Computer Science : S2 : L2 : Transmission Methods

Data transmission

The process of sending data from one component to another, either over short distances within a local computer or over long distances between computers.

Simplex data transmission

One-directional data transmission, where data flows from a sender to a receiver, such as sending data from a computer to a monitor.

Half duplex transmission

Two-directional data transmission using a single cable, but not simultaneously. For example, when using parallel printer cables, the printer can send back error codes but needs to wait for the computer to finish before transmitting.

Full duplex transmission

Two-directional data transmission at the same time using two communication channels.

Serial data transmission

Sending individual bits of data one at a time via a single cable. It is slower than parallel transmission but can transmit data over long distances. USB is an example of serial transmission.

Parallel data transmission

Sending multiple bits of data simultaneously through separate wires or channels. It is faster than serial transmission but can be prone to interference and synchronization issues over long distances.

Universal Serial Bus (USB)

A serial method of transmitting data that allows for both half and full duplex transmission. It is an industry standard with automatic device detection and driver loading.

USB cable

A four-wire shielded cable consisting of two wires for power and two wires for data transmission.

Benefits of USB

Automatic device detection, industry standard with widespread support, ability to support different transmission rates, error detection and retransmission, easy addition of more ports, compatibility with older standards.

Drawbacks of USB

Connections only fit one way, limited distance of around 5m, slower transmission rate compared to Ethernet, older standards may not be supported by the latest computers.