Steve S. Re: [NGN97]
The BCR.com address below is the best I can give, the information
I posted came from my ATM News Digest subscription.
Subscription forms can also be found online. (http:www.atmdigest.com)
How about getting together for lunch again sometime soon?
Here's the latest:
JW@KSC
NGN97: NEXT GENERATION LOCAL LOOP TECHNOLOGIES
ADSL is past the trial phase and has become a serious business for
carriers and their suppliers, according to Leonard Yanoff, Product
Manager for Advanced Systems at Alcatel Data Networks. Yanoff
said DMT-based ADSL over ATM would prove to be the best solution
because of its high bit rates, its flexibility in overcoming
varying line conditions and noise, its support for multiple levels
of COS/QOS and its scalability. CAP-based ADSL will also be
standardized. Yanoff does not expect carriers to use IP over ADSL
directly because, he said, such approaches lack efficient
aggregation and multiplexing capabilities. At the customer end,
Yanoff said a PPP-over-ATM protocol stack would be incorporated
into Microsoft Windows 98, or offered by Hayes and other modem
vendors early next year. Jay Shuler, senior manager of carrier
ATM networks for Nortel, outlined the bandwidth requirements for
various WAN applications (Internet browsing, video, telemedicine,
teleradiology) as well as the performance characteristics of xDSL
solutions. A major constraint in xDSL performance, he said, will be
the loop length from the central office to the customer site. Shuler
does not expect that IP will be able to provide adequate QoS in
the WAN until bandwidth is so plentiful that it's free. John
Freeman, director of business development for Paradyne, outlined 3
different DSL network architectures: a centralized routed solution
(DSLAMs provide traffic aggregation and IP filtering, with
connections to routers via Fast Ethernet or ATM); a switched Vnet
solution (DSLAMs have 802.1q intelligence); a pure ATM solution
(requires customer ATM interface); a PPP-over-ATM solution
(protocol stack required from Microsoft or others). NGN97
conference materials, audio tapes and CD-ROMs are available for a
fee from the organizers. Contact Business Communications Review
(tel. 800/227-1234 bcr.com).
ATM !News Digest, November 7, 1997
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
NGN97: NEXT GENERATION BROADBAND ACCESS DEVICES
It is unrealistic to expect a large segment of the consumer market
to move from 28.8 modems to 8Mbps DSL services in the near term,
said David Helfrich, VP Marketing/Sales for startup
CopperMountain. Helfrich expects that only 1% or 2% of the 100
million phone lines in the US will be upgraded to a multimegabit
service by 2000, due to a variety of pricing, technical and
deployment constraints. He believes the "sweet spot" in the DSL
market will be in providing a business access solution between ISDN
and T1 speeds. A more bullish view was presented by Jerry Parrick,
CEO of startup Diamond Lane, who described the "land rush" currently
underway for the limited resources available in the deregulated
central offices. Parrick asserted that xDSL represents the best
chance for incumbent carriers to stop the coming "PSTN implosion,"
while for new competitive local exchange carriers it is the best
chance to get in the door with a multiservice offering. He
believes xDSL will be the killer ATM application. Rob Newman, CEO
of startup ATMosphere Networks, said that all of the last mile
access technologies would require carriers to build out capacity
in their metropolitan networks. His company is developing fiber
access rings that use a "thin layer of ATM" to provide much better
multiplexing than current add/drop SONET solutions.
ATM !News Digest, November 7, 1997 |
