Fred;
> For the record, I'm sitting at this instant in Tokyo Station, and am on my
> way from Narita to Yokohama. I am sitting in the green car, and I accessed
> the appropriate web page.
Note that that is an experimental service of JR, itojun mentioned,
and has nothing to do with MIS service, I mentioned, subject line
of which you copied.
Anyway,
> I have wonderful 802.11 connectivity, and I have an IP address. Whether
> that means I can use the Internet is another question. On the parts of the
> track where the connectivity is there, we see ping round trip delays
> varying from 380 ms to over four seconds. There are fairly large parts of
> the track where the NTT DoCoMo 3G data connectivity appears to simply not
> be there - especially when in concrete tubes and ditches, but also on
> places with open track.
As you know, JR uses not IP mobility but telephone network mobility.
So, it is a problem of a plain old telephone system so called 3G. :-)
> So I think here the term "seamless", when applied to connectivity, doesn't
> really apply.
Direct WLAN service, today, has much less service area.
However, in the future, inexpensive base stations of WLAN are
essential to cover small holes of connectivity.
Masataka Ohta
