>Date: Wed, 9 Sep 1998 17:01:40 -0400 >From: "Victor L. Boersma" <[email protected]>
>Live and learn. I thought that the Japanese were the same as North America >all the way, BUT NO, at the DS-3 level they become deviant. > DS-3 32.064 Mbps 480 voice channels I wonder if that is actually used in Japan? The JATE "Green Book" Form U-III only mentions "Leased circuit (Super-high speed code) : 45, 50, 150 Mb/s," and all of those are optical, not on copper. I've tested DS-1 and DS-2 for Japan, and their DS-1 is now identical to North America. (They used to use CMI, but about nine years ago they started switching over to the technically-inferior AMI to be completely compatible with North America!) DS-2 never caught on in North America, but apparently NTT invested heavily in it in Japan. There is a difference, though. North American DS-2 uses B3ZS, and Japanese DS-2 uses B8ZS. ________________________________________________________________ John Combs, Senior Project Engineer, ITS/TestMark Laboratories Email: [email protected] URL: http://www.testmark.com
