Symbol Rate Ratio, CnC Carrier Offset | Mocomtech CDM-QX manual

CDM-Qx Satellite Modem	Revision 5
CnCPerformance Characterization	MN/CDMQx.IOM

		Eb/No Degradation (vs) CnC Ratio (16-QAM)
	0.0
	-0.2
(dB)	-0.4
(dB)	-0.6
Degradation	-0.6
	-0.8
	-1.0
	-1.2
Eb/No	-1.4	16-QAM 3/4 Turbo
Eb/No	-1.6	16-QAM 7/8 Turbo
	-1.6	16-QAM 7/8 Turbo
	-1.8
	-2.0
	-10	-5	0	5	10
		CnC Ratio (dB)

Figure D-8. CnC Ratio For 16-QAM

D.5	Symbol Rate Ratio

CnC operation is restricted to a maximum symbol rate ratio ≤3. This is the ratio of the larger carrier to the smaller one. Within these limits, the performance characterized applies. The limitation on the symbol range still allows a wide range of data rates.

It is necessary to take into account the symbol rate ratio to properly estimate the CnC ratio, although the modem does this automatically. For estimating the link parameters, the CnC ratio is adjusted by 10 Log (Symbol Rate Ratio). If the symbol rate ratio is 2.0 then the narrower carrier has a 3 dB CnC ratio when the CnC carriers have the same spectral density.

D.6	CnC Carrier Offset

CnC carriers are normally placed directly on top of each other with the same center frequency for both carriers. Normal operation is obtained when the center frequency of the two carriers is within ± 32 kHz. This is the same as the normal acquisition range of the modem for standard and CnC carriers.

D.7	1st CnC Example: Adjacent Carriers, CnC Ratio and Rain Fade

As an example, a pair CnC carriers is flanked by two adjacent CnC pairs with a carrier spacing of 1.3 x Symbol Rate and the power level is the same for all carriers as shown in Figure D-9. In this scenario, the modulation is 8-PSK 3/4 Turbo with identical data rates.

D–8

Image 250

Mocomtech CDM-QX Symbol Rate Ratio, CnC Carrier Offset, 1st CnC Example Adjacent Carriers, CnC Ratio and Rain Fade

