ANT-20/ANT-20E Broadband Analyzer/GeneratorSpecifications “ATM Layer” S-72 Receiver2.1 DescramblingDescrambling as per ITU-T recommendation I.432 (X 43 + 1).The Descrambler can be disabled.2.2 General Functions2.2.1 Error Measurements (Anomalies)The following anomalies are evaluated and displayed in addition to the errors on the physicallayer. These errors are detected for the entire cell stream.2.2.2 Alarm Detection (Defects)2.2.3 Receiver BandwidthDisplay of momentary bandwidth of all virtual channels in the physical connection in Mbit/s andas a percentage. The percentage is referred to the theoretical maximum bandwidth for theselected mapping setting.Anomaly Count ExplanationHEC Error Count correctable yes Correctable cell header errorsHEC Error Count uncorrectable yes Uncorrectable cell header errorsTable S-3 Display of possible anomaliesDefect LED Defect Seconds Count 1 ExplanationLoss of Cell Delineation Software LEDs forhistory and actualstatusyes Loss of cellsynchronizationPhysical Layer Defect Software LEDs forhistory and actualstatusyes Sum alarm forphysical layer errors.Activated when ananalyzable cellstream is no longerpresent.1 A “Defect Second” is counted if the event occurs at least once within a one-second interval.Table S-4 Display of possible defects
