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Topic: VDSL

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	VDSL Tutorial
		VDSL must be lower in cost and lower in power, and premises VDSL units may have to implement a physical layer media access control for multiplexing upstream data.
		VDSL is still in the definition stage; some preliminary products exist, but not enough is known yet about telephone line characteristics, RFI emissions and susceptibility, upstream multiplexing protocols, and information requirements to frame a set of definitive, standardizable properties.
		VDSL will not be completely independent of upper layer protocols, particularly in the upstream direction where multiplexing data from more than one CPE may require knowledge of link layer formats (that is, ATM or not).
	www.dslforum.org /aboutdsl/vdsl_tutorial.html (2568 words)

	VDSL - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-10-09)
		VDSL (very high bit-rate DSL) is an xDSL technology providing data transmission up to a theoretical limit of 52 Mbit/s downstream and 12 Mbit/s upstream over a single twisted pair of wires.
		Belgacom is providing VDSL in parts of the country (about 6% coverage), but limited to 9 Mbit/s down, 400 kbit/s up and with a monthly download limit of 30 GiB.
		VDSL is offered in many areas by NTT, Japan's largest telco, in addition to other providers, in conjunction with FTTH service.
	en.wikipedia.org /wiki/VDSL (465 words)

	broadband » Forums » Dallas/Fort Worth » Re: Is VDSL worth the 20 day wait, or should go cable?
		What's being installed in Japan is VDSL, which is very fast indeed, but not as well suited to the U.S. phone market where most of my readers are.
		VDSL requires a pristine phone line and even then supports that 26 megabit speed over a maximum of only 4,000 feet, and practically, over less than 1,000 feet.
		Both it and VDSL are best suited to networks with fiber to the curb, or at least, fiber to the neighborhood.
	www.dslreports.com /forum/remark,7860828 (345 words)

	Howstuffworks "How VDSL Works"
		VDSL provides an incredible amount of bandwidth, with speeds up to about 52 megabits per second (Mbps).
		Compare that with a maximum speed of 8 to 10 Mbps for ADSL or cable modem and it's clear that the move from current broadband technology to VDSL could be as significant as the migration from a 56K modem to broadband.
		As VDSL becomes more common, you can expect that integrated packages will be cheaper than the total amount for current separate services.
	www.howstuffworks.com /vdsl.htm (448 words)

	CommsDesign - 10 Reasons to Choose DMT for VDSL Designs
		VDSL DMT modems maximize data throughput by dynamically adapting the power level and payload size of each sub-carrier to match noise conditions.
		VDSL DMT modems run adaptation algorithms to accommodate these changes by altering the allocation of bits from 'noisy' to 'less noisy' parts of the spectrum.
		In VDSL QAM, three variables--the center frequency, the constellation size (QAM2 to QAM256, or the number of different phase and amplitude permutations), and the symbol rate (or the number of transition of these permutations in a given timeframe)--are programmed to optimize the use of a particular channel.
	www.commsdesign.com /story/OEG20020514S0009 (2660 words)

	VDSL - susning.nu (Site not responding. Last check: 2007-10-09)
		VDSL kan erbjuda en hastighet på upp till 52 Mbit/s nedströms.
		Med VDSL så är det ju mycket mer flexibelt att bara koppla in i telefonjacket.
		Några leverantörer har börjat leverera VDSL på några stora orter i Sverige.
	www.susning.nu /VDSL (437 words)

	Marconi Pacific: Consulting Services
		VDSL provides Telcos the technology to compete in the residential market for bundled voice, data and video services using copper infrastructure without having to install fiber-to-the-home.
		VDSL is one of the most promising technologies to emerge in the current telecommunications market.
		VDSL is the only DSL technology with enough bandwidth to support bundled digital broadcast TV for multiple TVs, data services and POTS on a single copper line to the home.
	www.marconipacific.com /VDSL.htm (1069 words)

	Analog Devices: Analog Dialogue: VDSL Technology Issues—An Overview
		Due to the large attenuation of high frequency signals on twisted-pair lines, the deployment of VDSL is limited to a loop length of less than 4500 feet from the signal source.
		VDSL signals from the ONU may generate unacceptable noise levels for the ADSL downstream signal, as it becomes heavily attenuated along the path from CO to ONU [1].
		VDSL interference in the radio amateur bands can be restricted by limiting the power spectral density of the VDSL signal in these bands to 80 dBm/Hz.
	www.analog.com /library/analogdialogue/archives/34-05/vdsl/index.html (1894 words)

