Method and apparatus for determining properties of a transmission channel
First Claim
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1. A time domain reflectometry method for determining properties of a transmission channel, comprising:
- generating, at one end of the channel, a plurality of pulses covering different frequency bands through time domain reflectometry, and processing, as received signals, the echoes provided by the plurality of pulses at said one end of the channel;
wherein the generating is performed so that the frequency bands of adjacent ones of the plurality of pulses overlap.
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Abstract
The invention concerns a time domain reflectometry method for estimating properties of a transmission channel, for instance a channel for transmitting electric or acoustic signals. This method includes the steps of generating, at one end of the channel, a plurality of pulses (40, 42, 44) covering differency frequency bands, and processing the echoes provided by these pulses at the same end of the channel. The frequency bands of the generated pulses are preferably overlapping. The invention is particularly applicable to the testing of ADSL services.
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Citations
26 Claims
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1. A time domain reflectometry method for determining properties of a transmission channel, comprising:
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generating, at one end of the channel, a plurality of pulses covering different frequency bands through time domain reflectometry, and processing, as received signals, the echoes provided by the plurality of pulses at said one end of the channel;
wherein the generating is performed so that the frequency bands of adjacent ones of the plurality of pulses overlap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for testing the properties of transmission channels between a central office and a subscriber, comprising a time domain reflectometry test circuit, wherein said time reflectometry test circuit comprises:
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a pulse generator generating a plurality of pulses, at one end of the line, covering different frequency bands through time domain reflectometry, and an echo processor processing the echoes provided by these pulses at the same end of the channel;
wherein the different frequency bands of adjacent ones of the pulses are overlapping. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification