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61200054L2-1 Nx56/64 (EIA-530) Option Module User Manual A-1
Appendix A System Messages
ALARM MESSAGES
Network Interface (NI)
Red Alarm
NI unable to align frame with incoming signal
Yellow Alarm
Remote alarm indication (RAI) being received from the
far end
Blue Alarm
Unframed all 1s (AIS) being received at NI
Loss of Signal
No signal detected at NI
Nx56/64 Card
Clock Slip
Difference in frequency of the data clock at the network
and DTE
PLL Alarm
Unable to lock phase lock on the clock provided by the
network interface
Zeros Alarm
All 0s data being sent to the network interface