342-86400-498PS
Issue 1.2
April 2012
Page 122
Copyright
GE Multilin Inc. 2010-2012
Jabber
Increments on reception of a frame longer than 1632 bytes and either
a CRC error or an alignment error (or both) is also detected. Also
increments for frames longer than 2032 bytes.
Collisions
Increments on each collision detected on the port. Collisions are
normal events in half-duplex Ethernet LANs (as long as they occur
within the first 64-byte-time periods of a frame transmission). On such
collision, the transmitter waits a random number of 512-bit-time periods
before it attempts retransmission of the frame.
Note:
For a port in full-duplex mode, this counter is disabled.
Late Collisions
Increments on each late collision detected on the port.
Late collision is a collision that occurred after the first 64 bytes of a
frame had been transmitted. No retransmission is performed upon its
detection. Occurrence of late collisions is considered to be a serious
error, often caused by improper LAN configuration (e.g. if long cables
are used).
Note:
For a port in full-duplex mode, this counter is disabled.
Excessive Collisions
Increments on each “excessive collision” event registered on the port.
An ”excessive collisions” event is registered after 16 unsuccessful
retransmissions of the same frame (e.g. due to a busy LAN) in which
case the frame is discarded.
Note:
For a port in full-duplex mode, this counter is disabled.
Note:
Unless the network is very busy, “excessive collisions” events
should not happen.
Input Frame Statistics
Frames
– Total
Indicates the total number of good frames received on the port.
Frames
– Broadcast
Indicates the number of good broadcast frames received on the port.