LSST communications middleware implementation

Dave Mills; German Schumacher; Paul Lotz

doi:10.1117/12.2233099

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27 July 2016 LSST communications middleware implementation

Dave Mills, German Schumacher, Paul Lotz

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Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 99065C (2016) https://doi.org/10.1117/12.2233099
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

The LSST communications middleware is based on a set of software abstractions; which provide standard interfaces for common communications services. The observatory requires communication between diverse subsystems, implemented by different contractors, and comprehensive archiving of subsystem status data. The Service Abstraction Layer (SAL) is implemented using open source packages that implement open standards of DDS (Data Distribution Service1) for data communication, and SQL (Standard Query Language) for database access. For every subsystem, abstractions for each of the Telemetry datastreams, along with Command/Response and Events, have been agreed with the appropriate component vendor (such as Dome, TMA, Hexapod), and captured in ICD's (Interface Control Documents).The OpenSplice (Prismtech) Community Edition of DDS provides an LGPL licensed distribution which may be freely redistributed. The availability of the full source code provides assurances that the project will be able to maintain it over the full 10 year survey, independent of the fortunes of the original providers.

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Dave Mills, German Schumacher, and Paul Lotz "LSST communications middleware implementation", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99065C (27 July 2016); https://doi.org/10.1117/12.2233099

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