[migration scenerios: dlc-onu/ adsl-vdsl]
hi darrell,
along the lines of the fsan (full service access network) vdsl stuff thought you or others might be interested in some thoughts on how orctf (and others) might get there or migration scenerios... any and all comments welcome...
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migration scenerios: dlc-onu/ adsl-vdsl
cribbing along the way from: "adsl and dsl technologies" by goralski.. (proofed by orctf's very own nigel cole)
in the spring of 97, at the time of their north american "alliance" announcement, orctf and fujitsu noted future planned integrated equipment which they were working on:
"...Fujitsu also presented a glimpse into the next stages of its DSL technology development. In 1998, the company said, it will offer VDSL and SDSL cards (also hdsl cards noted later on in this press release) that plug right into the FACTR Broadband Access Platform..... "This integration is aimed at those carriers who want to provide a fiber-to-the-neighborhood implementation. ...
fnc.fujitsu.com
.... have been watching and trying to understand what they were talking/hinting about for the last year and a half : in a nutshell believe orctf and fujitsu have been working on a way to interface xdsl with SONET/SDH rings (copper to fiber) from a remote site (beyond the central office) ... as part of a fiber fed digital loop carrier architecture (DLC).. or next generation DLC (NGDLC)...
if they are on schedule, early next year, believe we could be looking at a fujitsu optical network unit (ONU) which will have the functionality of the dslam (orctf's fast internet) built in along with a SONET add/drop multiplexer (ADM), some switching and routing capabilities , and a NGDSC or at least an interface for a NGDLC for digitizing analog voice for transport on the SONET ring...
in such an architecture, the end of the adsl service is not in the local exchange office, but in the DLC remote digital terminal itself where the digital info is passed onto the sonet ring on its own...
over time, many feel the local exchange or central office as we know it will become progressively less important or problematic as a bottleneck as this more distributed architecture (fiber to the neighborhood) becomes more widespread... which of course sets the stage for vdsl...
believe we could be looking at two interelated dsl migration scenerios: "from adsl in the local exchange to adsl in the next generation dlc equipment" and "from adsl delivered services to vdsl delivered services"
whether or not orctf and fujitsu will be be competitive remains to be seen, but they do seem to be working on the right stuff... for context probably worth noting that fujitsu has something on the order of 30 to 40% of the sonet/sdh market...
relevant dlc/onu portions of orctf related press releases:
from the recent dt press release 9/98:
"The FastInternet can migrate into the Full Service Access Network (FSAN) architecture required by Deutsche Telekom. Fujitsu, a leader in the field of fiber optic equipment, will integrate FastInternet into its Optical Line Terminations (OLTs) and Optical Network Units (ONUs) for this future architecture."
telechoice gte announcement 4/98?:
"...With regards to overcoming the DLC hurdle, GTE states that there are a fair amount of them in the network and that, with the help of Orckit/Fujitsu, they are working towards migrating to DLC-based services. Interestingly -- and in keeping with their commitment under this contract -- they are not, for instance, looking to Lucent, Nortel, etc. for DLC solutions..."
gte update 9/98:
"..GTE expects to extend service by early next year, following Fujitsu's expected delivery of DSL-access multiplexers (DSLAMs) for installation in the remote terminals served by digital-loop carriers (DLCs) . DSLAMs extend the reach of central-office switches beyond their local-loop bases..."
multichannel.com
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