Telecommunications

Communication Path Hardware

Twisted Pair

http://en.wikipedia.org/wiki/Twisted_pair

Coaxial Cable

http://en.wikipedia.org/wiki/Coaxial_cable

Fibre Optics

http://en.wikipedia.org/wiki/Fibre_optics

Wireless

http://en.wikipedia.org/wiki/Wireless

Hardware Connections

Total Connection Calculation

If everyone in the world was connected to everyone else, the total number of connections would be "Population x Population - 1"

If people are connected to interconnected routers, then the total number of connections uses a logarithmic equation and hence much lower.