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Chapter 4. Status Menu
61202076L1-1 TSU 600 User Manual 4-3
If insufficient time has passed to collect data, NA displays. Continue
with standard operating procedures to exit the display.
When this menu is active, performance data can be cleared by pressing
Clear (Shift 9) on the keypad. Only the user copy of the performance
data is cleared.
Since only the user’s copy of performance data is cleared by the TSU 600,
the data displayed here might be different from the data sent to the net-
work as PRM data.
Network Interface Errors (NI ERRORS)
The NI Errors submenu displays the types of errors the Network Inter-
face (NI) detects. A blinking CSU error LED indicates that network er-
rors are detected.
The asterisk (*) above an item indicates the type of errors detected. The
error types are as follows:
CRC CRC-6 bit errors based on the FDL.
This is valid only in ESF mode.
BPV Bipolar violations.
XS0 Excess zeros.
FER Framing errors.