Rx_Errors = rx error count

Bad frame was marked as error by PHY.

Rx_CRC_Errors +
Rx_Length_Errors -
Rx_Align_Errors

This error is only valid in 10/100M mode.

Rx_Dropped or
Rx_No_Buffer_Count

Running out of buffer space.

Rx_Missed_Errors

Equals Rx_FIFO_Errors + CEXTERR (Carrier Extension Error Count). Only valid in 1000M mode, whichis marked by PHY.

Tx_Errors = Tx_Aborted_Errors

ECOL (Excessive Collisions Count). Only valid in half-duplex mode.

Tx_Window_Errors

LATECOL (Late Collisions Count). Late collisions are collisions that occur after 64-byte time into the transmission of the packet while working in 10 to100Mb/s data rate and 512-byte timeinto the transmission of the packet while working in the 1000Mb/s data rate. This register only increments if transmits are enabled and the device is in half-duplex mode.

Rx_Dropped

See Rx_Errors.

Tx_Dropped

Not defined.

Collisions

Total number of collisions experienced by the transmitter. Valid in half-duplex mode.

Rx_Length_Errors

Transmission length error.

Rx_Over_Errors

Not defined.

Rx_CRC_Errors

Frame CRC error.

Rx_Frame_Errors

Same as Rx_Align_Errors. This error is only valid in 10/100M mode.

Rx_FIFO_Errors

Same as Rx_Missed_Errors - a missed packet count.

Tx_Aborted_Errors

See Tx_Errors.

Tx_Carrier_Errors

The PHY should assert the internal carrier sense signal during every transmission. Failure to do so may indicate that the link has failed or the PHY has an incorrect link configuration. This register only increments if transmits are enabled. This register is not valid in internal SerDes 1 mode (TBI mode for the 82544GC/EI) and is only valid when the Ethernet controller is operating at full duplex.

Tx_FIFO_Errors

Not defined.

Tx_Heartbeat_Errors

Not defined.

Tx_Window_Errors

See LATECOL.

Tx_Single_Collision_Frames

Counts the number of times that a successfully transmitted packet encountered a single collision. The value only increments if transmits are enabled and the Ethernet controller is in half-duplex mode.

Tx_Multiple_Collision_Frames

A Multiple Collision Count which counts the number of times that a transmit encountered more than one collision but less than 16. The value only increments if transmits are enabled and the Ethernet controller is in half-duplex mode.

Tx_Deferred

Counts defer events. A defer event occurs when the transmitter cannot immediately send a packet due to the medium being busy because another device is transmitting, the IPG timer has not expired, half-duplex deferral events are occurring, XOFF frames are being received, or the link is not up. This register only increments if transmits are enabled. This counter does not increment for streaming transmits that are deferred due to TX IPG.

Rx_Frame_Too_Longs

The Rx frame is over size.

Rx_Frame_Too_Shorts

The Rx frame is too short.

Rx_Align_Errors

This error is only valid in 10/100M mode.

Symbol Error Count

Counts the number of symbol errors between reads - SYMERRS. The count increases for every bad symbol received, whether or not a packet is currently being received and whether or not the link is up. This register only increments in internal SerDes mode.