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7. Operation and Maintenance
7-38 December 2002 9700-A2-GB20-20
ATM Performance Statistics (9783, 9788)
Access Asynchronous Transfer Mode (ATM) statistics from the Performance
Statistics menu.
Main Menu Status Performance Statistics ATM
ATM link, Net1-ATM, must be enabled for these statistics to appear.
Table 7-17. ATM Performance Statistics
Statistic What It Indicates
AAL5 (ATM Adaption Layer)
Tx PDUs Number of AAL5 Common Part Convergence Sublayer (CPCS)
Protocol Data Units (PDUs) passed to the lower layer for
transmission.
Rx PDUs Number of AAL5 PDUs received and passed to a higher layer.
Tx Octets Number of AAL5 octets (bytes) passed to the lower layer for
transmission.
Rx Octets Number of AAL5 octets (bytes) received and passed to a higher
layer.
Errored Tx PDUs Number of AAL5 PDUs that could not be transmitted due to errors.
Errored Rx PDUs Number of AAL5 CPCS PDUs received that contained errors.
OAM (Operations, Administration, and Maintenance)
Total Tx OAM Cells Number of OAM cells transmitted.
Total Rx OAM Cells Number of OAM cells received.
TC (Transmission Convergence) Sublayer
Total Tx Cells Number of cells transmitted.
Total Rx Cells Number of cells received.
Total Rx Cells
Dropped
Number of cells received and dropped due to errors.
Rx HEC Errors Number of cells received with HEC field errors.
Unknown Rx Cells Number of cells received and discarded during cell header
validation. These include cells with:
Unrecognized VPI/VCI values.
Invalid cell header patterns.
Undefined Payload Type Indicators.
Last Unknown
VPI,VCI
The VPI,VCI of the last cell discarded due to an unrecognized
VPI,VCI. If no such cells have been discarded, None appears.
OCD Events Number of times OCD events have been detected (when seven
consecutive cells with HEC violations are detected).
Cell Delineation
State
Synchronization value (In Sync or Out of Sync) of the last cell
received.