Here's a paragraph from Gigabit Ethernet, (Kadambi, Crayford, and Kalkunte
Prentice Hall 1988),
Manchester encoded data is used for data transmission across the AUI (and
across all of the common media currently defined for the 802.3 networks at
data rates of 10 Mb/s). Each bit of information is converted into a
"bit-symbol," which in turn is divided into two halves. During the first
half of the bit-symbol, the representation is the compliment of the data bit
being encoded, and during the second half of the bit-symbol, the
representation is identical to the data bit value. In this way, a transition
is guaranteed in the center of every bit-symbol, hence clock and data
information are encoded into a single serial representation. Manchester
encoding/decoding is performed in the PLS sublayer.
Is this any help?
Shawn
----- Original Message -----
From: "Priscilla Oppenheimer"
To:
Sent: Thursday, May 31, 2001 1:48 PM
Subject: Re: Manchester symbols - addendum [7:6692]
> One other thought. The term "symbol" sometimes gets used for non-data
> values. For example, Token Ring has a j and k symbol used in the starting
> and ending delimiters. These are intentional violations of differential
> manchester encoding. I haven't heard that Ethernet has anything like that
> when manchester encoding is used, but it might.
>
> Priscilla
>
> At 07:25 PM 5/31/01, hal9001 wrote:
> >Thanx for that!
> >
> >karl
> >----- Original Message -----
> >From: "Priscilla Oppenheimer"
> >To: "hal9001" ;
> >Sent: Friday, June 01, 2001 12:05 AM
> >Subject: Re: Manchester symbols [7:6655]
> >
> >
> > > The original 10-Mbps Ethernet II and 802.3 standards use Manchester
> > > encoding for all media types. Manchester encoding specifies that a bit
> > > period is divided into two equal intervals and there is always a
> >transition
> > > from either high to low or low to high in the middle of the bit
period. A
> > > binary zero is high first and then low. A binary one is low first and
> then
> > > high. I haven't heard these called symbols, but perhaps your reference
> > > calls them symbols.
> > >
> > > Priscilla
> > >
> > >
> > > At 07:09 PM 5/31/01, hal9001 wrote:
> > > >Thanx for that any idea about the symbols?
> > > >
> > > >Karl
> > > >----- Original Message -----
> > > >From: "Fred Ingham"
> > > >To: "hal9001" ;
> > > >Sent: Thursday, May 31, 2001 11:45 AM
> > > >Subject: Re: Manchester symbols [7:6655]
> > > >
> > > >
> > > > > Manchester encoding is used on 10 Mbps Ethernet, Differential
> >Manchester
> > > > > encoding is used on token ring.
> > > > >
> > > > > Fred.
> > > > >
> > > > > hal9001 wrote:
> > > > > >
> > > > > > Something to do with Ethernet Encoding I fink...anyone else?
> > > > > >
> > > > > > Karl
> > > > > > ----- Original Message -----
> > > > > > From: "g_study"
> > > > > > To:
> > > > > > Sent: Thursday, May 31, 2001 9:07 PM
> > > > > > Subject: Manchester symbols [7:6655]
> > > > > >
> > > > > > > What are Manchester symbols?
> > > ________________________
> > >
> > > Priscilla Oppenheimer
> > > http://www.priscilla.com
> ________________________
>
> Priscilla Oppenheimer
> http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=6791&t=6692
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