This attribute is used to trigger an Upstream Triggered Spectrum Capture. Setting this attribute to true applies all configured upstream triggered spectrum sample capture attributes and initiates the triggered upstream spectrum sample capture and sample output conversion process. Read-write attributes, which are used to configure the Upstream Triggered Spectrum Capture, can only be configured while a test is not in progress. The CCAP MUST reject any attempt to modify a UsTriggeredSpectrumCaptureCfg table attribute, or UsTriggeredSpectrumCaptureCtrl table attribute for the same instance of InitiateTest configured to true when the triggered spectrum capture is in progress as indicated by value 'busy' for MeasStatus. The CCAP MUST allow writable UsTriggeredSpectrumCaptureCfg table attributes, or UsTriggeredSpectrumCaptureCtrl table attributes to be modified if the value of attribute MeasStatus for the instance is not 'busy'. The CCAP initiates an upstream triggered spectrum sample capture only if Enable bit 1 is set to true, InitiateTest is set to true and all of the UsTriggeredSpectrumCaptureCfg configuration attributes are properly configured. Refer to section 7.3.4.1.6 and Table 1 of the Reference. While a test is in progress, this attribute returns the value true. Configuring a value of false for this attribute, while a test is in progress, will abort the currently executing test. If a test is aborted, the result data is discarded.