Appendix D. TSU 120 System Messages120 TSU 120 User Manual 61200.129L1-1ALARM MESSAGESNetwork Interface (NI)The following messages indicate an alarm conditionon the network interface:Red Alarm NI unable to frame align withincoming signalYellow Alarm Remote alarm indication (RAI)being received from far endBlue Alarm Unframed all ones (1s) (AIS)being received at NILoss of Signal No signal detected at NINx56/64 InterfaceThe following messages indicate an alarm conditionon the Nx56/64 card:Clock Slip Difference in frequency of thedata clock at the network andDTEPLL Alarm Unable to achieve Phase LockedLoop on theclock provided by thenetwork interfaceZeros Alarm All zeros (0s) data being senttoward the network interfaceFIFO Alarm Error in propagation of datathrough the FIFOSNo EXT Clock No external transmit clock at DTE(only appears if EXT CLK isselected)Status Messages
