1. AMP (2008). http://www.ampnetconnect.com.
2. Cisco (2008). Cisco ONS Family Optical Pluggable Modules. http://www.cisco.com/en/US/prod/collateral/optical/ps5724/ps2006/brochure_c02-452560.html
3. Mantainability, Maintenance and Reliability for Engineers;Dillon,2006
4. Industrial Ethernet goes process automation…and what about explosion protection?;Fritsch,2007
5. Hirschmann (2008). Sitio web de Redes Industriales de Hirschmann. http://www.hirschmann-ac.de/Espanol/Redes-Industriales/index.phtml