Test 7 (JavaScript)

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Test 7

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1: Data in a simplex circuit

travels in both directions simultaneously
travels in both directions but not at the same time
is always digital
travels in one direction only

2: Parallel transmission of data

uses a single pair of wires labelled transmit and receive
uses a single wire for each bit
is very slow
is used by public communication carriers to implement telephone circuits

3: The unit of measurement for frequency is

Hertz
decibels
volts
ohms

4: A protocol is

a set of rules for a transmitter of data
X.400
X.25
a set of rules which govern how data is sent from one point to another

5: Bandwidth defines

the lowest frequency that a data communications channel will pass
the highest minus the lowest frequency that a data communications channel will pass
the highest frequency that a data communications channel will pass
the middle frequency of a data communications channel

6: In a half duplex circuit, data may be sent in either direction

TRUE
FALSE

7: A digital signal has two states, logic 1 and logic 0

TRUE
FALSE

8: The unit of measurement for amplitude is either volts or decibels

TRUE
FALSE

9: Parallel data transmission is slower than serial data transmission

TRUE
FALSE

10: A leased line is a permanent non-switched end to end connection

TRUE
FALSE

11: A multiplexer is a device which shares a number of communications links between a number of users

TRUE
FALSE

12: The BANDWIDTH of a 300Hz to 3400Hz voice channel is

300Hz
3100Hz
3400Hz
100Hz

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