Systems, methods and computer program products for identifying digital impairments in modem signals

A method of identifying Robbed Bit Signaling (RBS) and PAD digital impairments in a plurality of sets of Digital Impairment Leaning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during a corresponding plurality of DIL intervals, the method comprising the steps of:

• generating the models of DIL signals having combinations of RBS types and PAD levels;
• computing sums of squares of differences between selected ones of the DIL signals in the plurality of sets and model DIL signals having combinations of RBS types and PAD levels;
• and
• for each DIL interval, selecting a model that matches the selected DIL signals in the DIL interval to thereby identify RBS and PAD impairments for each DIL interval.

A method of identifying Robbed Bit Signaling (RBS) and PAD digital impairments in a plurality of sets of Digital Impairment Leaning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during a corresponding plurality of DIL intervals, the method comprising the steps of:

• responsive to a plurality of model DIL signals that correspond to a plurality of PAD levels that are not subject to RBS;
• identifying a PAD level for the plurality of sets of DIL signals in the plurality of DIL intervals;
• and
• responsive to a plurality of model DIL signals that correspond to a plurality of RBS types that are subject to the PAD level so identified;
• and
• identifying an RBS type for individual sets of DIL signals, based upon the PAD level so identified.

A modem comprising:

• means for receiving a plurality of sets of Digital Impairment Learning (DIL) signals from a server modem during a corresponding plurality of DIL intervals;
• means for identifying one of the DIL intervals that contains DIL signals that are not subject to Robbed Bit Signaling (RBS) digital impairments;
• means for determining a Packet Assenbler/Disassembler (PAD) level digital impairment for the DIL signals in the one of the DIL intervals so identified;
• and
• means for applying the PAD level so determined to the DIL signals in remaining ones of the DIL intervals, to identify an RBS type for the DIL signals in the remaining ones of the DIL intervals.

A modem comprising:

• means for receiving a plurality of sets of Digital Impairment Learning (DIL) signals from a server modem during a corresponding plurality of DIL intervals;
• means for generating the models of DIL signals having combinations of RBS types and PAD levels;
• and
• means for computing sums of squares of differences between selected ones of the DIL signals in the plurality of sets and said generated model DIL signals;
• and
• means for selecting a model that matches the selected DIL signals for each DIL interval to thereby identify RBS and PAD impairments for each DIL interval.

A modem comprising:

• means for receiving a plurality of sets of Digital Impairment Learning (DIL) signals from a server modem during a corresponding plurality of DIL intervals;
• means responsive to a plurality of model DIL signals that correspond to a plurality of PAD levels that are not subject to RBS, said means for identifying a PAD level for selected ones of the plurality of sets of DIL signals in the plurality of DIL intervals;
• and
• means responsive to a plurality of model DIL signals that corresponds to a plurality of RBS types that are not subject to the identified PAD level, said means for identifying an RBS type for the selected sets of DIL signals, based upon the identified PAD level.

A computer program product for identifying Robbed Bit Signaling (RBS) and PAD digital impairments in a plurality of sets of Digital Impairment Learning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during a corresponding plurality of DIL intervals, the computer program product comprising a computer-readable storage medium having computer-readable program code embodied in the medium, the computer-readable program code comprising:

• computer-readable program code for identifying one of the DIL intervals that contains DIL signals that are not subject to RBS;
• computer-readable program code for determining a PAD level for the DIL signals in the one of the DIL intervals so identified;
• and
• computer-readable program code for applying the PAD level so determined to the DIL signals in remaining ones of the DIL intervals, to identify an RBS type for the DIL signals in the remaining ones of the DIL intervals.

A computer program product for identifying Robbed Bit Signaling (RBS) and PAD digital impairments in a plurality of sets of Digital Impairment Learning (DIL) signals that are repeatedly transmitted from a server modem to a client modem during a corresponding plurality of DIL intervals, the computer program product comprising a computer-readable storage medium having computer-readable program code embodied in the medium, the computer-readable program code comprising:

• computer-readable program code for generating models of DIL signals having combinations of RBS types and PAD levels;
• and
• computer-readable program code for computing sums of squares of differences between selected ones of the DIL signals in the plurality of sets and the generated mode DIL signals having;
• and
• computer-readable program code for selecting a model that matches the selected DIL signals for each DIL interval to thereby identify RBS and PAD impairments for each DIL interval.