Method and apparatus for determining a loss of signal condition
First Claim
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1. A method comprising:
- comparing signal strength of a plurality of data bits of an input data stream to a signal strength threshold level and generating an indication thereof;
determining a count value according to the indication; and
generating a loss-of-signal indication according to the count value,wherein the count value is a number of data bits having a signal strength above the signal strength threshold level.
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Abstract
A loss-of-signal (LOS) condition is detected by sampling input data for a predetermined time period, comparing a magnitude of the sampled input data to a threshold signal strength level, and asserting a LOS indication if the number of samples that have signal strength less than the threshold signal strength level is less than a predetermined value.
25 Citations
43 Claims
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1. A method comprising:
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comparing signal strength of a plurality of data bits of an input data stream to a signal strength threshold level and generating an indication thereof; determining a count value according to the indication; and generating a loss-of-signal indication according to the count value, wherein the count value is a number of data bits having a signal strength above the signal strength threshold level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method comprising:
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comparing signal strength of a plurality of data bits of an input data stream to a signal strength threshold level and generating an indication thereof; determining a count value according to the indication; and generating a loss-of-signal indication according to the count value, wherein generating the loss-of-signal indication comprises comparing the count value to a threshold count, wherein the threshold count varies according to an indication of the signal strength threshold level. - View Dependent Claims (27)
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28. A method for determining existence of a loss-of-signal condition, the method comprising:
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determining for a plurality of data bits of an input data stream whether a signal strength of each of the data bits is above or below a signal threshold level; and determining that the loss-of-signal condition exists if a predetermined number of the data bits have a signal strength below the signal threshold level.
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29. A method comprising:
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sampling input data; comparing a magnitude of the sampled input data to a threshold signal strength level; and asserting a loss-of-signal indication if a number of samples, over a predetermined time period, having a signal strength less than the threshold signal strength level, is more than a predetermined value.
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30. An integrated circuit comprising:
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a sample circuit coupled to sample input data and store a first value when signal strength magnitude of the sampled input data is above a signal strength threshold level and store a second value when the signal strength magnitude of the sampled input data is below the signal strength threshold level; and a counter circuit coupled to generate a count value according to an output of the sample circuit; wherein the count value is a number of input data samples having a signal strength magnitude above the signal strength threshold level. - View Dependent Claims (31, 32, 33, 34, 35, 36, 40, 41)
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37. The integrated circuit as recited in 30 further comprising:
a decimator circuit coupled to the sample circuit, an output of the decimator circuit coupled as a count control signal for the counter circuit. - View Dependent Claims (38, 39)
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42. An apparatus detecting a loss-of-signal (LOS) condition comprising:
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means for determining for a plurality of data bits of an input data stream whether a signal strength magnitude of each of the data bits is above or below a signal threshold level; and means for determining that the loss-of-signal condition exists if a predetermined number of the data bits have a signal strength magnitude below the signal threshold level.
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43. An apparatus comprising:
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means for sampling an input data stream; means for comparing signal strength magnitude of the sampled input data stream to a threshold signal strength level; and means for asserting a loss-of-signal indication if a number of samples having signal strength less than the threshold signal strength level is less than a predetermined value.
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Specification