Introduction to Performance Events

When the optical transport network is running normally, the internal and external factors, such as noise sources, dispersion, and fiber break, may affect the transmission quality in the forms of bit error, jitter, drift, and delay. The influence is called transmission impairment. These impairments are presented as various performance events on the Web LCT.

Performance Event Type		Description	Reference
SDH performance	Traditional SDH performance	SDH performance events monitor and evaluate bit error and jitter factors that will cause pointer justification on devices. SDH performance events include SDH regenerator section (RS), multiplex section (MS), higher order path, lower order path, laser, board, and E1 performance events.	Viewing SDH/WDM Performance Data
SDH performance	SDH-like performance
WDM performance		WDM performance events monitor and evaluate bit error and jitter factors that will cause pointer justification on devices. WDM performance events include check and correction, device function, MS error bit, RS bit error, OTN, and fiber channel (FC) service performance events.
RMON performance		RMON performance events monitor and evaluate the communication quality of ports that carry data services. RMON performance events include Ethernet, CES, L2VPN, L3VPN, QoS, ATMoPWE3, ATM/IMA, tunnel, PW, ML-PPP, and SDH port performance events.	Viewing RMON Performance Data
Ethernet port performance		Ethernet port performance events monitor Ethernet services on ports.	Viewing Ethernet Port Flow
ATM port performance		ATM port performance events monitor ATM services on ports.	Viewing Performance Data of an ATM Port
Ethernet IP performance		Ethernet IP performance events monitor Ethernet IP performance of ports on ET1 boards.	Viewing IP Performance of Ethernet Ports
Lower order performance		Lower order performance events monitor performance of VC4 lower order services on N3SL64 and N4SL16 boards by setting the tributary unit group (TUG) structure. When a third-party lower order service enters the local equipment through the VC4 path, you can monitor the performance of this service. This helps you determine whether the performance or alarms of this service are of the local equipment. By setting the TUG structure in the receiving direction of the VC4 path, you can determine the class of the lower order service. If the class of a third-party lower order service is already determined, you can enable the monitoring of lower order alarms and set the specific alarms to be monitored, to monitor the performance of the service. For details see Figure 1.	Viewing Lower Order Performance Data

Figure 1 Lower order performance

NOTE:

For details on the performance event types supported by devices, see Maintenance and Fault Management > Alarms and Events Handling > Performance Event List in the product documentation of the devices.

The performance is different from an alarm. When a performance event is reported, the service is not interrupted. The transmission quality, however, is degraded compared to the normal situation and the degradation is temporarily compensated by the error correction mechanism of the equipment. As the degradation factors increases, the performance threshold crossing and even an alarm may occur.

You can use the performance management function to detect the degrade trend and to handle the trouble before the failure actually occurs.

The indicator of a performance event is mainly reflected by the performance value.