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A ppendix C. System Messages
C-2 ESU 120e User Manual 1200420L1-1
Nx56/ 64 Interface
The following messages indicate an alarm condition on the Nx56/
64 card:
Clock Slip Difference in frequency of the data clock at the
network and DTE
PLL Alarm Unable to achieve Phase Locked Loop on the
clock provided by the network interface.
Zeros Alarm All zeros (0s) data being sent toward the network
interface
FIFO Alarm Error in propagation of data through the FIFOs
No EXT Clock No external transmit clock at DTE (only appears
if EXT CLK is selected)