I wouldn't be suprised if Japan had such a fast national network...considering their country is about the size of California. It's probably T1 or T3, Fiber-Optics can go way faster. Most colleges and universities have T1/T3 internet connections. Japan has way more than just Sony and cell phones. Matsushita? Panasonic? NEC Mitsubishi? There are a whole slew of Japanese countries that provide tons of technological products to us.
Speaking of internet connections...some future technologies that will rock your socks:
WiMAX promises to bring high-speed wireless broadband Internet access to the masses, and 802.16e promises to give you more than a 1Mbps connection from your car or moving vehicle.
Much like 802.16e, 802.20 brings WiMAX to mobile users. The difference? It's designed to deliver a connection even if you're moving as fast as 155 mph, so now you'll be able to shop online from your private helicopter.
BPL (Broadband over Power Line):
Forget using your phonelines or Co-Axial Cable plugs to get Internet, you can recieve High-speed Internet access from any power outlet in the house...awesome, huh?
Nothing new, the HomePlug concept is pretty old, but AV now allows up to 200Mbps to be networked through your power outlets.
The future is looking good.