Communication And Networks Flashcards
What is communication?
The transfer or exchange of information between two parties via some medium.
What is bit rate?
The number of bits transferred per second between two devices
What is the baud rate?
A measure of how many symbol changes can take place within a second across a communication medium.
What is bandwidth?
The frequency range available within a communication medium, measured in Hz. // The difference between the highest and lowest frequencies
What is latency?
Time delay between a message being sent and received
What is bit rate influenced by?
- Baud rate
- Bandwidth
- (Latency)
When can the bit rate exceed the baud rate?
If multiple bits are encoded into one symbol
How do you calculate bit rate?
Bit rate = Baud rate x Bits per symbol
What is serial data transmission?
Where data is transmitted one bit at a time
What is parallel data transmission?
Involves sending multiple bits simultaneously across multiple wires
What are the main problems with parallel transmission?
- Data Skew
- Crosstalk
What is data skew?
The differences in time that each bit is received.
What does data skew depend upon?
- Propagation delay between a single clock source and the transmission circuit for each bit
- Physical properties of the wiring used to transmit each bit
What is crosstalk?
The interference that occurs between parallel wires resulting in the corruption of bits due to interactions in electric fields.
What are other issues of parallel transmission?
- Higher cost for cables and connectors
- Physically larger connectors making miniaturisation difficult
- Decreased reliability
