When this attribute is set to 'true' the CM must begin the SummaryType codeword error summary test. While the test is in progress, the CM must return a MeasStatus value of 'busy'. When the measurement is complete the CM must set the MeasEnable attribute to 'false'. If this attribute is set to 'false' during a test, the CM must stop the test. Interaction with other table rows: - This object is subject to the rules specified by the 'docsPnmCmCtlStatus' object. Therefore this object returns 'inconsistentValue' if set to 'true' while the value of 'docsPnmCmCtlStatus' is any value other than 'ready'. - 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. - A default value for 'docsPnmCmDsOfdmFecFileName' is defined; thus, this object may be set to 'true' without explicitly setting this value. - Setting this object to a value of 'true' will change the value of the 'docsPnmCmDsOfdmFecMeasStatus' to 'busy'. The CM must return the value of 'true' if it is actively taking a measurement; otherwise it must return 'false'.