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)

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

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

No EXT Clock

No external transmit clock at DTE (only appears

 

if EXT CLK is selected)

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ADTRAN TSU 120e user manual Alarm Messages, Network Interface NI, Nx56/64 Interface