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Q.

Bulletin board system

A

is a public access message system

B

is a modem capable of accepting commands

C

converts analog signals to digital signals

D

converts digital signals to analog signals

E

None of the above

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1.

The transmission signal coding method of TI carrier is called

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Bipolar

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NRZ

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Manchester

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Binary

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None of the above

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2.

Who invented the modem?

A

Wang Laboratories Ltd.

B

AT & T Information Systems, USA

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Apple Computers Inc.

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Digital Equipment Corpn.

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None of the above

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If odd parity is used for ASCII error detection, the number of 0s per eight-bit symbol is _____.

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even

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odd

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indeterminate

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Many data communication networks have been established which provide a wealth of on-demand information services to people at home. What is the name of the system which provides an interactive, graphics-rich service that permits user to select what they want?

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Teletex system

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Fax system

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Videotex system

D

Microwave system

E

None of the above

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When the pointer is positioned on a _____ it is shaped like a hand.

A

Grammar error

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Hyperlink

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Screen tip

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Spelling error

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Formatting error

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