"Andrew Swallow" <am.swallow@btopenworld.com> wrote in message
news:rdCdnd6hEL6jWb_bnZ2dnUVZ8tOmnZ2d@bt.com...
> Dana wrote:
> [snip]
>
>> As for the delay, that will still be there, as you have to get up and
>> back to the satellite, On VSATS in the field and my own satellite
>> connection at the house here in Alaska, I have seen delays up to 2 doing
>> ping.
>
> If done properly routing in the satellite will half the delay.
>
> Previous systems did it one of two ways.
>
> 1. Subscribe A to satellite and the satellite broadcast the data to
> everyone.
> 2. Or Subscriber A to satellite, satellite forwards data to a military
> base somewhere. The routing computer at the military base decides
> which one of its satellites to send the data to. Base sends data
> to satellite and the satellite forwards data to Subscriber B.
> This requires four 36,000 mile hops and 4 radio frequencies.
>
> The new satellite appears to contain its own routing computer.
> New way. Subscriber A to satellite. Satellite examines the Call
> Request and looks in its data base for Subscriber B. If B is
> within the foot print then the satellite calls Subscriber B.
> This requires two 36,000 mile hops and 2 radio frequencies.
>
> The is only a small advantage in having tactical routers but big
> advantages in strategic and logistics routers. The front line
> Lieutenant can send an email back to the USA.

They are doing that with VSATS, and have been for years.

>
> Andrew Swallow