Contents

CDM-Qx RevisionPage Errata a Acquisition rangePage Errata B Page Errata C Rx Rs n/k ENT IESS-310 network 219/201Page Errata D Tx Rs n/k ENT IESS-310 network 219/201Page Part Number MN/CDMQx.IOM Revision January 20,2007 Customer Support Table of Contents Chapter Functional Description External Connections Evolution of TPC in Comtech Products Comparison of all TPC Modes 11-1 Management Information Base MIB Files About this Manual Electrical Safety International Symbols CE Mark Warranty Policy CDM-Qx Satellite Modem Revision Preface MN/CDMQx.IOM Xii Introduction CDM-Qx/QxL Features Software Flash Upgrading DoubleTalk Carrier-in-CarrierVerification Data Interfaces Remote ControlTurbo Product Coding Assembly Description Major Assemblies Fast Options and Hardware Options Fast Implementation Fast Accessible OptionsFast System Theory Hardware Options Supporting Hardware and Software Band Compatibility CDM-Qx Satellite Modem Revision Introduction MN/CDMQx.IOM Installation Unpacking Optional Rear-Mounting Installation Bracket Mounting Installation of the Optional Mounting Brackets Connect External Cables ConfigurationSelect Internal if Loop Observe the following Functional Description Page Modem Block Diagram Page Connections Front Panel LED Rear Panel Rear PanelPage BNC Modem Rear Panel ConnectorsName Ref. Desig Connector Type Function IEC RF Output 75 or 50Ω Remote Control Interface Connector Pin Assignments 2 M&C 10/100BaseT Connector3 485/232 Connector Use for 2-wire RS-485 operation Alarm Interface Connector Pin Assignments Alarms ConnectorPin # Signal Function Name Balanced G.703 Interface Connector Pin Assignments Balanced G.703 Connector Tx/Rx ConnectorUnbalanced G.703 Tx/Rx Connectors Pin # Signal Function Name Direction Lvds 7 RS-530 Data Interface ConnectorPin # Generic Signal Description Direction RS-422 RS RS-232 Circuit # Quad E1 Data Interface Connectors Xx6. Quad E1 Data Interface J1 Connector Pin Assignments DC Power Connector RX and TX if ConnectorsAC Power Connector AC Power Specifications Ground Connector This page is intentionally left blank Operation LED Front Panel LED IndicatorsColor Condition ENT Diamond Keypad Presently used on all UnitsCLR Right Hand Display Area Left-Hand Display AreaModems TXF Redundancy MD MD Right-Hand Display Area Accessing the Display AreaSpectrum Analyzer RXS Principle Menu Tree Comtech EF Data CDM-Qx Firmware Version Main Menu Config Monitor Test Info Save/Load Util ODUOpening Screen ODU Config Config Remote Tx Rx Group Frame Interface Ref Mask ODU Config„Remote„Serial Config„Remote Remote ControlConfig„Remote„Serial„Interface Config„Remote„Serial„Baudrate Config„Remote„Serial„Interface„RS485 RS-485 Bus AddressConfig„Remote„Ethernet Config„Remote„Ethernet„MAC Config„Remote„Ethernet„GatewayConfig„Remote„Ethernet„Address Config„Remote„Ethernet„SNMP Config„Remote„Ethernet„SNMP„Traps Config„Remote„Ethernet„SNMP„CommunitiesSnmp Trap IP Addr#1 ENT Trap Community , ENT comtechTrap Version ENT SNMPv1 SNMPv2 Trap IP Addr#2 ENT Config„Tx Transmit Tx FEC Mod Code Data Freq On/Off Pwr Scram Clk Inv Txα Tx FEC Vit Vit+RS TCM+RS Config„Tx„FEC TX FEC TypeConfig„Tx„Mod Modulation Scheme TPC Tx Code Rate 5/16 21/44 1/2 3/4 17/18 Config„Tx„Code TX Code RateConfig„Tx„Data TX Data Rate Tx Data Rate 05000.000kbps Sym02500.000ksps Config„Tx„Freq TX if Frequency Tx if Freq 1156.3456 MHz Tx Output State On Off RxTxInhibit Common , ENT Config„Tx„On/Off