公开(公告)号：EP1060612B1

公开(公告)日：2002-11-20

申请号：EP99905407.5

申请日：1999-01-28

Applicant: STMicroelectronics N.V.

Inventor： OLOFSSON, Sven-Rune ,  OLSSON, Lennart ,  JOHANSSON, Joachim ,  ÖHMAN, Hans ,  ISAKSSON, Mikael ,  JOHANSSON, Magnus ,  STEFANSSON, Tomas ,  BAHLENBERG, Gunnar ,  ISAKSSON, Anders ,  ÖKVIST, Göran ,  LJUNGGREN, Lis-Marie ,  BENGTSSON, Daniel

IPC: H04M11/00

CPC classification number: H04M11/062

Abstract: When delivering a broadband service, such as xDSL, without inband POTS, it is necessary to separate the analogue POTS signal and the xDSL signal from each other at both the CO (Central Office) and the CP (Customer's Premises). This can be achieved by using an active POTS splitter. The present invention incorporates test functionality for the line between the CP and the CO, or ONU (Optical Network Unit), in the POTS splitter. This enables two-sided measurements on the line, both during installation and during operation. The measurements are performed at the CO and upon request, or when the test device automatically sends a test message/signal. In this way there is no need for field technicians at the CP side. The POTS splitter can have a unique identity code that is transmitted to the CO each time a test is started, or on receipt of a request from the CO.

公开(公告)号：EP0990341B1

公开(公告)日：2003-05-28

申请号：EP98928780.0

申请日：1998-06-10

Applicant: STMicroelectronics N.V.

Inventor： OLOFSSON, Sven-Rune ,  JOHANSSON, Joachim ,  ISAKSSON, Mikael ,  ÖHMAN, Hans ,  BENGTSSON, Daniel ,  OLSSON, Lennart ,  ISAKSSON, Anders ,  ÖKVIST, Göran ,  LJUNGGREN, Lis-Mari ,  LUNGBERG, Hans ,  STEFANSSON, Tomas ,  BAHLENBERG, Gunnar ,  HAKANSSON, Siwert ,  JOHANSSON, Magnus

IPC: H04M11/06

CPC classification number: H04M11/062

Abstract: The invention relates to a new type of VDSL-modems where the VDSL-modem is divided into on one hand an analog part which is placed in the optical node, and on the other a digital part which is placed in the local station. The analog part of the VDSL-modem consists of A/D-converter and D/A-converter, filter, amplifier, hybrid/balun, adaptive noise attenuator, optical interface and possibly echo canceller. The digital part of the modem consists of an FFT/IFFT-processor, a synchronizer, an equalizer, an interleaving unit, an error correction unit, a protocol manager, and an optical interface. The invention simplifies i.a. synchronization of the modems and reduces the power consumption in the optical node. The multiplexor function in the optical node in addition will be simpler because it need not manage a protocol.

公开(公告)号：EP1031199B1

公开(公告)日：2003-02-26

申请号：EP98956052.9

申请日：1998-11-11

Applicant: STMicroelectronics N.V.

Inventor： ISAKSSON, Mikael ,  JOHANSSON, Magnus ,  OLSSON, Lennart ,  STEFANSSON, Tomas ,  ÖHMAN, Hans ,  BAHLENBERG, Gunnar ,  ISAKSSON, Anders ,  ÖKVIST, Göran ,  LJUNGGREN, Lis-Marie ,  BENGTSSON, Daniel ,  OLOFSSON, Sven-Rune ,  JOHANSSON, Joachim ,  BÖRJESSON, Per, Ola ,  GRIP, Niklas ,  NILSSON, Richard ,  SJÖBERG, Frank ,  WILSON, Sarah ,  ÖDLING, Per

IPC: H04B15/00 ,  H04B3/32

CPC classification number: H04L25/10 ,  H04B1/123 ,  H04L27/2647

公开(公告)号：EP0992138B1

公开(公告)日：2002-08-28

申请号：EP98929976.3

申请日：1998-06-10

Applicant: STMicroelectronics N.V.

Inventor： OLOFSSON, Sven-Rune ,  JOHANSSON, Joachim ,  ISAKSSON, Mikael ,  ÖHMAN, Hans ,  BENGTSSON, Daniel ,  OLSSON, Lennart ,  ISAKSSON, Anders ,  ÖKVIST, Göran ,  LJUNGGREN, Lis-Mari ,  LUNDBERG, Hans ,  STEFANSSON, Tomas ,  BAHLENBERG, Gunnar ,  HAKANSSON, Sivert ,  JOHANSSON, Magnus

IPC: H04L7/08

CPC classification number: H04N1/0035 ,  H04J3/0644

Abstract: The invention relates to an arrangement for synchronization of nodes in VDSL-systems, or more exactly, synchronization of optical VDSL-nodes (2) which share a common part of a cable in the access network between the subscribers (3) and the local station (1). The invention provides a time synchronization towards an external system (7), 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 respective node includes a receiver (6) for a synchronization signal and an internal oscillator with high stability to deliver a stable clock signal.