6.Bandwidth Utilization: Multiplexing and Spreading

The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.

• DSSS
• FHSS
• FDM
• TDM

In synchronous TDM, for n signal sources of the same data rate, each frame contains _______ slots.

• n + 1
• n – 1
• 0 to n
• n

Which multiplexing technique transmits digital signals?

• WDM
• FDM
• TDM
• None of the above

The sharing of a medium and its link by two or more devices is called _______.

• modulation
• multiplexing
• encoding
• line discipline

_______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.

• Multiplexing
• Spread spectrum
• Modulation
• None of the above.

______ is an analog multiplexing technique to combine optical signals.

• WDM
• FDM
• TDM
• None of the above

FDM is an _________technique.

• digital
• analog
• either (a) or (b)
• none of the above

______ can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted.

• TDM
• FDM
• Both (a) or (b)
• Neither (a) or (b)

In TDM, the transmission rate of the multiplexed path is usually _______ the sum of the transmission rates of the signal sources.

• equal to
• less than
• greater than
• not related to

In a multiplexed system, ____ lines share the bandwidth of _____ link.

• 1; n
• n; 1
• 1; 1
• n; n