Tele Midterm 1

attenuation

Another term for the weakening of a signal over distance is:

codec

Equipment used to transform analog voice signals to digital signals and digital signals to analog signals.

operates by dividing the signal into different frequencies

Frequency division multiplexing:

9100 Hz

If the highest frequency of a circuit is 10KHZ and the lowest frequency is 900 Hz, the bandwidth available for this circuit is:

phase modulation

In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?

combining several low speed circuits to enable them to be transmitted across one high speed circuit

Inverse multiplexing means:

bandwidth

The _____________ of a circuit determines a circuit's capacity.

half-duplex

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

amplitude

The height of a sound wave is called its:

digital coding

The representation of the character A by the group of 8 bits, 01000001, is an example of:

guided and wireless (radiated)

The two basic types of media are:

wavelength division multiplexer

The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:

20 to 14,000 Hz

The typical range of human hearing is:

splits the communication circuit vertically (with time slots) instead of horizontally

Time (non-statistical) division multiplexing differs from frequency division multiplexing because it:

differ widely among media

Transmission speeds:

serial

When all bits of a character are transferred one after another, the bits are transferred in ___________ mode.

phase

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

prestige value of the type of media

Which of the following is not an important factor to consider when selecting media to be used in a network?

fiber optic cable

Which of the following media can best withstand harsh environmental conditions?

fiber optic cable

Which of the following media has the lowest error rates and the highest transmission speeds?

infrared

Which of the following media is the least secure?

Serial transmission is slower than parallel transmission.

Which of the following statements is correct?

bipolar

Which type of digital signaling would experience fewer errors because it has more distinct signals?

Amplitude Modulation

With respect to converting digital data into analog signals, AM stands for:

Data rate signaling

___________ is not a type of digital signaling technique.

ASCII

____________ is one of the most commonly used coding schemes used in data transmission.

modulation

____________ refers to changing the shape of the sound wave in different ways to represent a 1 or a 0.

Propagation delay

______________ refers to the time it takes for a signal to travel from sender to recipient (highly exaggerated with satellite transmission).

Guardbands

________________ separate channels to reduce interference between channels in frequency division multiplexing.

multiplexer

A(n) ___________ divides one high-speed communication circuit into several lower speed circuits for the primary reason of saving communication line costs.