Page 139 - DCAP104_EXPOSURE_TO_COMPUTER_DISCPLINES

Exposure to Computer Disciplines

Notes WAN: A wide area network (WAN) is a computer network that covers a broad area (i.e., any
network whose communications links cross metropolitan, regional, or national boundaries).
WISP: Wireless Internet Service Providers (WISPs) are Internet service providers with networks
built around wireless networking.

1. Draw a schematic diagram of ADV7123 digital data communication.

2. Draw an Ethernet DC Power and Digital Data Connection Circuit schematic.

6.8 Self-Assessment Questions

1. What is Data Communication?
(a) The transmission of data from one location to another for direct use or further
processing.

(b) A system made up of hardware, software and communication facilities, computer
terminals and input\output devices linked locally or globally.
(c) A telegraphy system.
(d) A channel used to transmit data at a rate of 1000-8000cps.

2. The three classes of channel that makes up bandwidth are:
(a) Data, communication, transmission.
(b) Analogue signals, digital signals, standard telephone line.
(c) Narrow-band, voice-band, broad-band channels.
(d) Automatic dialing, signal transmission, modems.
3. A data communication system is made up of
(a) The transmission of data from one location to another for direct use or further
processing.
(b) A system made up of hardware, software and communication facilities, computer
terminals and input\output devices linked locally or globally.
(c) A telegraphy system.
(d) A channel used to transmit data at a rate of 1000-8000cps.
4. Coaxial cables, fiber optics cables, telegraph system and telephone line are grouped into
which bandwidth classes of channel?
(a) Narrow-band, broad-band, voice-band.
(b) Digital signals, analogue signals, transmission channel.
(c) Bandwidth, hardware, software.
(d) Broad-band, narrow-band, voice-band.
5. Which bandwidth classes of channel can transmit data at a rate of 1000 -8000 cps?
(a) Broad-band.
(b) Narrow-band.

(c) Voice-band.
(d) Internal modem.

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