342-86400-498PS
Issue 1.2
April 2012
Page 121
Copyright
GE Multilin Inc. 2010-2012
Port
Allows the user to select the port for which the information will be displayed.
Note that the labels for those paddleboard ports that are available but presently
disabled are grayed out although their statistics can be viewed.
Errored Frame Counts
Long Frames
Increments on reception of a frame longer than 1632 bytes, and less
than 2033 bytes (longer frames are counted as “jabber”). These
frames are discarded.
Short Frames
Increments on reception of a frame shorter than 64 bytes with valid
FCS (CRC) check. (Compare with
Fragments
counter definition
below.)
CRC Errors
Increments on detection of Frame Check Sequence (CRC) errors.
FCS is carried in the last 4 bytes of the frame. FCS is used for a
"validity" check on each Ethernet frame. If the frame has been
corrupted by the physical network (or was sent out with a bad FCS),
the FCS field given will not match the one calculated by the receiver.
FCS errors are also called "CRC errors" or "Checksum errors" (the
FCS code implemented is CRC32).
Fragments
Increments on reception of a frame shorter than 64 bytes with an FCS
(CRC) error or an alignment error (see Align Errors below).
Note
: It is entirely normal for fragments counter to increment for a port
in the half-
duplex mode because “runts” (interrupted frames due to
collisions) are counted.
Alignment Errors
Increments when a received Ethernet frame is not “octet-aligned” i.e.
its total number of bits is not a multiple of 8. Align(ment) errors are
also called "Framing Errors" by other vendors and books.