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Re: PCS Management Counters





Vivek,

During the discussion of adding these counters in the Clause 49
breakout session in Tampa, it was suggested that these counters
could be used to give a user a feel for the quality of the link.

It isn't possible to correlate the value in errored_frame_count
with the number of packets lost on a link or the number of bad
packets counted by a MAC. However it is often useful to have a
link quality measure such as this counter available for diagnostic
purposes.

Enjoy,
Ben


> Vivek Mishra wrote:
> 
> Ben,
> Thanks for your reply.
> 
> Where will these counters be used?
> I mean do these counters give some kind of
> count which tells the number of packets that
> will be thrown away by the MAC because of
> "ERROR" column?
> 
> If the counter gives the number of ERROR columns
> inserted by PHY how can somebody use
> it for statistics?
> 
> vivek
> 
> -----Original Message-----
> From: Ben Brown [mailto:bbrown@amcc.com]
> Sent: Friday, January 05, 2001 5:38 PM
> To: 802.3ae
> Subject: Re: PCS Management Counters
> 
> Vivek,
> 
> Since, according to the state machine conventions and figure 49-14,
> the state is actually re-entered on every clock edge, the counter
> would be incremented twice (in your case) or once for every clock
> cycle spent in that state (in general).
> 
> Ben
> 
> > Vivek Mishra wrote:
> >
> > Hi all,
> >
> > Just a small clarification.....
> >
> > The counter "ERRORED FRAME COUNTER" in PCS management counters is
> > said to be incrementing when the "RX_E" state is entered.
> >
> > Lets say that the state machine is in "RX_E" state for two clocks.
> >
> > Will the counter increment by two or will it increment
> > by one since the state was entered only once?
> >
> > Regards,
> > Vivek
> 
> --
> -----------------------------------------
> Benjamin Brown
> AMCC
> 2 Commerce Park West
> Suite 104
> Bedford NH 03110
> 603-641-9837 - Work
> 603-491-0296 - Cell
> 603-626-7455 - Fax
> 603-798-4115 - Home Office
> bbrown@amcc.com
> -----------------------------------------


-- 
-----------------------------------------
Benjamin Brown
AMCC
2 Commerce Park West
Suite 104 
Bedford NH 03110
603-641-9837 - Work
603-491-0296 - Cell
603-626-7455 - Fax
603-798-4115 - Home Office
bbrown@amcc.com
-----------------------------------------