Flashcards
3. Data Transmission
Cards in this deck (20)
- 1Key Terms- Series
- Parallel
- Simplex
- Duplex
- Parity
- Packet
- Bit - 2Series Transmission- One bit at a time
- Slow - 3Parallel Transmission- > 1 bit at a time
- Fast
- Cat5 cable - 4Simplex- One way flow
(e.g. TV remote)
- 5Half Duplex- Both ways
- Only one at a time
(e.g. walkie talkie)
- 6Full Duplex- Both ways at any time
(e.g. phone calls) - 7MultiplexingMultiple signals --> at same time via a shared medium
E.g. Fibre Optic - 8Packet Structure- Header
- Payload
- Trailer - 9Packet Contents- Sender's address
- Recipient's address
- Payload (Data)
- Error control bits
- Packet ID - 10Packet Use Diagram
- 11Circuit Switching - Function- Set route
- Private
- Data travels in order
(e.g. phone networks) - 12Circuit Switching - Cons- Break in route causes error
- 13Packet Switching- Packets take independent routes
- Chose fastest way
- Not ordered ∴ packet ID needed - 14Network Collisions- Two packets detected at same time
- Packets get deleted ∴ resend message sent to sender
- Sender resends packets after random interval - 15Parity- End of data + bit
- Tells recipient what data should look like
- Data is resent if wrong - 16Even Parity- Checks # of 1s in data
- Returns error if not even - 17Even Parity Diagram
- 18Odd Parity- Same as even parity but checks for odd #s instead
- 19Internet- WAN consisting of smaller WANs
- Uses standard IP (TCP/IP)
- Wired, wireless, fibre-optic
- Uses specialist hardware - 20WWWWorld Wide Web != internet
WWW is feature of internet, like emailing and file transfer
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- A Level Computer Science ((AS) Unit 1: Fundamentals of Computer Science ) Flashcards on 3. Data Transmission, created by Scott Jones on 31/07/2019.
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- Scott Jones
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