ADTRAN TSU 120e - Manual (Page 125)

61202129L1-1 TSU 120 User Manual D-1
Appendix D
System Messages
This appendix lists and defines the alarm and status messages
that appear on the TSU 120 screen.
ALARM MESSAGES
Network Interface (NI)
Nx56/64 Interface
The following messages indicate an alarm condition on the
Nx56/64 card:
Red Alarm NI unable to frame align with incoming signal
Yellow Alarm Remote alarm indication (RAI) being received
from far end
Blue Alarm Unframed all ones (1s) (AIS) being received at NI
Loss of Signal No signal detected at NI
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
No EXT Clock No external transmit clock at DTE (only appears
if EXT CLK is selected)