Granted Patent B2

US 8,111,985 · App. 12/434,051 · Granted Feb 7, 2012

Abstract

Claims (36)

1. An apparatus for performing an optical line analysis of continuous data signals, comprising:

a phase position processor for computing a phase early/late indicator;

a phase control code processor for computing a difference phase indicator;

a frequency extractor for computing a low frequency jitter indicator;

a statistical calculator for computing a plurality of statistical measures regarding frequency and amplitude components of a jitter of an input continuous data signal, wherein the statistical measures are computed based on one of the phase early/late information indicator, the difference phase indicator, and the low frequency jitter indicator; and

a processor for aggregating the plurality of statistical measures and analyzing the aggregated data to detect various failure indicators indicating various malfunctions of the optical line, wherein the optical line is an optical fiber of a passive optical network (PON), wherein the optical fiber connects an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical splitter.

2. The apparatus of claim 1 , further comprising:

a down sampler for down sampling one of the phase early/late information indicator, the difference phase indicator, and the low frequency jitter indicator to a frequency work point of a filter; and

a filter for filtering the down sampled signal to a predefined frequency window in which the input continuous data signal is to be analyzed, wherein the output of the filter is fed to the statistical calculator.

3. The apparatus of claim 1 , wherein the phase position processor computes the phase early/late indicator based on a phase position of the input continuous data signal relatively to sampling clock signals.

4. The apparatus of claim 1 , wherein the phase control code processor computes the difference phase indicator based on an input phase control code.

5. The apparatus of claim 1 , wherein the frequency extractor computes the low frequency jitter indicator based on an input phase control code, wherein the low frequency jitter indicator is a binary representation of a frequency deviation between a reference clock and a clock of the input continuous data signal.

6. The apparatus of claim 1 , wherein the plurality of statistical measures include at least a maximum value, a minimum value, an absolute value, an average value, and a standard deviation value.

7. The apparatus of claim 1 , wherein the various failure indicators include at least: a reference clock that is not within a specified locking range of the input continuous data signal indicating on a potential malfunction of an ONU or an OLT if the same indication was detected for all ONUs; a low frequency measured jitter of an input continuous data signal indicating on either noisy transmission by the OLT or on an unstable power source of the ONU; and a measured jitter of an input continuous data signal is within a acoustic band indicating on acoustic interferences on the optical line.

8. The apparatus of claim 1 , wherein the various failure indicators are reported to a PON operator.

9. The apparatus of claim 1 , wherein the optical line carries data of a high-speed serial bus, wherein the high-speed serial bus comprises at least a Serial ATA (SATA) bus, a Peripheral Component Interconnect express (PCIe) bus, a Universal Serial Bus (USB), a Hypertransport bus, and an Infiniband bus.

10. The apparatus of claim 1 , is further capable to measure a transferred jitter of a signal transmitter by an ONU based on at least the phase control code.

11. A method for performing an optical line analysis of continuous data signals comprises:

computing a phase early/late indicator based on a phase position of an input continuous data signal relative to sampling clock signals;

computing a difference phase indicator based on an input phase control code;

computing a low frequency jitter indicator based on an input phase control code; and

computing a plurality of statistical measures regarding frequency and amplitude components of a jitter of the input continuous data signal, wherein the statistical measures are computed based on one of the phase early/late information indicator, the difference phase indicator, and the low frequency jitter indicator;

analyzing the plurality of statistical measures to detect various failure indicators indicating various malfunctions of the optical line, wherein the optical line is an optical fiber of a passive optical network (PON), wherein the optical fiber connects an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical splitter;

down sampling one of the phase early/late information indicator, the difference phase indicator, or the low frequency jitter indicator to a frequency work point of a filter; and

filtering the down sampled signal to a predefined frequency window in which the input continuous data signal is to be analyzed.

12. The method of claim 11 , wherein the various failure indicators include at least: a reference clock that is not within a specified locking range of the input continuous data signal indicating on a potential malfunction of an ONU or an OLT if the same indication was detected for all ONUs; a low frequency measured jitter of an input continuous data signal indicating on either noisy transmission by the OLT or on an unstable power source of the ONU; and a measured jitter of an input continuous data signal is within a acoustic band indicating on acoustic interferences on the optical line.

13. The method of claim 11 , wherein the various failure indicators are reported to a PON operator.

14. A non-transitory computer readable medium having stored thereon computer exactable code when executed by a processor causing the processor to perform the process of:

performing an optical line analysis of continuous data signals comprises:

computing a phase early/late indicator based on a phase position of an input continuous data signal relatively to sampling clock signals;

computing a difference phase indicator based on an input phase control code;

computing a low frequency jitter indicator based on an input phase control code; and

computing a plurality of statistical measures regarding frequency and amplitude components of a jitter of the input continuous data signal, wherein the statistical measures are computed based on one of the phase early/late information indicator, the difference phase indicator, and the low frequency jitter indicator;

analyzing the plurality of statistical measures to detect various failure indicators indicating on various malfunctions of the optical line, wherein the optical line is an optical fiber of a passive optical network (PON), wherein the optical fiber connects an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical splitter;

down sampling one of the phase early/late information indicator, the difference phase indicator, or the low frequency jitter indicator to a frequency work point of a filter; and

filtering the down sampled signal to a predefined frequency window in which the input continuous data signal is to be analyzed.

Assignments (9)