[SI-LIST] Re: PHY PCS
- From: "Edi Fraiman" <Edi.Fraiman@xxxxxxxxxxxxx>
- To: "steve weir" <weirsi@xxxxxxxxxx>, <Ravindra.Johari@xxxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 2 Feb 2006 11:44:11 +0200
Hi,
The code was described in 1983 by Al Widmer and Peter Franaszek in the
IBM Journal of Research and Development.
Edi
> -----Original Message-----
> From: steve weir [mailto:weirsi@xxxxxxxxxx]
> Sent: Thursday, February 02, 2006 11:40 AM
> To: Edi Fraiman; Ravindra.Johari@xxxxxxxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
> Subject: Re: [SI-LIST] Re: PHY PCS
>=20
> Edi, I believe the original IBM patent ran a couple of years ago.
There
> is
> a later patent that may still be live on a table based implementation.
In
> addition to the attributes you list, 8b10b has a limited run-length
that
> results in a fairly narrow bandwidth of 8:1 worst case.
>=20
> Steve.
> At 11:20 AM 2/2/2006 +0200, Edi Fraiman wrote:
> >Hi,
> >
> >
> >8b/10b encoding is IBM patented encoding method.
> >
> >The benefits are:
> >
> >
> >
> >1. DC balance
> >
> >2. Bit synchronization is more easily
> >
> >3. Error detection is improved
> >
> >4. Control character can be distinguished from data characters
> >
> >
> >
> >Edi
> >
> >
> >
> > > -----Original Message-----
> >
> > > From: si-list-bounce@xxxxxxxxxxxxx
> >[mailto:si-list-bounce@xxxxxxxxxxxxx]
> >
> > > On Behalf Of Ravindra Johari
> >
> > > Sent: Thursday, February 02, 2006 11:09 AM
> >
> > > To: si-list@xxxxxxxxxxxxx
> >
> > > Subject: [SI-LIST] PHY PCS
> >
> > >
> >
> > > Hi Gurus,
> >
> > >
> >
> > >
> >
> > > Have a very generic question about Physical Layer Device.
> >
> > >
> >
> > > In the PCS i.e the Physical coding sublayer of the PHY Device why
is
> >the
> >
> > > 8b/10b encoding/decoding required.
> >
> > >
> >
> > > Why not the serial signals received by the MDI directly interfaced
> >with
> >
> > > the
> >
> > > MAC without encoding/decoding??
> >
> > >
> >
> > >
> >
> > >
> >
> > > Apologies, if this is not related to Signal Integrity...
> >
> > >
> >
> > >
> >
> > >
> >
> > > Thanks and Regards,
> >
> > >
> >
> > > Ravi..
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
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