3Com 1000 - Manual (Page 111)

Port Error Analysis 6-7
Jabbers The total number of packets received that
were longer than 8K octets (excluding framing bits,
but including FCS octets).
CLEAR SCREEN COUNTERS Select this button to
set all counters shown on the screen to zero. It is
useful for trend analysis if you wish to see changes
in counters over a short period of time. This button
does not clear the counters on the device or affect
counters at the network management workstation.