Allied Telesis AT-S21 - Manual (Page 63)

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4-9
Expect transmit errors to be very small. The switch may receive
a number of bad frames, but the switch drops those and sends
only good frames.
See Table 4-2 for a definition of transmit frames.
To view transmitted statistics per port
1. Select Individual Port Overview from the Transmit
Statistics Graph screen to display a list of ports.
2. Select a port number to view a graph of that port’s transmit
statistics.
Table 4-2 Transmit Ethernet Frames
Frame Type Description
Total good transmits Total frames transmitted by the switch without errors since the last
reset
Broadcasts Frames forwarded by the switch destined for ALL nodes on the
network, excluding multicast frames
Multicasts Frames forwarded by the switch destined for multiple but specific
addresses, excluding broadcast frames
Transmits deferred Frames whose transmission has been deferred by the switch due to
lack of resources; they are not stored in the buffer and eventually
dropped
Single collision Frames from two ports that collided because they were sent at the
same time; considered normal
Multiple collisions The same frames collide more than once; they are expected to be
far less than single collisions and may indicate a problem with the
sending devices
Late collisions Collisions that occur after 64-byte times of the frame had elapsed
Excessive collisions A frequency of frame collisions detected by the port that causes the
interface to fail to transmit frames
Transmit timeouts Number of times the switch has stopped trying to transmit due to
collisions