mode In the alternative Ì mode with Closed loop power control to the BUC flange the BUC is kept Ñ and the BUC attenuator automatical...

Страница 115: ... Modem IF limits around user set SHF Frequency Shift Std C 3 635 GHz 4 200 GHz 5150 MHz Std Ku 10 950 GHz 11 450 GHz 10000 MHz 10 95 11 7G 10 950 GHz 11 700 GHz 10000 MHz 11 2 11 7G 11 200 GHz 11 700 GHz 10250 MHz 11 7 12 2G 11 700 GHz 12 200 GHz 10750 MHz 12 25 12 75G 12 250 GHz 12 750 GHz 11300 MHz As with the BUC s the difference between Ò and Ñ is that with Ñ the operator can configure the mod...

Страница 116: ...s the modem to be set to display and edit the final SHF frequencies instead of the IF frequencies When the LNB Type has been set to a predefined type ie not Ò or Ñ then this setting is done automatically and the menu option to manually set the frequency shift is not presented Set downconverter freq shift to display edit Rx freq at antenna Yes 1 Yes 2 No Change BUC LNB Rx LNB SHF Frequency Menu 1 I...

Страница 117: ...exceeds the stability of the reference option fitted to the modem viewable under º Ì Ë 6 13 MONITOR MENU Monitor 1 Demod performance 2 Terrestrial BER 3 Carrier IDs 4 Distant Eb No BER 5 AUPC 6 BUC Monitor Menu Each of these options is now discussed in turn 6 13 1 Monitor DEMOD PERFORMANCE Menu Eb No 10 3dB To FEC 6 8E 4 To RS 7 8E 7 FAW BER 1 0E 12 Final BER 1 0E 12 RS Monitor Demod Performance M...

Страница 118: ...y be changed by pressing 1 or 2 The dialogue is exactly the same as described in section 6 10 3 on page 105 6 13 3 Monitor CARRIER ID s Menu This screen is only available if the receive service supports the transmission of the three identity bytes in the TS32 Multiframe This includes IBS SMS modes Closed Net Plus ESC modes above 32kbps and Custom IBS modes with a TS32 multiframe Rx ID s carried in...

Страница 119: ...ower 1 5dB Monitor AUPC Menu The down arrow indicates that a subsequent screen shown below shows the limits the AUPC has been constrained to work under Limits 3 5 1 0dB Slew 10dB min Comms lost action Nominal Monitor AUPC Limits Menu Most of this is self explanatory except for the slew rate limit which limits the rate of change of Tx power it moves on 0 1dB steps at the appropriate rate to match t...

Страница 120: ...nterfaces fitted to the equipment ÍËÐÐÔ ÛÎ This screen together with screens accessed by the down arrow give the manufacturer with contact fax and phone numbers and e mail addresses Ê ÛÉ ÝÑÒÚ Ù This screen allows the configuration of the modem to be displayed After selecting between Tx Rx Interface Common and Remote M C subsequent presses of the down arrow display every parameter in that group ÌÛÎ...

Страница 121: ... allows the operator to view print or clear the internal 1000 event traffic log The ß option allows the operator to have certain parameters added to the traffic log at regular intervals The traffic log is a circular store of 1000 locations events not viewed or printed are lost after 1000 subsequent events The options are as follows Ê ÛÉ This allows the log to be viewed on the LCD The Up Arrow and ...

Страница 122: ...gable events on and off N indicates No the data will not be logged Y indicates Yes the data will be logged Pressing the key corresponding to each data type toggles between Y and N More options are available on subsequent screens Autolog Y N 1 BERT BER N Back 2 Tx Terr BER N 3 Rx Terr BER N More Log Autolog Measurements Menu 2 Finally if AUPC is active see AUPC in section 8 11 on page 156 another s...

Страница 123: ...m is used with separate Drop Insert bearers by the use of a twin G 703 terrestrial interface The method of BER measurement can be selected by Ý ô Ë óÑ ô Ñ ô Ì ô Î ñ ÞÛÎ ßËÐÝ ÜÛÔÌß ÐÑÉÛÎ This logs the power variation delta power the AUPC has used to maintain the target Eb No See AUPC in section 8 11 on page 156 for further details This is useful in case the satellite operator requires you to determ...

Страница 124: ...light on the firebird come on your looking in the wrong place its not the modem try the cables For the remote loopback to function when this loopback is selected the clocking must be configured in a mode where it would work if the loop were made in the cables Rx clocking must be set to something other than Ì Ý µ switch to Satellite if this is the normal setting and the Tx clocking must the set to ...

Страница 125: ...continues to be transmitted and the Rx data from the satellite is ignored ESC Aux channel data which is present in the data stream at the Framer output is also looped ÎÍ øÔ The data is looped after the Reed Solomon Encoder interleaver back into the RS Deinterleaver decoder providing a local loop only The Tx data continues to be transmitted and the Rx data from the satellite is ignored ESC Aux chan...

Страница 126: ...made by the RS decoder to be inhibited without the removal of the RS overhead This allows the true effect of the Reed Solomon codec to be seen without data rate changes which would affect Eb No and therefore the error rate 6 16 3 Test PSU S TEMP Menu PSU 5V 15V 15V 5V Temp Status 97 98 102 98 46C Test PSU s Temp Menu Power supply monitoring is only available if the Monitor AGC option is fitted If ...

Страница 127: ...run continuously using a 1 minute sliding window When Auto Logging of the BER Tester results is enabled the tester executes a test for the user set BER Auto Log period 1 9999 minutes and records both the average and 1 second worst case BER s in the traffic log of the modem at the end of the period It then automatically re starts a new test for the following period It may operate independently or i...

Страница 128: ... which to carry them Closed Net Plus ESC Closed Net Plus ESC mode is only available if the Async ESC feature is available standard on P300 IBS and above The ESC channel Baud rate is used to determine the overhead added to the main data allowing the minimum possible overhead to be added ie the minimum bandwidth to be used to provide the Async ESC Baud rate required When the ESC channel is used for ...

