Exam (elaborations)
SPECTRUM FIELD TECH QUESTIONS AND ANSWERS
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SPECTRUM FIELD TECH QUESTIONS AND ANSWERS
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SPECTRUM FIELD TECH QUESTIONS AND ANSWERSCurrent/ amperage - Answers-Flow or movement of electric charges
Resistor - Answers-a passive two-terminal material that impedes the flow of current
What is the most common workplace hazard involving electricity? - Answers-Electrical
shocks
What is minimum approach distance? - Answers-The shortest safe distance to keep
from energized conductors
CATV at the pole - Answers-40''
CATV at the mid-span - Answers-24''
CATV at the house - Answers-12''
Live parts of electric equipment must be guarded against at how many volts? - Answers-
50 volts
What are the 2 kinds of grounds required by Safety standards for electrical systems? -
Answers-Service and Equipment
How many programming channels can digital signals have within a 6 MHz space? -
Answers-12
CLI - Answers-Cumulative Leakage Index
What are charters technical standard for 256 QAM and OFDM carries at CPE? -
Answers-34 dB or better
BER - Answers-bit error rate
Post BER - Answers-1.0e-9
Pre BER - Answers-1.0e-6
FEC - Answers-Forward Error Correction
SLM - Answers-Signal Level Meter
CNR - Answers-Carrier to Noise Ratio
Hum Modulation - Answers-The amplitude distortion of broadband cable video and
audio carriers by 60 Hz or 120 Hz voltage
, What are the two types of hum modulation? - Answers-Video and audio
Digital= - Answers-Rate data bitstream
Analog= - Answers-Concentrated at a single frequency
How much bandwidth is required to transmit digital signal data? - Answers-6 MHz
The wider the digital signal the more? - Answers-Power
Higher BER can be caused by? - Answers-Ingress
Distortion
Noise
Interference
Hum
Reflection
Spaced errors - Answers-Errors that are spread out because of noise
Burst errors - Answers-Errors that are grouped together because of intermittent
problems such as ingress or loose connectors
FEC - Answers-Generates and introduces additional bits as data is transmitted
Uncorrectable FEC errors are caused by: - Answers-Impulsive noise or ingress
interference
Loose or intermittent connections
A faulty modem
MER - Answers-A measurement used to quantify the performance of communications
system transmitting a digital signal
Industry acceptable MER values for QPSK - Answers-~24dB
Industry acceptable MER values for 64-QAM - Answers-~27dB
Industry acceptable MER values for 256-QAM - Answers-~31dB
Voltage - Answers-Measurement of the force or pressure that electrons to move
1v equals what? - Answers-1 current of 1 ampere through a resistance of one ohm
Current are measured in what? - Answers-Amperes
Resistance - Answers-The opposition a material offers to the flow of current
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