[Edinburgh-pm] Happy Birthday Television

[Robert Rothenberg]

The network wouldn't use TCP/IP.

https://secure.wikimedia.org/wikipedia/en/wiki/Interplanetary_Internet

On 23/01/11 17:04 Aaron Crane wrote:
> A Smith <asmith9983 at gmail.com> wrote:
>> We can discuss whether this 20th century television thing about to be
>> totally superceded by sending the signal via the Internet rather than
>> through the Ether.  It does mean that Mars Man won't be able to watch it,
>> unless he has a ultra-sensitive WiFi receiver.
> 
> Not even then.  The distance between us and Mars is never less than
> about 54 gigametres, and goes up to 400 Gm or so.  The speed of light
> is 1.8e12 furlongs per fortnight, or just shy of 300 Mm per second.
> So the distance to Mars is in the range 180..1334 light seconds, and
> therefore the minimum transmission time to Mars is 180..1334 seconds.
> However, RFC 793 specifies a Maximum Segment Lifetime for TCP of 120
> seconds; no TCP segment is permitted to be "active" in the
> internetwork for more than 120 seconds.  So, by definition, we can't
> do TCP to Mars. :-)
>