Silicon Investor (SI) -- The First Internet Community

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Technology Stocks : LAST MILE TECHNOLOGIES - Let's Discuss Them Here -- Ignore unavailable to you. Want to Upgrade?

To: Frank A. Coluccio who wrote (8727)	10/2/2000 4:55:52 PM
From: MikeM54321	Respond to of 12823

Re: HDSL2 versus G.SHDSL-- Is HDSL2 DOA? Frank, elmatador, justone and thread- Can anyone shed light on the following story about HDSL-2 versus G.SHDSL? Just what we need, ANOTHER flavor of DSL to confuse things. This sounds pretty dramatic in terms of how it may effect HDSL-2. Thanks. -MikeM(From Florida) ************************* Focus on multiple-rate, international version sidelines North American standard** Stampede to G.SHDSL leaves HDSL-2 at gate Sep. 29, 2000 (Electronic Engineering Times - CMP via COMTEX) -- BOSTON - The North American upgrade to the high-bit-rate digital subscriber line standard, HDSL-2, has been all but flattened by a steamroller movement to turn to G.SHDSL, a multiple-rate version touted by the International Telecommunications Union. At Fall DSLcon here, the impact of a six-month-old G.SHDSL promotional group formed by Adtran Inc., Cisco Systems Inc., Globespan Inc. and Infineon Technologies Inc. was evident everywhere. Metalink Ltd., Globespan and Infineon all plan on near-term semiconductor support. Even the two companies most associated with HDSL-2, Intel Corp. and Conexant Systems Inc., concede that interest in a chip set that supports only a T1 (1.5-Mbit/second) rate is limited to transport-only functions for implementing T1 service, a factor that could affect the way future two-mode products are marketed. G.SHDSL is a standards-based version of symmetrical rate adaptive DSL that can accommodate line rates of about 384 kbits/s to 2.3 Mbit/s off a single line card. Previous symmetrical schemes have necessitated multiple line cards to accommodate varying geographies and rates and have relied on proprietary coding schemes such as 2B1Q. HDSL-2, meanwhile, was developed as a short-term solution to provide T1-only speeds over a single copper pair (as opposed to the dual copper pairs required by the original HDSL). But equipment vendors clamored for unified chip sets that could handle lower symmetrical rates up to the European E1 rate (2.048 Mbits/s), thus letting developers design one line card for symmetrical services worldwide. Danny Gur, vice president of business development at Tel Aviv-based Metalink, said HDSL-2 "has only a small, hidden role to play in T1 infrastructure." Symmetrical chips supporting proprietary 2B1Q encoding, such as Conexant's ZipWire, will have a continued lifetime, Gur predicted, "but the future belongs to G.SHDSL." Metalink plans to be the first semiconductor company to sample a multichannel chip that puts G.SHDSL support directly into the telco central office. Infineon already offers G.SHDSL support in a single-channel version for customer-premises routers and integrated access devices. Ben Runyan, product marketing manager at Infineon, told a DSLcon panel that G.SHDSL used in a cabling binder group with other telephony services will have much less impact than 2B1Q, he said. Legacy service That claim sparked protest from several developers at Conexant Systems Inc., who said that 2B1Q still could offer long-reach services with acceptable noise margins. But Ron Cates, vice president of broadband access service at Conexant, emphasized that the company is pushing G.SHDSL in new designs. The ZipWire 2B1Q chips will be used in legacy SDSL designs, he said. The ITU has granted G.SH-DSL a new standard number, G.991.2, which was moved in-to a determination phase in April and is expected to be approved in February 2001. Meanwhile, an official G.SH-DSL Consortium for interoperability testing was formed at the University of New Hampshire on Aug. 23. The four-company group of Adtran, Cisco, Globespan and Infineon has asked the forum to formally adopt the marketing and promotional work for G.SHDSL. Cates said that new work in the ITU for adding analog POTS phone service to a G.SHDSL frequency band could lead to a day when asymmetric DSL, in both its full-rate and splitterless versions, becomes obsolete. But Ahmed of Intel said that in the meantime, 2B1Q will be popular in the short term, while the current version of G.SHDSL will remain popular alongside ADSL for several years to come. siliconinvestor.com