Which is wrong among the following descriptions of Nyquist’s criteria?
If the following is a Manchester encoded waveform of 8-bit data, what is this data?
Which is wrong among the following statements about satellite communication?
When FSK modulation is performed on a signal, and if the carrier frequency is fc and the original/modulated signal frequencies are f1 and f2 respectively (f1 < f2), what is the relationship between the three?
Which is the modulation and demodulation technology mainly used among the following communication modes?
What is the channel communication mode in which both communication parties can transmit data simultaneously at the same time?
Generally speaking, for high-speed local area networks with large volume, which should be selected in order to obtain higher performance among following media?
What are the three basic forms of analog data coding?
Among the following descriptions of the physical layer, which is wrong?
Among the following descriptions of data transmission rate, which is wrong?
Generally speaking, digital transmission can get higher signal quality than analog transmission, because?
Among the following data exchange modes, the transmission delay of data through the network is long and unstable. Which cannot be used for voice data transmission?
When a digital signal is transmitted in an analog transmission system, what are required at the transmitting and the receiving ends respectively?
Dividing the frequency bandwidth of the physical channel into several subchannels, each subchannel transmitting one signal. What is this multiplexing technology called?
During data transmission, local telephone network has a physical connection line between the source node and the destination node, which constitute intermediate nodes. What is the technology adopted by this local telephone network called?