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