Hi John,
Your mention of Japan's Broadband ISDN caught my interest. Maybe I'm showing my North American myopia (that sets in every so many years). But from my travels, B-ISDN really doesn't have a single protocol identified with it that I am aware of.
Rather (and I am pretty sure you know this already), it has been characterized, variously, as an umbrella term to describe some future (elusive) service that has the elements of all three: SONET/SDH, ATM and IN. Something that the Optical Switching Architectures look they are headed for, in fact.
One would imagine that somewhere in there there is an umbrella signaling network, as well. Like an overaly SS7 employing TCAP and ISUP, only called by different names.
To the best of my knowledge, unless one wishes to point to the Japanese attempt at it -- no singular variant of B-ISDN has taken shape thus far that has been referred to as "the" B-ISDN protocol, or protocol suite.
I'm curious about the deployment that you referred to, i.e., the B-ISDN that the Japanese rolled out. Is there a reference you can point us to that describes their results in some detail? Who manufactured the platform equipment, and what did it consist of? TIA.
FAC |
