Chapter 3. Operation61200.076L2-1 TSU 600 User Manual 4 1• Test (yellow)Indicates that one of the interfaces is operating in atest mode. This includes a self test or a test loop-back. When lighted, this LED also indicates thatnormal data flow is not occurring in at least one ofthe module ports.• Alarm (red)Indicates an alarm condition has been detected.When the alarm condition is no longer valid, the OKLED activates (turns on). To view an alarm condi-tion, select the active alarm menu item or selectAlarm by pressing shift 8. If the alarm conditionshave been corrected, the alarm which caused theactivation of the Alarm LED can be viewed underthe Unit History menu.LCD WindowA 2x16 character backlit LCD window displays menuitems used in the configuration of the unit. It alsodisplays alarm and status information.CSU StatusIndicates the status of the network interface located onthe controller board in the unit. These LEDs show thesame indication as the Module, with the addition ofthe Error LED. The Error LED indicates an error suchas BPV, OOF, or CRC error.Operation KeysCopyUsed in the DS0 mapping menu operations to copy thelast data entered into the current DS0. This keyoperates without pressing the Shift key.RemoteReserved for future use.HomeUsed to return home to the Main menu from anymenu location.
