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1000000 Achievable Data Rate (bps) 100000 10000 1000 100 MAR: DG1 Mode 1 Rate 1/2 Convol. Encoding LEOFOV for F3-F7 FOR EXAMPLE ONLY BER 1E-5 Customer Platform EIRP Margin 3.0 dB Space Loss -192.2 dB Polarization Loss -0.5 dB RFI Degradation -0.5 dB Noncompliance Degradation 0.0 dB Customer Platform Antenna Pointing Loss 0.0 dB 0 5 10 15 20 25 30 Customer Platform EIRP (dBWi) Figure A-43. MAR DG1 Mode 1 (Rate 1/2) ADR versus EIRP (LEOFOV for F3-F7) Revision 10 A-48 450-SNUG
Appendix B. Functional Configurations for TDRSS Forward and Return Services (with Emphasis on Resolving Customers’ Data Polarity and I-Q Channel Ambiguities) B.1 General B.1.1 Purpose The purpose of this Appendix is to describe the transmitter data communication functional configurations for TDRSS forward services and return services. Additionally, for each configuration, this Appendix identifies the conditions under which either data polarity ambiguity or I-Q channel ambiguity may exist at the SN/customer data interface. B.1.2 Data Polarity Ambiguity and I-Q Channel Ambiguity When data polarity ambiguity exists at the SN/customer data interface, the logical sense of the data may be either true or inverted. When I-Q channel ambiguity exists at the SN/customer data interface for the dual-source configurations, received I-channel or Qchannel data may appear on the designated interface port for the I-channel data, and received Q-channel or I-channel data may appear on the designated interface port for the Q-channel data. Data polarity ambiguity and I-Q channel ambiguity are addressed in paragraph B.2 for forward service and paragraph B.3 for return service. B.1.3 Definitions In this Appendix, “data format” refers to the format of the source data either prior to transmission (uncoded operation) or prior to convolutional encoding (coded operation). “Symbol format” refers to the format of the channel data that is modulated onto the carrier. Figure B-1 depicts the definition of the various NRZ and Biphase formats. B.2 Forward Service B.2.1 General The customer/SN end-to-end system functional configuration for forward service is shown in Figure B-2. Forward service data generated in the customer MOC is transmitted to the SN data interface. Refer to Section 3, paragraph 3.6, for information concerning data interface capabilities and restrictions. The NISN, WSC, GRGT and TDRS are transparent to the data format and coding scheme of the forward link data originating in the customer MOC, except for WDISC and SSA PM customers. The SN supports forward data conditioning operations for WDISC and SSA PM forward link customers. Revision 10 B-1 450-SNUG
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452 / Space Network Project 450-SNU
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Space Network Users’ Guide (SNUG)
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Preface The Space Network Users’
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Change Information Page List of Eff
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Table of Contents Section 1. Introd
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6.2.5 Real-Time Configuration Chang
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Appendix B. Functional Configuratio
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Appendix J. Customer Constraints fo
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Figure 10-5. NCCDS/NEST Scheduling
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Figure B-6. Customer Platform Funct
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NASA Standard Transponder .........
