SPECTRUM FIELD TECH
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
Power - ANSWERS-The rate at which work is done. Measured in watts
1 watt= what? - ANSWERS-1V X 1AMP
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
Power - ANSWERS-The rate at which work is done. Measured in watts
1 watt= what? - ANSWERS-1V X 1AMP
