Datasheet

15-2
Cisco ONS 15454 SDH Reference Manual, R7.0
October 2008
Chapter 15 Performance Monitoring
15.1 Threshold Performance Monitoring
During the accumulation cycle, if the current value of a performance monitoring parameter reaches or
exceeds its corresponding threshold value, a threshold crossing alert (TCA) is generated by the node and
displayed by CTC. TCAs provide early detection of performance degradation. When a threshold is
crossed, the node continues to count the errors during a given accumulation period. If 0 is entered as the
threshold value, the performance monitoring parameter is disabled.
When TCAs occur, CTC displays them. An example is T-UASP-P in the Cond column, where the “T-”
indicates a threshold crossing (Figure 15-1). 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 SDH 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
E1-42 YES — — — YES YES — —