Technically, switching is a key component of certain types of what are called modulation techniques. Frequency shift keying requires switching between on and off, or one and zero frequencies, for example. I suppose that anything that is done to a carrier, whether it is turning it on and off, or altering its waveform characteristics [e.g., QAM, which tampers with both phase (which is a derivative of frequency) and amplitude] can be considered modulation, so long as both the sending and receiving entities knows what each alteration means.
But in a broader sense, switching usually refers to changing the state and the actual end points of a connection (which means, which of two or more links will be connected to one another. Whereas, modulation commonly refers to a specific scheme that is used to impart or encode information onto a carrier signal or state (voltage, photonic flow, electro-magnetic field).
I can see, in a very vague kind of way, where you see the similarities with SR's scheme, although I have to seriously wonder if SR saw it that way, too.
So, wrt SR, I've not taken the opportunity to ask you yet what you think of the outcome there. Any notable thoughts or insights worth bringing to the thread? |
