单选题
Which about Time Division Multiplexing is true ? ( )
A、
TDM can only transmit digital signals
B、
TDM divides the time that is used to transmit signals by channel into several time fractions and each user get a time fraction
C、
Synchronous TDM may allocate channel time fraction dynamically
D、
TDM can only transmit analog signals
【正确答案】
B
【答案解析】
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