This attribute is used to control the trigger mode for the Upstream Triggered Spectrum Analysis sample capture. Values allowed for this attribute are listed and described below. Each trigger mode requires the Enable attribute to be set to true as well as the proper configuration settings applied which are applicable to the specific trigger mode. other: The CCAP initiates sampling the upstream spectrum as the result of a trigger condition not defined in this specification. freeRunning: The CCAP immediately initiates sampling and continues sampling until the length of time configured in attribute FreeRunDuration has transpired. Sampling terminates when the length of time configured in FreeRunDuration has elapsed or when FFT is disabled. The interval between captures is RepeatPeriod, or the minimum period supported by the CCAP, whichever is greater. miniSlotCount: The CCAP initiates sampling when the minislot number equals the value configured for attribute MinislotCount. sid:The CCAP immediately initiates capturing samples corresponding to the Service Flow identified with the Service Identifier (SID) numbered with the value of attribute Sid. The CCAP continues to sample the configured upstream spectrum after being triggered on transmissions corresponding to the specified SID until FFT is disabled or a new configuration is applied. idleSid: The CCAP immediately initiates capturing samples during an idle period selected by the CCAP. The CCAP will continue to sample the configured upstream spectrum during transmissions corresponding to the idle SID until FFT is disabled or a new configuration is applied. cmMacAddr: The CCAP immediately initiates sampling data on a grant for any SID assigned to the cable modem whose MAC address is the value of attribute CmMac. The CCAP continues to sample the configured upstream spectrum during transmissions corresponding to the configured CM MAC until FFT is disabled or a new configuration is applied. quietProbeSymbol: The CCAP immediately initiates sampling data when a configured OFDMA Quiet Probe Symbol occurs. The CCAP will continue to sample the configured upstream spectrum during Quiet Probe Symbols until FFT is disabled or a new configuration is applied. The Upstream Triggered Spectrum Capture test with quietProbeSymbol trigger is different from the Upstream Capture for Active and Quiet Probes PNM feature in that the Upstream Triggered Spectrum Capture test is more general than the Upstream Capture for Active and Quiet Probes test. Upstream Triggered Spectrum Capture test can be done in any band, while the Upstream Capture for Active and Quiet Probes test is specifically for an OFDMA channel. burstIuc: The CCAP immediately initiates sampling when the CCAP issues the grant for the configured burst Interval Usage Code. The CCAP will continue to sample the configured upstream spectrum during transmissions corresponding to the configured IUC until FFT is disabled or a new configuration is applied. timestamp: The CCAP initiates sampling when the configured timestamp occurs. The CCAP will continue to sample the configured upstream spectrum until FFT is disabled or a new configuration is applied; however, a single capture typically is made in this mode. This is the DOCSIS 3.1 timestamp defined in MULPIv3.1. Note that if the CCAP supports only one set of Upstream Triggered Spectrum Capture configuration, then if a test is configured with timestamp trigger it effectively blocks any other test setup and execution until it completes since setting up the other test will overwrite the timestamp test configuration.