Multi-Input Networks
I am used to working with the complex communications networks employed by digital computers. In order for such networks to function, a strict set of rules must be followed by all participants in the network. A collision occurs when two or more parties attempt to transmit on a shared channel at the same time. In such a case, the parties must then attempt to re-send their information at different intervals to ensure receipt.
While driving to work last week, the signal from my iPod FM transmitter was overshadowed by a stronger signal nearby. We both had were attempting to broadcast on the FM frequency 87.9. I disconnected the transmitter from my iPod and began listening to an FM broadcast emanating from a nearby car. I could hear the broadcaster skipping songs until they settled on one they liked. It was a fun, voyeuristic-like experience.
In this case, two parties were attempting to broadcast on a shared channel and caused a collision. If the other person had a stronger signal, they may have had no idea that a collision was even occurring. Because my signal was weaker, I was plenty aware that a collision occurred - my music wasn't audible through the car stereo.
The amazing thing about analog networks is the inherent imbalance of power between participants. The one with the strongest signal wins. End of story. But, in a digital network everyone is on an even playing-field. The later is a much simpler environment to work in, and it's obvious why businesses and governments rely on digital networks for their most important operations. So what are analog networks good for?