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VDSL-2 chipsets bow for central office, CPE

Posted: 17 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:central office? vdsl? modulation? multitone? ip?

Ikanos Communications Inc. has introduced VDSL-2 chipsets for central-office and customer-premises modems.

The SmartLeap 9400 three-piece chipset for the central office, as well as the two-piece CleverConnect 600 set for customer-premises equipment (CPE), can meet 100Mbps standards for fiber-to-the-home extender networks, as well as the 50Mbps VDSL-2 standards, Ikanos said.

VDSL-2 is moving toward standardization within the International Telecommunication Union, which is using a unified modulation standard based on discrete-multitone technology. The VDSL-2 standard consumes as much as 30MHz of bandwidth, against 12MHz for VDSL.

Eliminating quadrature-amplitude modulation as an alternative line code has prompted many semiconductor companies effectively to drop out of the VDSL-2 market, said Richard Sekar, Ikanos' VP of marketing. Currently, Ikanos sees STMicroelectronics, Infineon Technologies, Broadcom, Texas Instruments and Conexant Systems as competitors, Sekar said, adding that he does not expect all of them to come to market with VDSL-2 solutions.

Ikanos' SmartLeap family for the central office has an eight-port burst-mode engine that combines a 150MIPS processor, a DSP engine for line modulation, as well as atm and Internet Protocol (IP) interfaces. The other two chips are a four-port AFE with ADCs and dacs, and a single-port integrated front-end (IFE) with line drivers, capacitors and a handful of other discretes.

SmartLeap offers more than 40 programmable-band plans, which represent ITU-compliant ways of managing bandwidth. It supports two-pair bonding at the system level and trellis encoding, as well as multiple framing protocols.

On the user side, the two-piece CleverConnect chipset combines a DSP and AFE in one device so that only a burst-mode engine and single-port IFE are required on the subscriber side. When CleverConnect 600 is used with SmartLeap at the central office, interfaces can be allocated as IP or ATM on a per-port basis. The user equipment can be programmed as VDSL, VDSL Long Range or VDSL-2, all in either IP or ATM mode.

- Loring Wirbel

EE Times

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