Determining cable attenuation and loss of signal threshold
First Claim
1. A method of assessing attenuation of a pulsed signal traversing a cable, comprising the steps of:
- identifying a pulse in a signal received after traversing a cable;
determining first and second reference signal levels in dependence upon characteristics of the pulse;
measuring the slope of the pulse between the first and second reference signal levels; and
determining an indication of cable attenuation from the measured slope.
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Accused Products
Abstract
Attenuation of a pulsed signal traversing a cable is assessed by identifying a pulse in a signal received after traversing the cable and determining first and second reference signal levels in dependence upon characteristics of the pulse. A measurement is made of the slope of the pulse between the first and second reference signal levels (such as 25% and 75% of the peak pulse magnitude), and this measurement is used to determine an indication of the cable attenuation. The cable attenuation may in turn be used to determine a threshold for indicating loss of signal during a measurement operation.
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Citations
10 Claims
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1. A method of assessing attenuation of a pulsed signal traversing a cable, comprising the steps of:
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identifying a pulse in a signal received after traversing a cable;
determining first and second reference signal levels in dependence upon characteristics of the pulse;
measuring the slope of the pulse between the first and second reference signal levels; and
determining an indication of cable attenuation from the measured slope. - View Dependent Claims (2, 3, 4, 5)
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6. Apparatus for assessing attenuation of a pulsed signal traversing a cable, comprising:
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means for identifying a pulse in a signal received after traversing a cable;
means for determining first and second reference signal levels in dependence upon characteristics of the pulse;
means for measuring the slope of the pulse between the first and second reference signal levels; and
means for determining an indication of cable attenuation from the measured slope. - View Dependent Claims (7, 8, 9, 10)
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Specification