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Functional Description
• Found the medium busy when transmission was first attempted, so had to wait.
CRC errors have no effect upon this statistic.
14.3.2.20.2.12 Carrier Sense Errors (Offset = 60h)
The total number of frames received on the port that had a CPDMA middle of frame (MOF) overrun. MOF
overrun frame is defined to be:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• The carrier sense condition was lost or never asserted when transmitting the frame (the frame is not
retransmitted). This is a transmit only statistic. Carrier Sense is a don’t care for received frames.
Transmit frames with carrier sense errors are sent until completion and are not aborted.
CRC errors have no effect upon this statistic.
14.3.2.20.2.13 Tx Octets (Offset = 64h)
The total number of bytes in all good frames transmitted on the port. A good frame is defined to be:
• Any data or MAC control frame which was destined for any unicast, broadcast or multicast address
• Was any size
• Had no late or excessive collisions, no carrier loss and no underrun.
14.3.2.20.3 Rx- and Tx-Shared Statistics Descriptions
14.3.2.20.3.1 Rx + Tx 64 Octet Frames (Offset = 68h)
The total number of 64-byte frames received and transmitted on the port. Such a frame is defined to be:
• Any data or MAC control frame which was destined for any unicast, broadcast or multicast address
• Did not experience late collisions, excessive collisions, or carrier sense error
• Was exactly 64 bytes long. (If the frame was being transmitted and experienced carrier loss that
resulted in a frame of this size being transmitted, then the frame will be recorded in this statistic).
CRC errors, code/align errors and overruns do not affect the recording of frames in this statistic.
14.3.2.20.3.2 Rx + Tx 65–127 Octet Frames (Offset = 6Ch)
The total number of frames of size 65 to 127 bytes received and transmitted on the port. Such a frame is
defined to be:
• Any data or MAC control frame which was destined for any unicast, broadcast or multicast address
• Did not experience late collisions, excessive collisions, or carrier sense error
• Was 65 to 127 bytes long
CRC errors, code/align errors, underruns and overruns do not affect the recording of frames in this
statistic.
14.3.2.20.3.3 Rx + Tx 128–255 Octet Frames (Offset = 70h)
The total number of frames of size 128 to 255 bytes received and transmitted on the port. Such a frame is
defined to be:
• Any data or MAC control frame which was destined for any unicast, broadcast or multicast address
• Did not experience late collisions, excessive collisions, or carrier sense error
• Was 128 to 255 bytes long
CRC errors, code/align errors, underruns and overruns do not affect the recording of frames in this
statistic.
1217
SPRUH73H–October 2011–Revised April 2013 Ethernet Subsystem
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