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To: Perry Ganz who wrote (7018)	3/28/1999 12:42:00 AM
From: Educator	Respond to of 29970

Perry- ADSL vs. xDSL I did a little searching for you. I hope this link is able to clear up the differences between the two digital systems. Take care, Ed tuanz.org.nz

To: Perry Ganz who wrote (7018)	3/28/1999 2:29:00 AM
From: Boplicity	Respond to of 29970

There are so many variants of DSL that I use xDSL. The A stands for asymmetrical. Distance limitation are real and will not be solved, unless they move to a distributive like network, where CO like functions are moved closer the users. I have yet to hear anything like what I just described above being discussed by the REBOCS, or, for that matter anyone else. I like AWRE. You are right cable is a shared medium, and we have seen real world examples of bogged down cable access. But, it's way too early in the game to be talking about plagues yet. Greg

To: Perry Ganz who wrote (7018)	3/28/1999 12:16:00 PM
From: Frank A. Coluccio	Read Replies (4) \| Respond to of 29970

Perry, Re: ADSL and xDSL, some clarifications are required here. Educator, That was an interesting find, but unless New Zealand plays by a different set of rules, and they have their own lexicon on the topic (which they don't), then the article you cited was more fiction than substance. The "x" in xDSL connotes a broad range of Digital Subscriber Line (DSL) family members, and it is used as an expedient to cover the entire group, not as a discrete technology. ADSL is a member of this family. As is HDSL, VDSL, SDSL, etc. From the ADSL home page at: adsl.com , What is xDSL? XDSL is the name which as been coined for the family of digital subscriber line technologies ranging from HDSL through to VDSL (see accompanying Glossary) with ADSL firmly in the middle of the speed/capacity band. It may be useful to bookmark this site. ----- Greg, >There are so many variants of DSL that I use xDSL.< Congrats. You were more correct in the use of the 'x' signifier than you realized. Regarding your other observations, >>Distance limitation are real and will not be solved, unless they move to a distributive like network, where CO like functions are moved closer the users. I have yet to hear anything like what I just described above being discussed by the REBOCS, or, for that matter anyone else.<< As an FYI, such architectures actually do exist. Although they are not being deployed at this time with any regularity. Certainly not on a par with HFC or even regular CO-based xDSL. Provisions exist in the Bellcore GR-303 [which outlines the ~ Next Generation Digital Loop Standards] list of specs for digital subscriber services, whereby concentrators are located deep into the field in pedestals and other field enclosures (when normal DSL distance limits are exceeded) to support a wide range of subscriber services, including DSLs. One variant of this is the switched digital video (SDV) platform which employs VDSL at 52 Mbps to the residence to support 6.3 Mbps MPEG video and very fast Internet access, along with POTS voice and ISDN services. ALA, GIC/Next Level, and others have such platforms for sale, with several of them already deployed. The end game for this model is to deliver what its architects consider a full service area network, or FSAN. FSAN uses a variety of DSLs and passive optical network (PON) techniques to deliver all of the above. For more reading on FSAN, visit Telephony Magazine's article on this subject at: internettelephony.com Do a search at that site for FSAN. Frank_C.