Appendix C System Messages

This appendix lists and defines the alarm and status mes- sages that appear on the monitor screen.

ALARM MESSAGES

Network Interface (NI)

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.

Nx/DBU Interface

The following messages indicate an alarm condition on the Nx/DBU port:

Clock Slip

Difference in frequency of the data clock at the network and DTE.

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ADTRAN TDU 120e user manual Appendix C System Messages, Alarm Messages, Network Interface NI, Nx/DBU Interface