Страница 129: ...ne 32kbps ADPCM audio ESC channel or 64kbps in place of both audio ESC s This provides a very useful channel rate for BER testing Custom Framing Custom Framing mode is only available if the Custom Features feature is available standard on P300 TCM Custom framing is based on either IBS or IDR formats and custom framing provides the following advantages Based on IBS A variable overhead may be added ...

Страница 130: ...le AUTOLOG of PRBS results is active YES is displayed To be able to manually select the BERT mode auto logging of the BER result must be disabled by either setting the Autolog period to zero Main Log Autolog or by clearing the flag requesting it to log the BERT results on the subsequent Autolog screen ÑÒÛ Ó ÒËÌÛ One Minute sliding window mode displays the average BER over the last 1 minute It does...

Страница 131: ...s 999 999 then the test will stop and the results will be frozen See Note 1 below Time The cumulative test time displayed as seconds to 1 minute then decimal minutes to 1 hour then decimal hours to a maximum of 27 7 hours BER The calculated BER over the entire duration of the test ie average over test period It is displayed as follows When there are more than 100 errors the exact BER is displayed ...

Страница 132: ...s for the main data channel itself You would probably agree that the result would be no different if the PRBS content was dropped to say 4 of the main data channel implying that reducing the bits available to measure the BER by 20 will have no effect on the validity of the BER reading The argument for the Internal BERT is no different 99 9 of the bits available for BER measurement are used with th...

Страница 133: ...ce Main 9 1 1 will kill the Tx carrier whatever screen was left active on the display NOTE This is an OFF only selection to switch the carrier on again you must use the normal sequence Change Tx Mod Carrier On Although 911 is available in both local and remote M C access to the normal carrier on off control is only available under local control So if a unit is set for remote control either the car...

Страница 134: ...be activated if ever the internal temperature reaches within 3 degrees Centigrade of the operating limits of 0C and 60C Should the internal temperature exceed the limits of 0C and 60C then a Unit Fault Prompt Alarm is activated The Tx carrier is muted outside the operating temperature range 6 20 2 Service FACTORY PARAMETERS Menu Factory 1 Serial 01564 2 Debug 0 3 RemCont Giveaway 120s 4 Watchdog S...

Страница 135: ...e any ESC requirement at any data rate ÜÎ This leads to variants on standard IDR framing again explained later which allow for operation With overheads of 96 64 or only 32 kbps With 16kbps ADPCM on the audio channels instead of 32kbps allowing either all normal IDR features in a 64 kbps overhead or again utilising 16kbps ADPCM 96 kbps overhead with all normal IDR features but including a 32kbps sp...

Страница 136: ...ward Alarm facility or the TS32 Multiframe has been disabled then this menu is skipped IBS Backward Alarm 1 Normal single 2 Four independent alarms Change Tx Rx Service Custom IBS Back Alm mode Menu ÒÑÎÓßÔ A single backward alarm operates as normal ÚÑËÎ ßÔßÎÓÍ The modem transmits or receives four independent backward alarms using the form c outputs and backward alarm inputs normally used for IDR o...

Страница 137: ...is stated here as a reminder As the exact overhead format is calculated based on your ESC requirement for two Modems to calculate the same overhead usage and therefore interwork the following parameters must be the same at both ends of the link Main Data Rate ESC async character format bits parity Baud rate Proportion of overhead assigned to ESC Baseband mode ie continuous or Drop Insert 7 1 3 Cha...

Страница 138: ...The 32kbps for FAS Back Alarms 8K sync ESC channel alone is transmitted 16k Modes çêÕ Both Audio ESC channels operate in 16kbps ADPCM mode allowing both audio ESC s to fit into 32kbps The 32kbps for FAS Back Alarms 8K sync ESC channel is transmitted first followed by 32kbps defined for Audio ESC 1 now containing both Audio ESCs 1 2 using 16kbps ADPCM These are followed by the 32kbps for Audio ESC ...

Страница 139: ...31 x 64kbps This is referred to as 1920kbps or 1984kbps operation in the service definitions but the data rate at the terrestrial port is actually 2048kbps When selected instead of the unit inserting extra IBS SMS framing on to the data ie 6 7 it uses the similar G 732 framing already present 0 Some locations in the G 732 framing are changed over satellite such as TS0 Odd bit 4 which is used by th...

Страница 140: ...eeds data for each location in contiguous timeslots If Î ó is selected a timeslot edit screen is displayed as follows TS order 0 17 31 16 15 1 Toggle YES Help Change Tx Rx Baseband Cont 2048k IBS G 732 Re order Menu This screen allows the operator to change the order of the transmitted timeslots The screen above shows groups of timeslots 1 15 and 17 31 swopped in location with 1 15 also reversed 1...

Страница 141: ... receive equipment to re order the timeslots if so set Other than aligning the terrestrial frame within the satellite IDR frame the Tx data is unaffected ÌÈ ÌÍ ÎÛóÑÎÜÛÎ This selection leads onto a screen identical to that for IBS G 732 re ordering as described in the last screen shot and paragraphs of the previous section which allows the timeslots to be arbitrarily re ordered prior to transmissio...

Страница 142: ...re than one clock in the system and a buffer is required to absorb the difference between the two clocks Typically data is placed into the buffer with one clock and removed with another thus causing a gradual continuous filling or emptying of the buffer causing slips on a regular basis The period between buffer slips when it is totally full or empty will be constant and proportional to the differe...

Страница 143: ...ere is no Plesiochronous effect with a clock loop The Buffer size required depends on the satellite orbit or rather the accuracy with which it s position is maintained currently 2ms end to end buffering is enough for the Doppler shift from 1 satellite hop on current INTELSAT satellites For 2 x Doppler shift 4ms is required Set the Tx Rx Clock modes as follows to use the clock listed Clock from the...

