Matt,
Since EFMCu uses the half-duplex mode of the MAC to do MAC-PHY rate
matching, PAUSE frames cannot be used. The current text of the draft
(D2.1) states:
"Both EFM Copper port PHYs are only defined for full duplex operation
(notwithstanding the definition of PHY-MAC Rate Matching (see 61.2.1)
which requires that the MAC operates in half-duplex mode for the purposes
of flow control). PAUSE frame transmission via EFM Copper PHYs is
therefore precluded, since the requirements of 31B.1 (see Clause 31)
restrict the transmission of PAUSE frames to DTEs configured to the full
duplex mode of operation."
Regards,
Michael Beck
Editor, EFM/Copper
Matt Squire wrote:
>
> > Dan,
> >
> > Here are some arguments for not supporting the EtherLike-MIB
> > (just for the purpose of argument):
> >
> > Let's look at some of the control groups in EtherLike-MIB (rfc-3635):
> > - dot3PauseTable - The EFMCu interfaces do not support Pause
> > frames so this
> > may be omitted.
>
> I don't know this is true. I know that it is discussed that PAUSE can slow down or interfere with OAM operation on Ethernet links. But nothing really stops one from implementing PAUSE if they wanted to.
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