Communications and Computer Networks: Multiplexing

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What is the main purpose of multiplexing in computer networks?

To transfer multiple connections over one carrier (correct)
To increase the transmission speed of a single carrier
To reduce the number of carriers needed for transmission
To encrypt data transmission

Which multiplexing technique is used in fibre optics?

Time-Division Multiplexing
Wavelength Division Multiplexing (correct)
Code Division Multiple Access
Frequency-Division Multiplexing

What is the main difference between baseband and broadband transmission?

Baseband is used for single-channel transmission, broadband for multi-channel transmission (correct)
Baseband is used for low-speed transmission, broadband for high-speed transmission
Baseband is used for wireless transmission, broadband for wired transmission
Baseband is used for digital signals, broadband for analog signals

What is the purpose of a spreading code in Code Division Multiple Access?

To multiplex multiple signals over a single carrier (D) Signup and view all the answers

Which of the following is an example of Time-Division Multiplexing?

ISDN (C) Signup and view all the answers

What is the main advantage of Frequency-Division Multiplexing?

It allows for simultaneous transmission of multiple signals (A) Signup and view all the answers

What is the maximum length of a fiber optic link at 10 Gbit/s using 10GBASE-SR?

500 m (C) Signup and view all the answers

What is the wavelength used in 10GBASE-LR(M) fiber optic links?

1310 nm (D) Signup and view all the answers

What is the maximum length of a fiber optic link at 40 Gbit/s using 40GBASE-SR4?

1000 m (D) Signup and view all the answers

What is the basic principle of wireless transmission?

Transmission of electromagnetic waves through free space (A) Signup and view all the answers

What type of transmission media is used in Wi-Fi?

Wireless (B) Signup and view all the answers

What is the purpose of a wave type converter in wireless transmission?

To convert the conducted wave into a free space wave (B) Signup and view all the answers

What happens to the delay time difference of the various rays in multimode fibers?

It disappears almost completely (B) Signup and view all the answers

Why are single-mode fibers not employed for long distances?

Due to difficult manufacturing process (C) Signup and view all the answers

What is the typical application of single-mode fibers?

LANs with short distances (C) Signup and view all the answers

What do the ITU-T Rec. specifications G.652, G.653, and G.655 refer to?

Types of single-mode fibers (D) Signup and view all the answers

What can be inferred about the cost of single-mode fibers?

They are relatively expensive (C) Signup and view all the answers

What is the primary factor that causes the delay time difference of the various rays in multimode fibers to disappear?

The lower refractive indices outside of the fiber axis (C) Signup and view all the answers