User's Manual Part 2

300 APCD-LM043-8.0 (DRAFT C)
Appendix J: Operating Statistics
Notes:
•A
packet 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.
20k Number of payloads acknowledged after the second
transmission.
30k Number of payloads acknowledged after the third
transmission.
40k Number of payloads acknowledged after the fourth
transmission.
Fail Retry Number of payloads that failed to transmit due to the
retry limit.
Fail Q Too Long Number of payloads returned to the host because the
transmit queue for the EUM was too long.
Fail Timeout Number of payloads returned to the host because of
timeout.
Received and Expected Responses
HCRC Error Number of packets received with corrupted headers,
in response to polling the EUM.
Directed Number of packets received with correct headers, in
response to polling the EUM.
Random Access Number of packets received with correct headers, in
response to a random access polling. These are
considered successful random accesses.
No Reply Received Number of times the EUM did not respond to a
directed poll.
No Payload Number of packets received that are directed to this
station, from the EUM, but that did not contain a
payload.
Received Payloads
FCS Error Number of packets received with a Frame Check
Sequence failure (payload corrupted).
Duplicate Number of duplicate payloads (see note 1) received
and discarded. Indicates that a MAC layer
acknowledgement was lost.
Delivered Number of payloads received correctly.
txPayloads Number of payloads transmitted.
Statistic Description