SN User's Guide - ESC Home - NASA

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P.1.2.1 Closed Server The SNAS Closed Server hosts most of the server applications; manages user login sessions, and the communications with NCCDS and DAS. P.1.2.2 Open Server The Open Server is a proxy server to allow users on the Open IONet and the Internet to connect to SNAS and to access TUT. User requests are directed to the Closed Server through the NISN Secure Gateway using a single predefined set of rules. This allows for the addition of new customers and users without the need for adding new Secure Gateway rules. Internet, Open IONet and Restricted IONet communications will be routed through the Open IONet server. P.1.2.3 Database Server The SNAS database will operate on a dedicated data server that communicates exclusively with the SNAS Closed Server. Database tables will hold static data, semistatic data and dynamically updated data. The static tables will store data that is rarely changed like TDRS names, SIC and SUPIDEN values. The data in the static table will be used for building display panels and for processing NCCDS or DAS messages. The dynamically updated tables will include messages from the NCCDS to the MOC, e.g. schedule result messages, and the MOC schedules. The customer will not have direct access to the SNAS server database. Regardless of the database application used, MOCs will not be allowed to create/issue/send SQL commands to the SNAS server database. P.1.2.4 Open TUT Server The SNAS will retrieve the current TUT information from the NCCDS and display it. SNAS provides the capability of “pushing” TUT updates to MOC Clients as the updates become available. The SNAS will also maintain a file with the current TUT information on the Open IONet Server and make this file accessible to authorized users via the public internet. The Open TUT Server data is updated hourly. P.1.2.5 Other Servers Software servers will be maintained on the Open IONet and the Closed IONet so that users can download the SNAS Client application to their client platform. SNAS will operate a local Certificate Authority (CA) on the Open IONet and the Closed IONet to support SSL connections between the SNAS servers and the MOC clients. Revision 10 P-3 450-SNUG
P.2 External Interfaces P.2.1 Network Control Center Data System (NCCDS) The SNAS communicates with the NCCDS on behalf of SNAS customers through implementation of the 452-ICD-SN/CSM protocol. All communications use TCP/IP. P.2.2 Auxiliary Network Control Center (ANCC) The SNAS interfaces with the ANCC to allow SNAS customers to perform interface testing and user training. P.2.3 Demand Access System SNAS accepts customer requests for DAS services. All DAS services are supported by SNAS. All communications between the SNAS and the DAS are specified in the 452- ICD-DAS/SNAS, Interface Control Document between the Demand Access System and the Space Network Access System. All communications between the DAS and the SNAS use TCP/IP. P.2.4 NISN Secure Gateway All communication between the SNAS Open Server and the SNAS Closed Server is channeled through the NISN Secure Gateway. When communicating with each other, the SNAS Open Server and the SNAS Closed Server employ protocols or communications techniques that are compliant with NISN Secure Gateway rules. The link between the SNAS Open Server and the SNAS Closed Server is the only communication link through the NISN Secure Gateway that SNAS uses. This link is independent of and isolated from links to SNAS MOC client workstations. Compatibility with the NISN Secure Gateway is not affected by the addition or removal of active SNAS MOC client workstations. P.2.5 SNAS MOC Client Workstation The SNAS MOC client workstation is considered an external interface because the platform is not part of the SNAS product. Multiple SNAS MOC client workstations can simultaneously access the SNAS servers in any combination of Internet, Open IONet, Restricted IONet and Closed IONet connections. P.3 SNAS Features and Operations P.3.1 MOC Client Features P.3.1.1 MOC Configuration The user will be able to display, edit and save individual interface configuration settings and user preferences. The MOC user will be able to set applicable thresholds for UPD parameters and alerts. Revision 10 P-4 450-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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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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Appendix D. Spectrum Considerations
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For most Space Network users, the a
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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
Page 465 and 466: H.1.4 DAS Service Modes There are t
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
Page 481 and 482: Appendix I. NASA Integrated Service
Page 483 and 484: Figure I-1. NISN/SN Legacy Interfac
Page 485 and 486: I.2.2 Non-IP Routed Data Services P
Page 487 and 488: Network Control Header Customer Hea
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Page 491 and 492: Appendix J. Customer Constraints fo
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 499 and 500: Appendix L. McMurdo TDRSS Relay Sys
Page 501 and 502: Appendix M. Deleted This page inten
Page 503 and 504: N.3 Test Services Description Test
Page 505 and 506: TDRSS component may require the who
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
Page 515: P.1 Major System Components P.1.1 C
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Page 521 and 522: SNAS MOC user will be able to speci
Page 523 and 524: The SNAS will allow a minimum durat
Page 525 and 526: the DAS Resource Allocation Request
Page 527 and 528: gateway and a proxy for the Closed
Page 529 and 530: Figure Q-1. WDISC Overview Q.2.1 IP
Page 531 and 532: database management, testing, troub
Page 533 and 534: In general, to obtain SN services,
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Page 537 and 538: Figure R-1. SN Gateway Overview Rev
Page 539 and 540: Figure R-3. WSC SN Gateway Interfac
Page 541 and 542: Table R-1. Comparison of Between WD
Page 543 and 544: Table S-1. TDRSS Forward Service Si
Page 545 and 546: Service Modulation Coding (2) Data
Page 547 and 548: Service Data Group DG2 (5) Phase Mo
Page 549 and 550: Service Data Group Mode Modulation
Page 553 and 554: Command Data Telemetry Data Ground
Page 555 and 556: And Data Handling (C&DH), referred
Page 559 and 560: Table U-1. TDRSS MAR Service Recomm
Page 561 and 562: Table U-2. TDRSS SSAR Service Recom
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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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