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公开(公告)号:US06731707B1
公开(公告)日:2004-05-04
申请号:US09446120
申请日:2000-08-24
申请人: Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Öhman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Göran Ökvist , Lis-Mari Ljunggren , Hans Lundberg , Tomas Stefansson , Gunnar Bahlenberg , Sivert Håkansson , Magnus Johansson
发明人: Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Öhman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Göran Ökvist , Lis-Mari Ljunggren , Hans Lundberg , Tomas Stefansson , Gunnar Bahlenberg , Sivert Håkansson , Magnus Johansson
IPC分类号: H04L700
CPC分类号: H04N1/0035 , H04J3/0644
摘要: 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.
摘要翻译: 用于VDSL系统中的节点同步的装置,或者更确切地说,在用户和本地站之间共享接入网络中的电缆的公共部分的光VDSL节点的同步。 向外部系统(例如GPS)提供时间同步,其给出不同节点可以被同步的时间参考。 同步减少不同节点中的VDSL系统之间的近端串扰。 优选地,每个相应节点包括用于同步信号的接收器和具有高稳定性以提供稳定时钟信号的内部振荡器。
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公开(公告)号:US07023907B1
公开(公告)日:2006-04-04
申请号:US09446357
申请日:1998-06-10
申请人: Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Ohman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Goran Okvist , Lis-Mari Ljunggren , Hans Lungberg , Tomas Stefansson , Gunnar Bahlenberg , Siwert Hakansson , Magnus Johansson
发明人: Sven-Rune Olofsson , Joachim Johansson , Mikael Isaksson , Hans Ohman , Daniel Bengtsson , Lennart Olsson , Anders Isaksson , Goran Okvist , Lis-Mari Ljunggren , Hans Lungberg , Tomas Stefansson , Gunnar Bahlenberg , Siwert Hakansson , Magnus Johansson
IPC分类号: H04B1/38
CPC分类号: H04M11/062
摘要: 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.
摘要翻译: VDSL调制解调器,其分为放置在光节点中的模拟部分和放置在本地站中的数字部分。 VDSL调制解调器的模拟部分包括A / D转换器和D / A转换器,滤波器,放大器,混合/平衡 - 不平衡变换器,自适应噪声衰减器,光学接口以及可能的回波消除器。 调制解调器的数字部分包括FFT / IFFT处理器,同步器,均衡器,交错单元,纠错单元,协议管理器和光接口。 VDSL调制解调器简化了调制解调器的同步,并降低了光节点的功耗。 另外,光节点中的复用器功能更简单,因为它不需要管理协议。
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