Re: Interface reality check
Rich,
You are making statements that are not based in fact. The 64B/66B proposals
are based on the continuance of the LAN only PHY block coding schemes. Rich
Walker has stated that when he made the 64B/66B he did not take into account
the possibility of the absence of 8B10B Hari. The 8B10B block coding keeps
getting brought back over and over again under different names. The only
reason that this would happen is that it becomes obvious that the group as a
whole did not support it in each of its previous iterations. This has not
happened to the WAN compatible PHY proposals that do not use block coding.
Thank you,
Roy Bynum
----- Original Message -----
From: Rich Taborek <rtaborek@earthlink.net>
To: HSSG <stds-802-3-hssg@ieee.org>
Sent: Thursday, April 06, 2000 9:54 PM
Subject: Re: Interface reality check
>
> Roy,
>
> Absolutely not.
>
> It should be clear that 64B/66B is a single lane serial transmission code
which
> is embodied in multiple strongly endorsed IEEE P802.3ea proposals. These
> include:
>
> a) LAN Serial PHY:
> http://grouper.ieee.org/groups/802/3/ae/public/mar00/bhatt_1_0300.pdf
> b) UniPHY:
> http://grouper.ieee.org/groups/802/3/ae/public/mar00/frazier_1_0300.pdf
>
> Note that the UniPHY covers all WAN application spaces, whether SONET/SDH
or
> native Ethernet.
>
> Best Regards,
> Rich
>
> --
>
> Roy Bynum wrote:
> >
> > Rich,
> >
> > Are you referring to the LAN only PHY?
> >
> > Thank you,
> > Roy Bynum
> >
> > --
> > >
> > > Rick,
> > >
> > > Agreed. I should have qualified as "pure scrambled" code. 64B/66B
> > > certainly does not fit into this category. This is one of the clear
> > > benefits of 3.125% overhead.
> > >
> > > Best Regards,
> > > Rich
> > >
> > > --
> > >
> > > Rick Walker wrote:
> > > >
> > > > > Agreed. Cool! 8B/10B plug: 8B/10B supports the detection of poor
> > > > > signal quality on a link regardless of the information being
> > > > > transported. In fact simple receiver circuitry can determine the
BER
> > > > > at the decoder in real time. Try that with a scrambled code ;_)
> > > >
> > > > 64b/66b also supports the measurement of bit error rate by looking
at
> > > > master transition violations regardless of the information being
> > > > transmitted.
> > > >
> > > > You are right, however, in that 64b/66b is not a pure scrambled
code,
> > > > but one augmented by periodic frame sync bits.
> > > >
> > > > Best regards,
> > > > --
> > > > Rick Walker
>
> -------------------------------------------------------
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> Chief Technology Officer Cell: 408-832-3957
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>
>