Functional Description
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14.3.2.20.2.6 Single Collision Tx Frames (Offset = 4Ch)
The total number of frames transmitted on the port that experienced exactly one collision. Such a frame:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• Had no carrier loss and no underrun
• Experienced one collision before successful transmission. The collision was not late.
CRC errors have no effect upon this statistic.
14.3.2.20.2.7 Multiple Collision Tx Frames (Offset = 50h)
The total number of frames transmitted on the port that experienced multiple collisions. Such a frame:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• Had no carrier loss and no underrun
• Experienced 2 to 15 collisions before being successfully transmitted. None of the collisions were late.
CRC errors have no effect upon this statistic.
14.3.2.20.2.8 Excessive Collisions (Offset = 54h)
The total number of frames for which transmission was abandoned due to excessive collisions. Such a
frame:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• Had no carrier loss and no underrun
• Experienced 16 collisions before abandoning all attempts at transmitting the frame. None of the
collisions were late.
CRC errors have no effect upon this statistic.
14.3.2.20.2.9 Late Collisions (Offset = 58h)
The total number of frames on the port for which transmission was abandoned because they experienced
a late collision. Such a frame:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• Experienced a collision later than 512 bit-times into the transmission. There may have been up to 15
previous (non-late) collisions which had previously required the transmission to be re-attempted. The
Late Collisions statistic dominates over the single, multiple and excessive Collisions statistics - if a late
collision occurs the frame will not be counted in any of these other three statistics.
CRC errors have no effect upon this statistic.
14.3.2.20.2.10 Tx Underrun (Offset = 5Ch)
There should be no transmitted frames that experience underrun.
14.3.2.20.2.11 Deferred Tx Frames (Offset = 44h)
The total number of frames transmitted on the port that first experienced deferment. Such a frame:
• Was any data or MAC control frame destined for any unicast, broadcast or multicast address
• Was any size
• Had no carrier loss and no underrun
• Experienced no collisions before being successfully transmitted
1216
Ethernet Subsystem SPRUH73H–October 2011–Revised April 2013
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