Страница 144: ...ou are implementing then you are welcome to contact us by fax for advice for your exact application 8 2 3 Determining Buffer Size Use the following calculation to determine the buffer size required for any application If Lc is the local clock accuracy e g 1 x 10 9 and Rc is the remote clock accuracy e g 1 x 10 11 and Ms is the Minimum slip period in days e g 40 days then the required Plesiochronou...

Страница 145: ...h of the four sites transmits a 1152kbps 3 x 384kbps carrier and all four destination sites receive the three carriers from the other destinations At each site all three modems are configured for Rx Partial Insert and the data for all but this site is discarded leaving a 384kbps to be inserted onto the looped T1 bearer by each Rx modem In this way the data from each site for this destination can b...

Страница 146: ...e of t so this intermittent reduction in error correcting capability is minimised Note that in theory error correction codes 100 90 5 and 200 180 10 are equivalent they can correct 5 bytes in 100 and 10 in 200 respectively but the effect of the interleaver synchronisation words will be more noticeable equivalent to a loss of t 1 when t 5 20 loss as opposed to t 10 10 loss On the negative side the ...

Страница 147: ...ch the modem can operate correctly The Symbol Rate range however is not of initial interest to most modem users as they first need to know if the modem can operate at the terrestrial Data Rate they require This section briefly explains the relationship between Data Rates and Symbol Rates The Data Rate is normally the frequency of the clock used on the terrestrial port however if Drop Insert is act...

Страница 148: ...tain the timeslot ID for an Odd value of N or if RBS signalling is active then only 7 out of 8 of every TS16 are available for ESC as TS16 has to carry the CAS MF unique word or pack byte every 8th frame In this case simply consider TS16 as providing 7 bits of overhead not 8 For Custom IBS modes this is unchanged unless Minimum Overhead mode is selected in which case the overhead will vary up or d...

Страница 149: ...moderately complex and relies on many different parameters For other mixes of data rate and async settings the simplest way to determine the overhead is to enter the parameters into a modem and then select Info View Config Tx A screen such as the one shown below is displayed as the second or third screen accessed by Down Arrow This screen shows the exact overhead percentage as well as the Framed d...

Страница 150: ...overhead used relates directly to the data rate ESC backward alarm settings then for two modems to interwork the following parameters must match on both modems Main data rate Async ESC Baud Rate and Character length Parity Backward Alarm option ie both enabled or both disabled Baseband modes ie both Continuous Data or both Drop Insert A Closed Net Plus ESC facility as described above using the Cus...

Страница 151: ... pair of modems then the modems will not talk to each other as they calculate different overhead percentages to accommodate the Async ESC channel the symbol rates do not match and hence they will not communicate However once the overhead reaches the 0 39 minimum changes to the ESC configuration do not change the overhead percentage it is already at minimum and the modems will communicate with mism...

Страница 152: ...ot use a CAS multiframe and will be compatible with other manufacturer equipment with the same number of timeslots selected 8 Configure the receive path similarly if Î ãÌ is active then only the timeslots need selecting Note the P300 Modem equipped with the Extended D I feature standard on P300 TCM can support any value of N not just N 1 2 3 4 5 6 8 10 12 15 16 20 24 30 as listed for the SDM300 E1...

Страница 153: ...ltiframe YES and the setup is complete 7 If you have selected an Odd value of N the unit will prompt TS Identity over satellite 1 Normal maintain 2 Don t maintain If you select Ò ø the unit will provide TS identity maintenance for any value of N by using a CAS multiframe If you select Ü ù Ó then the Modem will not use a CAS multiframe and will be compatible with the same number of timeslots select...

Страница 154: ...he two differing V 35 camps schematic written description was a background pattern dependent error rate in the order of 1 x 10 8 Note that as the background error rate is pattern dependent there is no guarantee you will see it with regular test equipment such as Firebirds etc which generate repeated fixed patterns In most satellite communications such a background error rate might be masked by the...

Страница 155: ...ment Scramblers in the columns below are determined to be equivalent Paradise P300 Series Modem CCITT INTELSAT FDC Linkabit Paradise P200 series closed net BPSK requires P300 Tx Spectrum invert Scrambler on Paradise P230 IBS SMS Uses synchronous IBS scrambling so V 35 type not an issue FDC SM290 SM2900 Viterbi V 35 FDC Link FDC SM290 SM2900 Sequential Link FDC V 35 SSE SM3000 4000 Viterbi V 35 FDC...

Страница 156: ... local modem needs to be able to interrogate the distant modem and request the current Eb No value It does this by sending messages through the asynchronous ESC channel which is carried over the satellite multiplexed with the main data channel For AUPC to operate an async ESC channel must be defined and on the P300 Series this is available in Closed Network Closed Net Plus ESC IBS SMS and IDR mode...

Страница 157: ...target Eb No the Tx power adjustment will only be automatically et along with a slew rate limit if it is felt that additional limits one of three sc Limits red to maintain the Eb No Limit only v reactivated when the Eb No tolerance is again exceeded Separate upper and lower Tx power limits are s limits to prevent rapid power variations are required By manipulating the upper and lower power enarios...

Страница 158: ...pheric changes affecting the multiple distant downlinks Í º Ó mode requires no pow AUPC is active in normal Ó ù Û ñÒ or self monitor Í º Ó modes then the status of the n be recorded regularly in e traffic log using the Autolog feature Ý ô Ô ô ß The AUPC delta power can also be starting on page 207 ds primarily on two factors The user specified slew rate w regularly the distant Eb No is read by the...

Страница 159: ...ace is set to RS485 then the external RS485 interface will be disabled and the C will use 100 of the ESC channel bandwidth to achieve as high an Eb N possible If the ESC interface is s No update rate and percentage of ESC channel bandwidth used is displayed on one screen º ô Ê Ý º ô ÌÈ sequence of screen displays Configuring AUPC for operation the normal levels AND THEN activate the AUPC he modems...

