Re: PMD discussion
Boaz,
The "10GE WAN PHY Overview" presented by Mr. Paul Bottorff in Ottawa,
http://grouper.ieee.org/groups/802/3/ae/public/may00/thirion_1_0500.pdf,
illustrates a WAN PHY which may utilize up to three different encodings: 8B/10B
for XAUI, 64B/66B for the PCS, and SUPI for the PMD interface. All this just to
bridge Ethernet to SONET at layer 1. The complexity of this WDM wan PHY
frightens me, especially in the context of a "UniPHY" (i.e. same PHY for LAN and
WAN). At the same meeting, I illustrated the same functionality without the
requirement of a WAN PHY:
http://grouper.ieee.org/groups/802/3/ae/public/may00/taborek_3_0500.pdf. The
latter proposal simply shifts the WIS to the SONET side, still at layer 1.
Best Regards,
Rich
--
Boaz Shahar wrote:
>
> Hi,
> The 4-lane code for WDM is 8b/10b. However, what happens in the case of WAN
> PHY? Is there any proposal for line code (Over the Fiber) for WDM WAN PHY?
>
> > -----Original Message-----
> > From: Rich Taborek [mailto:rtaborek@xxxxxxxxxxxxx]
> > Sent: Monday, May 29, 2000 7:15 AM
> > To: HSSG
> > Subject: Re: PMD discussion
> >
> > Joel,
> >
> > There are no complete 4-lane serial proposals for WDM on the
> > table which use a transmission code other then 8B/10B. The
> > 8B/10B 4-lane serial proposals have been essentially stable
> > for more than 6 months now. It's getting darn close to July,
> > any other candidate transmission codes for WWDM need to get
> > aired very soon.
> >
> > Best Regards,
> > Rich
> >
> > --
> >
> > Joel Goergen wrote:
> > >
> > > Walter,
> > >
> > > I like the second better, but for clarity, I have a
> > > question .... for the serial solution, my understanding
> > > is the thought is to use 64b66b on the fiber. What is
> > > the general thought for wdm? Is it just 8b10b or is the
> > > thinking in general that the line interface is 64b66b?
> > >
> > > Take care
> > > Joel
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Richard Taborek Sr. Phone: 408-845-6102
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