Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

Re: [EFM] flow control in 802.3





To the purists among you:

I wrote in the last message:

Ben Brown wrote:
> 
> the 10GE MAC 

I should have said:

> the MAC operating at 10 Gbps

since there is only one 802.3 MAC!

Regards,
Ben

Ben Brown wrote:
> 
> Marc,
> 
> In 10GE, we're adding a mode to the MAC that increases the IPG
> based on the length of the preceding packet to lower the overall
> data rate - ifsStretchMode. It is currently only applicable to
> the 10GE MAC when connected to the medium via a WAN PHY but I
> don't believe there is anything that would not allow this to be
> extended for other purposes (other than a vote of less than 75%
> that is :)
> 
> Regards,
> Ben Brown
> 
> MARC KIMPE wrote:
> >
> > All,
> >
> > Is there a way to transmit flow control information across an MII interface from the PHY direction to the MAC ? If yes could someone point me to the pertaining clause of 802.3 ?
> >
> > In other words, let's assume that a PHY for some reason or other can only transmit at 3Mbps while information to that PHY flows at 10Mbps. How can the PHY tell the MAC to stop sending ? I saw some presentations related to 10 Gigabit Ethernet that proposed various mechanisms but I do not know if anything was adopted.
> >
> > Any help would be appreciated.
> >
> > Thanks,
> > Marc Kimpe
> > Adtran
> 
> --
> -----------------------------------------
> 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
-----------------------------------------