Страница 160: ...to the Eb No requests at the distant modem Set the local AUPC for Ó Ü to determine if it is working correctly If it is then the distant Eb No should be available on the Ó ô Ü screens If the Eb No or BER figures say Unavail then the ESC is changing the AUPC sort out the ESC channel When the distant Eb No is displayed record the distant Eb No under clear sky conditions Then change the AUPC mode to M...

Страница 161: ...e diagram Finally a table provides a quick look up reference to convert values measured on a spectrum analyser to a real Eb No 8 12 2 Derivation of Eb No from C N N It is possible to describe the Carrier Noise ratio within the Rx system at an arbitrary reference point It is common to measure Ideally we are after the Carrier Noise ratio but as we cannot turn off the atmospheric noise we have to mak...

Страница 162: ...t BER performance figures at a specified Eb No you get the same BER performance whether the data is framed or not Adding framing to a Closed Network link would increase the bandwidth decrease the Carrier Noise decrease the displayed Eb No as it does not compensate for framing and therefore degrade the BER However when brought back to the same Eb No you do of course recover the same BER Framing the...

Страница 163: ...P300H P300 Series Modem Installation and Operating Handbook Page 163 8 12 4 Eb No Explanatory Diagram ...

Страница 164: ... 9 0 8 42 9 2 8 64 9 4 8 87 9 6 9 10 9 8 9 32 10 0 9 54 10 5 10 09 11 0 11 5 12 0 12 5 13 0 13 5 14 0 14 5 10 64 11 18 11 72 12 25 12 78 13 30 13 82 14 34 Adjust for modulation BPSK 0dB QPSK 3 0dB OQPSK 3 0dB 8PSK 4 77dB Adjust for FEC Rate 1 2 Rate 3 0dB 3 4 Rate 1 25dB 7 8 Rate 0 58dB 2 3 Rate 1 76dB Adjust for RS Codec n k t 126 112 7 0 51dB 219 201 9 0 37dB 225 205 10 0 40dB 15 0 15 5 16 0 16 ...

Страница 165: ...n and Operating Handbook Page 165 N N C 0 N E N C 0 S 0 N E 0 t 0 N E 0 Dec 0 N E 0 b 0 C N N 8 4dB C N 7 72dB 8PSK so subtract 4 77dB 2 3 Rate FEC so add 1 76dB RS Code 219 201 9 so add 0 37dB Measure Look up Calculate Eb No C N 2 64dB ...

Страница 166: ... connected in parallel All interfaces also have the facility to disable the outputs either by making the outputs high impedance or by relay switching enabling one of a parallelled pair to drive the outputs without line contention In the event of a catastrophic failure such as a power supply etc the switching circuitry which is distributed between the two units will switch over to the operational u...

Страница 167: ... that its outputs are tri state the standby LED on the front and the Hi Z LED on the rear should illuminate on one modem 5 Connect the data interfaces in parallel and configure the two units alike Suitable adapter cables are available from Paradise for all the standard interfaces 6 Connect the two transmit IF ports to the input ports of a suitable power splitter combiner of the correct impedance 5...

Страница 168: ...nnect PC to serial port Press YES ENTER when connected Boot Start Process Menu At this point the serial cable supplied with the equipment should be connected between the PC ands the modems Async ESC connector then the ÇÛÍ key pressed This leads onto the following menu Waiting for communications with PC Press YES ENTER key to abandon Boot Comms Start screen The bar in the top right hand corner spin...

Страница 169: ...orms a checksum test on each bank displaying the results as follows Checksumming main code Banks Boot Flash Checksum screen Finally when the checksums are verified the processor jumps into the new Flash code and begins execution of the latest version of the embedded M C code Should the code fail to execute properly hold down the Ò ñÐ ª key to clear the memory Should the program ever crash or be ot...

Страница 170: ...sible in the field 1 1 OPERATION The standard RS422 V 35 and RS232 interface does not require any resistor packs to be unplugged for 1 1 redundancy operation HOWEVER the G 703 option has a switch to set the mode Normal or 1 1 and the E1 G 703 card a second switch to select 120 75 operation The Normal 1 1 switch on the G 703 option doubles the impedance so you can connect the two in parallel and al...

Страница 171: ...his rate is reduced as the connecting cables extend beyond 10m As an estimate assume the maximum rate halves as the distance doubles ie 5Mbps to 20m 2 5Mbps to 40m etc The input clock data phase is selected automatically reporting a Data Marginal warning whenever it has to switch phase If the modem reports Data Marginal frequently then this is not a modem fault but an indication that you have a cl...

Страница 172: ...d beyond 10m As an estimate assume the maximum rate halves as the distance doubles ie 5Mbps to 20m 2 5Mbps to 40m etc The input clock data phase is selected automatically reporting a Data Marginal warning whenever it has to switch phase If the modem reports Data Marginal frequently then this is not a modem fault but an indication that you have a clocking problem external to the modem ie changing c...

Страница 173: ...ubles ie 50kbps to 20m 25kbps to 40m etc NOTE this is a synchronous RS232 interface if you need an asynchronous interface please contact the factory The input clock data phase is selected automatically reporting a Data Marginal warning whenever it has to switch phase If the modem reports Data Marginal frequently then this is not a modem fault but an indication that you have a clocking problem exte...

Страница 174: ...E1 cards AMI or HDB3 In coded ie non AMI modes the modem will display a Data Marginal warning whenever a line code violation is detected For T1 cards a choice of line lengths is also given to allow the card to pre compensate the T1 signal for line losses If you are in doubt select the 133 feet option no pre compensation Switch Link Settings For T1 G 703 cards set SW2 to Position 2 For E1 G 703 car...

