You can run two types of circuit tests in Control Center: performance metrics (PM) and intrusive circuit tests.
You can run performance metrics tests on circuits without taking them offline. For this reason, performance metrics tests are called non-intrusive tests because they don't intrude on your day-to-day work activities. After you request the test, the test is run almost immediately.
Performance metrics tests are your first-line-of-testing defense. These tests check to see if the circuit is being overused or exceeding its bandwidth. If it is, you're probably experiencing latency and jitter and the problem could be with your equipment or our network.