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Implementing Real-time Provisioning for Space Link Extension (SLE) Service InstancesLokshin, Kirill, Puri, Amit, Irvin, Dana, Ross, Frank, Rush, Rebecca 10 1900 (has links)
ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California / Space Link Extension (SLE) is a set of recommended standards for mission cross support developed by the Consultative Committee for Space Data Systems (CCSDS). The SLE recommendations define protocols for extending the space link from ground terminals to other facilities deeper within a ground network, allowing distributed access to space link telecommand and telemetry services. The SLE protocols are widely used to provide cross support between sites, programs, and agencies. In traditional SLE deployments, individual service instances have been manually provisioned well in advance of the commencement of cross support for a particular mission, and hardware and software resources have been allocated to those service instances at the time of provisioning. While valid, this approach requires that dedicated resources be provided for each mission and service instance, and limits an SLE provider's ability to reallocate resources in real time based on system availability or other factors. This paper discusses an alternative approach to SLE service provisioning, in which individual service instances are assigned resources from a common resource pool at the time that each service instance is initialized. The paper addresses the key design elements and technical tradeoffs involved in this approach, and discusses the potential benefits with regard to load balancing, equipment reuse, and resiliency against system failure.
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Implementing Space Link Extension (SLE) for Very High Rate Space LinksLokshin, Kirill, Puri, Amit, Irvin, Dana, Ross, Frank, Rush, Rebecca 10 1900 (has links)
ITC/USA 2012 Conference Proceedings / The Forty-Eighth Annual International Telemetering Conference and Technical Exhibition / October 22-25, 2012 / Town and Country Resort & Convention Center, San Diego, California / Space Link Extension (SLE) is a set of recommended standards for mission cross support developed by the Consultative Committee for Space Data Systems (CCSDS). The SLE recommendations define protocols for extending the space link from ground terminals to other facilities deeper within a ground network, allowing distributed access to space link telecommand and telemetry services. The SLE protocols are widely used to provide cross support between sites, programs, and agencies. Traditional SLE protocol implementations have been limited in their ability to support high data rates and large numbers of concurrent service instances. Such limited solutions were sufficient to support the needs of spacecraft health and status or older, low-rate science data. More recent missions, however, have required significantly increased data rates on both uplink and downlink paths, necessitating a new approach to SLE implementation. This paper discusses the design principles involved in implementing the SLE protocols in support of high channel and aggregate mission data rates, with particular focus on the tradeoffs necessary to provide SLE link capability at sustained single-channel rates above 1 Gigabit per second. The paper addresses significant performance bottlenecks in the conventional SLE protocol stack and proposes potential mitigation strategies for them.
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CCSDS SPACE LINK EXTENSION (SLE) SERVICES -- OVERVIEW AND PROGRESS REPORTBrosi, Fred 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / CCSDS Space Link Extension (SLE) Services enable the ground segment assets of space
agencies to interoperate, allowing for ground stations and space data users to interact without
the need for ad hoc, complicated gateways designed specifically for each new mission. Their
goal is to reduce the development, management, and operational costs of providing cross
support between space organizations for exchange of tracking, telemetry, and command
(TT&C) data. SLE services are actively supporting over a dozen spacecraft, with many more
planned over the next few years.
This paper first presents an overview of the underlying SLE architecture, as defined in the
SLE Reference Model. The SLE data transfer services, which move data between mission
facilities and ground stations are defined, along with the management services that enable
missions to make requests for ground station services. Next, up-to-date status of the testing,
prototyping, and implementation of SLE services over the past few years is presented, as well
as plans for adoption of SLE services by a number of space networks and space mission
organizations. Finally, efforts to adapt SLE services to support legacy missions are briefly
described.
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CCSDS SPACE LINK EXTENSION SERVICE MANAGEMENT STANDARDS AND PROTOTYPING ACTIVITIESPietras, John 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / The Consultative Committee for Space Data Systems (CCSDS) is developing standards for the
interface through which spaceflight mission managers request tracking, telemetry, and command
(TT&C) and Space Link Extension (SLE) services from TT&C ground stations and networks. The
standards are intended for use not just by the spaceflight projects and networks operated by the
CCSDS member agencies, but also by commercial networks and networks operated by other
governmental agencies. As part of the process of developing the standards, several prototypes are
under development. This paper presents a summary status of both the emerging service request
standards and the prototypes that implement them.
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ACHIEVING DATA TRANSFER AND SERVICE MANAGEMENT INTEROPERABILITY IN SATELLITE CONTROL NETWORKSSunshine, Carl, Williams, Lance 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / A critical area for achieving interoperability between satellite control networks is the means chosen
to interconnect Satellite Operations Centers and remote antenna systems. The CCSDS Space Link
Extension (SLE) services are good candidates for this purpose, but national security space activities
have demanding requirements for accuracy of data transfer, controlled delay, and security, which
may not be fully achievable with the existing recommendations. The US Air Force developed a test
bed to evaluate the SLE protocols during live satellite contacts, for both data transfer and
management functions such as scheduling, configuring ground resources, and status reporting.
Performance was generally satisfactory, but several extensions were found to be necessary. The
SLE services provide a promising basis for use in ground stations to support both legacy Air Force
interfaces and newer standards based satellite control services.
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Non-Traditional Uses of the CCSDS Space Link Extension (SLE) ProtocolSafigan, Brian, Lokshin, Kirill, Puri, Amit 10 1900 (has links)
ITC/USA 2008 Conference Proceedings / The Forty-Fourth Annual International Telemetering Conference and Technical Exhibition / October 27-30, 2008 / Town and Country Resort & Convention Center, San Diego, California / Space Link Extension (SLE) is a set of Consultative Committee for Space Data Systems (CCSDS) recommended standards for extending the space link from ground stations to other spaceflight mission ground facilities over a ground network, allowing distributed access to space link telecommand and telemetry services. The currently defined and implemented SLE recommendations are oriented around a traditional CCSDS telecommand and telemetry protocol set, which uses discrete telecommand frames that are encapsulated in Communication Link Transmission Units (CLTUs) for transport over the ground segment, and telemetry data encapsulated in Transfer Frames at the spacecraft. This paper discusses several non-traditional uses of the SLE services. The applications addressed within lie outside the discrete packet telecommand/telemetry subset of the SLE recommendations that are fully defined by CCSDS. This paper will focus on the use of the currently implemented SLE model to enable the transport of other forms of data, which may be subject to various transmission constraints, across the ground segment.
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NASA/LOCKHEED MARTIN-CSOC GROUND NETWORK AND SPACE NETWORK INTEROPERABILITY TESTBEDMartinez, Lindolfo, Muzny, Larry 10 1900 (has links)
International Telemetering Conference Proceedings / October 20-23, 2003 / Riviera Hotel and Convention Center, Las Vegas, Nevada / NASA and Lockheed Martin-CSOC have been supporting in the development of plans for the
evolution of NASA’s Ground Network (GN) and Space Network (SN), and where possible,
synchronizing those plans with plans for the evolution of the Deep Space Network (DSN). This
paper describes a recommendation for a common ground system communication architecture based
on the Consultative Committee for Space Data Systems (CCSDS) Space Link Extension (SLE).
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