Sun Microsystems 4000 14describes the transmit and receive MAC counters, 14TX and RX MAC Counters

TABLE 3-14describes the transmit and receive MAC counters.

TABLE 3-14TX and RX MAC Counters

Parameter	Description	Stable or Unstable
tx-collisions	16-bit loadable counter increments for	Stable
	every frame transmission attempt that
	resulted in a collision.
tx-first-collisions	16-bit loadable counter increments for	Unstable
	every frame transmission that
	experienced a collision on the first
	attempt, but was successfully
	transmitted on the second attempt.
tx-excessive-collisions	16-bit loadable counter increments for	Unstable
	every frame transmission that has
	exceeded the Attempts Limit.
tx-late-collisions	16-bit loadable counter increments for	Unstable
	every frame transmission that has
	experienced a collision. It indicates the
	number of frames that the TxMAC has
	dropped due to collisions that occurred
	after it has transmitted at least the
	Minimum Frame Size number of bytes.
	Usually this is an indication that there
	is at least one station on the network
	that violates the maximum allowed
	span of the network.
tx-defer-timer	16-bit loadable timer increments when	Unstable
	the TxMAC is deferring to traffic on the
	network while it is attempting to
	transmit a frame. The time base for the
	timer is the media byte clock divided by
	256.
tx-peak-attempts	8-bit register indicates the highest	Unstable
	number of consecutive collisions per
	successfully transmitted frame, that
	have occurred since this register was
	last read. The maximum value that this
	register can attain is 255. A maskable
	interrupt is generated to the software if
	the number of consecutive collisions
	per successfully transmitted frame
	exceeds 255. This register will be
	automatically cleared at 0 after it is
	read.

Chapter 3 Configuring Driver Parameters 45