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C.4.2 Customer MOC/NCCDS Initiated Reacquisition C.4.2.1 Table C-4 and Table C-5 summarize the parameters controlled by the customer MOC which may lead to service interruption for the forward and return services, respectively. The tables indicate the consequence of requesting each parameter in regard to both reacquisition and TDRSS reconfiguration. C.4.2.2 As indicated in Table C-4 and Table C-5, the customer MOC may request, via the NCCDS, a service reacquisition. Normally this request is initiated only after the customer MOC detects a problem and only if no TDRSS problems exist as indicated in the information conveyed from the WSC to the NCCDS via an ODM1 . In this case, the customer MOC may instead choose to simply terminate service or to change some operating condition or parameter as cited in paragraph C.4.1. C.4.2.3 As seen in the tables, the customer MOC has the option to select forward and return service reacquisitions independently. However, for coherent turnaround operations, a forward service reacquisition will lead to a return service interruption and the WSC will automatically initiate return reacquisition after forward reacquisition. For noncoherent operations, forward and return service reacquisitions are independent so that the corresponding customer MOC-initiated reacquisition requests may also be invoked independently. C.4.2.4 Figure C-1 and Figure C-2 provide an overview of some of the key elements that lead to the requirement for reacquisition of the forward and return service signals, respectively. Also included is some of the logic associated with the ground terminal regarding reacquisition. Normally, the customer MOC will detect a service fault whenever problems are detected by the ground terminal (please see paragraph C.4.3 below). In this case, the ground terminal may automatically take the appropriate action, thereby perhaps alleviating the need for the customer MOC to request reacquisition. C.4.2.5 The ground terminal monitors and reports on numerous elements of the ground terminal GCE and the TDRS, including performance data (such as loss of lock conditions) and equipment status (such as hardware faults). In addition, in some cases, the ground terminal automatically initiates reacquisition of the appropriate service. Consequently, with reference to the customer MOC, acquisition contingencies need be developed primarily for those situations in which the ground terminal does not initiate reacquisition. 1 Transmission of ODMs from the NCCDS to the customer MOC must be requested (in advance) by the customer MOC. They are not automatically transmitted to the customer MOC by the NCCDS. Revision 10 C-16 450-<strong>SN</strong>UG
Table C-4. Parameters Which Impact Forward Service Parameter or Operating Condition Forward Service Customer MA SSA KuSA/ KaSA Platform Reacquisition Required Forward Service Reacquisition X X X X Change in Customer Platform Receive Frequency Doppler Compensation Inhibit (PN Codes and Carrier) Reinitiation of Forward Service Doppler Compensation (PN Codes and Carrier) Forward Service Frequency Sweep (note 1) Change in Customer Platform Receive Antenna Polarization Initiation or Termination of the Command Channel PN Code Forward Service EIRP (Normal and High Power) TDRSS Reconfiguration or Resetup Required X X X X X X X X Note 4 Note 4 X X X Note 5 X X X X X X X X X X X X X X X X Note 2 X Change in Command Channel X X X Note 3 X Data Rate Notes: 1. This request is normally used as an aid in customer platform acquisition of the TDRSS forward service signal. 2. Reacquisition by the customer platform of the forward service signal may or may not be required (usually depends on whether there is a loss of lock condition within the customer platform receiver as a result of the step change in received TDRSS forward service signal energy). 3. If the initial and final data rate are
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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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10.4 Customer Platform Emergency Op
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operations. During a customer platf
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Appendix A. Example Link Calculatio
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A.3.2 Forward service link calculat
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User Spacecraft G/T (dB/K) 20 10 0
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. Required Eb /No is 9.9 dB (BER of
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Ideal Required Prec (dBWi) -150 -16
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Page 355 and 356: Ideal Required Prec (dBWi) -150 -16
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Page 405: C.4 Reacquisition C.4.1 Introductio
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Page 413 and 414: Appendix D. Spectrum Considerations
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Page 425 and 426: Figure D-4. NTIA Out-of-Band (OOB)
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Page 429 and 430: criteria for deep space operations
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Page 433 and 434: potential interference to other sys
Page 435 and 436: Annex to Appendix D D.A.1 Special C
Page 437 and 438: Table D.A-1. Peak Power Calculation
Page 439 and 440: Appendix E. Customer Platform and T
Page 441 and 442: 1. Jitter = None (Coded or Uncoded
Page 443 and 444: Figure E-8. QPSK Phase Imbalance id
Page 445 and 446: R max R ideal Figure E-11. Residual
Page 447 and 448: For forward service: O/ OUT AM / PM
Page 449 and 450: E.16 Out-of-Band Emissions Out-of-b
Page 451 and 452: E.21 PN Chip Rate PN code chip rate
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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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