Tokyu CATV (was Re: Metallic DSL in Tokyo)

[Alberto Tomita <atomita@example.com>]

At 15:30 00/10/25 +0100, you wrote:
>While I'm doing FAQish things, does anyone have any experience of cable
>modem companies, specifically Tokyu Cable?

Tokyu Cable http://www.catv.ne.jp

They use some sort of IP masquerading so that hosts inside their
net can not be seeing from outside. UDP packets are blocked at 
the gateway. IP addresses assigned by DHCP are in the private
address space. Their own Internet connection is provided by IIJ
through a 100Mbps link. Internally, they have a 622Mbps ATM
backbone connecting their 6 re-broadcasting stations. Bandwidth
from these stations to the cable modem is said to be 14.3Mbps
(the cable modem rental fee is included in the service, 5200 yen
per month, or 7000 yen/month for the Internet+CATV service --
CATV alone is 3800 yen/month). The cable modem brand is "Terayon"
http://www.terayon.com/products/cablemodem/modem.shtml
A hub can be connected to it, allowing more than one computer
to be on the net (they all get their IP addresses by DHCP).