User manual

Chapter 4. Status Menu
61202156L1-1 TDU 120e User Manual 4-3
Network Interface Errors
The NI E
RRORS
submenu displays the types of errors the Net-
work Interface (NI) detects. A blinking CSU error LED indi-
cates that network errors are detected.
The asterisk (*) above an item indicates the type of errors
detected. The error types are shown in Table 4-1.
Active Alarms
This menu item displays a list of current alarms reported by
either the base controller or any of the ports. If no alarms are
current, using this menu item displays
End of List
.
The display in Table 4-2 on page 4-3 includes two text fields.
The left field is the alarm source. The right field is the alarm
message. A list of alarm messages is found in Appendix C,
System Messages on page C-1.
If one or more of the Alarm LEDs are illuminated, an alarm is
present. Press
Escape
to return to the previous menu item.
Table 4-1. NI Error Types
Error Type Description
CRC CRC-6 bit errors based on the FDL. This is
valid only in ESF mode.
BPV Bipolar violations
XSO Excess zeros
FER Framing errors
Table 4-2. Alarm Message Display
ACTIVE ALARMS
NETWORK (NI)
NETWORK (NI)
END OF LIST
LOSS OF SIGNAL
RED ALARM