Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 922)

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The Transmit Errors field displays the following:
Network Graph
Interfaces
The Network Graph displays statistics the Access Point continuously collects for its interfaces. Even
when the interface statistics graph is closed, data is still collected. Display the interface statistics
graph periodically for assessing the latest interface information. Up to three different stats can be
selected and displayed within the graph.
To view a detailed graph for an interface, select an interface and drop it on to the graph. The graph
displays Port Statistics as the Y-axis and the Polling Interval as the X-axis. Use the Polling Interval
from-down menu to define the increment data is displayed on the graph.
To view the Interface Statistics graph:
1. Select the Statistics menu from the Web UI.
2. Select System from the navigation pane (on the left-hand side of the screen). Expand a RF
Domain, select a controller or service platform, and select one of its connected Access Points.
3. Select Interfaces .
4. Select Network Graph .
Tx Errors Displays the number of packets with errors transmitted on the interface.
Tx Dropped Displays the number of transmitted packets dropped from the interface.
Tx Aborted Errors Displays the number of packets aborted on the interface because a
clear-to-send request was not detected.
Tx Carrier Errors Displays the number of carrier errors on the interface. This generally indicates bad Ethernet
hardware or bad cabling.
Tx FIFO Errors Displays the number of FIFO errors transmitted at the interface. First-in First-Out queueing is an
algorithm that involves the buffering and forwarding of packets in the order of arrival. FIFO uses no
priority. There is only one queue, and all packets are treated equally. An increase in the number of
FIFO errors indicates a probable hardware malfunction.
Tx Heartbeat Errors Displays the number of heartbeat errors. This generally indicates a software crash, or packets
stuck in an endless loop.
Tx Window Errors 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) 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 acknowledgment, it constitutes a window
error.
Refresh Select Refresh to update the statistics counters to their latest value.