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. 13 December 2018. <https://www.yourdictionary.com/ds-4>.
DS-4. (n.d.). Retrieved December 13th, 2018, from https://www.yourdictionary.com/ds-4
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