C2

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BlueCray

Cards (17)

Digital signal 
Discrete or discontinuous signals such as a sequence of voltage pulses, can have only a limited number of defined values often as simple as 1 and 0
Analog signal 
Continuously varying electromagnetic wave, is a continuous wave form that changes smoothly over time
Bit 
Smallest unit of information, represents either 0 or 1
Byte 
A string of 8 bits
Bit rate 
Total bits that travel per second, measured in bits per second (bps)
Baud rate 
Total number of times changes of signal occurs in a second
Frequency 
Number of waves that pass a fixed place in a given amount of time, measured in Hertz (Hz)
Bandwidth 
Capacity to carry information or data, the maximum amount of data transmitted over a connection in a given time, measured in Hertz (Hz)
Modem 
Device that connects a computer to an internet service provider, converts digital data to analog signals and vice versa
Types of modem 
Cable modem
Modem eliminator
DSL modem
Short-haul modem
Data codes 
Rules to convert strings of bits into characters to enable computer communication, examples include Morse code, Baudot code, ASCII, EBCDIC, Unicode
Data code characteristics 
Standard ASCII (7 bits, 128 characters)
Extended ASCII (8 bits, 256 characters)
EBCDIC (8 bits, 256 characters)
Unicode (16 bits, 65,536 characters)
The telephone system enables people to communicate by converting human voice into a signal that can be transmitted over telephone lines
Telephone network 
Local end office/central office (CO)/exchange office (EO) is where call switching takes place
Local loop is the wires connecting home to end office
Telephone lines use voice-grade circuits, the lowest grade line used for voice telephone calls and dial-up lines
Multiplexing is used to combine many calls on a single telephone line, using guardbands to separate the calls
Telephone signals are used to indicate the various status of calls on the network, such as dial tone, ringing, busy