User's Manual

APCD-LM043-4.0 209
Notes:
•Apacket is the basic unit of transmission. A packet may or may not contain a payload.
A payload is user data, which may be an Ethernet frame or a logical link layer control
message.
• WEP is not supported in this release.
• The CCU maintains a transmit queue for each EUM. The length of this queue is
limited, to prevent one EUM from consuming all the resources and impacting service
to 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.
ccuRadioMACTxPayloadsAssocFail 44 Counter Number of payloads returned to the host because too
many other EUMs were already
associated.
ccuRadioMACTxPayloadsTimeout 45 Counter Number of payloads returned to the host because of
timeout.
ccuRadioMACTxPayloadQueueTooLong 46 Counter Number of payloads returned to the host because the
transmit queue for the EUM was too long (see note 4).
47 Counter Not used.
ccuRadioMACReplyOrRssiTimeout 48 Counter Number of times that no response was received to a
directed poll.
ccuRadioMACRestarts 49 Counter Number of times that the MAC layer recovered from
an internal error or unexpected event.
ccuRadioMACRegRequests 50 Counter Number of registration requests received (see note 5).
ccuRadioMACRegResponse 51 Counter Number of registration responses transmitted (see
note 5).
ccuRadioMACDeregRequests 52 Counter Number of deregistration requests transmitted (see
note 5).
ccuRadioMACDeregInits 53 Counter Number of times no response was received from an
EUM, after multiple polls (see note 5). This statistic
indicates a poor radio link to one or more EUMs.
ccuRadioMACDisassociationRequests 54 Counter Number of disassociation requests transmitted (see
note 6).
ccuRadioMACDisassociationInits 55 Counter Number of times the CCU has determined than an
EUM should be
disassociated (see note 6).
MIB Name OID
Value
Type
Description