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Table B-3. Data Configuration Const
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1.1 Purpose and Scope Section 1. In
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Section/ Appendix Table 1-1. Docume
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S SN Future Services Describes futu
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Many of the links require access to
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Revision 10 1-9 450-SNUG https://co
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Section 2. SN Overview 2.1 General
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Revision 10 2-3 450-SNUG Customer P
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Multiple Access Antenna • 30 elem
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Table 2-1. Example of TDRS Constell
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services. The detailed TDRS spacecr
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Average Coverage (%) 100 95 90 85 8
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quality. For further information on
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3.1 General Section 3. Services Ava
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Revision 10 3-3 450-SNUG MA (note 1
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Table 3-2 provides an overview of t
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Revision 10 3-7 450-SNUG TDRS G/T (
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Data Group and Mode (note 4) Table
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platforms to have SA support on one
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a TDRS. Compatibility testing is pe
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NASA-unique 4800 bit block and then
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Revision 10 3-17 450-SNUG Table 3-4
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the Space Network's ability to supp
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4.1 Overview Section 4. Obtaining S
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5.1 General Section 5. MA Telecommu
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an appropriate forward service has
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Table 5-1. TDRSS MA Forward PSK Ser
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NOTE: Customers who operate in a SS
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Table 5-3. Salient Characteristics
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e. The customer platform receiving
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DG1 (note 1) Table 5-6. TDRSS MA Re
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Table 5-6. TDRSS MA Return Service
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platform transmit frequency for non
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configurations, the I-Q channel amb
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Acquisition (note 3) (cont’d): Ta
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d. After symbol/decoder and symbol/
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Section 3, paragraph 3.5 for guidel
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5.3.3.4 Reacquisition While in the
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5.3.5 Acquisition Scenarios The fol
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d. DG2 Mode Transitions. 1. DG2 non
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6.1 General Section 6. SSA Telecomm
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6.2.2 PSK Signal Parameters The TDR
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Table 6-1. TDRSS SSA Forward PSK Se
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6.2.2.2 BPSK Signal Parameters a. B
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unless the customer is utilizing th
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Table 6-2. TDRSS SSA Forward Phase
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Table 6-3. TDRSS SSA Forward Servic
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d. The customer platform receiving
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DG1 (note 1) Table 6-7. TDRSS SSA R
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Table 6-7. TDRSS SSA Return Service
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6.3.2.2 DG1 Signal Parameters DG1 s
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and signal characteristics specifie
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3. Balanced Power Single Data Sourc
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and an ephemeris uncertainty as def
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Table 6-11. SSA Return Service Real
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2. DG1 Mode 1 (or 3) to DG1 Mode 2
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Table 6-12. TDRSS SSA Return Servic
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service is supported through TDRS F
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Table 6-14. TDRS SSAR IF Service Sp
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7.1 General Section 7. KuSA Telecom
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c. Frequency Sweep on the Forward L
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Table 7-1. TDRSS KuSA Forward Servi
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7.2.5 Acquisition Scenarios The fol
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Table 7-4. KuSA Forward Service Rea
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Table 7-5. TDRSS KuSA Return Servic
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. SQPSK Modulation. SQPSK modulatio
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7.3.2.3 DG2 Signal Parameters DG2 s
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Revision 10 7-21 450-SNUG Dual Data
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code and carrier acquisition will b
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identical data) having unbalanced I
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acquisition, the process should tra
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Table 7-8. KuSA Return Service Real
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egins) or by its customer platform
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Reconfiguration and reacquisition b
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7.3.6 225 MHz IF Service This secti
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Table 7-11. TDRS KuSAR IF Service S
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7.3.6.3 Potential Signal Performanc
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8.1 General Section 8. KaSA Telecom
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8.2 KaSA Forward Services 8.2.1 Gen
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Table 8-1. TDRSS KaSA Forward Servi
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c. Asynchronous Data Modulation. Fo
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Table 8-2. TDRSS KaSA Forward Servi
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in Table 8-1. The EIRP directed tow
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Table 8-5. TDRSS KaSA Return 225 MH
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Single Data Source Dual Data Source
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Revision 10 8-21 450-SNUG Acquisiti
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8.3.3.2 Bit Error Rate (BER) Table
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d. Loss of Autotrack. Loss of autot
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Table 8-8. KaSA Return Service Real
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noncoherent transmissions are desir
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Table 8-9. TDRSS KaSA Return 225 MH
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Changes to the operating conditions
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Table 8-11. TDRS KaSAR 225 MHz and
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Section 9. Tracking and Clock Calib
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(sample-to-sample) range data as in
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NOTE: The definition of 240. MHz is
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time" refers to that portion (leadi
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e. TDRSS Delay Compensation. The WS
