Stephen,
One aspect to the question you raised concerning DSL, which I omitted mentioning earlier, has to do with the paradoxical situation now taking place w.r.t. customers disconnecting their landlines in favor of alternative technologies and communicating modalities, and the availability of new dsl offerings that use multiple copper pairs to achieve higher throughputs.
Such "platooning" schemes (the use of multiple pairs in concert to achieve higher bit rates) would allow greater throughputs through inverse multiplexing schemes, as explained in the bolded portion of the release that follows. From converge digest:
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Metalink Shows Ethernet over SHDSL and over VDSL
Metalink is demonstrating 10 Mbps symmetric Ethernet over SHDSL. The service configuration uses four copper pairs carrying 2.5 Mbps and each using PAM 16 modulatiSon; or three pairs carrying 3.3 Mbps and each using PAM 32 modulation. Metalink said its solution can carry full Ethernet speed to a distance of 12 kft (4 km). Metalink is also showing its Fast-EoVDSL technology, which uses QAM line coding to enable bit rates of 60 Mbps downstream and 40 Mbps upstream.
metalink.co.il
02-Jun-03
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We've covered other vendors on this board who have released similar products in the past, some purporting to use as many as twelve to twenty four pairs of copper in order to achieve throughputs of up to 50 Mb/s and beyond over extended distances, in relative terms, to multi-dwelling units (MDUs) and so-ho locations. Elastic's anagramic cousin, Actelis, comes to mind.
Let's face it. With the proliferation of cellular/pcs, and with broadband wireless just around the corner, and with cable modem and fiber making increasing headway into users' homes (not just in oure numbers, but in the types of applications they can now support, as well, including voice), there will be lots of copper out there to be had that could easily be used in such platooning schemes. We'll very likely be seeing more of this as time goes by.
FAC |
