Chapter 3. Operation3-4 ATLAS_800PLUS User Manual 61200226L1-1Channel Service Unit (CSU) StatusThe CSU Status LEDs indicate the status of both network interfaces.Module Status LEDsThe Module Status LEDs display, by row, the operational condition (Status,Online, and Test) of each module installed in the option slots.OnlineThe Online LED indicates that the module is available for use or is currently inuse. If the module is manually taken offline, this LED is turned off.Test (yellow)One or more ports in a module is in test.This color light... Indicates this CSU status...OK (green) Indicates normal, error-free operation of both networkinterfaces. If either interface experiences alarms, the OK LEDremains off.Test (yellow) Indicates that one of the interfaces is operating in a test mode.This includes a self-test, a test pattern, or a test loopback.When illuminated, this LED also indicates that normal dataflow is not occurring in at least one of the module ports.Error (flashing red) The Error LED indicates an error such as BPV (bipolarviolation), OOF (out of frame), or CRC (cyclic redundancycheck).Alarm (red) Indicates an alarm condition has been detected. When thealarm condition is no longer valid, the OK LED illuminates. Toview an alarm condition, select the active alarm menu item orselect Alarm by pressing Shift+8. If the alarm conditions havebeen corrected, you can view the alarm which caused theactivation of the Alarm LED under the View History menu.This color light... Indicates this module status...Green (solid) The module is OK.Green (blinking) The module has been disabled by the user.Red (solid) At least one port on the module has an alarm.Red (blinking) The module is enabled, but is not responding to the system controller.Off No module occupies the slot.
