Communication Flashcards
(17 cards)
What is the definition of serial transmission?
Data is sent one bit at a time over one wire.
What is the definition of parallel transmission?
Uses multiple parallel wires in order to send multiple bits between components at the same time
What are Advantages of serial over parallel?
More reliability connection method over long distances
Cheaper as only use one wire to transfer data
What are Advantages and Disadvantages of Parallel transmission?
-Faster as sends multiple bits at one time
-More complex due to multiple wires and more expensive
-More prone to errors over long distance as they SKEW
What is synchronous transmission?
Data is transferred at regular intervals, synchronised by a clock pulse. Useful for time sensitive data, much faster
What is Asynchronous transmission?
Data is transferred one character at a time (in packets)with a start and stop bit and parity bit sent with each character
Normally used for low speed transmissions.
What is the start bit responsible for?
Synchronised receiver and indicates when data begins
What is the stop bit responsible for?
Allows start but to be recognised and indicates when data is being transmitted
What is Bandwidth?
A measure of how much information it can carry per unit of time and measured in bits per second
What is bit rate?
The number of bits that are transferred between devices per second
What is Baseband?
The simplest form of data transmission at each signal change just one bit transmitted
What is Baud rate?
Number of times a signal in communications channel changes per second. The higher the baud rate the more bits per second that are transferred.
What does the baud rate specify?
Maximum number of signal changes that the channel may have per unit of time.
How to calculate the bit rate of a channel?
Baud rate x the number of bits per signal
What is latency?
A time delay before some component in a computer system responds to an instruction
What is a protocol?
A strict set of rules for data transmission/communication
What is Handshaking?
When two computers exchange signals in order to set up a communication link.
