I think the latter. Layer 1 defines both putting 1s and 0s on the wire as well as physical aspects of connectivity. EIA-232 is a fair example. It specifies valid voltages/states to represent a 1 or a 0 but it also specifies that TX Data is on pin 2 of a 25 ping D shell connector, etc. If that aint layer 1, I don't know what it is. Maybe it is easiest to think of everything that doesn't fit the layer two definition as defaulting to layer 1. There may be a fallacy in that, but I think its fairly safe.
Scott Steven A. Ridder wrote: > > I've read in some books that the physical layer (L1) of the OSI > model deals > with the logical functions of putting the 1's and 0's onto a > wire and not > the physical act of doing so, and I've read other books that > state that the > physical layer deals with not only putting 1's and 0's onto a > wire, but also > the mechanical make-up of a wire, the electrical voltage of a > wire, > hardware,. etc. > > Which is true? > > -- > RFC 1149 Compliant. > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=35546&t=35544 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
