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Cisco ONS 15310-MA SDH Reference Manual, Release 9.1 and Release 9.2
78-19417-01
Chapter 11 Performance Monitoring
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 is sent to
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 PM parameter is disabled.
Change the threshold if the default value does not satisfy your error monitoring needs. For example,
customers with a critical E1 installed for 911 calls must guarantee the best quality of service on the line;
therefore, they lower all thresholds so that the slightest error raises a TCA.
When TCAs occur, CTC displays them in the Alarms tab. For example, in Figure 11-1, T-UASP-P is
shown under the Cond column. The “T-” indicates a threshold crossing alert.
For the E1 and E3/DS3 electrical ports on the 15310-MA SDH E1_21_E3_DS3_3 and
E1_63_E3_DS3_3 cards, RX or TX is appended to the TCA description (see the red circles in
Figure 11-1). RX indicates that the TCA is associated with the receive direction, and TX indicates the
TCA is associated with the transmit direction.
Figure 11-1 TCAs Displayed in CTC
For electrical ports, only the receive direction is detected and appended to TCA descriptions. The E1 and
E3/DS3 ports for which RX is appended to TCA descriptions are shown in Table 11-1.
Table 11-1 Electrical Ports that Report RX Direction for TCAs
Port Line Path
Near End Far End Near End Far End
E1 YES YES YES YES
DS-3 YES — YES YES
E3 YES YES YES YES
