Setting this object to a value of 'true' instructs the CCAP to begin collection of histogram data and when enabled, the CCAP continues producing new data at its own rate. This value is only allowed to be set to 'true' if the value of 'docsPnmCmtsUsHistMeasStatus' is a value other than 'busy'. Setting this value to 'true' will change the value of the 'docsPnmCmtsUsHistMeasStatus' to 'busy'. Setting this object to a value of 'false' instructs the CCAP to stop the collection of histogram data and to generate the file. This object returns 'true' if the CCAP is actively collecting histogram data. Otherwise it returns 'false'. A restart may be accomplished by setting this attribute to 'false' and then back to 'true'. Interaction with other table rows: - This object returns 'inconsistentValue' if set to 'true' while the value of 'docsPnmCmtsUsHistMeasStatus' is a value of 'busy' for this row OR for any row in the table. That is, ONLY ONE ROW IN THE TABLE MAY BE ALLOWED TO BE 'true' AT THE SAME TIME. - This object returns 'inconsistentValue' if set to 'true' while the CM is in DOCSIS Light Sleep (DLS) mode or the CM is in battery-backup mode. - Setting this object to a value of 'true' will change the value of the 'docsPnmCmtsUsHistMeasStatus' to 'busy'.