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Section 10. SN Operations for TDRSS
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Table 10-2. Overview of SN Message
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10.2.2.6 Schedule Distribution List
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Table 10-3. Schedule Request Descri
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Revision 10 10-9 450-SNUG Applicabl
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10.2.3.4 Forecast Scheduling Genera
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which have been committed to the SN
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10.2.4.2 Specific Schedule Request
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e. Each SSC represents a single ser
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NOTE: TUT reports are not transmitt
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Scheduling Data (SHO) Operations Me
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10.2.7.2 NISN Event Schedule (NES)
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System Element Table 10-7. Real-tim
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System Element Table 10-9. Real-tim
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System Element Table 10-10. Real-ti
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System Element Table 10-10. Real-ti
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Revision 10 10-33 450-SNUG Message
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Page 315 and 316: 10.4 Customer Platform Emergency Op
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Page 369 and 370: Customer MOC SN Data Interface WDIS
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Page 405 and 406: C.4 Reacquisition C.4.1 Introductio
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Page 413 and 414: Appendix D. Spectrum Considerations
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PFD (α) = maximum power flux densi
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Equation D-5: sin 4 ( x) P T , / 2
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For signals with two channels, the
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PFD (dBW/m^2/4kHz) -142 -144 -146 -
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Figure D-4. NTIA Out-of-Band (OOB)
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Table D-5. Spectrum Points of Filte
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criteria for deep space operations
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PSD (dBW/Hz) -170 -180 -190 -200 -2
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potential interference to other sys
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Annex to Appendix D D.A.1 Special C
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Table D.A-1. Peak Power Calculation
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Appendix E. Customer Platform and T
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1. Jitter = None (Coded or Uncoded
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Figure E-8. QPSK Phase Imbalance id
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R max R ideal Figure E-11. Residual
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For forward service: O/ OUT AM / PM
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E.16 Out-of-Band Emissions Out-of-b
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E.21 PN Chip Rate PN code chip rate
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Appendix F. Periodic Convolutional
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Revision 10 F-3 450-SNUG ENCODER SY
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Appendix G. Predicted Performance D
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G.3.3 If the RFI environment become
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G.6 SSA and MA Forward Service RFI
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Appendix H. Demand Access System (D
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H.1.4 DAS Service Modes There are t
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DAS provides service through each s
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modulation format. Acquisition by D
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H.1.5.3 Transmission Delays The ove
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Receiving service request responses
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Revision 10 H-13 450-SNUG Customer
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H.3.2 Communications Interface H.3.
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Upon determining that the request i
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Appendix I. NASA Integrated Service
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Figure I-1. NISN/SN Legacy Interfac
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I.2.2 Non-IP Routed Data Services P
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Network Control Header Customer Hea
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NOTE: A block with bit 82 set to bi
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Appendix J. Customer Constraints fo
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J.3 Acquisition For S-band DG2 nonc
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Appendix K. Use of Reed-Solomon Cod
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NOTE: Throughout this document, the
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Appendix L. McMurdo TDRSS Relay Sys
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Appendix M. Deleted This page inten
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N.3 Test Services Description Test
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TDRSS component may require the who
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N.6.2 Test Scheduling The use of al
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model also determined duty cycles f
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P.1 Major System Components P.1.1 C
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P.2 External Interfaces P.2.1 Netwo
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The user will be able to print eith
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SNAS MOC user will be able to speci
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The SNAS will allow a minimum durat
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the DAS Resource Allocation Request
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gateway and a proxy for the Closed
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Figure Q-1. WDISC Overview Q.2.1 IP
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database management, testing, troub
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In general, to obtain SN services,
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scheduling of SN Gateway services a
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Figure R-1. SN Gateway Overview Rev
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Figure R-3. WSC SN Gateway Interfac
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Table R-1. Comparison of Between WD
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Table S-1. TDRSS Forward Service Si
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Service Modulation Coding (2) Data
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Service Data Group DG2 (5) Phase Mo
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Service Data Group Mode Modulation
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Command Data Telemetry Data Ground
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And Data Handling (C&DH), referred
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Table U-1. TDRSS MAR Service Recomm
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Table U-2. TDRSS SSAR Service Recom
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BSR bit slippage rate BW bandwidth
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EET End-to-End Test EIF Engineering
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IRAC Interdepartmental Radio Adviso
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NASCOM NASA Communications Network
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R R range acceleration between a T
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SND Space Network Directive SNG SN
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T s receiving system noise temperat
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