STM
STM is expanded two ways:
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An NFM-P facility that allows the manual creation and automatic generation of tests and test suites. STM tests and test suites can be run on demand or scheduled to run periodically on services and service transport components for SLA QoS validation and troubleshooting.
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The synchronous end-to-end transmission of data or voice containers in a network. STM is a component of SDH.