Infineon Technologies and Metalink unveiled a new VDSLPlus technology capable of data rates up to 150 Mbps (short range) and extended reach exceeding 4 km using QAM line coding. VDSLPlus uses a new, fifth frequency "band" above the current 12 MHz limit, as defined by international VDSL standards. The companies said the benefits of the extended QAM VDSL technology include:
- delivery of over 150 Mbps aggregated bandwidth over single-pair copper wire - at more than 300m (1000 feet).
reach of over 4km (13,200 feet) at speeds exceeding 4 Mbps.
compliance with all relevant VDSL standards' requirements including: Band Plan 998, 997, and those defined by the Chinese CTSI as well as any proprietary band plans.
spectral compatibility and co-existence with narrowband and legacy DSL services including POTS, EURISDN, TCM-ISDN and ADSL.
support for both Ethernet and ATM over VDSL.
Metalink and Infineon said they are committed to teaming with other QAM PHY and system companies to promote VDSLPlus standardization in the various standardization bodies.
http://www.infineon.com
http://www.metalinkDSL.com
- Last week, eleven DSL semiconductor and system vendors announced their commitment to discrete multi-tone (DMT) modulation as the line code for standard-compliant very-high-bit-rate digital subscriber lines (VDSL). The companies noted that over 36 million ADSL lines deployed worldwide at the end of 2002 were using DMT modulation. The companies claim the technology will scale to more than 70 Mbps downstream and over 50 Mbps upstream on existing telephone lines. The backers of DMT VDSL include Alcatel, Analog Devices, Broadcom, Ericsson, Ikanos Communications, Intel, LSI Logic, Nokia, STMicroelectronics, Texas Instruments and Thomson Multimedia.
The T1E1.4 committee is meeting later this month to consider whether DMT or QAM should be adopted as a standard. A "VDSL Olympics" is currently underway, with both sides presenting their technical arguments as to which is best.
