Data Communication and Networking – Data transmission Interfaces and Modems MCQs

This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data transmission Interfaces and Modems”.
 

1
. RS-232 is now known as _______
  • OSI-232
  • EIA-232
  • ITU-232
  • IEEE-232
2
. The most popular implementation of EIA-232 is a _______-pin interface
  • 23
  • 25
  • 232
  • 9
3
. One implementation of EIA-232 uses a _______-pin interface
  • 23
  • 25
  • 232
  • 9
4
. The number of pins, the cable length, and the pin configuration are _______ specifications of the EIA-232 interface standard
  • mechanical
  • electrical
  • functional
  • any of the above
5
. The voltage level and the signal type are _______ specifications of the EIA-232 interface standard
  • mechanical
  • electrical
  • functional
  • any of the above
6
. In its most popular implementation, the EIA-232 interface standard defines _______ wires for actual data transmission
  • 25
  • 21
  • 12
  • 4
7
. In the DB-25 implementation, the majority of the EIA-232 interface wires are used for _______
  • data transmission
  • control and timing
  • test mode
  • future assignment
8
. DB-25 and DB-9 are two implementations of the _______ standard.
  • EIA-232
  • EIA-449
  • EIA-530
  • X.21
9
. The _______ implementation of EIA-232 is often used in a single asynchronous connection
  • DB-37
  • DB-25
  • DB-9
  • X.21
10
. If two DTEs are to be connected directly, a _______ can be used
  • null modem
  • modem
  • repeater
  • bridging device
11
. In a null modem, the _______ pins are rewired so that DTEs can directly connect to each other
  • data transfer
  • set up
  • timing
  • all of the above
12
. A null modem has _______ connector(s).
  • one male and one female
  • two male
  • two female
  • only one
13
. The _______ interface standard specifies a 4000-feet transmission distance
  • EIA-232
  • RS-422
  • EIA-530
  • X.21
14
. _______ specifies two connectors, one with 37 pins and one with 9 pins
  • EIA-232
  • RS-422
  • EIA-449
  • X.21
15
. The _______ standard removed all functions relating to the secondary channel to a separate 9-pin connector
  • EIA-232
  • RS-422
  • EIA-449
  • X.21
16
. RS-423 and RS-422 are electrical specifications for _______.
  • EIA-232
  • RS-422
  • EIA-449
  • X.21
17
. RS-423 is a(n) _______ circuit specification with _______ line(s) for signal propagation
  • balanced; one
  • balanced; two
  • unbalanced; one
  • unbalanced; two
18
. RS-422 is a(n) _______ circuit specification with _______ line(s) for signal propagation.
  • balanced; one
  • balanced; two
  • unbalanced; one
  • unbalanced; two
19
. The data rate for RS-423 ranges from _______ Kbps to _______ Kbps.
  • 1; 10
  • 1; 100
  • 10; 100
  • 10; 1000
20
. The data rate for RS-422 ranges from _______ Kbps to _______ Mbps
  • 1; 10
  • 1; 100
  • 10; 100
  • 10; 1000
21
. RS-422 specifies two lines that carry _______
  • two identical signals
  • two signals, one the complement of the other
  • two different signals
  • none of the above
22
. _______ is an interface standard similar to EIA-449, but specifying the use of the DB-25 connector
  • EIA-232
  • RS-422
  • EIA-530
  • X.21
23
. _______ is an interface standard designed by the ITU-T
  • EIA-232
  • RS-422
  • EIA-530
  • X.21
24
. The maximum data rate of a half duplex ASK modem using a two-wire regular telephone line is ___________ bps
  • 1200
  • 2400
  • 3600
  • none of above
25
. The maximum data rate of a full duplex ASK modem using a two-wire regular telephone line is ___________ bps
  • 1200
  • 2400
  • 3600
  • none of above
26
. The maximum data rate of a full duplex ASK modem using four-wire regular telephone line is ___________ bps.
  • 1200
  • 2400
  • 3600
  • none of above
27
. The maximum data rate of a half duplex FSK modem using a two-wire regular telephone line with two carrier frequencies separated by 1000 Hz from each other is ___________ bps
  • 1400
  • 2400
  • 3600
  • none of above
28
. The maximum data rate of a full duplex FSK modem using a two-wire regular telephone line with two carrier frequencies in each direction separated 500 Hz from each other is ___________ bps
  • 1400
  • 700
  • 3600
  • none of above
29
. The maximum data rate of a half duplex 2-PSK modem using a two-wire regular telephone line is ___________ bps
  • 1200
  • 2400
  • 3600
  • none of above
30
. The maximum data rate of a half duplex 8-PSK modem using a two-wire regular telephone line is ___________ bps.
  • 1200
  • 2400
  • 7200
  • none of the above
31
. The maximum data rate of a full duplex 8-PSK modem using a two-wire regular telephone line is ___________ bps
  • 1200
  • 3600
  • 7200
  • none of above
32
. The maximum data rate of half duplex 64-QAM modem using a two-wire regular telephone line is ___________ bps
  • 4800
  • 9600
  • 14400
  • none of above

 
 
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