RE: PCS Management Counters

[Vivek Mishra <vivek@xxxxxxxxxxxxxxxx>]

Title: RE: PCS Management Counters

Ben,

Incrementing the ERRORED FRAME COUNT when the
state machine enters the RX_E state
"only" for the first time would give the
count of the number of packets thrown
away because of ERROR column being there.

Don't you think so this will be a better
statistic to have about the quality of the
link - the number of packets that had
to be thrown away - rather than just a count
which over a period of time is just a number?

cheers,
vivek

-----Original Message-----
From: Ben Brown [mailto:bbrown@xxxxxxxx]
Sent: Monday, January 08, 2001 7:49 PM
To: 802.3ae
Subject: 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@xxxxxxxx]
> 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@xxxxxxxx
> -----------------------------------------

--
-----------------------------------------
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@xxxxxxxx
-----------------------------------------