US 7,023,907 B1 · VDSL modem divided into a digital and an analog part

VDSL modem divided into a digital and an analog part

AssigneeSTMicroelectronics S.r.l.

InventorsSven-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

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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.

Claims11

Dependent claims

A VDSL-modem comprising:

an optical node for connection to at least one subscriber, and including an analog unit comprising an analog-to-digital (A/D) converter for converting analog signals received from the at least one subscriber to digital signals for transmission;
at least one local station, at a separate location from the optical node, and including a digital unit in communication with the analog unit for receiving the digital signals therefrom;
and
an optical fiber connecting the analog unit and the digital unit.

1 more element

Dependencies are inferred from the claim text.