143
Test IT I on Chapters 1&2 (Even)
Total points =70
1.
The
a. telephone
b. telegraph
c. computer
d. calculator
e. processor
was a device designated to print patterns at a distance.
2.
The FCC has jurisdiction over the use of
United States.
a. bandwidth
b. transmission channel
c. frequency above kHz range
d. radio waves
e. electromagnetic spectrum
3.
A
handles local telephone calls while a
distance telephone calls.
a. LEC, IXC
b. IXC, LEC
c. LEC, AT&T
d. IXC, AT&T
e. AT&T, MCI
4.
For analog devices, bandwidth is expressed in
devices bandwidth is expressed in
.
a. Hz, bps
b. bps, Hz
c. Hz, cycles per second
d. cycles per second, Hz
e. cycles per second, bps
5.
Automatic Number Identification is the capability of a local switching office to
.
a. provide equal access to all IXCs
b. support digital services
c. automatically identify the calling station
d. provide two-wire line-side access to subscribers
e. All of the above
for communications in the
1
handles long
, while for digital
6.
Most data communication use
a. bandwidth
b. broadband
c. baseband
d. asynchronous
e. synchornous
transmission.
7.
The
a. POP
b. RBOC
c. LATA
d. ANI
e. PIC
8.
Efficiency of transmission is the ratio of
a. total number of bits to the actual message bits
b. actual message bits to the total number of bits
c. overhead bits to the total number of bits
d. overhead bits to the actual message bits
e. actual message bits to the overhead bits
9.
The Intra-LATA access provided by the
provided by the
.
a. LEC, IXC
b. IXC, LEC
c. LEC, LEC
d. IXC, IXC
e. POP, POI
10.
A serial-to-parallel conversion is accomplished by a(n)
a. IC
b. EBCDIC
c. ASCII
d. UART
e. modem
11.
The typical geographic expanse of a
is more than 50 km.
a. LAN, MAN
b. LAN, WAN
c. MAN, WAN
d. ring, star
e. star, ring
represents the point where the LEC and IXCs are interconnected.
.
and the Inter-LATA access is
.
is less than 5 km while that of a
2
12.
transmission has replaced
PSTN except the telephone local loop.
a. Analog, digital
b. Digital, analog
c. Digital, serial
d. Serial, parallel
e. Parallel, serial
transmission in most parts of the
13.
A
topologies.
a. mesh
b. tree
c. hybrid
d. bus-star
e. ring-star
14.
Noise power is directly proportional to
a. transmission time, bandwidth
b. bit error rate, temperature
c. bit error rate, bandwidth
d. bit error rate, transmission time
e. None of the above
15.
A
a.
b.
c.
d.
e.
16.
The SNR at the amplifier output is 15.5dB and the SNR at the amplifier input is 10dB.
The noise figure of the system is
.
a. 25.5 dB
b. 5.5 dB
c. 2.75 dB
d. 12.75 dB
e. None of the above
17.
Thin-client architecture is an example of
a. centralized
b. client/server
c. distributed
d. n-tier
e. virtual
network topology is a combination of two or more basic network
and
.
network used encrypted tunnels that forward over data the shared media.
circuit switching
message switching
public
private
virtual
computing.
3
18.
a.
b.
c.
d.
e.
is a means of controlling the characteristics of a signal in a desired way.
Multiplexing
Demultiplexing
Modulation
Demodulation
All of the above
19.
A
source.
a. UPS
b. CORBA
c. APS
d. RAID
e. ATM
is a device whose battery kicks in after a loss of power from the primary
20.
The undesirable bleed-over between adjacent channels is commonly referred to as
.
a. noise
b. crosstalk
c. modulation
d. frequency deviation
e. Fourier index
21.
The OSI model (for data communication) has been adopted by the
a. FCC
b. IEC
c. ANSI
d. ISO
e. USNC
22.
Find the bit rate if the band rate is 2400 and there are six bits per symbol.
a. 400 bps
b. 1800 bps
c. 9600 bps
d. 1440 bps
e. None of the above
23.
The
are proprietary standards set by large companies.
a. national standards
b. de facto standards
c. telecom standards
d. ECTRA and OSI
e. OSI and USENET
4
.
24.
Analog-to-digital conversion consists of three stages in this order:
a. sampling, low-pass filtering, conversion to digital
b. low-pass filtering, sampling, conversion to digital
c. conversion to digital, low-pass filtering, sampling
d. sampling, conversion to digital, low-pass filtering
e. conversion to digital, sampling, low-pass filtering
25.
is the most commonly used method of coding digital signals and
transmitting analog signals digitally.
a. Pulse Amplitude Modulation
b. Pulse Position Modulation
c. Pulse Code Modulation
d. Pulse Width Modulation
e. Quadratic Amplitude Modulation
26.
For voice transmission, the analog signal must be sampled at
a. twice its highest frequency
b. 8 kHz
c. 8000 times every second
d. All of the above
e. None of the above
27.
.
is predominantly used in analog communications.
a.
b.
c.
d.
e.
TDM
STDM
FDM
WDM
DWDM
28.
_______________ is a cost-effective way to increase the capacity of fiber optic
communications.
a. TDM
b. STDM
c. FDM
d. WDM
e. None of the above
29.
Identify one international and one national telecom organization or regulating agency
(spell out the name) that plays a major role in developing standards. (3 points)
International ___________________________________________________________
National ______________________________________________________________
5
30.
Explain how one gets the T-1 rate of 1.54 Mbps based on modulation/multiplexing
calculations. (4 points)
31.
Calculate the Bit Error Rate if there were six bad bits in a total transmission of 10,000 bits.
(2 points)
32.
A receiver produces a noise power of 200 mW with no signal. The output level increases to
5 W when a signal is applied. Calculate the signal-to-noise ratio in decibels. (3 points)
33.
Find the transmission bit rate if the baud rate is 2400 and there are two signal transitions
per symbol. (2 points)
6