Victor you are absolutely right about learning something new. Man-o-man John, I'd rather believe you, but now I'm totally confused. Bellamy says T2 is B6ZS coded instead of being B3ZS coded.
And that the CCITT recommends HDB3 coding which is essentially B3ZS. Don't tell me that we have [#T-n (or #E-n)] times [#BnZS (or #HDBn)] = # combinations for anywhere in the world? John Combs wrote: > > 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.
