| No. 0, July 2003 - Art. 3 |
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| The Zipper-DMT VDSL System: state of the art of the Zipper-VDSL Technology, ST Product Chipset, Integration Strategy and Architecture Evolution |
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by
Christophe Del Toso, Michel Combe (STMicroelectronics)
Copyright
© STMicroelectronics, 2001 |
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Abstract
Digital Subscriber Line - DSL – technologies - are effective means to provide high data rates over the embedded twisted pairs of the wired Public Switched Telephone Network (PSTN).
Among the different DSL technologies known today, VDSL (Very High speed Digital Subscriber Line) is certainly the most promising for the coming years.
Indeed, VDSL technology can deliver bit rates from 3 Mbps for medium range loops (less than 1.5 km) up to 50 Mbps for short loops (300 m), enabling to offer users with both symmetric and asymmetric services.
This paper presents an implementation of a VDSL modem chipset based on the FDD-DMT standard, also called “Zipper-DMT VDSL”. This technique consists of a multi-carrier modulation called Discrete Multi-Tone (DMT), with 4096 sub-carriers that may be allocated dynamically for up and down stream transmissions.
The paper first introduces the state of the art of the Zipper-VDSL technology. Namely, it recalls the current status of the VDSL standardization and presents the VDSL products and prototypes available today. Secondly, it presents the integrated product chipset developed by STMicroelectronics. Finally, it concludes with a prospective view of future architectures and integrations. |
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