Страница 175: ... SW3 1 Normal Operation TS1 31 Modified SW3 2 TS0 transparent TS0 Bit 1 overwritten with CRC4 SW3 4 TS1 31data inversion TS1 31 bit mask inversion SW3 3 and SW3 4 have no effect if SW3 1 is OFF The card supports the following modes SW3 0 0 0 0 Transparent Card functions as standard Q302 0 1 0 0 Transparent CRC4 As above with CRC4 multi frame in TS0 bit 1 1 0 0 0 TS1 31 Invert Data through the mode...

Страница 176: ...ocking IMPORTANT By selecting Ý Ì ó º Ý Ô it is possible to configure the modem to raise an alarm if either the Sig Valid In line C switches to the inactive state As there is no X 21 equivalent of the RS422 Device DTE Ready In line TR set this to It is also possible to configure the Tx carrier to be switched on and off by the Sig Valid In line C by selecting Ý Ì Ó Ý ÎÌÍóÝ The interface will not wo...

Страница 177: ... Rx Clock menu should also be set to return Rx data in time with the single Tx Clock by also selecting Ì Ý µ NO OTHER COMBINATIONS WILL WORK The maximum data rate is 10Mbps over good quality twisted pair screened cable but this rate is reduced as the connecting cables extend beyond 10m As an estimate assume the maximum rate halves as the distance doubles ie 5Mbps to 20m 2 5Mbps to 40m etc By selec...

Страница 178: ...3 New terminated voltage generator for 10Mbps Strictly the P300 Series is compliant with the Type 2 interface defined for use from 100kbps to 10Mbps however in the P300 Series this interface will also operate down to 4800bps The low offset voltage Type 1 generator is not supported but as specified for use with older equipment in 1985 should not be an issue today The Type 3 is for data rates beyond...

Страница 179: ...0 allowing software selection of the interface RS422 V 35 RS232 G 703 control lines in non G 703 modes RTS etc in and line code and length in G 703 modes With the appropriate pins grounded the modem recognises it as a Eurocom D or G card and the software selections relating to the other interfaces are not available NOTE ESPECIALLY That when switching between Normal Eurocom D and Eurocom G modes ie...

Страница 180: ...Tx Clock Out ST 114 21 8 LK 7 DATA CIRCUIT FROM MODEM RX Clock Out RT 115 4 17 LK 4 Data Out RD 104 3 16 LK 5 COMMON LINES Ground to Activate Eurocom D 14 n a Do Not Connect 12 20 n a Signal Ground SG 102 2 7 13 15 22 25 n a Shield Protective ground PG 101 1 n a Links All links settings are Centre tap grounded 1 2 link up with the PCB legend the right way up Centre tap floating 2 3 link down with ...

Страница 181: ...t function correctly at this rate Min Signal Description 25 pin Link to ground centre tap of transformer A B DATA CIRCUIT TOWARDS MODEM TX Clock Data In 24 11 LK 3 DATA CIRCUIT FROM MODEM RX Clock Data Out 23 10 LK 6 COMMON LINES Ground to Activate Eurocom G at 16kbps 20 n a Ground to Activate Eurocom G at 32kbps 14 AND 20 n a Do Not Connect 12 n a Signal Ground 2 7 13 15 22 25 n a Shield Protecti...

Страница 182: ...onnector type 9 Pin D Female pin compatible with SA bus Pin Direction Name RS485 Name RS232 SA Bus Paradise 1 Shield Gnd Shield Shield Gnd Shield Gnd 2 SRR 3 Master B to modem SSD RX B 4 Slave B from modem SRD TX B 5 Shield Gnd SG Shield Gnd Shield Gnd 6 Slave A from modem RC TX A Tx data 7 SRS 8 SCS 9 Master A to modem SC RX A Rx data Pins 1 5 are both grounded on the modem ie Shield and Ground a...

Страница 183: ...M C link and devices bringing M C into a site from the satellite are considered the Remote end of the link For example at a Hub co located with the system M C computer every device would be considered the Local end of any M C links via satellite However at a node the device providing the incoming M C link from the satellite would be considered the Remote end of the link but any additional devices ...

Страница 184: ...ler Between Slave A and Slave B try 470 first farthest away from the controller then add 470 at the controller end too If necessary reduce both to 240 or even 120 3 Conn Ref is used for specifying cables For example a cable to connect a P300 at the distant end of a link with a Codan C5700 transceiver could be specified as A 500cm L ie connector A 5 metres of cable then connector L The 10 connector...

Страница 185: ...follows Unit 1 Unit 2 Pin 1 Screen Pin 1 circuit ground Pin 3 Pin 2 On Line signal 1 2 Refer to the earlier section on 1 FOR 1 switching for details of 1 FOR 1 operation Pin 2 Pin 3 On Line signal 2 1 Pin 6 Pin 7 Fail signal 2 1 Pin 7 Pin 6 Fail signal 1 2 Keep this lead as short as practical and ensure it is screened to prevent spurious changeovers by noise induced in these high impedance signal ...

Страница 186: ...uency 14 Not connected 15 Ground To externally inhibit the Transmit carrier either apply a TTL CMOS low signal to pin 7 or short pin 7 to ground for example with an external relay closure All relay contacts rated 30V DC 2A or 125VAC 0 4A The functions are as defined below Prompt Unit A unit fault exists i e an equipment failure Prompt Traffic A Tx or Rx traffic fault exists Deferred alarm One of t...

Страница 187: ...stellation monitor Rx signal quality 14 Rx I channel eye 7 Rx Q channel eye 15 Rx symbol clock 13 Ground RS422 Differential Station Clock Input 4 Station Clock a 11 Station Clock b 13 Ground RX CONSTELLATION MONITOR PORT If the Monitor AGC option is fitted it is possible to view a receive constellation but not the more traditional eye pattern To display the receive constellation on an oscilloscope...

Страница 188: ...x channels both ESC and Aux channels ie high rate async ESC INTELSAT low rate ESC cannot be used simultaneously In IDR Mode this port is not used as when the IDR option is fitted separate ESC and Aux ports on the IDR card replace this shared ESC Aux port Refer to the definitions of the ESC Aux ports on the 50 way IDR ESC Aux Backward Alarm connector on the following few pages SERIAL PORT FOR LOG P...

