DCE(Data Communications Equipment) 범주에 속하지 않는 것은?
DSU(Digital Service Unit)
CSU(Channel Service Unit)
MODEM(Modulator/Demodulator)
TDM(Time Division Multiplexing)
DCE(Data Communications Equipment) 범주에 속하지 않는 것은?
A. DSU(Digital Service Unit)
B. CSU(Channel Service Unit)
C. MODEM(Modulator/Demodulator)
D. TDM(Time Division Multiplexing)