EE Times reports the very high bit rate VDSL2 standard was ratified Friday (May 27) by the International Telecommunications Union.
Infineon has a complete VDSL2/ADSL2+ chipset for end-to-end solutions that meets the specification. The new Infineon chipset drives symmetric 100Mbit/s over copper wires at distances greater than 350 meters (1150 ft), doubling the loop reach performance of existing VDSL solutions.
The new VDSL2 standard delivers up to 100 Mbps both up and downstream, a ten-fold increase over “plain vanilla” ADSL and works over copper pairs up to 12,000 feet. It’s a less expensive alternatives to running fiber straight to the home. SBC plans to use VDSL-2, for example.
Very High Speed DSL (VDSL), though once thought of as a good solution for bringing more bandwidth to the home has lagged because of its lack of reach. It has become popular in the overseas markets because densely populated countries like China and Korea have central offices that are much closer to consumer premises.
VDSL2 uses about 30 MHz of spectrum (versus 12 MHz in VDSL) allowing more data to be sent at higher speeds and over longer distances. BellSouth and SBC have plans to use super-fast DSL to connect their fiber nodes to consumer homes. Qwest for instance has about 40,000 customers who are using VDSL technologies. It uses Discrete MultiTone.
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Verizon s FiOS (Fiber Internet Service) does not use DSL. It brings fiber directly to the home. For in-home distribution it uses twisted pair (for voice) and coax (for video). FiOS TV uses digital cable boxes rather than IP-TV. Fios Internet Service requires CAT5 or higher grade wiring. It will deliver 5 Mbps ($39/mo) to 30 Mbps ($199/mo). |
Discrete MultiTone divides the available carrier band into 247 distinct 4-KHz channels. Each channel is monitored and, if the quality is too impaired, the signal is shifted to another channel. This system constantly shifts signals, searching for the best channels for transmission and reception.
Since ADSL, ADSL2+, VDSL, and VDSL2 technologies use DMT line coding, carriers can easily migrate customers to VDSL and VDSL2. More than four million VDSL-DMT ports have been shipped to carriers in Asia and Europe. Because VDSL2 is interoperable, they don’t require a forklift replacement of existing equipment.
Om Malik compares more recent flavors of DSL
- ADSL has speeds up to 8 Mbps downstream and 1 Mbps upstream. Can be deployed from Central office and has a range of 15,000 feet and longer.
- ADSL2+ has a maximum speed of 25 Mbps downstream and 1 Mbps upstream. Can be deployed from Central office and has a range of 15,000 feet and longer
- VDSL, some chipsets that use the optional spectrum of 30 MHz can do 100 Mbps downstream and 50 Mbps upstream. Current carriers include NTT, KDDI, Korea Telecom, and Softbank BB of Japan. Has a range of about 5,000 feet
- VDSL2 has speeds of 100 Mbps downstream and 100 Mbps upstream. Has a range of about 12,000 feet.
VDSL2 is expected to be a fiercely contested market place, with early leader Ikanos like to fend off challengers like Infineon, which is expected to announce new VDSL2 chipsets at SuperComm trade show next week. Other players competing for the VDSL2 could include Broadcom, TI, and existing VDSL chip maker, Metalink. Santa Clara-based Electriphy is another recent entrant in the VDSL space.
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