Upstream Impulse Noise is a PNM Test described in [PHYv3.1] Upstream Impulse Noise Statistics section. Additional information is available in PNM Current Methods and Practices in HFC Networks (DOCSIS 3.1), CM-GL-PNM-3.1-V04-230213, Upstream Impulse Noise Statistics section. The CmtsUsImpNoiseTable defines the management interface for the operator to configure, execute, and monitor the Upstream Impulse Noise test. This table provides statistics of burst/impulse noise occurring in a selected narrow band. A bandpass filter is positioned in an unoccupied upstream band. A threshold is set, energy exceeding the threshold triggers the measurement of an event, and energy falling below the threshold ends the event. An optional feature allows the threshold to be set to zero, in which case the average power in the band will be measured. The measurement is time-stamped using the DOCSIS 3.0 field of the 64-bit extended timestamp (bits 9-40, where bit 0 is the LSB), which provides a resolution of 98 ns and a range of 7 minutes. The CCAP may support simultaneous instances of the Upstream Impulse Noise test on more than one RF port at a time. The CCAP provides the capability to capture the following statistics in a selected band up to 5.12 MHz wide: Timestamp of event, Duration of event, Average power of event. The CCAP provides a time history buffer of up to 1024 events. In steady state operation, a ring buffer provides the measurements of the last 1024 events that occurred while the measurement was enabled. The CCAP should create a row in the docsPnmCmtsUsImpNoiseTable for each ifIndex of an upstream RF Port. Initiation and termination of impulse noise samples collection is controlled by UsImpulseNoise attributes FreeRunDuration, StartTriggerLevel, and EndTriggerLevel. The CCAP should collect Upstream Impulse Noise samples when UsImpNoiseEnable is set to 'true' and FreeRunDuration is configured for a nonzero value, regardless of the values configured for StartTriggerLevel and EndTriggerLevel. The CCAP should stop collecting Upstream Impulse Noise samples and terminate the Upstream Impulse Noise test when the time corresponding to the value of FreeRunDuration expires. If the configured value of FreeRunDuration is nonzero, the CCAP will capture at most one impulse noise event. The CCAP should collect Upstream Impulse Noise samples when UsImpNoiseEnable is set to 'true', FreeRunDuration is configured with zero, StartTriggerLevel is configured with a nonzero value, and the burst noise on the upstream RF port exceeds the value configured for StartTriggerLevel. The CCAP should stop collection of Upstream Impulse Noise samples for a burst noise event when FreeRunDuration is configured with zero, StartTriggerLevel and EndTriggerLevel are configured with a nonzero value, and the burst noise on the upstream RF port falls below the configured value for EndTriggerLevel. If the configured value of FreeRunDuration is zero, the configured value of StartTriggerLevel is nonzero, and the configured value of EndTriggerLevel is nonzero, the CCAP could capture multiple burst noise events before the sample capture is terminated when UsImpNoiseEnable is set to 'false'. If the configured values of FreeRunDuration and EndTriggerLevel are zero and the configured value of StartTriggerLevel is nonzero, the CCAP will capture at most one impulse noise event before the sample capture is terminated when UsImpNoiseEnable is set to 'false'. The CCAP should measure average power in the band when UsImpNoiseEnable is set to 'true' and configured values for FreeRunDuration and StartTriggerLevel are zero, and the configured value for EndTriggerLevel is zero or nonzero. The average power in the band will be measured until sample collection is terminated when UsImpNoiseEnable is set to 'false'. The CCAP should reject configuring a value for the DestinationIndex of the UsImpulseNoise object if that value does not exist in the corresponding DestinationIndex attribute of the DataTransferCfg instance.