RE: Satellites running IP

[Lloyd Wood <[e-mail]>]

On Fri, 14 Jun 2002, Ahmed, Masuma wrote:

> Teledesic has design concepts for IP routing on-board

Teledesic's published material has discussed their own proprietary
protocol. Do you know of any public references supporting this?

(Actually, I'd quite like to know what Teledesic's current
 constellation design concept is...)

> and Astrolink has ATM switching capability on-board. However, none
> of these systems is flying today.

or fully designed?

> Existing commercial systems like
> Inmarsat and Cyberstar use IP interface at the ground to support
> Internet applications but the space itself is transparent to IP.
> NASA ACTS may be the only one today that supports on-board digital
> processing (e.g., SONET frames) and not bent pipe transponder
> systems.

a 'bent pipe' (okay, really regenerative rather than traditional
analogue-components freq-shifting) system can encompass dsp, of course
- Globalstar? Going digital makes switching between spotbeams much
easier...

As for on-board digital processing of frames, what does Iridium do?
(Okay, the frames aren't your usual network frames, but...)

thanks,

L.

putting 'bent-pipe' in the 'what goes up must come straight down'
category.

> Dr. Masuma Ahmed
> Business & Technology Strategy Leader
> Lockheed Martin, Management and Data Systems, WR
> 3200 Zanker Road, San Jose, CA 95134
> Tel: [phone]
> Fax: [phone]
> Email: [e-mail]

<http://www.ee.surrey.ac.uk/Personal/L.Wood/><[e-mail]>