Re: PMD discussion
[Date: 06/05/2000 From Seto]
Roy and Kamran,
Right or wrong, it has been my understanding the WWDM uses 8b10bx4ch coding.
Serial LAN PHY uses 64B66B coding. WWDM is a different PHY.
It is also my understanding that WWDM LAN PHY, Serial LAN PHY and Serial WAN
PHY are UniPHYs in a way it can share the same XGMII and the optional XAUI
interface. Before WIS is introduced, LAN PHY and WAN PHY could not share
XAUI or XGMII because WAN PHY needed frame length information to encode a
frame.
To all, please correct me if I'm wrong.
Sincerely,
Seto
> Roy,
>
> I have the same concern.
> CWDM uses a different code (8b/10b) than serial (64b/66b), the LAN-PHY and
> WAN-PHY
> have different denominations representing different 10GE PHYs (as per May
> meeting)
> resulting in 10 different PHYs LAN and WAN together!!
>
> What is UniPHY exactly?? What is it unifying anyway?
>
> Why are we forcing on the WAN-PHY a code that is bandwidth inefficient and
> incompatible
> with the SONET world?
>
> Kamran
>
>
>
>
> Roy Bynum wrote:
> >
> > Rich,
> >
> > Now I am confused. It was my understanding that the LAN only PHY would
be using 64b/66b, just like what is being forced on the WAN
> > compatible PHY. If so, then it was my understanding that the parallel/
CWDM PMD would also be 64b/66b.
> >
> > Thank you,
> > Roy Bynum
> >
> > ----- Original Message -----
> > From: "Rich Taborek" <rtaborek@xxxxxxxxxxxxx>
> > To: "HSSG" <stds-802-3-hssg@xxxxxxxx>
> > Sent: Saturday, June 03, 2000 2:35 AM
> > Subject: Re: PMD discussion
> >
> > >
> > > Ed,
> > >
> > > Done! I completely agree to drop this tangent and focus on PMD issues.
> > >
> > > Best Regards,
> > > Rich
> > >
> > > --
> > >
> > > NetWorthTK@xxxxxxx wrote:
> > > >
> > > > Rich:
> > > >
> > > > I believe you misunderstood my mail to conclude your comments too
quickly.
> > > >
> > > > I never mentioned that I like the 12.5 Gbps 8B/10B coding to be
replaced by
> > > > 10.3125 Gbps 64b/66b.
> > > >
> > > > We are discussing serial vs parallel issues.
> > > >
> > > > We are too much involved in resolving PMD issues right now, and I
believe no
> > > > one is interested in bring the coding scheme back to reflector at
this moment.
> > > >
> > > > Please do not intiate this one. let us focuse on PMD issues.
> > > >
> > > > Regards,
> > > >
> > > > Ed Chang
> > >
> > > -------------------------------------------------------
> > > Richard Taborek Sr. Phone: 408-845-6102
> > > Chief Technology Officer Cell: 408-832-3957
> > > nSerial Corporation Fax: 408-845-6114
> > > 2500-5 Augustine Dr. mailto:rtaborek@xxxxxxxxxxx
> > > Santa Clara, CA 95054 http://www.nSerial.com
>