Motorola AP-6511 Reference Manual page 400

Motorola Solutions AP-6511 Access Point System Reference Guide
MAC Receive
Error
Bad CRC
The
Rx Frame Errors
Rx Length Errors
Rx FIFO Errors
Rx Missed Errors
Rx Over Errors
The
Tx Errors
Tx Dropped
Tx Aborted
Errors
Tx Carrier Errors
Tx FIFO Errors
Tx Heartbeat
Errors
Tx Window
Errors
13-40
Displays the number of received packets failed because of an internal MAC
sublayer that is not late collision, excessive collisions, or carrier sense error.
Displays the CRC error. The Cyclical Redundancy Check (CRC) is the 4 byte
field at the end of every frame. The receiving station uses it to interpret if the
frame is valid. If the CRC value computed by the interface does not match the
value at the end of the frame, it's considered a bad CRC.
Receive Errors filed displays the following information:
Displays the number of frame errors received at the interface. A frame error
occurs when a byte of data is received but not in the format expected.
Displays the number of length errors received at the interface. Length errors
are generated when the received frame length was less than or exceeded the
Ethernet standard.
Displays the number of FIFO errors received at the interface. First-in First-out
queueing is an algorithm that involves buffering and forwarding of packets in
the order of arrival. FIFO entails no priority for traffic. There is only one queue,
and all packets are treated equally.
Displays the number of missed packets. Packets are missed when the
hardware received FIFO has insufficient space to store the incoming packet.
Displays the number of overflow errors. An overflow occurs when packet size
exceeds the allocated buffer size.
Transmit Errors field displays the following:
Displays the number of packets with errors transmitted on the interface.
Displays the number of transmitted packets dropped from the interface.
Displays the number of packets aborted on the interface because a
clear-to-send request was not detected.
Displays the number of carrier errors on the interface. This generally indicates
bad Ethernet hardware or cabling.
Displays the number of FIFO errors received at the interface. First-in first-out
queueing is an algorithm that involves buffering and forwarding packets in
the order of arrival. FIFO entails no priority for traffic. There is only one queue,
and all packets are treated equally.
Displays the number of heartbeat errors. This generally indicates a software
crash or packets stuck in an endless loop.
Displays the number of window errors transmitted. TCP uses a sliding
window flow control protocol. In each TCP segment, the receiver specifies the
amount of additional received data (in bytes) in the receive window field the
receiver is willing to buffer for the connection. The sending host can send only
up to that amount. If the sending host transmits more data before receiving
an acknowledgement from the receiving host, it constitutes a window error.