Страница 189: ... ESC Data in A Tx ESC Data in 14 Tx ESC Data in B n c 32 Rx ESC Clock out A Rx ESC Clock out 33 Rx ESC Clock out B n c 15 Rx ESC Data out A Rx ESC Data out 16 Rx ESC Data out B n c 46 Tx ESC Octet out A Tx ESC Octet out 47 Tx ESC Octet out B n c 48 Rx ESC Octet out A Rx ESC Octet out 49 Rx ESC Octet out B n c 17 Ground Ground indicates lines are optional In Closed Net Plus ESC mode the variable ra...

Страница 190: ...used In IBS modes the Aux port can be set to both INTELSAT using TS32 bit 1 and Sync modes selectable to use any of TS16 TS32 bits 1 5 8 TS48 In both modes a clock is provided and the port can be used synchronously with the clock or asynchronously allowing the async data to be oversampled by the higher rate clock In this oversampled mode as specified by INTELSAT the Baud rate is limited to approxi...

Страница 191: ...ntly from the front panel of 7dBm to 16dBm Audio is encoded as 32kbps ADPCM or 16kbps ADPCM in some custom modes The Audio ports may be used in two applications In IBS modes if set to emulate a P1348 P1448 Audio Data mux card the ESC ports provide the equivalent of the two audio ports on the P1348 P1448 ie can transmit 64kbps 2 audio channels or 128kbps 2 audio channels plus 64 kbps data from main...

Страница 192: ...ail when connected to 0V The Rx summary fault is an open collector output 0V Fail open collector OK From the front panel the backward alarm inputs BA x can be set as follows E Ext A Auto Rx fail O OK Menu Opt BA 1 BA 2 BA 3 BA 4 Mode 1 EEEE Ext patch Ext patch Ext patch Ext patch Mode 2 AEEE Rx Fail Ext patch Ext patch Ext patch Mode 3 AOOO Rx Fail Good Good Good Mode 4 AAAA Rx Fail Rx Fail Rx Fai...

Страница 193: ...ade optional However as most of the processing is provided by the T1000 ASIC the optional hardware is limited to The Sequential FEC a plug in Xilinx chip or module The Turbo codec a plug in module The Viterbi TCM FEC a plug in chip normally fitted but can be removed for Sequential only operation The G 703 option card T1 or E1 variants The IDR ESC interface audio transformers PCM codecs full ESC Au...

Страница 194: ...needs both the hardware to be fitted and the software to have that feature enabled Hardware The equipment determines what boards and assemblies are fitted when it powers up and generates an internal list of its hardware capabilities This can be displayed see Features Hardware below Software Some features are permanently software enabled Standard features This list can be displayed see Features Sta...

Страница 195: ... unless a Feature Code issued by Paradise Datacom is entered If you have no means to get a feature code from Paradise Datacom eg lack of comms public holiday etc use one of the 5 day user activated Feature Test periods to provide cover until you can contact us FEATURES STANDARD The letters shown represent the features that are permanently enabled in the equipment Standard features even if not requ...

Страница 196: ...temporary code valid for probably 30 days to enable you to raise and place a purchase order on your supplier When you place a formal order on the supplier for the features a Feature Code will be provided to make the features permanent If you are unable to contact Paradise Datacom for some reason use one of the 5 day Feature Tests to give you all the features for 5 days while you contact us Each mo...

Страница 197: ...SC channel for Closed Net plus ESC operation High rate IBS SMS ESC with IBS SMS feature Async ESC access to IDR 8k sync ESC channel with IDR option IBS SMS E IBS SMS framing to IESS 309 with low rate INTELSAT ESC to IESS 403 Drop Insert C Normal T1 E1 linear order Drop Insert excludes Odd values of N such as N 7 9 etc see feature D IDR F IDR operation to IESS 308 Two audio ESC channels Sync 8kbps ...

Страница 198: ...es Q and R above Monitor AGC Demod Rx carrier signal level monitor 0 10V Analog output of carrier signal level Eb No or Rx offset frequency in addition to normal AGC output Constellation monitor port 1544kbps G 703 1544kbps G 703 interface in addition to RS422 V 35 RS232 interface software selectable 2048kbps G 703 2048kbps G 703 interface in addition to RS422 V 35 RS232 interface software selecta...

Страница 199: ...e as configured is due to expire soon This means that after expiry it will cease to function as configured and one or several of the features required for how it is currently configured will no longer be available This Temporary Features mode is usually used to allow customers to evaluate features eg Drop Insert Reed Solomon for a finite duration after which the modem reverts back to its standard ...

Страница 200: ...ilised bits 0 to 5 Bit 6 is fixed at a one for both protocols and for the Paradise FDC protocol where the character has 8 bits 0 7 bit 7 is fixed at a zero Note that this applies only to Body characters there are no such constraints on the other characters in the message Electrical Interface Both protocols require a 4 wire plus ground interconnection between equipments Signals are at RS485 levels ...

Страница 201: ...ncluding STX and ETX characters 06H for zero Body length Address Slave address range 1 255 Zero is reserved for the Global address to which all devices respond Instruction Range 0 3FH Add 40H 6410 to request a standard ACK add 80H 12810 to request an extended ACK to this message Body From 0 to 248 characters resulting in a maximum message length of 255 characters Asterisk An ASCII character if the...

Страница 202: ...lave Body NAK One character an echo of the instruction sent ACK Where no response is expected ie a write message one character an echo of the instruction sent Where a response is called for ie a query message resulting in a read response the body is as defined for that response ETX As Master to Slave Checksum As Master to Slave Message Categories The remote M C messages break down into the followi...

