LARTC - Jun 2004 - what does overlimit parameter mean?

hi, 
can someone tell me what does "overlimit" means with repect to TBF at
the
root when the "show -s qdisc .." is run .
it reports 3 parameters - drops, overlimits and backlog. How are the three
related? is overlimit specified in terms of bytes or packets.
need help urgently
Amita
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