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To: lml who wrote (2358)	11/21/1998 7:10:00 PM
From: Bernard Levy	Respond to of 12823

lml: With respect to your question to Frank regarding DSL, you gain a huge amount in potential rates by pushing the fiber as far as you can towards the neighborhood you want to serve. Looking forward in the future, a fiber/VDSL combination will probably be the steady-state of copper technologies. Best regards, Bernard Levy

To: lml who wrote (2358)	11/21/1998 9:24:00 PM
From: Frank A. Coluccio	Read Replies (2) \| Respond to of 12823

lml, Bernard, the deep fiber, and xdsl model is epitomized by the Full Service Area Network Initiative as can be viewed in Telephony Mag's archive. Got to internettelephony.com ...and do a search for "FSAN." Be sure to examine the links at the bottom of the feature page titled FSAN Initiative. Sorry I couldn't be more exact with a URL, but that's the best I can do, given the way the site is set up. I'd like to digest the remainder of your message and get back to you at some later time.

To: lml who wrote (2358)	11/21/1998 11:31:00 PM
From: Frank A. Coluccio	Read Replies (1) \| Respond to of 12823

lml, >>What are ISDN BRI & 2B1Q extenders? Is this what I have on my line?<< Yes, very likely. Extenders are just another way to say repeaters or line boosters. BRI stands for Basic Rate Interface and consists of 2 Bearer channels for either or both data and voice, each at 64 kbps, and one lower speed Delta channel, typically rated at 16 kbps, for ancillary and supervisory signalling. Together these add up to 144 kbps of "apparent" signalling. Sometimes, depending on the configuration of the delivery system, the "actual" transmission rate is higher than 144, but the usable portion is still only 144 kbps. 2B1Q is the line format that is most often used to deliver the BRI signal to the end user location, and it stands for 2 Binary 1 Quaternary encoding. From: shiva.com : "The current standard is the American National Standards Institute (ANSI) 2B1Q line code. The line code groups two bits together and codes them in voltage levels of +3, +1, -1, -3 volts." The above cited Shiva link is very rich, and readable, with information pertaining to not only BRI, but to the primary rate interface (PRI) as well, and a whole swath of other related ISDN data. Enjoy, Frank C.