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RE: RUNT Packets


I do not understand your point. At lower speeds, there are four possible
causes of a runt - 

A noise hit causes a short event on a segment which arrives at a repeater,
since ther repeater never transmits less than a minimum size fragment it
sends a runt.

A collision fragment

A noise hit that causes an end delimiter to be detected in error. 

Someone transmitted a frame smaller than the minimum frame size. (Is this
the protocol error you referred to?)

Therefore, at the lower speeds, runts can be caused by noise, the normal
operation of CSMA/CD or transmission shorter than the minimum. For full
duplex they are only caused by noise or transmission shorter than minimum.


-----Original Message-----
From: Grow, Bob [mailto:bob.grow@xxxxxxxxx]
Sent: Tuesday, November 14, 2000 10:52 AM
To: 'James Colin'; stds-802-3-hssg@xxxxxxxx
Subject: RE: RUNT Packets

A minimum frame size was established at 10 Mb/s to assure that collisions
were detected.  Shorter "runt" frames are an error and are commonly counted
and monitored in management databases.  In the desire to maintain
consistency over all speeds of ethernet, we should attempt to preserve
similar error properties.  If the RS turns an error created by transmission
noise into a protocol error (e.g., runt frame) we are violating the
objective to make things look the same.

--Bob Grow

-----Original Message-----
From: James Colin [mailto:james_colin_j@xxxxxxxxx]
Sent: Tuesday, November 14, 2000 2:50 AM
To: stds-802-3-hssg@xxxxxxxx
Subject: RUNT Packets

Louis, Bob
Can you explain the term "runt packets"?
Thank you,

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