Enterasys IRM2, User Manual

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Statistics
3-4 Statistics
Collisions
Transmit Displays the number of transmit collisions
detected by the device, board, or port. Transmit
collisions are those the IRM2 detects while
transmitting a packet, which means the IRM2
has transmitted one of the colliding packets.
Receive Displays the number of receive collisions
detected by the device, board, or port. Receive
collisions are those detected by the IRM2 while it
is receiving a transmission.
Hard Errors
OOW Collisions Displays the number of collisions out of the
standard collision window (51.2 µs) experienced
by the device, board, or port. Out-of-window
collisions typically indicate a network design
flaw.
Giants Displays the number of giant packets that the
device, board, or port has received from the
network. A giant packet exceeds the maximum
Ethernet frame size of 1518 bytes (excluding the
preamble).
Soft Errors
Alignment Errors Displays the total number of misaligned packets
received by the device, board, or port. A
misaligned packet is one that contains a
non-integral number of bytes (that is, any unit of
bits less than a byte). Alignment errors are also
known as framing errors.
CRC Errors Displays the total number of packets with CRC
(Cyclical Redundancy Check) errors that the
device, board, or port has received from the
network. CRC errors occur when packets are
somehow damaged in transit.
Runts Displays the number of runt packets that the
device, board, or port has received from the
network. A runt packet is one that is less than the
minimum Ethernet frame size of 64 bytes.
Using the Total and Delta Radio Buttons
By using the Total and Delta radio buttons located at the bottom of the Statistics
windows, you can choose whether to view the total statistics count (Total) or the
statistics count for the last polling interval (Delta).