Re: Gearbox reality check
[Date: 06/19/2000 From Seto]
Rich,
I don't understand.
When WAN PHY uses 4-lane WDM PMA (SUPI), it still uses SONET framer (WIS)
before facing to the 4-lane interface. Are you saying that WIS would be
inevitably integrated with 64B66B PCS?
Seto
>
> Ooops!
>
> I should have written 66:4 instead of 66:6 to cover the case of 66-bit frames
> going across a 4-lane WDM PMA interface for the WAN PHY. Sorry 'bout that!
>
> Best Regards,
> Rich
>
> --
>
> Rich Taborek wrote:
> >
> > Roy,
> >
> > The purpose of the "gearbox" you mention is simple and straightforward.
However,
> > it should be noted that the gearbox is implementation specific to the PMA
> > service interface. The 66:16 gearbox converts 66-bit sub-frames and slices
them
> > up into 16-bit chunks for transport over 16-bit interfaces such as the XBI
> > proposed as a PMA service interface:
> > http://grouper.ieee.org/groups/802/3/ae/public/may00/robinson_1_0500.pdf
> >
> > Other 10 GbE PHY implementations may utilize a 66:6 gearbox or no gearbox
at all
> > in the case that the PMA service interface is a 1-bit serial interface.
>
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> Richard Taborek Sr. Phone: 408-845-6102
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>