OMS 3250

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OMS3250Product Description13 PERFORMANCE MONITORING AND MANAGEMENT13.1 SDH Performance monitoringThe transmission quality on tributary interfaces is monitored in accordance with ITU-T G.784and G.828.The monitoring of performance parameters is based on the evaluation of errored blocks (EB).The parameters that are related to the performance monitoring are provided in the following:• BBE (Background Block Error);• ES (Errored Second);• SES (Severely Errored Second);• OFS (Out of Frame Second);Furthermore the following additional parameters can be optionally monitored:• CSES (Consecutive SES);• UAS (Unavailable Seconds);• AU PJE (Negative/Positive Administrative Unit Pointer Justification Events).All these parameters are evaluated and stored, during available time, in 15 min and 24 hregisters according to G.784 requirements.Such performance data is available to the System Manager (operator) (see EquipmentManagement).13.2 OTN performance monitoringAs required by ITU-T G.798 and ITU-T draft recommendation G.optperf, performanceMonitoring can be carried out at the following layers of a signal transported in an OTN network:• Ochr to OTUk Adaptation layer (Performance on Forward Error Correction).The number of corrected bits are counted over 1 second and reported to the managementsystem at the end of the second, unless TSF, dAIS, dLOM or dLOF are present.• OTUk Termination based on SM overhead bytes information.Performance on OTUk Termination is specifically created to enable the monitoring of theperformance of an end-to-end OTUk trail. Both Near End and Far End performancemonitoring can be enabled. For both directions the following parameters can be collected:ES, SES, BBE, UAS, CSES, IAE (one second period in which at least one dIAE defect isdetected).• ODUkP Termination or Monitoring based on PM overhead bytes information.Issue 1 Copyright – Refer to Page 2 Page 63 of 74
Product DescriptionOMS3250Performance on ODUkP Termination (Monitoring) are specifically created to enable themonitoring of the performance of an end-to-end (or part of an) ODUk path. Both Near Endand Far End performance monitoring can be enabled. For both directions the followingparameters can be collected: ES, SES, BBE, UAS, CSES.Page 64 of 74 Copyright – Refer to Page 2 Issue 1
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OMS 3250

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