Transmit ON/OFF ControlTx if Freq 1156.3456 MHz RF=14156.3456 ENT Tx Common Output State Off On Config„Tx„Pwr„Manual Manual Mode Config„Tx„Pwr Transmit Power Level ModeConfig„Tx„Pwr„AUPC Aupc Mode Config„Tx„Pwr„AUPC Alarm Config„Tx„Pwr„AUPC Target Eb/NoConfig„Tx„Pwr„AUPC MAX Range Config„Tx„Pwr„AUPC DEMOD-UNLOCK Config„Tx„Scram Scrambler Config„Tx„Pwr„Combined Combined Transmit PowerConfig„Tx„Clk TX Clocking Mode Tx Spectral Inversion Normal Inverted Config„Tx„Inv TX Inversion FunctionsTx Inversion functions Spectrum Data Clock ,ENT Tx Data Sense Tx Roll-off 20% 35% ENT Config„Tx„Txα TX Roll-Off α factorConfig„Rx Receive RxFEC Demod Code Data Freq Acq Descram Buf Inv Misc CnC TCM+RS Config„Rx„FEC RX FEC TypeRx FEC Vit Vit+RS Case Rules Comment Demodulation Bpsk Qpsk 8-PSK 16-QAM Config„Rx„Demod Demodulation SchemeConfig„Rx„Code RX Code Rate Rx Code Rate 5/16 21/44 1/2 3/4 7/8 17/18 Config„Rx„Data RX Data Rate Rx Data Rate 05000.000kbps Sym02500.000ksps Rx if Freq1156.3456 MHz RF=12156.3456 ENT Config„Rx„Freq RX FrequencyConfig„Rx„Acq Demod Acquisition Range Demod Acquisition Range Config„Rx„Buf RX Buffer Clock Source Config„Rx„Descram DescramblerENT Config„Rx„Inv RX Inversion Functions Config„Rx„Misc Rx Miscellaneous Config„Rx„Misc„Rxα RX Roll-Off α factor Config„Rx„Misc„EbNo Eb/No AlarmConfig„Rx„CnC CARRIER-IN-CARRIER→ Please Check TX Power Level Config„Rx„CnC„Mode CnC→ Mode of OperationConfig„Rx„CnC„FrqOffs CnC Frequency Offset Please Wait Config„Group Grouping MOD/DEMOD Cards Config„Rx„CnC„SrchDelay CnC Search DelayConfig„Rx„CnC„ReAcq CnC RE-ACQUISITION Time Config„Group„Modem Config„Group„Redundancy„Config „11 Config„Group„RedundancyConfig„Group„Redundancy„Config Config„Group„Redundancy„Config „12 Config„Frame Framing Mode Config„Group„Redundancy„ModeConfig„Group„Redundancy„Mode„Manual Config„Frame„Unframed Unframed AUPC+EDMAC Edmac ModeFraming mix AUPC-Only Master Slave 0240 Config„Frame„D&I++ D&I++Distant-end Base Address Address This Slave Unit ENT Hssi ASI G.703 QDI None Config„Interface Data InterfaceInterface RS422 V.35 RS232 RTS/CTS operation , ENT Loop,RTS Controls Tx Out HDB3 AMI T1 Line Length Feet 703 E1 Line Code HDB3 AMI , ENT HDB3 AMI Alarm Mask Transmit Receive Reference BUC LNB ,ENT Config„Ref Reference OscillatorConfig„Mask Mask Frequency Reference Internal MHz ENT Rx Alarm Mask AGC Eb/No Rx-AIS Buffer Tx Alarm Mask Tx-FIFO BPV Tx-AIS ENTTx-FIFO Alarm ENT Active Masked AGC Alarm BUC Alarm Reference AlarmLNB Alarm ODU Config„ODU Outdoor Unit for L-Band Unit OnlyConfig„ODU„BUC Block Upconverter BUC BUC LNB Config„ODU„BUC„M&C-FSK„Address FSK Address Config„ODU„BUC„M&C-FSK M&C FSKConfig„ODU„BUC„M&C-FSK„Address FSK Comms BUC M&C Config„ODU„BUC„10MHz BUC 10MHz Config„ODU„BUC„M&C-FSK„Tx-On/Off FSK TX-ON/OFFConfig„ODU„BUC„DC-Pwr BUC DC Power Config„ODU„BUC„Alarm BUC Alarm BUC Current Alarm Lower Limit1200mA Config„ODU„BUC„Delay BUC DelayBUC Current Alarm Upper Limit1200mA Power-On Delay Config„ODU„BUC„LO BUC LO Config„ODU„BUC„Mix BUC MIX Config„ODU„LNB„Voltage LNB Voltage Config„ODU„LNB LNBLNB DC Config„ODU„LNB„10MHz LNB 10MHz Config„ODU„LNB„Power-On/Off LNB POWER- ON/OFFConfig„ODU„LNB„Alarm LNB Alarm LNB Current Alarm Lower Limit 050mA ENT Config„ODU„LNB„LO LOConfig„ODU„LNB„Mix MIX LNB Frequency Mix Monitor„Alarms Alarms Monitor„Alarms„Unit Unit Alarms Monitor„Alarms„Transmit Transmit Alarms Monitor„Alarms„Receive Receive AlarmsMonitor„Alarms„ODU Outdoor