	CommsDesign - Choose Wisely Between QAM and DMT for VDSL
		VDSL is typically deployed from a fiber trunk that reaches the curbside or an in-building wiring cabinet.
		VDSL runs in elevator shafts, on in-building wiring and in other "communication-unfriendly" places, and is therefore subject to long bursts of noise (impulse noise).
		Because VDSL is not a simple technological upgrade to ADSL, it is not really valid to argue that interoperability with the ADSL systems in place today should be the paramount driver of modulation technique decisions.
	www.commsdesign.com /design_corner/OEG20020903S0030 (2401 words)

	Broadband VDSL \| Metalink (Site not responding. Last check: 2007-10-09)
		Broadband VDSL Metalink as a leader in the field of broadband access dsltv broadband speed tests.
		Broadband vdsl access adsl broadband access systems high speed cable access broadband support - which broadband, broadband access networks (broadband web broadband video phone broadband tv broadband vdslplus chipsets for access switch isp dialup vdslplus is today's most advanced dsl technology various xdsl access solutions for synergistic markets such as the broadband access.
		Broadband vdsl advancement in broadband access technology broadband phone access dsl broadband solutions high speed internet access cable enabling wireless video home networking at over 200 mbps combined with its upcoming wire skip..
	www.metalink.co.il /site/pro/broadband-vdsl.html (659 words)

	broadband » Forums » Bell Sympatico » VDSL and fastpath/interleave
		So it appears that VDSL on interleave is around 30ms hop, a 20ms on average improvement on G.DMT ADSL.
		VDSL physical layer provides support for dual latency channels commonly referred to as the fast and interleaved channels.
		VDSL Is different because there is fiber's running to the premises there is only coper in the building anything outside of the building going to Co is fiber.
	www.dslreports.com /forum/remark,12914449~start=32~mode=flat (903 words)

	Howstuffworks "How VDSL Works" (Site not responding. Last check: 2007-10-09)
		VDSL operates over the copper wires in your phone line in much the same way that ADSL does, but there are a couple of distinctions.
		The key to VDSL is that the telephone companies are replacing many of their main feeds with fiber-optic cable.
		It converts the data received from the transceiver into pulses of light that can be transmitted over the fiber-optic system to the central office, where the data is routed to the appropriate network to reach its final destination.
	computer.howstuffworks.com /vdsl3.htm (318 words)

	VDSL
		The VDSL debate is between the Alliance, http//www.vdslalliance.com/, which is advocating a DMT approach and is led by Texas Instruments and Alcatel, and the Coalition, http//www.vdsl.org/ with Lucent, Broadcom, and Infineon, preferring QAM.
		VDSL offers tremendous promise as the means to provide the next generation of high-speed networking technology over copper telephone lines.
		Another issue for VDSL deployment is bridged taps, a disturbance that is inherent in POTS-wired neighborhoods where local lines may not be terminated (a specific problem to the North American market place and not experienced in Europe).
	www.dslprime.com /News_Articles/a/VDSL/vdsl.html (4029 words)

	What is VDSL? - A Word Definition From the Webopedia Computer Dictionary
		VDSL is currently going through a standards issue, so it isn't widely deployed yet.
		The VDSL alliance favors a line coding scheme based on Discrete Multitone (DMT), a multi-carrier system that is more compatible with existing ADSL technology.
		The VDSL coalition favors a line coding scheme based on Quadature Amplitude Modulation (QAM), a single-carrier system that is less expensive and consumes less power.
	www.webopedia.com /TERM/V/VDSL.html (195 words)

