Loop diagnostics for ADSL systems
First Claim
Patent Images
1. A method of performing loop diagnostics in a DSL system, the method comprising:
- entering a loop diagnostic mode;
measuring incoming noise during a quiet mode where no signals are transmitted or received;
receiving a probe signal having known transmit characteristics;
measuring characteristics of the received probe signal; and
determining loop diagnostic information based on received probe signal characteristics and known transmit characteristics.
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Abstract
The present invention provides techniques for performing loop diagnostics in DSL communication systems.
49 Citations
26 Claims
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1. A method of performing loop diagnostics in a DSL system, the method comprising:
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entering a loop diagnostic mode;
measuring incoming noise during a quiet mode where no signals are transmitted or received;
receiving a probe signal having known transmit characteristics;
measuring characteristics of the received probe signal; and
determining loop diagnostic information based on received probe signal characteristics and known transmit characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25)
exchanging transmit characteristics of the probe signal between remote and local modems thereby establishing the known transmit characteristics.
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3. The method of claim 2, wherein the exchanging is carried out by an initial G.hs handshaking session.
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4. The method of claim 1, further comprising:
exchanging the loop diagnostic information between local and remote modems.
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5. The method of claim 4, wherein the exchanging is carried out by a G.hs handshaking session.
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6. The method of claim 1, further comprising:
transmitting a second probe signal having known transmit characteristics to a remote modem.
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7. The method of claim 6, wherein the second probe signal is one of R-PROBE-LD or C-PROBE-LD, and uses a data pattern having a pseudo-random sequence.
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8. The method of claim 6, wherein the second probe signal is a collection of one or more data patterns.
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9. The method of claim 1, wherein the probe signal is one of R-PROBE-LD or C-PROBE-LD, and uses a data pattern having a pseudo-random sequence.
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10. The method of claim 1, wherein the probe signal is a collection of one or more data patterns.
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11. The method of claim 1, wherein the diagnostic information includes at least one of attenuation, SNR, noise PSD, or received probe signal PSD associated with one or more subchannels.
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12. The method of claim 1, wherein the loop diagnostic mode is entered in response to at least one of a repeated link initialization failure or a troubleshooting call.
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13. The method of claim 1, wherein the known transmit characteristics include transmit power per subchannel, and the received probe signal characteristics include received power per subchannel.
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14. The method of claim 1, further comprising:
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transmitting a second probe signal having known transmit characteristics to a remote node; and
at the remote node;
receiving the second probe signal for determining loop diagnostic information based on received second probe signal characteristics and known transmit characteristics, and measuring incoming noise PSD during another quiet mode where no signals are transmitted or received.
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15. The method of claim 1, further comprising:
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transmitting a second probe signal having known transmit characteristics to a remote node; and
at the remote node;
receiving the second probe signal for determining loop diagnostic information based on received second probe signal characteristics and known transmit characteristics, and measuring incoming noise PSD during the quiet mode.
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17. The modem of claim 15, further comprising:
a probe signal generation module in communication with the analysis module, the probe signal generation module adapted to transmit a second probe signal having known transmit characteristics to a remote modem, and to enter a quiet mode where no signals are transmitted or received thereby allowing the remote modem to measure its incoming noise PSD.
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18. The modem of claim 17, wherein the second probe signal is one of R-PROBE-LD or C-PROBE-LD, and uses a data pattern having a pseudo-random sequence.
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19. The modem of claim 17, wherein the second probe signal is a collection of one or more data patterns.
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20. The modem of claim 15, wherein the known transmit characteristics are one of predefined or established during an initial diagnostic mode handshaking session.
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21. The modem of claim 15, wherein the loop diagnostic information is provided to a remote modem during a diagnostic mode handshaking session, and includes at least one of attenuation, SNR, noise PSD, or received probe signal PSD associated with one or more subchannels.
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22. The modem of claim 15, wherein the probe signal is one of R-PROBE-LD or C-PROBE-LD, and uses a data pattern having a pseudo-random sequence.
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23. The modem of claim 15, wherein the probe signal is a collection of one or more data patterns.
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24. The modem of claim 15, wherein the modem enters loop diagnostic mode in response to at least one of a repeated link initialization failure, a troubleshooting call, or a message in a handshaking session.
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25. The modem of claim 15, wherein the known transmit characteristics include transmit power per subchannel, and the received probe signal characteristics include received power per subchannel.
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16. A modem for performing loop diagnostics in a DSL system, the modem comprising:
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a probe signal reception module adapted to receive a probe signal having known transmit characteristics, and to measure received characteristics of the probe signal, the probe signal reception module further adapted to measure incoming noise during a quiet mode where no signals are transmitted or received; and
an analysis module in communication with the probe signal reception module, the analysis module adapted to determine loop diagnostic information based on received probe signal characteristics and known transmit characteristics.
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26. A method of performing loop diagnostics in an ADSL system, the method comprising:
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entering a loop diagnostic mode in response to at least one of a repeated link initialization failure or a troubleshooting call;
receiving a probe signal having known transmit characteristics including transmit power per subchannel;
measuring received characteristics of the probe signal including received signal power per subchannel;
measuring incoming noise PSD during a quiet mode where no signals are transmitted or received; and
determining loop diagnostic information based on received probe signal characteristics and known transmit characteristics.
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Specification