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Re: RUNT Packets


Should we say Runt is a carrier event comes to the receive port with
qualified preamble and SFD, and it ends as an undersized packet.

If a carrier event comes to the receive without the valid preamble
and SFD, then it's just a carrier event.



"THALER,PAT (A-Roseville,ex1)" wrote:

> Bob,
> 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.
> Pat
> -----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,
> James
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