Chap#03 Data Communications Flashcards
The device that converts the digital signal to a form that can pass through a transmission medium is:
Encoder
The number of times a wave repeats itself during a specific time intervals its:
frequency
Data can be in the form of:
➡Numbers
➡Images
➡Characters
A combination of four binary digits is called:
Nibble
The coding scheme that represents up to 65, 536 symbols:
Unicode
Data communication requires:
➡Sender
➡Receiver
➡Medium
The data transmission mode in which data flows in one direction only is:
SImplex
The fastest mode of data transmission is:
Simplex
Coaxial cables can transfer data at a maximum rate of:
100 Mbps
Twisted pair cables can transfer data to a maximum distance of:
100 meters
The cable that consists of tubes of glass through which data are transmitted as pulses of light is:
Fiber Optic
The unguided media carry signals in the form o:
Electromagnetic Waves
A system in which data can be received and sent simultaneous is called:
Full-duplex
In data communication, the sender is also called:
Source
Propagation of signals across a comunication medium is known as:
Transmission
All of the following are true of the simplex mode except:
It is the most commonly used communication mode
The exact format of the frame in case of synchronous transmission depends on whether the transmission scheme is read more:
Either character-oriented or bit-oriented
A digital channel implies that the channel:
s carrying digital data
The unguided media consists o:
➡Microwaves
➡Infrared waves
A modem:
➡converts analog signals into digital signals
➡converts digital signals into analog signals
The maximum dta rate that a medium of 10KHz and signal to noise ratio of 30dB is roughly:
30Kbps
External modems:
➡are expensive
➡have more operational features
➡offer high transmission speed
Which of the following medium does not use metallic conductor for transmission?
Optical fiber
The maximum rate at which a modem can transmit data s around _____ bps.
14,400
