License free spread spectrum and FSK wire industrial data communications

The principal industrial automation companies spend considerable time, effort and expense insuring that their equipment performs as flawlessly as possible. The need not only to collect, distribute and process data but also to transmit it makes the selection of data communications equipment, including modems, particularly important toward the maintenance of data integrity. Spread spectrum technology serves to significantly improve data transmission reliability and frequency hopping techniques further increase the assurance, in combination with error checking, that data will not be lost. Meticulous attention to the issues of interconnectivity, compatibility and interoperability with industrial automation equipment, including factory configuration of modems and cables are discussed. The authors go on to discuss FSK data communications over wire and their advantages