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.
