ADTRAN TSU LT, User Manual

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TSU LT User Manual Chapter 4 Status Menu
61203060L1-1A © 2003 ADTRAN, Inc. 37
ERR/ALM HIST MENU
Use this branch for viewing a history of errors and alarms. If an alarm has occurred since the last
C
LEAR
H
ISTORY
selection, the menu condition is active; otherwise it is inactive (see Figure 4-4). Table 4-2
provides a complete list of the errors and alarms.
Figure 4-4. Clear History Screen
Table 4-2. Alarms and Errors (Current and Historical)
Errors and Alarms Meaning
Loss of Signal No pulses received at NI
AIS Alarm Unframed All-Ones received at NI
Out of Frame No framing pattern sync at NI
Yellow Alarm Receiving yellow alarm pattern from NI
Red Alarm Loss of signal/out of frame (LOS/OOF) causing red alarm at NI
Code Violations Cyclic redundancy check (CRC) errors in ESF, or bipolar violations (BPVs) in Superframe
Format (SF) were received at NI
Bipolar Violations BPVs (the presence of two consecutive bits of the same polarity) in SF or ESF
Frame Bit Errors Frame Bits received incorrectly at NI
PLL Alarm Unable to sync up to selected clock