Hardware maintenance tools Page 35 of 162Communication Server 1000E MaintenanceNTAK79 Faceplate LEDsThe NTAK79 2 Mbit PRI circuit card has a total of seven faceplate LEDs.Five of the LEDs are directly associated with the operation of the PrimaryRate interface (PRI). The remaining two LEDs are associated with theon-board Clock Controller and the on-board D-channel interface (DCHI).NEA On (Yellow) A near-end alarm state has been detected.Off No near-end alarm.FEA On (Yellow) A far-end alarm state has been detected.Off No far-end alarmLBK On (Yellow) The NTAK10 2 Mbit DTI is in loopback mode.Off The NTAK10 2 Mbit DTI is not in loopback mode.CC On (Red) The clock controller is switched on and disabled.On (Green) The clock controller is switched on and is eitherlocked to a reference or is in free-run mode.Flashing (Green) The clock controller is switched on and is attemptingto lock (tracking mode) to a reference. If the LEDflashes continuously over an extended period of time,check the CC STAT in LD 60. If the CC is tracking,this can be an acceptable state. Check for slips andrelated clock controller error conditions. If none exist,then this state is acceptable, and the flashing isidentifying jitter on the reference.Off The clock controller is switched off.Table 2NTAK10 LEDs (Part 2 of 2)LED State Definition
