Analog Signals vs Digital Signals Flashcards
Name a type of noise that develops from the voice transmission itself
echo
the signals found on many local loops would be a combination of _______and _______ signals
analog and digital
the signals for making a telephone connection are referenced as ______signals or ________signals
control or supervisory
name three signals that indicate a calling or called telephone
busy tone
dial tone
key tone
dial pulse
Clear speech is contained best in a band or frequencies between _______ and _______ HZ
200 and 4000
the range of frequencies for telephone circuits are said to be in the __________
pass band
________pass bands are limited to 300 HZ to 3000Hz. this signal is called a _______.
voice
inbound
what is the equation for expressing the signal power deliered to a load
DB = 10 log 10
what does dBm stand for
decibel per milliwatt
list three contributions to the degradation of a transmission system when information is being distorted
powerline
lightning
maintenance
a plan called ________ was devised so that a transmission path can carry many telephone conversations at the same time
multiplexing
Why are telephone system designs changing toward a digital network
low cost
low power
long term reliability
_____electronics are becoming more cost effective than _____
DIGITAL
ANALOG
multiplexing is ____________ with digital transmission
easier
are mixed signals an advantage or disadvantage with digital transmission
advantage
digital hardware operates on _____ voltages and currents, and is susceptible to signal ________ from existing high voltage equipment
low
spikes
The system that allows digital and analog interfacing is known as ____________
BORSCHT
what does BORSCHT stand for
battery feed over voltage protection ringing signaling coding hybrid test
what does SLIC stand for
subscriber line interface card
is increased bandwidth an advantage or disadvantage for digital transmission
disadvantage
how can you avoid large timing diferences
sync data stream and clock
what does bit stand for
binary digit
what does PAM stand for
pulse amplitude modulation
what does PCM stand for
Pulse code modulation
quantization causes
background noise in the receier
why is synchronous transmission more effective than asynchronous transmission
adding combinations of start and stop bits
what telephone switching system is dedicated to one customer for their inner exchange
PBX
how is a PBX connected to the central office
trunks
for each phone connection to the PBX communication system is called a _______ and usually has three or four digit extensions
station
