Enterasys Networks IRM2 manual Using the Total and Delta Radio Buttons, Collisions, Hard Errors

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).

3-4 Statistics