Re: japanese internet, info

[Torben Nielsen <[e-mail]>]

	To:	[e-mail]
	Subject: japanese internet, info
	Date:	Fri, 9 Mar 90 22:17:43 HST
	From:	Edward Vielmetti <[e-mail]>
	Status: RO
	
	here's a map you should all know about: on the site
	utsun.s.u-tokyo.ac.jp, directory "/netinfo", file
	name "ip-map".  I don't have the software to print
	it, but someone with the X windows "kterm" client
	should be able to image it OK.
	
	The credit I have on it is to Hiroaki Takada,
	[e-mail]...if he's not on this
	list he arguably should be.
	
	>From a look at the ASCII parts of this document, most
	of the backbone is 64Kb, with a lot of 9.6 circuits
	in use.  

A couple of things you should be aware of concerning Japanese networks.
First, there are two major IP networks emanating from Tokyo now. TISN
and WIDE. TISN is a totally operational type network; i.e., it is just
a service provider. WIDE is more research oriented but also provides 
service.

It's often hard to tell the two apart. They interconnect here and there.
A lot of gated's are running to keep traffic flowing the way it's supposed
to.

When you see maps with 9.6Kbps circuits, there's a good chance that those
are NACSIS X.25 circuits. NACSIS is a Ministry of Education setup that
runs a nationwide X.25 network. Generally very low speed stuff. The 64Kbps
circuits you see on the maps are digital NTT lines.

Japanese maps are changing very rapidly right now. A few rules were
relaxed and this suddenly allowed connections that weren't possible
before. 

Currently about 40 IP networks come from Japan. No, they're not all seen
on the NSFNET yet. Thay haven't even all been given connected status yet.
A whole bunch of new ones came yesterday.

Currently Japan is a stub. But there's talk of rerouting the Korea link
to Japan and also of getting a link from Japan into Europe somewhere.

						Torben