VDSL modem divided into a digital and an analog part

US7023907B1 · kind B1 · utility

Assignee

• STMICROELECTRONICS N.V. · NL

Inventors

• Sven-Rune Olofsson · Älvsbyn, SE
• Joachim Johansson · Älvsbyn, SE
• Mikael Isaksson · Luleå, SE
• Hans Ohman · Luleå, SE
• Daniel Bengtsson · Luleå, SE
• Lennart Olsson · Luleå, SE
• Anders Isaksson · Luleå, SE
• Goran Okvist · Luleå, SE
• Lis-Mari Ljunggren · Älvsbyn, SE
• Hans Lungberg · Luleå, SE
• Tomas Stefansson · Luleå, SE
• Gunnar Bahlenberg · Luleå, SE
• Siwert Hakansson · Luleå, SE
• Magnus Johansson · Luleå, SE

Key dates

• Filing date: Jun 10, 1998
• Grant date: Apr 4, 2006
• Expiry date: Jun 10, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04M11/062
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A VDSL-modem which is divided into an analog part which is placed in an optical node and a digital part which is placed in a local station. The analog part of the VDSL-modem includes an A/D-converter and D/A-converter, a filter, an amplifier, a hybrid/balun, an adaptive noise attenuator, an optical interface, and possibly an echo canceller. The digital part of the modem includes an FFT/IFFT-processor, a synchronizer, an equalizer, an interleaving unit, an error correction unit, a protocol manager, and an optical interface. The VDSL-modem simplifies synchronization of the modem and reduces power consumption in the optical node. A multiplexor function in the optical node in addition is simpler because it need not manage a protocol.