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SpaceWire is a spacecraft communication network based in part on the IEEE 1355 standard of communications. It is coordinated by the European Space Agency (ESA) in collaboration with several European space companies. Within a SpaceWire network the nodes are connected through low-cost, low-latency, full-duplex, point-to-point serial links and packet switching wormhole routing routers. SpaceWire covers two (physical and data-link) of the seven layers of the OSI model for communications. The Space Shuttle Discovery as seen from the International Space Station. ...
A telecommunications network is a network of telecommunications links arranged so that messages may be passed from one part of the network to another over multiple links. ...
IEEE-1355, IEC 14575, or ISC 14575 is a data communications standard, the IEEE Standard for Heterogeneous Interconnect (HIC). ...
ESA redirects here. ...
Lag is a common term used to describe a symptom often encountered in computing and especially networked systems, where results of actions appear much later than expected. ...
A duplex communication system is a system composed of two connected parties or devices which can communicate with one another in both directions. ...
This article or section does not cite its references or sources. ...
In computer networking and telecommunications, packet switching is a communications paradigm in which packets (messages or fragments of messages) are individually routed between nodes, with no previously established communication path. ...
Wormhole routing is a system of simple routing in computer networking based on known fixed links, typically with a short address. ...
The Open Systems Interconnection Basic Reference Model (OSI Reference Model or OSI Model for short) is a layered, abstract description for communications and computer network protocol design, developed as part of the Open Systems Interconnection (OSI) initiative. ...
Architecture
SpaceWire's modulation and data formats generally follow the data strobe encoding - differential ended signaling (DS-DE) part of the IEEE Std 1355-1995. SpaceWire utilizes asynchronous communication and allows speeds between 2 Mb/s and 400 Mb/s. DS-DE is well-favored because it describes modulation, 8B/10B_encoding bit formats, routing, flow control and error detection in hardware, with little need for software. SpaceWire also has very low error rates, deterministic system behavior, and relatively simple digital electronics. SpaceWire replaced old PECL differential drivers in the physical layer of IEEE 1355 DS-DE by low voltage differential signaling (LVDS). SpaceWire also proposes the use of space-qualified 9-pin connectors. SpaceWire and IEEE 1355 DS-DE allows for a wider set of speeds for data transmission, and some new features for automatic failover. The fail-over features let data find alternate routes, so a spacecraft can have multiple data buses, and be made fault tolerant. SpaceWire also allows the propagation of time interrupts over SpaceWire links, eliminating the need for separate time discretes. Econdin the process of the receptor able to transmit data effectively and Data strobe encoding (or D/S encoding) is an encoding scheme for transmitting data in digital circuits. ...
It has been suggested that this article or section be merged into Low voltage differential signaling. ...
Asynchronous communication can be non-electronic or electronic. ...
In telecommunications, 8b/10b is a line code that maps 8-bit symbols to 10-bit symbols to achieve DC-balance (see DC coefficient) and bounded disparity, and yet provide enough state changes to allow reasonable clock recovery. ...
The flow control mechanism is used for controlling the flow of data in a network under well-defined conditions, while congestion control is used for controlling the flow of data when congestion has actually occurred . ...
In computer science and information theory, error correction consists of using methods to detect and/or correct errors in the transmission or storage of data by the use of some amount of redundant data and (in the case of transmission) the selective retransmission of incorrect segments of the data. ...
Positive Emitter Coupled Logic, or PECL, is a further development of the emitter coupled logic (ECL) technology and requires a positive 5V supply instead of a negative -5V supply. ...
Low voltage differential signaling, or LVDS, is an electrical signaling system that can run at very high speeds over cheap, twisted-pair copper cables. ...
Failover is the capability to switch over automatically to a redundant or standby computer server, system, or network upon the failure or abnormal termination of the previously active server, system, or network. ...
Fault-tolerance or graceful degradation is the property of a system that continues operating properly in the event of failure of some of its parts. ...
Uses SpaceWire is not only used in ESA projects, but also in some NASA spacecraft [1]. For example, it is being used in the James Webb Space Telescope, Swift's Burst Alert Telescope, or the Geostationary Operational Environmental Satellite. SpaceWire initiatives are being co-ordinated between several Space Agencies like ESA and NASA in the frame of CCSDS in order to extend its communication model to the Network and Transport Layers of the OSI model. This article is about the American space agency. ...
The James Webb Space Telescope (JWST) is a planned space infrared observatory, intended to be a significant improvement on the aging Hubble Space Telescope. ...
The Swift Gamma-Ray Burst Mission consists of an unmanned spacecraft called Swift, which was launched into orbit on November 20, 2004, at 17:16:00 UTC (12:16 PM, EST) by a Delta 2 7320-10C expendable launch vehicle. ...
The Swift Gamma-Ray Burst Mission consists of a robotic spacecraft called Swift, which was launched into orbit on November 20, 2004, at 17:16:00 UTC (12:16 PM, EST) by a Delta II 7320-10C expendable launch vehicle. ...
The Geostationary Operational Environmental Satellite (GOES) program is a key element in United States National Weather Service (NWS) operations. ...
CCSDS Logo (NASA) The Consultative Committee for Space Data Systems (CCSDS) is an international organization of major national space agencies and industry partners formed in 1982 that peacefully cooperate in the development of standards to promote interchange of space-related information. ...
Protocols The ESA has a draft specification in place for the Protocol ID.
The following Protocol ID's have been assigned:
- 1: Remote Memory Access Protocol (RMAP)
- 2: SpaceWire working group on reliable transport protocol
- 238: Proposal for Reliable Data Delivery Protocol (RDDP) (used on GOES-R)
- 239: Serial Transfer Universal Protocol (STUP) (Used on SMCS-332 ASIC)
The Geostationary Operational Environmental Satellite (GOES) program is a key element in United States National Weather Service (NWS) operations. ...
The acronym ASIC, depending on context, may stand for: Application-specific integrated circuit ASIC programming language Australian Securities and Investments Commission This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same title. ...
References - ECSS-E-50-12: SpaceWire - Nodes, links and networks, ESA-ESTEC.
- Draft ECSS-E-50-11: SpaceWire - Protocols
ESA redirects here. ...
The European Space Research and Technology Centre (ESTEC) is ESAs main technology development and test centre for spacecraft and space technology. ...
External links Commercial providers of SpaceWire equipment: NonCommercial providers of SpaceWire: Articles: |
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