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E How data is transmitted by computer systems (E1 Transmitting data (Types…
E How data is transmitted by computer systems
E1 Transmitting data
Types of communication channel:
simplex
half-duplex
full-duplex
point-to-point
multi-drop.
Methods of connecting devices and transmitting data across and between computer systems.
The selection of connection methods to fulfil specified tasks and functions.
Asynchronous and synchronous data transmission.
Parallel and serial transmission.
Use of packet data in transmitting data:
contents of a data packet
the role of components of a data packet
packet switching.
Protocols used to govern and control data transmission
The features, applications and implications of encryption
simple encryption ciphers:
Caesar cipher
Vigenère cipher
encryption used in computer systems:
symmetric key encryption
public key encryption
Types of compression:
lossy
lossless
The applications and implications of data compression.
E2 Error detection
Methods used to detect errors in data transmission:
parity schemes
checksum
repetition schemes
cyclic redundancy check (CRC).
The concepts, implications and applications of error detection.
E3 Error correction
Commonly-used error correction systems:
automatic repeat request (ARQ)
forward error correction (FEC).
The concepts, implications and applications of error correction systems.