1. IEEE 1355/SpaceWire Interworking with IEEE 802.11 for Space Craft
November 2005
doc.: IEEE /1061r0
November 2005
IEEE 1355/SpaceWire Interworking with IEEE for Space Craft
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S. McCann & B. Cook
S. McCann & B. Cook

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

3. November 2005
doc.: IEEE /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 identified as one of the better wireless standards
S. McCann & B. Cook
S. McCann & B. Cook

4. IEEE 1355/SpaceWire : Introduction
November 2005
doc.: IEEE /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

5. IEEE 1355/SpaceWire : Background
November 2005
doc.: IEEE /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

6. IEEE 802.11 Interworking : Why?
November 2005
doc.: IEEE /1061r0
November 2005
IEEE 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 market portfolio
S. McCann & B. Cook
S. McCann & B. Cook

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

8. November 2005
doc.: IEEE /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 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