We've seen various input around the Web about WISPs' abilities to compete with "traditional" broadband providers. We've also seen input regarding the possible "demise" of BPL offerings due to interference and reliability issues. Now, we came across Om Malik's excellent overview of VDSL2.
Very High Bit Rate DSL 2 (VDSL2), a new standard is likely to be
ratified by next week, making it possible for carriers to provide upto
100 megabits per second connections (both up and down) over copper
lines. VDSL2 standard has been under review with the International
Telecommunications Union for sometime now, and the decision on the
standard could come early next week.
VDSL2 is really really fast. How fast? According to Ikanos estimates, it takes an “ADSL
network more than 45 minutes to transmit up to 50 high-resolution
photos at 3 Mb per photo. Sending the same number of photos can take
less than a minute over VDSL/VDSL2 networks.”
The big question is, of course: can
WISPs successfully compete with these offerings? We think so with the
right marketing, customer service/support, pricing, etc. We're not the only ones either. What do you think? Send in your comments below.
Overview of VDSL1/2, UDSL- Amended from Blueprint:
The
DSL technologies that can take advantage of the shorter loop lengths,
and thus larger usable bandwidths, provided by the FTTN architecture
are VDSL and UDSL. The VDSL1 standard uses band plans that define
spectrum usage up to 12 MHz, whereas the VDSL2 standard is expected to
define band plans and spectrum usage up to 30 MHz (see Figure 3). This
extra bandwidth will enable VDSL2 to theoretically provide aggregate
(sum of downstream and upstream) data rates greater than 200 Mbps on
very short loops. VDSL2 is the underlying standard for UDSL. Thus, UDSL
will provide at least these maximum data rates, in addition to full
flexibility in configuring between upstream and downstream.
Although the VDSL2 standard is still in development and targeted for
completion in the latter part of 2005, its performance is expected to
exceed that of VDSL1 as a result of the band plans with larger
bandwidth and features, such as higher transmit power, use of trellis
coding, more extensive diagnostics and improved impulse noise
protection.
As shown in Figure 4, VDSL2 (and hence UDSL) provides the highest data
rates on loops up to five to six kft. In North America, the majority of
loop lengths from the cross connect are less than this range. For loops
in the three to six kft range, more symmetric data rates will be likely
achievable with VDSL2 given expected additional flexibility in the
extent of the first upstream band in the VDSL2 band plans.
Figure 3. DSL Band Plans
Figure 4. xDSL Performance Comparison |
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