VDSL modem divided into a digital and an analog part
View Patent ↗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.
1. 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.
2. A VDSL-modem according to claim 1 , wherein the digital unit includes a protocol manager.
3. A VDSL-modem according to claim 1 , wherein the analog unit further includes a D/A converter, a filter, an amplifier, a hybrid/balun, an adaptive noise attenuator, and an optical interface.
4. A VDSL-modem according to claim 3 , wherein the analog unit further comprises an echo canceller.
5. A VDSL-modem according to claim 1 , wherein the digital unit comprises an FFT/IFFT-processor, a synchronizer, an equalizer, an interleaving device, an error correction unit, a protocol manager and an optical interface.
6. A DSL-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; and
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.
7. A VDSL-modem according to claim 6 , wherein the digital unit includes a protocol manager.
8. A VDSL-modem according to claim 6 , wherein the analog unit further includes a D/A converter, a filter, an amplifier, a hybrid/balun, an adaptive noise attenuator, and an optical interface.
9. A VDSL-modem according to claim 8 , wherein the analog unit further comprises an echo canceller.
10. A VDSL-modem according to claim 6 , wherein the digital unit comprises an FFT/IFFT-processor, a synchronizer, an equalizer, an interleaving device, an error correction unit, a protocol manager and an optical interface.
11. A method of providing a Very High Data Rate Digital Subscriber Line (VDSL) to a subscriber comprising:
connecting an optical node to the subscriber, the optical node including an analog unit comprising an analog-to-digital (A/D) converter for converting analog signals received from the subscriber to digital signals for transmission;
providing a digital unit in at least one local station at a separate location from the optical node, the digital unit in communication with the analog unit for receiving the digital signals therefrom; and
connecting the analog unit and the digital unit with an optical fiber.