Discusses the interplanetary internet and delay-tolerant networking in orbit with the CLEO and IRIS routers, LED intersatellite links and handovers in satellite constellations.
Thoughts on research for space networking (1.85MB) On video, on YouTube.
Satellite channel losses
Satellite channel losses (670K)
Discusses the Interplanetary Internet.
Interplanetary Internet (1.2M) On video.
Also given as a Surrey Space Centre lecture to their Spacecraft Avionics students, 8 December 2023. (via Chris Bridges. widescreen slides, 6.8M)
And afterwards, I judged the Christmas jumper competition.
Turning HTTP into a standalone layer: decoupling HTTP from TCP (112K)
- Cisco w kosmosie (in Polish), Rozmawiali Krzysztof Jakubik and Rafal Janus, Net focus, 18 November 2009.
- Kosmiczny router Cisco (in Polish), Janusz Chustecki, IT Partner, from IDG News Service, 8 July 2009.
- Geeks in space (in Polish), Cisco Forum blog, 26 March 2009.
Taking Cisco to space (13MB)
Also given as a Networks and Services group talk at Electrical Engineering, University College London (via George Pavlou and Richard Clegg - announcement), 4pm, Friday 16 January 2009.
Implementing the Interplanetary Internet: differing approaches (7.7M)
Uses SaVi and ns satellite constellation plot scripts. See also earlier constellations tutorial.
A tutorial discussing and illustrating the geometrical and orbital choices for multiple satellites, and how these choices and the resulting satellite coverage and diversity play into system design choices for various satellite applications.
Constellations - orbital types, uses and advantages (5.9M)
Link properties advertisement from modem to router (70K)
Using HTTP for delivery in Delay/Disruption-Tolerant Networks (94K)
ANCP for wireless environments (249K)
IETF 69, Chicago, July 2007.
Describes Saratoga.
Saratoga: a bundle convergence layer (1.8M)
Introducing Saratoga (2.4M)
Practical use of the Internet Protocol to command satellites and payloads (4M)
Note: Pass figures are rounded approximations. It's actually a 12 minute pass * 8140800bps = 715MB, or just over 650MB (a CD-ROM's worth) that can be downloaded each pass once framing overheads are taken into account.
Data routing and transmission protocols (3.9M)
As a guest lecturer, gave a three-hour workshop at the International Space University summer session '06 in Strasbourg, France, 12 July 2006 (via Bill Cowley). Introduced satellite constellations, then let students work on simple exercises in creating constellations using SaVi. Also spoke on slot clouds and on CLEO.
Work done on SaVi for this workshop led to the release of SaVi 1.3 (diary entry). Uses ns satellite constellation plot scripts.
See also later constellations tutorial.
Introduction to satellite constellations (4.1M)
ISU student introduction to SaVi (309K), which became the SaVi user manual.
ISU student exercises with SaVi (66K)
Solutions to ISU student exercises with SaVi (96K)
ISU talk on slot clouds and intersatellite links (494K)
ISU talk on CLEO Cisco router in Low Earth Orbit (9M)
A commercial mobile router was integrated into the UK-DMC satellite, and has been on orbit with the satellite for over two years. The talk overviews over a year of successful testing of the router, along with the developments in extending the Internet to orbit and building Internet-Protocol-enabled satellite infrastructure that made this router integration possible (and even easy) in the first place. Possible future steps are also discussed.
Testing the Cisco router in orbit slides, presented Tuesday, 15 November 2005.
(landscape A4, 8M)
- IET Seminar on Military Satellite Communication Systems, 12 June 2008. (slides in IEEExplore) On video.
- MSc student seminar, Dept of Computer Science, University College, London, 31 October 2006.
- CAIA seminar, Centre for Advanced Internet Architectures, Swinburne University of Technology, Melbourne, 8 February 2006.
- COST 272 final meeting along with slot clouds (via Laurent Franck), ISTI, Pisa, Italy, Friday 26 August 2005.
- MICSSA 2005, Pretoria, South Africa, Thursday 28 July 2005.
- Center for Satellite and Hybrid Communication Networks Advanced Networks Colloquium Series, University of Maryland, Monday 6 June 2005 (details, campus flyer).
- IEE Sussex Branch (via Derek Wright), Hawth Studio, Crawley, Wednesday 6 April 2005 (February 2005 IEE Sussex newsletter).
- MICSSA 2003, Pretoria, Thursday 13 November 2003.
- Centre for Telecommunications Access and Services, University of the Witwatersrand, Thursday 27 November 2003.
- TRC mathematical modelling centre, University of Adelaide, Tuesday 7 October 2003.
- Institute for Telecommunications Research, University of South Australia, Wednesday 8 October 2003 (details, also noted in the 2003 ITR annual report).
- CUBIN, University of Melbourne, Thursday 9 October 2003 (Annual Report 2003, p. 29).
- Centre for Advanced Internet Architectures, Swinburne University of Technology, Thursday 9 October 2003.
- CUBIN Melbourne campus flyer, September-October 2003.
(100K, portrait A4)
A personal perspective on areas of satellite networking.
- Some topics in satellite networking slides, presented Friday, 28 February 2003
(913K, landscape A4)
- campus flyer, week of 24-28 February 2003
(76K, portrait US letter)
Some thoughts after gaining experience using the network simulator ns.
- A user's view of ns slides, presented
Tuesday, 1 June 1999 (141K, landscape A4)
Overview of my research topic with background.
- A networking perspective on satellite constellations slides, presented
Thursday, 10 December 1998 (301K, landscape A4)
A discussion of the utility of network address translation. Detailed further in the IJSC routing issues paper that resulted from my stay at INRIA.
- IP routing and QoS in satellite constellations slides, presented
Friday, 4 December 1998 (42K, landscape A4)