Moving bits by air, land, and sea carriers, vans and packets
Mário Gerla, John Eckl · Managing Requirements Knowledge, International Workshop on · 1899
In the past, the data network designer was confronted with only a few choices relative to communications service alternatives and line tariffs. Basically, he had to choose between dial-up or private line from terminal to computer and, in the case of private line, between narrowband or voice grade. After this preliminary choice was made, the network was optimized based on a well defined line cost structure.