What would a viable long-distance communications network in the age of peak oil look like? To begin with, it would use the airwaves rather than land lines, to minimize infrastructure, and its energy needs would be modest enough to be met by local renewable sources. It would take the form of a decentralized network of self-supporting and self-managing stations sharing common standards and operating procedures. It would use a diverse mix of communications modalities, so that operators could climb down the technological ladder as needed, from computerized data transfer all the way to equipment that could be built locally with hand tools. It would have its own subculture, of course, in which technical knowledge and practical expertise would be rewarded, encouraged, and fostered in newcomers. Finally, it would take a particular interest in emergency communications, so that operators could respond to disruptions and disasters with effective workarounds at times when having even the most basic communications net in place could save many lives.
The interesting thing, of course, is that a network that fills exactly these specifications already exists, in the form of amateur radio.