2.6) Tools for Information Processes Worksheet – Transmitting and Receiving
· Transmitting and receiving is the…
· There are two main kinds of digital transmission: ______& ______
· S______transfer …
· P______transfer …
· [FIGURE 2.23, p.70]
· Serial transfer is used over longer distances for devices such as ______and ______and through such media as ______, ______
______, ______& ______.
· Serial transmission can be either ______or ______.
· In asynchronous transmission, each byte…
· A parity bit is an additional bit that is used to check for errors in transmission.
· Parity bits can be either odd or even, if an odd parity is chosen then …
· If an even parity is chosen then…
· If an error has occurred in a single bit then…
· Synchronous transmission requires…
· It is faster…
· Direction of data flow can be either ______, ______, or ______.
· [FIGURE 2.24, p.71]
· Simplex:
· Half duplex:
· Full duplex:
· The speed of data transmission is measured either by its ______rate or the number of ______
______(bps).
· Baud rate is the …
· Bps can be different from baud rate because…
HARDWARE
· Every part of the computer is linked to the CPU via a ______.
· A ______is a pathway of wires and ______that provides a link between…
· The size of a bus is called its width. The greater the width, the more data that can be transmitted.
· E.g.
· An internal bus…
· An external bus…
· Peripheral devices are linked to the CPU through ______and ______.
· An expansion slot is…
· An expansion card is…
· Expansion cards are used to…
· A port is…
· Ports can be either serial or parallel.
· Parallel ports…
· Serial ports…
· A modem is a device that enables..
· The word modem stands for ______/______.
· A modem …
· Modems can be either internal or external.
· The speed of a modem is measured in…
· Some modems have fax capabilities…
· Networks exist when…
· Devices used to send or receive data are called terminals. These terminals can be dumb, smart or intelligent.
· Dumb terminals…
· Smart terminals…
· Intelligent terminals…
· Networks are classified according to the distance they cover.
· LAN’s…
· Three advantages of LAN’s are:
· WAN’s cover much larger spaces.
· Because of this they rely…
SOFTWARE
· Special communications software is used to send and receive data over modems and networks.
· Communications software manages…
· A protocol is…
· Compression …
· Email…
· Encryption of data..
Non-computer Tools
· Conventional tools such as mail, ______, ______, ______and ______are used to transmit and receive.
· Each of these can be compared and contrasted with computer-based systems.
Social and Ethical Issues
· The accuracy of data on the Internet…
· The security of data…
· ‘Netiquette’…
· Acknowledgement of sources and ownership of material. Failure to acknowledge the work of others, or trying to pass it off as your own work is considered plagiarism.
· Privacy…
· The nature of work has changed…
· Traditional businesses have been impacted…