The signal level for a digital carrier system operating at level four of the North American digital signal hierarchy. A DS-4 corresponds to a T4 in the North American hierarchy. See also digital signal hierarchy and T4.
"DS-4." YourDictionary, n.d. Web. 25 May 2018. <http://www.yourdictionary.com/ds-4>.
DS-4. (n.d.). Retrieved May 25th, 2018, from http://www.yourdictionary.com/ds-4