[rescue] FDDI questions

[Dave McGuire]

On February 18, Julius Sridhar wrote:
> > > > simply flow through both without any special effort, right? Or is there the
> > > > equivalent of MDI/MDIX, therefore requiring a crossover cable?
> > >
> > > As long as you connect the TX of one to the RX of the other, it will work.
> > > Everything in FDDI is a "crossover" configuration.  You are always
> > > connecting the TX of one to the RX of the next.
> >
> > Not quite true.  There are different types of ports when you deal with
> > FDDI.  A, B, M, and S.  You can plug A into B, B into A, M into A,B, or S,
> > and S into S.  A-A, B-B, and M-M are not allowed (you can plug them in,
> > but your FDDI gear will tell you to go pound sand).
> 
> Doesn't this (at least for the most part) come logically out to TX->RX?

  Yes, but it's illegal.  Simply maintaining a TX->RX ring isn't enough.

     -Dave

-- 
Dave McGuire
St. Petersburg, FL         "Less talk.  More synthohol." --Lt. Worf