公开(公告)号：DE69807486D1

公开(公告)日：2002-10-02

申请号：DE69807486

申请日：1998-06-10

Applicant: ST MICROELECTRONICS NV

Inventor： OLOFSSON SVEN-RUNE ,  JOHANSSON JOACHIM ,  ISAKSSON MIKAEL ,  OEHMAN HANS ,  BENGTSSON DANIEL ,  OLSSON LENNART ,  ISAKSSON ANDERS ,  OEKVIST GOERAN ,  LJUNGGREN LIS-MARI ,  LUNDBERG HANS ,  STEFANSSON TOMAS ,  BAHLENBERG GUNNAR ,  HAKANSSON SIVERT ,  JOHANSSON MAGNUS

IPC: H04B10/00 ,  H04J3/06 ,  H04L7/00 ,  H04N1/00 ,  H04L7/08

Abstract: An arrangement for synchronization of nodes in VDSL-systems, or more exactly, synchronization of optical VDSL-nodes which share a common part of a cable in the access network between subscribers and a local station. A time synchronization is provided towards an external system, for instance GPS, which gives a time reference by which the different nodes can be synchronized. The synchronization reduces the near end cross-talk between the VDSL-systems in the different nodes. Preferably, each respective node includes a receiver for a synchronization signal and an internal oscillator with high stability to deliver a stable clock signal.

公开(公告)号：DE69815104T2

公开(公告)日：2004-03-18

申请号：DE69815104

申请日：1998-06-10

Applicant: ST MICROELECTRONICS NV

Inventor： OLOFSSON SVEN-RUNE ,  JOHANSSON JOACHIM ,  ISAKSSON MIKAEL ,  OEHMAN HANS ,  BENGTSSON DANIEL ,  OLSSON LENNART ,  ISAKSSON ANDERS ,  OEKVIST GOERAN ,  LJUNGGREN LIS-MARI ,  LUNGBERG HANS ,  STEFANSSON TOMAS ,  BAHLENBERG GUNNAR ,  HAKANSSON SIWERT ,  JOHANSSON MAGNUS

IPC: H04J11/00 ,  H04L1/00 ,  H04L29/10 ,  H04M11/00 ,  H04M11/06

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.