Unit Alarms Monitor„Rx-Params RECEIVE-PARAMETERS Monitor„Event-Log EVENT-LOG or Stored Events Monitor„Event-Log„View View Stored Events Log 023 30/11/02 Fault Demod Lock 3 ,ENTLog 024 30/11/97 Clear Demod Lock 3 ,ENT Monitor„Stats Link Statistics for grouped as modem only Link Statistics View Clear-All Config ENTMonitor„Stats„View View Link Statistics Monitor„Stats„Clear-All Clear ALL Stats Monitor„Stats„Config Configure StatsStats Logging Interval Disabled,ENT Clear all Stored Stats? No Yes Monitor„AUPC Monitor AUPCfor grouped as modem only Monitor„CnC Monitor CARRIER-IN-CARRIER CnC Monitor„ODU Monitor ODU for L-Band Unit only ODU LNB Mode Norm if 2 Dig 2 I/O 2 RF Tx-CW Tx1-0 ENT Test Mode Bist ENT Spec-AnalyzerTest TX-CW Norm If Loop Dig Loop RF LoopTX-1,0 Bert Monitor Errs=0000253 BER=8.5E-07 Bist BERT-Config BERT-Mon BERT-Control ENTBert Config Tx=ON Rx=ON Tx-Pat=2047 Rx-Pat=2047 Bert Control 10E-3Err=OFF Restart=NO SyncThres=256 Config Spectrum Analyzer CenterFreq Span Mode ConfigSpectrum Analyzer Mode Spectrum Analyzer If Loopback Info Information Info„Rem Remote Control InformationInfo Rem Tx Rx Buffer Frame Interface Mask Ref ID Tx 1140.000 05000.000 TUR 8P 17/18 S EXT -20.0 on N Info„Tx TX InformationTx C N N Rx C N N Info„Rx RX InformationRx 1140.000 05000.000 TUR 8P 17/18 D RX BUF +/-32k N Demod Sweep Acquisition range Info„Frame Framing and Edmac Information Buffer Enabled Tx=Rx ENTInfo„Buffer Buffer Information Info„Interface Interface Information Info„ID Circuit Identification Info„Mask Alarm Mask InformationInfo„Ref Frequency Reference Character TST Message Save/Load„Save Save Configuration No YES Empty ENT Save/Load„Load Load ConfigurationNew Config has been Loaded From Location Contains No Data! ENT Utility RxBuffer Clock Ref ID Display Firmware Fast Utility„RxBuffer Buffer RecenterUtility„Clock REAL-TIME Clock Real-Time Clock , ,ENT Time=120000 Date24/04/03 Utility„ID Circuit Identification Utility„Ref Reference AdjustWarm-up delay ENT Internal Freq Utility„Display Display Brightness Utility„Firmware Firmware Update Cpld to v1.x.x? No Yes ENT Current Active Image #1 Next Reboot Image #1 #2Programming Cpld Utility„FAST Fast Code Options Fast View Options ENT Redun Not Installed Edit 20 digit Fast Code 00000000000000000000 ENT Forward Error Correction Options Viterbi Decoding Summary ViterbiFor Against Reed-Solomon Outer Codec Closed Network Modes Concatenated R-S Coding Summary Trellis Coding PSK/TCM Coding Summary Turbo Product Codec Hardware Option Introduction Evolution of TPC in Comtech Products Turbo Product Coding processing delay comparison End-to-End Processing DelayAvailable TPC Modes Comparison of all TPC Modes Turbo Product Coding Summary Viterbi Decoding BER Viterbi with Without 219, 201 RS PSK/TCM Rate 2/3Decoding, with Outer Code CDM-Qx Satellite Modem Forward Error Correction Options Comtech Turbo Product Codec Rate 3/4 QPSK, 8-PSK 16-QAM Comtech Turbo Product Codec Rate 7/8 QPSK, 8-PSK 16-QAM Comtech Turbo Product Codec Rate 21/44 Bpsk and Rate 5/16 Bpsk Turbo BPSK/QPSK BER Page Edmac Channel Theory Of Operation M&C Connection Setup Summary This page is intentionally left blank Automatic Uplink Power Control Target Eb/No Setting Aupc ParametersMax Range Demod Unlock AlarmCompensation Rate Monitoring DoubleTalk Carrier-in-Carrier Page Transponder Utilization with and without CnC→ Page Redundancy CDM-Qx Satellite Modem Revision Redundancy