[SI-LIST] R: Transmission line impedance

Dear Sam, 
obviously there is nothing special in 50 ohm or 60ohm or whatevere value
SI theory and practice are based upon Maxwell equation and its semplified form 
Trasmission line equation
that simply works for any impedance value ....

Giancarlo


-----Messaggio originale-----
Da: si-list-bounce@xxxxxxxxxxxxx per conto di Sam Pete
Inviato: mer 20/12/2006 7.27
A: si-list@xxxxxxxxxxxxx
Oggetto: [SI-LIST] Transmission line impedance  
 
Hi Friends,
   
  Whenever we refer to SI books or application notes, the impedance of the 
transmission line is mentioned as 50-ohms or 60-ohms.  What is the speciffic 
reason behind this value? why can't it be something different than this? OR Why 
this 50-ohms conceptualized from the driver's perspective? (evolution of 
transmission line theory for Digital Design)
  Please flood me some info on this.
   
  Regards,
  Sam
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