UNIT 1: THE ONLINE WORLD Data exchange

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Data exchange

Understand the concepts, processes and implications of data exchange and compare

different methods, including:

● data exchange as the passing of data between computers in a network including the

internet

● transmission modes (simplex, half-duplex and duplex) used by digital devices

including smart phones, printers, computer processors, remote controllers

(e.g. for TVs)

● the hardware and software required for real-time communication including Voice over

Internet Protocol (VoIP) and web meeting/conferencing

● the role of a Coder/Decoder (CODEC) in the transmission of a VoIP, audio-file and

video-file conversation

● main characteristics of alternative transmission methods, including:

o fibre optic

o wireless (infrared, microwave, satellite)

o wire connectors

● parallel and serial transmission of data, and bi-directional transmission

● the benefits of packet switching as a method of sending data over a wide area

network

● the contents of a packet as a group of bits that include packet identification,

error control bits, coded data, destination address

● comparison of data transfer rates, effective ranges, and identify appropriate uses

of different transmission methods, including:

o fibre optic

o wireless (infrared, microwave, satellite)

o wire connectors.

Understand the concepts, structures and implications of wireless networks, including:

● the components of a wireless network including router, access points and wireless

network adaptors

● client-side processing including the use of rollover images on a web page

● server-side processing including submitting a completed form on a web page

● the difference between client-side processing and server-side processing and

examples of client-side and server-side processes.