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Forums » Ericsson Promises 500Mbps DSL » Why is this news?
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tschmidt
Premium,MVM
join:2000-11-12
Milford, NH
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Why is this news?

VDSL2 has been around for several years. At 1500 feet speed is about 80 Mbps. Spec supports bonding two pairs to double data rate.

BBR article points out AT&T is planning to using pair bonding for U-Verse.
»telephonyonline.com/access/techn···uts_bet/

Vectorized VDSL sounds like a clever marketing term of little substance. 500/6 = 83 Mbps so all this seems to be is using six-pairs instead of two. For individual customers single pair is enough to deliver multiple HDTV channels along with Internet access. However this only works by installing Remote DSLAMs at substantial cost. One has to wonder at wisdom of continued massive investment prolonging life of copper plant vs overbuilding new fiberoptic outside plant optimized for data?

/tom
to forum · permalink · · 2009-03-17 10:44:27 · Reply to this

PDXPLT

join:2003-12-04
Banks, OR
said by tschmidt See Profile :

Vectorized VDSL sounds like a clever marketing term of little substance.
No, the "vectorized" part really is an additional technology tweak. The crosstalk coming from adjacent pairs is cancelled out, and that crosstalk is the major impairment that DSL has to overcome. It's akin to the MIMO technology used in 802.11n, and similar techniques used in 1G and 10G Ethernet.
to forum · permalink · · 2009-03-20 14:05:51 · Reply to this
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