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within the performance specified in Table 5-8. Contact Code 450 for additional information. e. Provide both QPSK and BPSK demodulation for PN spread signals. Return Channel Time Delay or any other measuring service is not available from DAS since signal delay is variable (output from DAS to NISN to the Customer is TCP/ IP) depending on loading and the extent of DAS processing desired. f. Provide beamforming, demodulating, data distributing and short term storage capabilities for each service. g. Provide automated operation of all DAS resources. h. Provide resource allocation accounting. i. Provide Commercial Off-The-Shelf (COTS) data and control interfaces for DAS customers with the flexibility of accommodating non-standard/customer-unique telemetry interfaces (e.g. use of dedicated T1s and/or fiber). j. Provide simple, modular beamforming, demodulating, routing and storage expansion functions, which can be modularly expanded to add DAS return link channels as needs change. k. Provide customers with the capability of obtaining dedicated DAS services. H.1.3 DAS Customer Categories DAS supports two classes of customers: dedicated and non-dedicated. Dedicated Customers are guaranteed requested support from the shared set of DAS resources. Non-Dedicated Customers receive “first come, first served” support from shared resources that remain after allocations have been made for the dedicated customers. A non-dedicated customer may be preempted by a dedicated customer when both services require the same resources. A customer that requires continuous (24x7) global coverage is a dedicated DAS customer. A dedicated customer may use DAS as a communications link to notify controllers of a spacecraft emergency (an “SOS” or “911” call), or to notify ground systems in real-time that some sort of science event occurred such as a gamma ray burst. DAS may be used to support multiple spacecraft flying in a single formation. DAS could form a beam that covers an entire group of spacecraft and multiple DAS receivers could be configured to relay the data from all of the emitters simultaneously with an independent stream for each emitter. For multiple emitters that are not in a single formation, DAS could be used to support polling of the emitters in a time-sequenced fashion. These types of customers could be supported by DAS as dedicated or nondedicated customers. Some customers may wish to start a service at a specific time or “upon demand” (ASAP). DAS can accommodate these types of customers on a nondedicated basis. Revision 10 H-2 450-SNUG
H.1.4 DAS Service Modes There are three DAS modes: Any -TDRS, All -TDRS, and Specific -TDRS. Each mode provides MAR services, but with slight differences in service performance and customer responsibilities. Details on how the customer interacts with GSFC Code 450 and the SN Access System (SNAS) to obtain DAS services are given in paragraph H.2, below. H.1.4.1 Any-TDRS Mode The Any-TDRS mode is defined as near-continuous global service coverage via three or more designated TDRSs with up to 15 second service gaps during TDRS-to-TDRS transitions. It is intended to support an orbiting spacecraft with an antenna system that can be directly controlled and pointed at a specified TDRS by MOC commands. The spacecraft antenna pattern(s) should have no antenna pointing restrictions in the direction of the target TDRS. Figure H-1 is a high level depiction of this mode. TDRS-Z TDRS-W TDRS-E GRGT Customer Platform WSC Figure H-1. DAS Any-TDRS Mode The Customer MOC initiates the service by submitting one schedule request (Resource Allocation Request (RAR)), via the SNAS interface, designating the "Any" service preference for the duration of the Project's mission support. No further schedule requests should be required. The DAS automatically selects which TDRS(s) will support the customer’s request for service and schedules the necessary resources. Scheduling information is created by Revision 10 H-3 450-SNUG MOC Only one of may be in use at one time
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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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Appendix B. Functional Configuratio
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Customer MOC SN Data Interface WDIS
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Revision 10 B-5 450-SNUG SN Ground
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Revision 10 B-7 450-SNUG SN Ground
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The SN return services are divided
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Revision 10 B-11 450-SNUG From chan
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Revision 10 B-13 450-SNUG From sing
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Revision 10 B-15 450-SNUG NRZ Only
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Revision 10 B-17 450-SNUG Table B-3
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The signal is transmitted using unb
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Appendix C. Operational Aspects of
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service PN codes (command and range
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Revision 10 C-5 450-SNUG Table C-1.
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Revision 10 C-11 450-SNUG Table C-3
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Revision 10 C-13 450-SNUG Table C-3
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C.4 Reacquisition C.4.1 Introductio
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Table C-4. Parameters Which Impact
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Customer MOC/NCCDS changes operatin
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. Initial acquisition not achieved
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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
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Page 443 and 444: Figure E-8. QPSK Phase Imbalance id
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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
Page 453 and 454: Appendix F. Periodic Convolutional
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Page 457 and 458: Appendix G. Predicted Performance D
Page 459 and 460: G.3.3 If the RFI environment become
Page 461 and 462: G.6 SSA and MA Forward Service RFI
Page 463: Appendix H. Demand Access System (D
Page 467 and 468: DAS provides service through each s
Page 469 and 470: modulation format. Acquisition by D
Page 471 and 472: H.1.5.3 Transmission Delays The ove
Page 473 and 474: Receiving service request responses
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Page 477 and 478: H.3.2 Communications Interface H.3.
Page 479 and 480: Upon determining that the request i
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Page 485 and 486: I.2.2 Non-IP Routed Data Services P
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Page 493 and 494: J.3 Acquisition For S-band DG2 nonc
Page 495 and 496: Appendix K. Use of Reed-Solomon Cod
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Page 503 and 504: N.3 Test Services Description Test
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Page 507 and 508: N.6.2 Test Scheduling The use of al
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Page 511 and 512: 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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