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Technology Stocks : Westell WSTL -- Ignore unavailable to you. Want to Upgrade?

To: hal jordan who wrote (15488)	3/22/1999 12:20:00 AM
From: P314159d	Respond to of 21342

Maybe you all will get excited by some big "contract" announcement, but I gotta figure a company doesn't lay off after it has bled soooooo long, to "MAKE IT BIG"! make it small.

To: hal jordan who wrote (15488)	3/22/1999 10:44:00 AM
From: Chemsync	Read Replies (1) \| Respond to of 21342

VDSL cheaper than ADSL? Once standards are set...... Siemens samples VDSL chip set By Loring Wirbel EE Times (03/22/99, 10:15 a.m. EDT) CUPERTINO, Calif. — Siemens Microelectronics Inc. has added a very-high-bit-rate digital subscriber line chip set to its POTSWire family of xDSL transceivers. The PEB2281X chips, one of the first merchant VDSL sets to hit the market, will be able to support symmetrical data rates of up to 13 Mbits/second at loop lengths of 1,500 meters, yet Siemens is aiming to price the three-piece set at rough parity with ADSL devices. Uwe Hering, solutions center marketing manager for communications ICs at Siemens Microelectronics, said the set's PEB22812 baseband digital data pump devices did not use the Carmel DSP core as did several earlier POTSWire family members, but rather required a hard-coded device to support the high rates of Quadrature Amplitude Modulation used in VDSL. Siemens was an early supporter of the Broadcom coalition favoring QAM codes for VDSL, which has gained a significant edge over vendors who wanted a derivative of discrete multitone modulation. The chip set incoprorates a digitally controlled crystal oscillator that makes it easier for the set to support a variety of data rates. The chip set requires an external hybrid channel-separation device as well as a POTS splitter, but Hering said the high operating frequencies allow very small external hybrids, making the client systems easier to implement in some senses than ADSL in either splittered or splitterless versions. Hering said that a key goal in development of the set was to reduce power dissipation of the PEB22811 analog front-end and PEB22810 line driver, so that total consumption would be under 2.5 watts. This is important not only for desktop and set-top client devices that use VDSL, but also helps reduce power constraints for the optical network units and neighborhood gateway nodes that will be used in VDSL. Because the high-speed standard is carried over shorter copper loops, it is used in conjunction with neighborhood distribution of fiber, usually in a switched digital video style architecture. Hering said that new alternative carriers arising in both North America and Europe are building out fiber infrastructure that extends to neighborhoods, thus giving VDSL a chance at being a near-term technology, once ANSI and ETSI standardize the technology. In such instances, Hering said, VDSL can be cheaper to deploy than ADSL. Siemens partnered with Savan Communications Ltd. (Tel Aviv, Israel) to gain expertise in QAM line coding, and established a relationship similar to those between Analog Devices Inc. and Aware Inc., or Texas Instruments Inc. and Amati Communications Inc. (Amati was later acquired by TI). Siemens has licensed the line-code firmware from Savan for worldwide distribution.