Analog Signals vs Digital Signals

Question 1

Name a type of noise that develops from the voice transmission itself

Answer 1

echo

Question 2

the signals found on many local loops would be a combination of _______and _______ signals

Answer 2

analog and digital

Question 3

the signals for making a telephone connection are referenced as ______signals or ________signals

Answer 3

control or supervisory

Question 4

name three signals that indicate a calling or called telephone

Answer 4

busy tone
dial tone
key tone
dial pulse

Question 5

Clear speech is contained best in a band or frequencies between _______ and _______ HZ

Answer 5

200 and 4000

Question 6

the range of frequencies for telephone circuits are said to be in the __________

Answer 6

pass band

Question 7

________pass bands are limited to 300 HZ to 3000Hz. this signal is called a _______.

Answer 7

voice

inbound

Question 8

what is the equation for expressing the signal power deliered to a load

Answer 8

DB = 10 log 10

Question 9

what does dBm stand for

Answer 9

decibel per milliwatt

Question 10

list three contributions to the degradation of a transmission system when information is being distorted

Answer 10

powerline
lightning
maintenance

Question 11

a plan called ________ was devised so that a transmission path can carry many telephone conversations at the same time

Answer 11

multiplexing

Question 12

Why are telephone system designs changing toward a digital network

Answer 12

low cost
low power
long term reliability

Question 13

_____electronics are becoming more cost effective than _____

Answer 13

DIGITAL

ANALOG

Question 14

multiplexing is ____________ with digital transmission

Answer 14

easier

Question 15

are mixed signals an advantage or disadvantage with digital transmission

Answer 15

advantage

Question 16

digital hardware operates on _____ voltages and currents, and is susceptible to signal ________ from existing high voltage equipment

Answer 16

low

spikes

Question 17

The system that allows digital and analog interfacing is known as ____________

Answer 17

BORSCHT

Question 18

what does BORSCHT stand for

Answer 18

battery feed
over voltage protection
ringing
signaling
coding
hybrid
test

Question 19

what does SLIC stand for

Answer 19

subscriber line interface card

Question 20

is increased bandwidth an advantage or disadvantage for digital transmission

Answer 20

disadvantage

Question 21

how can you avoid large timing diferences

Answer 21

sync data stream and clock

Question 22

what does bit stand for

Answer 22

binary digit

Question 23

what does PAM stand for

Answer 23

pulse amplitude modulation

Question 24

what does PCM stand for

Answer 24

Pulse code modulation

Question 25

quantization causes

Answer 25

background noise in the receier

Question 26

why is synchronous transmission more effective than asynchronous transmission

Answer 26

adding combinations of start and stop bits

Question 27

what telephone switching system is dedicated to one customer for their inner exchange

Answer 27

PBX

Question 28

how is a PBX connected to the central office

Answer 28

trunks

Question 29

for each phone connection to the PBX communication system is called a _______ and usually has three or four digit extensions

Answer 29

station