Two systems that are functionally identical. They both may perform the same functions, or one may be standby, ready to take over if the other fails.
"duplexed system." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/duplexed-system>.
duplexed system. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/duplexed-system