	Fears grow over impact of VDSL delay on business - vnunet.com (Site not responding. Last check: 2007-10-09)
		Harrington added that VDSL is a viable alternative to leased lines for larger businesses: "VDSL is a long way off and the size of the market will depend on what BT decides to charge for it.
		Suitability testing BT is running VDSL tests at its Martlesham research centre and has tested several thousand lines for suitability, but it has not announced a definite rollout of the technology.
		VDSL CAPABILITIES - Over 300m of copper: 52Mbps downstream and 6.4Mbps upstream, or 26Mbps symmetric - Over 1,000m of copper: 26Mbps downstream and 3.1Mbps upstream, or 13Mbps symmetric - Over 1,500m of copper: 13mbps downstream 1.6Mbps upstream, or 7.5Mbps symmetric.
	www.vnu.co.uk /analysis/104882 (791 words)

	DSL Broadband Access \| Metalink (Site not responding. Last check: 2007-10-09)
		Broadband access vdsl broadband access europe, - broadband video phone) reference design documents for cpe and access concentrator will integrate metalink's long broadband modems demand what is broadband internet access isp streaming stream digital video services streams.
		Broadband access vdsl music video broadband isp broadband isp wireless broadband access cable broadband access broadband web, streaming broadband review broadband network service access dsl high speed internet access broadband access provider access isp vdsl technology into its new broadband access product family broadband speed tests metalink broadband ltd data.
		Broadband access vdsl broadband networking including cable modem adsl broadband advanced service package for the broadband home broadband high speed internet access, video satelite broadband will incorporate metalink's long.
	www.metalink.co.il /site/pro/dsl-broadband-access.html (663 words)

	VDSL Solutions, VDSL Modems, VDSL Switches, Fiber Optic Cable, Fiber Optic Switches
		VDSL is targeted at supporting shorter distances than ADSL with higher bit-rates: Up to 51 Mbps at 300 meters (1,000 ft.), and up to 13 Mbps at 1.5 km (4,500 feet).
		VDSL is seen ads an infrastructure for future services and it cannot be a best effort service based on a temporary status of a copper bundle.
		The noisy environment in which VDSL is deployed, and the limited transmission power, creates a situation in which VDSL must be able to adapt to changing noises and in some cases even perform a restart of a link.
	www.americantechsupply.com /vdslintro.htm (2504 words)

	What is ADSL and VDSL
		VDSL technology resembles ADSL to a large degree, although ADSL must face much larger dynamic ranges and is considerably more complex as a result.
		VDSL must be lower in cost and lower in power, and premises VDSL units may have to implement a physical-layer MAC for multiplexing upstream data.
		VDSL achieves data rates nearly 10 times greater than those of ADSL (shown in Figure 15-8), but ADSL is the more complex transmission technology, in large part because ADSL must contend with much larger dynamic ranges than VDSL.
	www.pulsewan.com /data101/adsl_vdsl_basics.htm (3866 words)

	VDSL -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-09)
		As of 2004, the market is still small, except in (A republic in the southern half of the Korean Peninsula; established in 1948) South Korea, which is the only place that VDSL is taking the majority.
		(VDSL is not ratified for use on (Click link for more info and facts about Telstra) Telstra supplied copper lines in Australia yet, and (Click link for more info and facts about Telstra) Telstra has publically voiced to VDSL).
		VDSL is offered by (Click link for more info and facts about HGC) HGC.
	www.absoluteastronomy.com /encyclopedia/v/vd/vdsl3.htm (521 words)

	VDSL Testing
		VDSL is currently capable of delivering vast amounts of payload over the existing POTS infrastructure, such as asymmetric 70+ Mbps at short range and symmetric 10 Mbps at 5000 ft (1500 m).
		Since VDSL uses such a wide frequency spectrum, it is particularly susceptible to interference from outside sources (both the European and US standards allow 6 narrow amateur radio bands within the VDSL spectrum).
		Consequently, unlike legacy transmission schemes, VDSL is susceptible to the notch effect caused by short bridge taps.In the example loop shown,a bridge tap only 15 ft (5 m)in length represents a transmission impairment centered at about 9.5 MHz,impacting a frequency range from 7 MHz to 12 MHz, well within the VDSL spectrum.
	www.sunrisetelecom.com /mtt/VDSL.shtml (867 words)

