User's Manual

Operation and Maintenance
6-32
9783-A2-GB20-00
July 2000
ATM Performance Statistics
The following statistics appear when Frame Relay is selected from the
Performance Statistics menu.
Main Menu → Status → Performance Statistics → ATM
All counts continue to increment until the maximum value is reached (2
32
–2),
then the count starts over.
Table 6-15. ATM Performance Statistics (1 of 2)
Statistic
What It Indicates
AAL5
Tx PDUs The number of ATM Adaption Layer (AAL5) Common Part
Convergence Sublayer (CPCS) Protocol Data Units (PDUs)
passed to the lower layer for transmission.
Rx PDUs The number of received AAL5 CPCS PDUs passed to a higher
layer.
Tx Octets The number of AAL5 CPCS octets (bytes) passed to the lower
layer for transmission.
Rx Octets The number of received AAL5 CPCS octets (bytes) passed to
a higher layer.
Errored Tx PDUs The number of AAL5 CPCS PDUs that could not be
transmitted due to errors.
Errored Rx PDUs The number of received AAL5 CPCS PDUs that contained
errors.
Discarded Tx PDUs The number of AAL5 CPCS PDUs received for transmission
that were discarded.
Discarded Rx PDUs The number of received AAL5 CPCS PDUs discarded.
TC Sublayer
Total Tx Cells The number of cells transmitted.
Total Rx Cells The number of cells received.
Total Rx Cells
Dropped
The number of received cells dropped due to errors.
Rx HEC Errors The number of cells received whose HEC fields were in error.
Unknown Rx Cells The number of received cells discarded during cell header
validation. These include:
H Cells with unrecognized VPI/VCI values
H Cells with invalid cell header patterns
H Cells with 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
in this field.