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Bad." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Jun 2024 11:04:07 -0000 --------------p9Afb5N0Ex7ZCPHM2HFgkqWv Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 10/06/2024 2:38 pm, David Lang via Starlink wrote: > > the V2 were about 8-10x the capacity of the V1.5 (the ones they could > launch 50-60 per flight), the v2 mini they have been launching > (~22/flight) are about midway between the two. No recent word on the > V2s, but Tim Dodd did another starbase visit with Elon before the > flight, so watch for that to show up soon. I think it'd be useful we could agree on what we mean by "capacity" before we start throwing numbers around, especially relative ones. For Starlink, I can think of the following capacities (yes, plural): * User up-/downlink capacity from/to a single user. (How many bits/s can I throw at a Dishy?) * Downlink capacity to all users in a single cell (under the proviso that we don't have any users in adjacent cells that need / want service - think small island in the middle of the Pacific). * Overall user downlink capacity from a single satellite to multiple cells. (Can't deploy co-frequency beams with identical polarisation to the same cell if you have multiple such beams on your bird, but can do so if we can aim them at different cells) * Gateway uplink capacity (to users served directly by the satellite or indirectly via ISLs) * Gateway downlink (from users served directly by the satellite or indirectly via ISLs) * Dto. per gateway (see co-frequency beam issue) * Processing capacity: Number of bits / s that a satellite can pump between its receive beams / incoming ISLs and transmit beams / outgoing ISLs. It's getting late and I probably forgot one or two ;-) -- **************************************************************** Dr. Ulrich Speidel School of Computer Science Room 303S.594 (City Campus) Ph: (+64-9)-373-7599 ext. 85282 The University of Auckland ulrich@cs.auckland.ac.nz http://www.cs.auckland.ac.nz/~ulrich/ **************************************************************** --------------p9Afb5N0Ex7ZCPHM2HFgkqWv Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: 7bit
On 10/06/2024 2:38 pm, David Lang via Starlink wrote:

the V2 were about 8-10x the capacity of the V1.5 (the ones they could launch 50-60 per flight), the v2 mini they have been launching (~22/flight) are about midway between the two. No recent word on the V2s, but Tim Dodd did another starbase visit with Elon before the flight, so watch for that to show up soon.

I think it'd be useful we could agree on what we mean by "capacity" before we start throwing numbers around, especially relative ones. For Starlink, I can think of the following capacities (yes, plural):

  • User up-/downlink capacity from/to a single user. (How many bits/s can I throw at a Dishy?)
  • Downlink capacity to all users in a single cell (under the proviso that we don't have any users in adjacent cells that need / want service - think small island in the middle of the Pacific).
  • Overall user downlink capacity from a single satellite to multiple cells. (Can't deploy co-frequency beams with identical polarisation to the same cell if you have multiple such beams on your bird, but can do so if we can aim them at different cells)
  • Gateway uplink capacity (to users served directly by the satellite or indirectly via ISLs)
  • Gateway downlink (from users served directly by the satellite or indirectly via ISLs)
  • Dto. per gateway (see co-frequency beam issue)
  • Processing capacity: Number of bits / s that a satellite can pump between its receive beams / incoming ISLs and transmit beams / outgoing ISLs.

It's getting late and I probably forgot one or two ;-)


-- 
****************************************************************
Dr. Ulrich Speidel

School of Computer Science

Room 303S.594 (City Campus)
Ph: (+64-9)-373-7599 ext. 85282

The University of Auckland
ulrich@cs.auckland.ac.nz
http://www.cs.auckland.ac.nz/~ulrich/
****************************************************************
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