E
CSS
24 January 2003
ECSS--E--50--12A
5
Introduction
General
SpaceWire technology has grown organically from the needs of on-board proces-
sing applications. This Standard provides a formal basis for the exploitation of
SpaceWire in a wide range of future on-board processing systems.
One of the principal aims of SpaceWire is the support of equipment compatibility
and reuse at both the component and subsystem levels. In principle a data-handl-
ing system developed for an optical instrument, for example, can be used for a
radar instrument by unplugging the optical sensor and plugging in the radar one.
Processing units, mass-memory units and down-link telemetry systems devel-
oped for one mission can be readily used on another mission, reducing the cost of
development, improving reliability and most importantly increasing the amount
of scientific work that can be achieved within a limited budget.
Integration and test of complex on-board systems is also supported by SpaceWire
with ground support equipment plugging directly into the on-board data-handl-
ing system. Monitoring and testing can be carried out with a seamless interface
into the on-board system.
SpaceWire is the result of the efforts of many individuals within the European
Space Agency, European Space Industry and Academia.
Purpose
This Standard addresses the handling of payload data and control information on
board a spacecraft. It is a standard for a high speed data link, which is intended
to meet the needs of future, high capability, remote sensing instruments and
other space missions. SpaceWire provides a unified high speed data-handling
infrastructure for connecting together sensors, processing elements, mass-mem-
ory units, downlink telemetry subsystems and EGSE equipment.
The purpose of this Standard is:
D to facilitate the construction of high-performance on-board data-handling
systems;
D to help reduce system integration costs;
D to promote compatibility between data-handling equipment and subsystems;
D to encourage reuse of data-handling equipment across several different
missions.
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