98-16081bSystemLEDsNETDSU/CSU3166Port1OKFailTestSigOOFAlrmEERDTRTXDRXDCTSRTSSelectInOutNetMonSDCP Operation3-4 3166-A2-GB20-20March 1999LEDsThere are twelve LEDs on the 3166 DSU/CSU front panel.A green LED indicates normal operation. A yellow LED indicates activity.Conditions are sampled every tenth of a second.The twelve front panel LEDs are grouped into three sections to indicate the statusof the: System (Table 3-1) Network Interface (Table 3-2) Data Port (Table 3-3)Table 3-1. System LEDsName Color MeaningOK(Select)Green Indicates the current operational state of the DSU/CSU.ON : The DSU/CSU is operational and has power.OFF : The DSU/CSU is performing a power-up self-test or asystem failure has occurred.BLINKING : A software download is in progress.FAST BLINK : The DSU/CSU is currently selected by the SDCP.Fail Yellow Indicates a system failure or a self-test.ON : A device error/fault is detected or a reset has justoccurred.OFF : No system failures are detected.BLINKING : A self-test is in progress.Test Yellow A system test is in progress.ON : A loopback or pattern test has been initiated eitherlocally, by the network, or externally.OFF : No tests are active.