Страница 203: ...ing ESC functions Scramblers current config or config memories 1 TxBBRd V0 61 from unit 58 TxBBQry Config 1 TxBBWr V0 61 to unit 19 58 ack Change 1 TxModQry V0 61 to unit 22 1 TxModRd Query Configuration of the Tx modulator functions ie modulation IF frequency Reed Solomon parameters FEC coding FEC rate Spectrum inversion current config or config memories 1 TxModRd V0 61 from unit 14 RdModQry Conf...

Страница 204: ...ble 3 UnitTestRd V0 61 from unit 3 UnitTestQry Status 3 UnitTestWr V0 61 to unit 41 3 ack Change 4 RxCalcQry V1 49 to unit 28 0 RxCalcRd Query Calculated Rx parameters eg intermediate data rates ie with each overhead as added Min overhead frame lengths ESC rates available current config only 4 RxCalcRd V1 49 from unit 26 RxCalcQry Config 4 TxCalcQry V1 49 to unit 29 0 TxCalcRd Query Calculated Tx ...

Страница 205: ... V0 71 from unit 178 Log16EventQry Log events 10 Log4EventQry V0 71 to unit 35 1 Log4EventRd Query log 10 Log4EventRd V0 71 from unit 46 Log4EventQry Log events 10 LogDoneMsgWr V0 71 to unit 36 2 ack End log query 11 RemoteKbdWr TBD to unit 9 6 RemoteLCDRd Keyboard Remote operation of unit as if from keyboard Initial RemoteKbdWr message with either all no key presses or single Main keypress initia...

Страница 206: ...ed message available P440 build P440Vxxx No Build applicable only to Q460 board ID_Dig 0 with Xilinx IFU ID_IFU 0 and 4M code storage Boot_Code will be V1 x for 4M P460 build P460Vxxx No Build applicable only to Q460 board ID_Dig 0 with ASIC IFU ID_IFU 1 or 2 and 4M code storage Boot_Code will be V1 x for 4M P480 build P480Vxxx Yes Build applicable to all Q480 boards ID_Dig 1 all of which have 8M ...

Страница 207: ...d to indicate which one of a 1 1 pair is on line and which off line When active the Deferred Alarm output becomes instead a Tx carrier On Off indication mimicking the operation of the Standby LED on the front panel Carrier On corresponds to the no alarm condition and Carrier Off corresponds to the alarm condition When used to indicate which one of a 1 1 pair is on line should both Tx carriers mute...

Страница 208: ...tes of 128kbps and below this is reduced to 2048 bits 64kbps and below 1024 bits and 32kbps and below 512bits This means the maximum delay is 32ms at 128 001kbps and stays between 32ms and 16ms right down to 16kbps below which with the minimum 512bits of processing memory the delay increases again above 32ms The data rate used to determine the processing memory size is the receive rate including a...

Страница 209: ...U indicated block ie when the antenna movement limits set on the ACU indicated the antenna was starting to point at the ship itself or more importantly the crew The solution is to link the block signal from the antenna directly to the modems external Tx Inhibit signal on pin 7 of the alarms connector grounded when blocked also connect a ground on pin 15 AND to set Fault Mode to 10 With the connect...

Страница 210: ...es P300 Rx spectrum invert and both Tx Rx spectrum invert in QPSK 12 OQPSK Compatibility Mode Software V2 12 When using Offset QPSK OQPSK modulation the in phase and quadrature components of each symbol do not change together as with QPSK but instead one component is delayed by half a symbol compared to the other In order to be in accordance with general industry practises Paradise Datacom has cha...

Страница 211: ... of 0V 0dB and 10V 20dB and a 0 1dB resolution This signal is forced to 0V when the demod is unlocked Note that although the scaling extends from 0 to 20dB the actual output range is limited to the range measurable by the software which is approx from a lower limit of 3 0dB demod unlock threshold to an upper limit of 13 19dB dependent on Modulation scheme FEC Rate Data Rate To Determine the upper ...

Страница 212: ...e CAS Multiframe sequence in TS16 48 Timeslot ID Maintenance which is the facility to maintain the identity of individual data streams when multiplexed together into one aggregate rate carrier eg two independent 64kbps circuits in one 128kbps carrier Additional Features Paradise products In addition to the basic INTELSAT definition above the P300 Modems provide the following additional features in...

Страница 213: ... Note this is not every frame as it requires a reasonable length of the scrambling pattern to be used to ensure the final data appears random The scrambling pattern itself is 2 15 1 32767 bits long and runs throughout the frame Scrambling is however disabled for TS0 TS32 otherwise the distant end could never find the frame sync then TS32 multiframe sync in order to find out where the scrambler sta...

Страница 214: ...undary maintenance is provided by placing the data into the IBS frame timeslot aligned after TS0 When TS0 is located the next 8 bits represent 8 bits from one terrestrial timeslot the following 8 from the next etc 1 Frame ie 60 available data timeslots N 1 2 3 4 5 6 10 12 15 20 30 Implementation of Timeslot ID Maintenance 1 Timeslot boundary maintenance start end of each timeslots 8 bits within th...

Страница 215: ...d 16 31 and these are carried sequentially in pairs in TS16 there is no signalling channel for TS0 nor TS16 as TS0 is reserved for the Frame Alignment Word and TS16 carries the signalling for the other timeslots Robbed Bit Signalling RBS Robbed bit signalling is a technique used on T1 PCM bearers whereby signalling is conveyed by stealing the signalling bandwidth from the 64kbps timeslot to which ...

Страница 216: ... for high rate ESC even when the CAS multiframe is required to support Odd values of N or Robbed Bit Signalling Historically PCM bearers using Robbed Bit Signalling could not be used with Drop Insert as over standard IBS links the location of the signalling information ie which timeslots have a bit overwritten with signalling was lost Even with Timeslot ID Maintenance which preserved timeslot sequ...

