Exam 2: chap 3
____ refers to the difference between the original analog data and the approximation of that data using the techniques for translating from analog data to digital signals
Quantizing error
Which is not true about point to point circuits
point-to-point circuits reduce the amount of cable required and use the circuit more efficiently than multipoint circuits.
equipment used to transform analog voice signals to digital signals and digital signals to analog signals
codee
which of the following media has the lowest error rates and the highest transmission speeds?
fiber optic cable
Having a conversation with someone using a cellular phone is an example of _________ transmission.
full-duplex
the ability to transmit in both directions, but only in one direction at a time is an example of _____ transmission.
half-duplex
to get more "bandwidth" in a digital transmission, you must:
increase the rang of frequencies available for a transmission
The type of multiplexer that divides the circuit horizontally into different light frequencies that are transmitted simultaneously across many channels is a:
wavelength division multiplexer
Microwave transmission:
- type of high frequency radio communication - requires a clear line of sight path - is typically used for long distance data transmission - does not require the laying of any cable
a coding scheme that uses 10 bits to represent each character is capable of representing ____ different characters.
1024
If each sample uses 16 bits and the number of samples taken each second is 8000; then the transmission speed on the circuit is?
128 Kbps
when converting analog voice data to digital signals. Pulse Code Modulation typically samples the incoming voice signal ____ times per second
8000
With respect to converting digital data analog signals, AM stands for what
Amplitude Modulation
the acronym, modem stands for
modulator-demodulator
a (n) _____ divides one high-speed communication circuit into several lower speed circuits for primary reasons of saving communication line costs
multiplexer
The height of a sound wave is called its
amplitude
In general, older networks and local loops designed to transmit voice data are likely to be ________.
analog
another term for the weakening of a signal over distance is
attenuation
which type of data signaling would experience fewer errors because it has more distinct signals?
bipolar
transmission speeds:
differ widely among media
in general, networks designed to transmit primarily computer data are likely to be ____
digital
two fundamentally different types of data are
digital and analog
The representation of the character A by the group of 8 bits, 01000001, is an example of
digital coding
Frequency Division Multiplexing
operates by dividing the signal into different frequencies
In which type of modulation is a 1 distinguished from a 0 by shifting the direction in which the wave begins?
phase modulation
Data is physically transmitted from one computer or terminal to another in the ________ layer.
physical
which of the following is not important factor to consider when selecting media to be used in a network?
prestige value of the type of media
With which type of digital signaling does the signal always return to zero volts after each bit?
return to zero signaling
When all bits of a character are transferred one after another, the bits are transferred in ___________ mode.
serial
A ____ circuit is another name for a multipoint configuration.
shared
When you send an email from the US to Europe, its likely is transmitted from one continent to another through one of the ____ that connects America to Europe
submarine cables
data rate =
symbol rate x (# of bits/symbol)
_____________ is not a form of modulation used to transform digital data into analog signals.
synchronous time division