[SI-LIST] Re: PHY PCS
- From: "Edi Fraiman" <Edi.Fraiman@xxxxxxxxxxxxx>
- To: <Ravindra.Johari@xxxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 7 Feb 2006 15:24:23 +0200
Hi,
NRZI ensures that after a 0 bit appears, the voltage will immediately
switch to a 1 bit voltage level. This help clock to synchronize.
Edi
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Ravindra Johari
> Sent: Tuesday, February 07, 2006 12:39 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: PHY PCS
>=20
> Hi Guys,
> Continuing the discussion a little further, was wondering if anyone
can
> tell
> me why after 8B/10B encoding towards the transmit side the signal is
> converted to NRZI and then encoded..
> The other thing I did not get is why use different coding techniques
for
> different bit rates like Manchestar encoding for 10 base-T, MLT-3 for
> 100base-TX and PAM-5 for Gig??
>=20
> Let me know if anyone can throw light on this matter..
>=20
> Regards,
> Ravi..
>=20
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]
> On
> Behalf Of Edi Fraiman
> Sent: Thursday, February 02, 2006 3:14 PM
> To: steve weir; Ravindra.Johari@xxxxxxxxxxxxxxxxxx;
si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: PHY PCS
>=20
> Hi,
>=20
> The code was described in 1983 by Al Widmer and Peter Franaszek in the
> IBM Journal of Research and Development.
>=20
> Edi
>=20
> > -----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
> >=3D20
> > 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.
> >=3D20
> > 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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