Prescriptive and diagnostic system and method for combined RF/optical transmission management
A diagnostic and prescriptive system and method for management of a combined optical and RF cable plant system. In an exemplary embodiment the method and system uses optical receivers in a hub or headend to determine a variety of cable plant parameters such as the OMI of the received signal and automatically facilitated prescriptive service through prioritization and automatic recalibration. In another exemplary embodiment the method allows doing such signal OMI measurements in a closed loop system (that is a fully operational system). In addition, a further exemplary method and system allows storing of standard receiver calibration information such that from thereon signal OMI measurements that can be performed without signal interruption.
1. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
collecting network performance parameters related to a network circuit;
comparing the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance;
selecting a circuit, based on the comparing step, in which at least one of the network performance parameters falls below the respective threshold;
determining at least one additional network performance parameter to be analyzed on the selected circuit, the additional network performance parameter comprising at least an RF power measurement;
outputting a recommended prescribed modification to the selected circuit based on the at least one additional tested network performance parameter,
the RF power measurement includes a measurement of an optical modulation index (OMI) of the signal;
the measurement of the OMI is performed on a calibrated receiver, and
the calibration of the receiver includes using a reference transmitter, and establishing an optical power into the calibrated receiver to compute RF power at an RF test point.
2. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
collecting network performance parameters related to a network circuit;
comparing the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance;
selecting a circuit, based on the comparing step, in which at least one of the network performance parameters falls below the respective threshold;
determining at least one additional network performance parameter to be analyzed on the selected circuit, the additional network performance parameter comprising at least an RF power measurement;
outputting a recommended prescribed modification to the selected circuit based on the at least one additional tested network performance parameter,
the circuit comprises a customer modem, a RF plant, optical node, reverse transmitter, reverse headend receiver and CMTS;
determining the RF power measurement relative to an expected power for a predetermined OMI;
adjusting the modem output power by changing an attenuator corresponding to the CMTS such that the CMTS sets the modem at a desired output power through automatic power gain control; and
adjusting gain in the RF plant if the modem power has reached a limit.
3. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
collecting network performance parameters relating to a network circuit;
comparing the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance;
selecting a circuit, based on the comparing step, in which at least one of the network performance parameters falls below a respective threshold;
outputting a recommended prescribed modification to the selected circuit based on the at least one of the network performance parameters falls below a respective threshold, the at least one network performance parameters comprises an RF power measurement;
the RF power measurement includes a measurement of an optical modulation index (OMI) of the signal;
the measurement of the OMI is performed on a calibrated receiver;
the calibration of the receiver includes using a reference transmitter, and establishing an optical power into the calibrated receiver to compute RF power at an RF test point.
4. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
collecting network performance parameters relating to a network circuit;
comparing the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance;
selecting a circuit, based on the comparing step, in which at least one of the network performance parameters falls below a respective threshold;
outputting a recommended prescribed modification to the selected circuit based on the at least one of the network performance parameters falls below a respective threshold;
the circuit comprises a customer modem, a RF plant, optical node, reverse transmitter, reverse headend receiver and CMTS;
determining the received RF signal power relative to an expected power for a predetermined OMI;
adjusting a power level of the modem by changing an attenuator corresponding to the CMTS such that the CMTS sets the modem at a desired output power through automatic power gain control; and
adjusting gain in the RF plant if the modem power has reached a limit.
5. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
at least one network computing device collecting electrical and/or optical signals representing network performance parameters relating to a network circuit comprising a customer modem, a RF plant, optical node, reverse transmitter, reverse headend receiver and CMTS;
the network computing device applying at least one processor to compare the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance, to select a circuit, based on the comparing step, in which at least one of the network performance parameters falls below a respective threshold; to compare the variation of at least one of the network performance parameter over a long term and at least one of another parameters over a short term; to output a recommended prescribed modification to the selected circuit based on the comparison of the at least one of the network performance parameter over a long term and the at least one of another parameters over a short term; and to estimate ingress based on the difference between the at least one of the network performance parameter over a long term and at least one of another parameters over a short term, and a theoretical error estimation based on the reported CNR.
6. A method of diagnostic and prescriptive management of hybrid fiber-coax network, comprising:
at least one network computing device collecting electrical and/or optical signals representing network performance parameters relating to a network circuit comprising a customer modem, a RF plant, optical node, reverse transmitter, reverse headend receiver and CMTS;
the network computing device applying at least one processor to compare the collected network performance parameters with predetermined thresholds corresponding to the collected network performance parameters to grade circuit performance; to select a circuit, based on the comparing step, in which at least one of the network performance parameters falls below a respective threshold; to compare the variation of at least one of the network performance parameter over a long term and at least one of another parameters over a short term; to output a recommended prescribed modification to the selected circuit based on the comparison of the at least one of the network performance parameter over a long term and the at least one of another parameters over a short term; and to estimate ingress based on the difference between the at least one of the network performance parameter over a long term and at least one of another parameters over a short term, and a theoretical CNR estimation based on the reported error rate.