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Cisco ONS 15454 Reference Manual, R7.0
78-17191-01
Chapter 15 Performance Monitoring
15.1 15.1 Threshold Performance Monitoring
During the accumulation cycle, if the current value of a PM parameter reaches or exceeds its
corresponding threshold value, a threshold crossing alert (TCA) is generated by the node and displayed
by CTC. TCAs provide e arly detection of performance degradation. When a threshold is crossed, the
node continues to count the errors during a given accumulation period. If zero is entered as the threshold
value, generation of TCAs is disabled, but performance monitoring continues.
When TCAs occur, CTC displays them. An example is T-UASP-P in the Cond column (shown in
Figure 15-1), where the “T-” indicates a threshold crossing. In addition, for certain electrical cards,
“RX” or “TX” is appended to the TCA description, as shown (see red circles). The RX indicates that the
TCA is associated with the receive direction, and TX indicates the TCA is associated with the transmit
direction.
Figure 15-1 TCAs Displayed in CTC
The ONS 15454 SONET electrical cards for which RX and TX are detected and appended to the TCA
descriptions are shown in Table 15- 1.
Table 15-1 Electrical Cards that Report RX and TX Direction for TCAs
Card Line Path
Near End Far End Near End Far End
RX TX RX TX RX TX RX TX
DS1-14 YES — YES — YES YES YES —
DS1N-14 YES — YES — YES YES YES —