Re: Re[2]: TCP over GEO < 512kbps

From: Geoff Huston ([email protected])
Date: Mon Nov 10 1997 - 18:13:26 EST


gees - if the satellite is that low you'd better duck :-)

Typically I see a 650ms delay on a round trip AU <-> US
which entails a path of AU -> spaceraft -> US -> spacecraft -> AU

regards,

    Geoff

At 10:27 AM 11/10/97 -0800, Jon Mansey wrote:
>Hi,
>
>Please excuse a newbie question, but where does the 0.6 derive from in
>these calcs? Is it the latency introduce by the trip up and back to the
>satellite? If so it seems rather high, my calcs give me more like 250ms.
>
>Puzzled,
>
>> to 65535 x 8/0.6s = 870Kbps. Solaris TCP/IP stack is able to open both
>> the transmit window/buffer and receive window/buffer upto 65535 bytes.
>>
>> So the maximum achievable throughputs will look like the following:
>>
>> Transmit_TCP_stack Maximum Throughput
>> Microsoft TCP: approx. 109Kbps
>> Solaris TCP approx. 870Kbps
>>
>
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