Monitoring the DSU/CSU6-37112-A2-GB20-20 March 1998System LEDsOK:ON – DSU/CSU is operational.OFF – DSU/CSU is performing a power-up self-test, has detected asystem failure, or there is no power.FAIL:ON – DSU/CSU has detected a system or device failure, oris performing a power-up self-test. Refer toTroubleshooting in Chapter 8.TEST:ON – Test in progress. Test can be initiated locally, remotely,or from the network. Includes power-up self-test.