MN/CDMQx.IOM 10-2 Management Ethernet Management Interface Protocols Web Server Http Interface Web Web Server Menu Tree Web Server Menu TreeLevel 11-4 11-5 11-6 11-7 Snmp Interface Management Information Base MIB Files Snmp Community Strings Snmp Traps Alarms and Faults SNMPv2 notifications Telnet Interface 11-11 11-12 Page Page Modulator FEC Comtech EF Data Power Spectral DensityReferred to symbol rate CDM-Qx Transmit PSK/TCM Codec DemodulatorViterbi Turbo Product Modulation HIGHER-ORDERCoding Automatic Uplink Power Control Future Hssi Data Rate Ranges Miscellaneous Framing Summary FutureFCC Page Ethernet FTP upload procedure Appendix B. Flash Upgrading Construction Sector CDM-Qx Satellite Modem Revision Flash Upgrading MN/CDMQx.IOM Appendix C. Remote Control RS-485 RS-232 Basic Protocol Controller-to-target Packet StructureStart Of Packet Example 0135/TRQ=70.2345CR Target-to-controller Instruction Code AddressSlot Address Instruction Code Qualifier ‘=’ code Target to Controller is used in two ways $ code target-to-controller is only used as follows Message Arguments Remote CommandsEnd Of Packet CDM-Qx Satellite Modem Revision Remote Control MN/CDMQx.IOM TX Remote Commands TCR TCR=TCR? TCR# TSI TSI=TSI= TSI? TSI# TSI$ TCK TCK=TCK= TCK? TCK# RFQ RFQ=RFQ= RFQ? RFQ# RFQ$ =BPSK RMD RMD=RMD= RMD? =QPSK RMD# RDR RDR=RDR= RDR? RDR# RSW RSW=RSW= RSW? RSW# EBA EBA=EBA= EBA? EBA# EBA$ ITF ITF=ITF= ITF? ITF# ESA ESA=ESA= ESA? ERF= TST TST=TST= TST? TST# AUP AUP=AUP= AUP? AUP# LBO LBO=LBO= LBO? LBO# HHC? HssiHHC= HHC Applies to CST CST=CST? CST# TIM TIM=TIM= TIM? TIM# IRM IRM=IRM = IRM? IRM# FBU FBU=FBU= FBU? FBU# CSD CSD=CSD? CSD# Query Commands EID? Bytes UID? =Change in fault FLT? WHO? REB? CC is Fault Code numbers, as in FLT? Or Infor Code, which RNE= RNS=CR CRM? RSL?RX BER CDM? SWR? CFM?FRW? IMG IMG=IMG= IMG? IMG# ITP? Bulk Commands OGC OGC=OGC= OGC? OGC# BAD= Arguments For Command or Response to QueryBand Unit Only BCL= BOE=BCH= BUC LO BLO= BPA? BUCBUT? BSV? Parameter Instruction Type Code Qualifier LNB Power Control Band Unit Only Parameter Instruction Type Code Qualifier Parameter Command Instruction Type Code Qualifier BCT# BCT=BCT= BCT? BCT$ SPS= SPM=SPF= SPM= SPM? DNI= DNI= DNI? DNI# DNI$ DNI DTS= Parameter Instruction Type Code Qualifier Drop TimeslotApplies to Cards grouped As modem CDM-Qx Satellite Modem Revision Remote Control MN/CDMQx.IOM Performance Characterization Carrier-in-CarrierDescription Degradation Due To Carrier Spacing Figure D-1. Adjacent Carrier a As Tested and BAs Plotted Degradation ≤ 0.5 dB Carrier Spacing For20% Rolloff Carrier Spacing For 35% Rolloff PSK 3/4 Turbo, α = 35% Selecting The Adjacent Carrier Curve Figure D-5. Adjacent Carrier Cases Case Desired Adjacent Carrier Curve To Use In Figure D-2, ErrorCarrier-in-Carrier Ratio CnC Ratio Found., or D-4 Figure D-7. CnC Ratio For Qpsk and 8-PSK CnC Carrier Offset Symbol Rate Ratio1st CnC Example Adjacent Carriers, CnC Ratio and Rain Fade Comment DL Fade UL Fade Site a Site BSite a Site B Per Figure D Figure D-10. Link With Fading At Site a 2nd CnC Example CnC Ratio With Asymmetric Links Link parameters and results are summarized in the table Parameters Site a Site B Eb/No Degradation At Site a Parameter Due To Fade At 3rd CnC Example Asymmetric Link With Rain FadePer Figure D- Qpsk Conclusion Eb/No Degradation At Site B Parameter Due To Fade At Metric Conversions 480 333 2200 Phone 480 333 2161 FAX