3. Status and Statistics
3-78
May
2003
9000-A2-GB33-20
ATM Performance Statistics (9783, 9788)
Asynchronous Transfer Mode (ATM) statistics are available for Models 9783 and
9788 CSU/DSUs and Routers.
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ATM
The ATM link, Net1-ATM, must be enabled for these statistics to appear.
Table 3-20. ATM Performance Statistics (1 of 2)
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).