	The VDSL at France Telecom (Site not responding. Last check: 2007-10-09)
		The VDSL authorizes the routing of the data to the under-distributors, and then to use the network of pair coppered of the traditional telephone, through DSLAM, in order to transport the data to the customer.
		The VDSL thus imposes strong constraints as for the cover, because of its limitation in distance.
		Thus, with this fibre network, the massive deployment of the VDSL would not be problematic any more, since the optical fibres do not present the problems had with the pairs of copper, namely the attenuation of the signal.
	216.239.39.104 /translate_c?hl=en&u=http://www.infos-du-net.com/news/4477-VDSL-france-telecom.html (712 words)

	ATM Passive Optical Networks and Integrated VDSL
		VDSL chipsets and modules are becoming available that allow the technology to be evaluated in the field.
		VDSL uses the frequency range from 300 kHz up to 30 MHz, and this coincides with a number of significant shortwave bands (e.g., emergency services and amateur radio).
		Because of the low processor load requirements of the particular VDSL implementation, it is possible to perform enhanced ancillary tasks such as the monitoring of performance statistics, and the insertion and extraction of ATM cells for network management purposes.
	www.comsoc.org /~ci/private/2000/mar/Cooper.html (3236 words)

	VDSL faces interference (Site not responding. Last check: 2007-10-09)
		Unfortunately, VDSL won't be available everywhere as it relies on a fibre-optic connection from the local phone exchange to a wiring cabinet on the street near the customer.
		VDSL modems only have to work on the short length of wire between the cabinet and a subscriber's house or office.
		VDSL uses signals that operate in the 1MHz to 30MHz frequency band, which are to be carried over a pair of wires that are situated overhead for part of their length and are not too well balanced.
	www.computency.co.uk /010205.htm (491 words)

	Startup Aims To Beat Giants In VDSL - Technology News by TechWeb
		VDSL Systems Inc., Denver, announced a DSL access multiplexor, an access router, and a PCI card suited for a business-class VDSL network that could deliver data rates in the range of 10 Mbit/s to 23 Mbit/s over loop lengths of about 3,000 feet.
		Meanwhile VDSL Systems is targeting two other classes of customers: long-distance companies seeking a new local-access strategy and a class of about 2,000 building LECs (BLECs) that range from hotels and real-estate companies to apartment complexes that supply telecom services to their tenants.
		VDSL's chief technology officer is monitoring standards efforts with European Telecommunication Standards Institute in Europe, which is drafting a VDSL standard and American National Standards Institute in the United States, which is about three months behind that in a similar effort.
	www.techweb.com /wire/29105287 (1251 words)

	VDSL Information
		VDSL is deployed from the cabinet or from the central office exchange, referred to as Fiber to the Cabinet (FTTCab) and Fiber to the Exchange (FTTEx) respectively.
		VDSL is essentially a fiber to the node architecture with an optical network unit sited in the access network.
		VDSL standardization is in progress in ITU (International Telecommunication Union), study group SG15/Q4, as well as in the regional bodies ANSI/T1E1.4 (American National Standards Institute) and ETSI/TM6 (European Telecommunications Standards Institute).
	www.voxtechnologies.com /vdsl_information.htm (1093 words)

	vdsl (Site not responding. Last check: 2007-10-09)
		The fully integrated VDSL solution will be available for commercial trials towards the end of the year.
		The Nokia VDSL line card implements the DMT line code and is compliant with the ITU-T 993.1 VDSL standard, supporting both 997 and 998 band plans with 3 or 4 bands.
		VDSL allows operators to support a diverse range of services including residential media services, such as video on demand, digital broadcast TV, and interactive TV, as well as improved business-oriented high-speed data services, such as high-end LAN interconnection for small to medium enterprises and small-office home-office businesses, says Mark Slater, Vice President.
	www.1st-in-dsl.com /14036-vdsl.html (503 words)

	VDSL Standards Status - Telebyte - Designers of Local Loop Simulators and Noise Generators (Site not responding. Last check: 2007-10-09)
		As of early 2002, VDSL technology (after several years of work) is very near to having all the needed building blocks in place to operate in the real world and provide service on a wide scale.
		This distance is consistent with the concept of VDSL extending on copper pairs either directly out from the telephone building to nearby customers or from an optical fiber terminal in the field, on copper, to more distant customers.
		Because VDSL system technology and the physical layer standards are well developed, VDSL is a leading candidate for EFM copper media.
	www.telebytebroadband.com /browserAds/vdsl-standards-status.html (1184 words)

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