User's Manual

Table Of Contents
232 APCD-LM043-4.0
The CCU maintains a transmit queue for each EUM. The length of this queue is
limited, to keep one EUM from consuming all the resources and impacting other
EUMs. Discards indicate excessive load by one EUM, possibly due to large TCP
windows.
Registration occurs once per EUM and/or CCU boot time. Deregistration may occur if
an EUM is not authorized (a registration/deregistration request pair occurs periodically
while that EUM is powered ON) or if the EUM does not respond to multiple
consecutive polls, such as when it is powered OFF.
Association occurs when there is traffic to send to or from an EUM. Disassociation
occurs if there is no traffic to or from an EUM for a short period of time.
To view the MAC Interface Statistics:
CCU> stats mac
----------------- MAC Interface Statistics --------------------
Rx Data Payloads : 132323
Rx Ctrl Payloads : 5702
Rx Payload Fail Invalid Type : 0
Rx Payload Fail Giant : 0
Null Rx Descriptors : 0
Tx Data Payloads : 138245
Tx Ctrl Payloads : 5702
Tx Payload Fail Invalid Type : 0
Tx Payload Fail Giant : 0
Tx Payload Fail Invalid Desc : 0
Atmel Tx Buffer full on arrival : 0
Command time outs : 0
Command missed IRQs : 0
False Command IRQs : 1766
Command Status Errors : 0
Atmel Fatal Errors : 0
Unused statistic : 0
rxPktsDirected: 2765984
rxPktsBroadcast: 2163
rxPktsNoMatch: 0
rxPktsDuplicate: 733
rxPktsRuntFail: 0
rxPktsLongFail: 0
rxPktsHCRCFail: 151
rxPktsICVFail: 0
rxPktsFCSFail: 23
rxPktsAssocFail: 0
rxPktsIncomplete: 0
rxPayloadsFailFull: 0
rxPayloadsDelivered: 138025
rxPktsEmpty: 2635068
txPkts: 16960762
txPktsEmpty: 16804869
txPayloads: 155893
txPayloadsBCast: 2040
txPayloads1Ok: 131286
txPayloads2Ok: 9423
txPayloads3Ok: 1027
txPayloads4Ok: 133
txPayloadsFailRetry: 27
txPayloadsFailAssocDeleted: 11
txPayloadsFailBadParam: 0
txPayloadsFailVnetInactive: 0
txPayloadsFailAssocFail: 0
txPayloadsFailTimeout: 0