Re: World's First Fuel Cell-Powered Train Locomotive Slated for 2008

From: Ian St. John (istjohn_at_noemail.ca)
Date: 08/19/04 

Date: Thu, 19 Aug 2004 01:19:50 -0400

Scott A Crosby wrote:
> On Wed, 18 Aug 2004 21:59:58 -0400, "Ian St. John"
> <istjohn@noemail.ca> writes:
>
>>> And Ethernet is not the sole end of TCP/IP. One is a media layer,
>>> the other is up from that (TCP is actually a separate layer 'on top'
>>> of the IP layer). TCP/IP can be (and often is) run over other media
>>> layers besides Ethernet (e.g. TokenRing, Apple-Talk, even simple
>>> UUCP).
>>
>> Point is that internet is layered on Ethernet. No foundation, no
>> layer.
>
> End-host connectivity to the internet has usually been Ethernet,
> though with Wavelan, that may change. This was done because ethernet
> was cheap and 'good enough' for local area networking. But once data
> leaves the LAN, its going over ADSL, SDSL, T1, T3, WDM, DWDM, OC-3,
> OC-48, OC-192, PPP links or any of another dozen L2 link-layer
> protocols. Although Gigabit Ethernet has 'Ethernet' in its name, I
> don't believe it uses a shared medium for communication, making
> calling it with the term 'Ethernet' a misnomer. As it is, with modern
> switched full-duplexed networks, 100baseT Ethernet is effectively a
> point-to-point protocol with no collision or physical-layer link
> contention.
>
> FYI, the Kahn and Cerf paper outlining TCP is two years older than the
> first drawing by Metcalf describing ethernet.

Sure. You can use anything from the orignal thick ethernet to Janet (
parallel port network ) to .. I started my career on those technologies.

But the point remains that America is slow to adopt change except in areas
that are 'empty' and even then they tend to have instances of brain fatigue.
An awful lot of research comes from the EU and they tend to adopt useful
technology faster, despite the example of www which wasn't really 'planned'
so much as 'happened'.

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