Exam 3: Physical Layer

Two fundamentally different types of data are:

Describe how data could be transmitted using a combination of modulation techniques.

In general, older networks and local loops designed to transmit voice data are likely to be ________.

Frequency modulation refers to the changing of the height of the sound wave.

One form of interference with satellite transmission is called raindrop attenuation in which the transmissions are absorbed by heavy rain.

Frequency division multiplexing:

The predominant method of transferring information internally in a computer is via parallel mode.

A coding scheme that uses 10 bits to represent each character is capable of representing _________ different characters.

Digital transmission produces more errors than analog transmission.

Multimode fiber is capable of longer transmission distances than single mode fiber.

Manchester encoding is a special type of bipolar signaling in which the signal is changed from high to low or from low to high in the middle of the signal.

____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.

The ability to transmit in both directions, but only in one direction at a time is an example of _______________ transmission.

Compare and contrast data rate i.e., bits per second) and symbol rate also called baud rate) by giving two concrete, different examples.

Ethernet, a common LAN technology, uses Manchester encoding.

Which of the following is the most secure wired media?

Frequency division multiplexing divides the circuit into a set of different time slots.

Fiber optic cable can only be used on LANs.

Which of the following is a characteristic of sound waves that can be modulated to convert digital data into analog signals?

Propagation delay is negligible with satellite transmission.