A T1 uses which of the following to multiplex DS0s into a composite T1? A. Channel division B. Frequency-hopping spread spectrum C. Frequency division D. Time division Solution D. T1s use time division to break the individual DS0s into 24 separate channels. Time division is the allotment of available bandwidth based on time. It allows the T1 to carry both voice and data at the same time. Answer A is incorrect because there is no system known as channel division. Answer B is incorrect because FHSS is used by mobile devices. Answer C is incorrect because T1s do not use frequency division.