IEEE 1355/SpaceWire Interworking with IEEE 802.11 for Space Craft November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 IEEE 1355/SpaceWire Interworking with IEEE 802.11 for Space Craft Date: 2005-11-14 Authors: Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. S. McCann & B. Cook S. McCann & B. Cook

November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 Abstract Introduction to interworking IEEE 1355/SpaceWire with IEEE 802.11 assisting the adoption of IEEE 802.11 within Space Craft. S. McCann & B. Cook S. McCann & B. Cook

November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 Introduction IEEE 1355/SpaceWire is an evolving standard for Space Craft use Several benefits to creating “SpaceWireless” Scenarios include: Wireless Data Handling Integration and Test Wireless Sensor Networks Harness Reduction Smart Sensors/Instruments (on board) Planetary Science Instruments (external) Microprobes Satellite Swarms IEEE 802.11 identified as one of the better wireless standards S. McCann & B. Cook S. McCann & B. Cook

IEEE 1355/SpaceWire : Introduction November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 IEEE 1355/SpaceWire : Introduction Standard for Heterogeneous InterConnect (HIC) Low Cost Low Latency Scalable Serial Interconnect IEEE 1355 specifies the physical media and low level protocols for a family of serial scalable interconnect systems. The speeds and media range from 10 Mbps to 1Gbps in both copper and optic technologies. Various of the specifications in IEEE 1355 are optimised for chip-to-chip, board-to-board, rack-to-rack or intra-office communications. SpaceWire is the middle speed copper form of IEEE 1355, an evolving standard for Space Craft wiring. S. McCann & B. Cook S. McCann & B. Cook

IEEE 1355/SpaceWire : Background November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 IEEE 1355/SpaceWire : Background The standard specifically aims to allow low cost and highly cost-effective simple implementations, and yet support scalable performance. This is achieved by a simple line protocol that can be implemented in as few gates as a UART, and by a simple packet protocol that can be used to make routing-switch chips to provide low latency wormhole routing. The cost, as with UARTs, is very low. Performance of a network with these routing switches scales with the size of the network, while retaining conservative and economical link speeds. <ftp://stdsbbs.ieee.org/pub/p1355/tutorial/1-overvi.pdf> S. McCann & B. Cook S. McCann & B. Cook

IEEE 802.11 Interworking : Why? November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 IEEE 802.11 Interworking : Why? Produce a wireless bridge between Space Craft components Reduce integration and testing time Reduce weight (Mass = launch cost) Ease interfaces with external entities Direct communications between SpaceCraft components and the ground An instrument or sensor on-board could look like another node to the ground network. Expand IEEE 802.11 market portfolio S. McCann & B. Cook S. McCann & B. Cook

IEEE 802.11 Interworking : How? November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 IEEE 802.11 Interworking : How? IEEE 1355 is an alternative PHY to IEEE 802.11 (therefore not in IEEE 802.11 scope -> IEEE 802.3) IEEE 1355 encapsulated in IEEE 802.11 (using IP ??) (not in IEEE 802.11 scope) Create IEEE 1355 – IEEE 802.11 bridge Possible small changes to both IEEE 1355 and IEEE 802.11 Synchronisation, 9bit – 8bit conversion etc IEEE 1355 still evolving IEEE 802.11 also still evolving (TGu, other groups) S. McCann & B. Cook S. McCann & B. Cook

November 2005 doc.: IEEE 802.11-05/1061r0 November 2005 Way Forward IEEE 1355 is representative of a whole number of niche physical wired standards: IEEE 1394 USB PCI – Express Fibre Channel As IEEE 802.11 evolves and market expands, does the market want to push it into these areas. IEEE 1355 Interworking Study Group? S. McCann & B. Cook S. McCann & B. Cook