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Bandwidth
A measure of the capacity of the communication channel down which the data is being sent.
Relates to the range of frequencies available on the carrier wave (difference between the upper and lower frequencies). The greater the range of frequencies the larger the amount of data that can be sent in one frame.
Bit Rate
Baud Rate
Represents the number of electronic changes per second. One bit is usually sent on each state change, however it is possible to send more than one bit per state change by using different voltage levels to represent the bits.
Latency
The time delay that occurs when transmitting data between devices.
Propagation Latency: The amount of time taken for a logic gate within the circuit to transmit the data
Transmission Latency: The time taken for the data to pass through a particular communication medium (e.g. copper wire/ fibre optics)
Processing Latency: The time taken for data to pass around a network depending on how many servers or devices it has to pass through
Asynchronous Data Transmission
Data is transmitted between two devices that do not share a common clock signal. It synchronizes only for the duration of the duration of the transmission by sending start and stop bits.
Synchronous data transmission
Data is transmitted where the pulse of the clock sending and receiving device are in sync. The devices may share a common clock. No start or stop bits are required.
Start bit
Causes the receiver to synchronize its clock to the same rate as the sender.
Stop bit
Indicates that the data has arrived so the processor on the receiver's device can now handle those bits.
TCP/IP
Two protocols that relate to the set or rules that govern the transmission of data around the internet. Handles the touting and re-assembly of data packets.
HTTP
Hyper Text transfer Protocol: A set of rules that governs the exchanging of different types of file that make ups displayable web pages.
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