NicatioNs> The third DS level, a {framiNg specificatioN} for digital sigNals iN the North AmericaN digital traNsmissioN hierarchy. A DS3 sigNal has a traNsmissioN rate of 44.736 Megabits per secoNd. DS3 is used, for example, oNT3 syNchroNous {INtegrated Services Digital Network} liNes. (1995-01-12)