Questions and Answers
What is the base of the decimal system?
10
What is the primary purpose of connection devices in computer communication?
To act as an interface between devices and the communication channel
What is the hexadecimal representation of the decimal number 15?
F
What is the process of sharing data, programs, and information between two or more computers?
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What is the process of converting digital signals to analog signals called?
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What is the purpose of sending and receiving devices in a communication system?
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What is the unit of measurement for the speed of data transmission by modems?
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What is the base of the octal system?
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What is the term for the speed of data transmission by modems?
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What type of connection is referred to as T1?
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What is the term for linking people and resources?
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Study Notes
Computer Communications
- Computer communications is the process of sharing data, programs, and information between two or more computers.
- Communication systems consist of:
- Sending and receiving devices
- Connection devices
- Data transmission specifications
- Communication channel
Connection Devices
- Act as an interface between the sending and receiving devices and the communication channel.
- Convert outgoing messages into packets that can travel across the communication channel.
- Reverse the process for incoming messages.
Modem
- Enables digital personal computers to communicate across different media.
- Modulation: the process of converting from digital to analog.
- Demodulation: the process of converting from analog to digital.
Data Transfer Rate
- Measured in millions of bits (megabits) per second (Mbps).
- The higher the speed, the faster you can send and receive information.
Number Systems
- Binary system: base 2, consists of 0 and 1.
- Decimal system: base 10, consists of 0 to 9.
- Octal system: base 8, consists of 0 to 7.
- Hexadecimal system: base 16, consists of 0 to 9 and A to F.
Conversions
- Convert from any system to decimal:
- Convert binary 0011101011 to decimal.
- Convert octal 456 to decimal.
- Convert hexadecimal 47AB1 to decimal.
- Convert from decimal to any system:
- Convert 98 decimal to binary.
- Convert 360 decimal to octal.
- Convert 1900 decimal to hexadecimal.
- Convert between number systems:
- Convert binary 11 100 111 to octal.
- Convert octal 347 to binary.
- Convert binary 1 1010 1000 1111 to hexadecimal.
- Convert octal 5401 to hexadecimal.
Connectivity
- Refers to linking people and resources.
- Enables computers to connect to other computers and share resources.
