High-speed digital subscriber lines
AssigneeGPT Limited
InventorsDavid Christopher Chalmers, Frederick Michael Clayton
Life of this patent
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Abstract
A communications system employs a high-speed digital link with discrete multiple tone (DMT) the outward paths from a central transmitter/receiver to further transmitter/receivers receiving signals therefrom using one set of carrier frequency channels and the return signal paths using a different set of carrier frequency channels. In one form the central transmitter/receiver is an exchange and the further transmitter/receivers are subscribers connected to the exchange.
Claims14
A communications system employing a high-speed digital link with discrete multiple tone (DMT) modulation, comprising:
- a plurality of outward paths from a central transmitter/receiver to further transmitter/receivers receiving signals therefrom, each of the outward paths using one set of carrier frequency channels;
- a plurality of return signal paths from the further transmitter/receivers to the central transmitter/receiver, each of the return paths using a different set of carrier frequency channels;
- and
- said carrier frequency channels being arranged in a sequence in the frequency domain, and alternate channels in said sequence being allocated to the outward and return paths respectively.
The communications system as claimed in claim 10, wherein the central transmitter/receiver forms part of an exchange, and wherein the further transmitter/receivers form part of subscriber equipment connected to the exchange.
A communications system employing a high-speed digital link with discrete multiple tone (DMT) modulation, comprising:
- a plurality of outward paths carrying transmitted data from a central transmitter/receiver to further transmitter/receivers, each of the outward paths using one set of carrier frequency channels;
- a plurality of return signal paths from the further transmitter/receivers to the central transmitter/receiver carrying data from the further transmitter/receivers to be received by the central transmitter/receiver, each of the return paths using a different set of carrier frequency channels;
- and
- said transmitted and received data being in an alignment, and said alignment being based on commands sent by the central transmitter/receiver to the further transmitter/receivers.
Dependencies are inferred from the claim text.