Страница 217: ...CAS 16 9 CAS 24 CAS 24 CAS 72 CAS 72 10 TS 32 CAS 8 TS 32 TS 32 11 CAS 88 CAS 88 CAS 88 CAS 88 12 TS 32 CAS 16 CAS 24 CAS 24 13 CAS 104 CAS 104 CAS 104 CAS 104 14 CAS 56 CAS 56 CAS 56 CAS 56 15 TS 32 CAS 8 CAS 24 CAS 24 16 TS 32 CAS 64 CAS 16 CAS 32 17 CAS 136 CAS 136 CAS 136 CAS 136 18 CAS 24 CAS 24 CAS 72 CAS 72 19 CAS 152 CAS 152 CAS 152 CAS 152 20 TS 32 CAS 16 TS 32 CAS 8 21 CAS 56 CAS 56 CAS ...

Страница 218: ...k Page 218 CAS 248 31 CAS 248 32 CAS 8 CAS 128 These are the Odd values of N for which the Timeslot ID cannot be maintained by the TS 32 Multiframe N 32 is a special case normally handled as unframed 2048kbps ie no Drop Insert or 1920 1984kbps D I with N 30 31 ...

Страница 219: ...t there is trouble with the link in the other direction Additional Features Paradise products Where many IDR carriers exist between sites the Audio ESC on the second and subsequent carriers are not required as the mandatory station to station ESC is met with the first carrier The P300 equipped with the IDR option standard on P300 IDR and above allows 32 or 64kbps access to the bandwidth occupied b...

Страница 220: ...e displayed message For Warning Check UNIT WARNINGS section Finally many messages also show READ or Note and display further information if the down arrow is pressed this is usually worth reading For Unit Fault Check UNIT FAULTS section For Tx Fault Check TX TRAFFIC FAULTS section For Tx Warn Check TX TRAFFIC WARNINGS section For Rx Fault Check RX TRAFFIC FAULTS section For Rx Warn Check RX TRAFFI...

Страница 221: ...ilure The unit has muted the Tx IF output to prevent transmitting an incorrect signal See note 8 Unit Fault Rx IF synth failure The synthesiser which generates the LO to receive the Rx carrier has failed An external 10MHz station reference may be used as the synthesizer reference so if the station reference is in use check it is present and has clean enough phase noise for its intended use Unit Fa...

Страница 222: ...R WILL MUTE outside operating range 0 60C This message refers to the internal unit temperature Check the modem vent slots are clear and the rear fan has not failed This Tx Mute may be disabled see Fault Mode 8 in Appendix E Warning 10MHz Reference clk in failed IF Clocks switched to int 1PPM ref The station clock set to 10MHz has been selected as the reference the Tx Rx synthesisers but it has fai...

Страница 223: ...abled Check the bearer type is specified correctly Change Tx Baseband Drop This normally only occurs if either there are significant errors on the terrestrial link or if it is supplied with AIS and the modem is set to ignore AIS Check that the AIS detector is not disabled with Change User Opt Operation Actions AIS ALSO there is an option to make the modem re seek frame sync if CRC sync is lost Cha...

Страница 224: ... slip The FIFO which interfaces the Drop Mux to the Framer has slipped full or empty This should never occur in operation contact factory Tx Warn Backward alarm at Tx input A Frame Backward Alarm is detected at the Tx Input This indicates that equipment downstream of the RECEIVE path has failed and is returning an alarm This may be due to any receive downstream equipment but could be due to the mo...

Страница 225: ... flange by adjusting both the Tx Carrier Level and where available the BUC attenuator Currently both of these adjustments are at an end stop and the modem cannot adjust the levels any further in order to try and maintain the set flange power RX TRAFFIC FAULTS Bottom line of disp l Rx Traffic Faults Rx OK LED Off and Rx Traffic prompt relay Rx Fault Demod unlocked at nn nnnn MHz The Demod cannot fi...

Страница 226: ...IBS specification IESS 309 specifies that the 48 56kbps data is bit stuffed up to 64kbps according to X 50 prior to IBS framing The bit stuffing adds an 80 bit repeating pattern which is detected at the Rx end then removed to return the data to 48 56kbps This message indicates the modem cannot find the 80 bit pattern in order to remove it Check the data is intended to be 48 56kbps X 50 stuffed to ...

Страница 227: ... PLL lock fail to source The PLL which generates the Rx output clock or backup Rx clock has failed to lock to the specified reference Check the reference specified as source is the correct frequency If a station clock is specified as available the modem will use this to generate the backup Rx output clock even if Station not specified as the primary source on the Rx Clock Mode screens Check that t...

Страница 228: ... as available the modem will use this as the source to generate the backup Rx output clock even if Station not specified as the primary source on the Rx Clock Mode screens Check that the Station clock is still connected as it is a common mistake to change the Rx Clock Mode to something other than Station then disconnect the station clock assuming the modem will not use it whereas the modem will al...

Страница 229: ...a deferred alarm Change User Opt Thresholds User BER See note 3 Rx Warn Buffer overflow recentre The Doppler Plesiochronous buffer has filled and automatically slipped to position itself back in mid position Half the buffer capacity will have been discarded but for framed data eg T1 E1 only frame sync will not be lost if the user option Change User Opt Operation Terr Sat Buffer MF Slip is set to A...

Страница 230: ...satellite TS16 frame 0 of CAS multiframe 0000 1111 Equivalent to SMS IBS IDR none none none Actions Other BM BUC Mutes not a modem function CM Carrier Mute Tx carrier is switched off TF Tx Flow control the CTS Clear To Send line is switched off RF Rx Flow control the RR Receiver Ready line is switched off Notes 1 In response to a CAS multiframe sync loss from the terrestrial port the appropriate a...

Страница 231: ...ating then check that the bearer is not set to Loopthrough AND at the same time looped back to the modem Tx input even if via other equipment 7 If the user control Thin Route Spoof Change User opt Operation Terr Sat Thin Route Spoof is set to On to spoof full bearer connectivity when passed over a Thin Route satellite circuit ie not the whole bearer data rate then a CAS backward alarm incoming on ...

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