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SPECTRUM FIELD TECHN ICIAN 1
TEST CORRECTLY ANSWE RED
ALREADY PASSED
Question :Upstream frequency ranges
Correct answer:between 5Mhz and 42Mhz
Question :Downstream frequency ranges
Correct answer:Between 50MHz 860MHz
Question :Upstream frequency ranges
Correct answer:5MHz and 42 MHz
Question :A 6 MHz downstream channel can hold
Correct answer:2-4 hd channels or 8-12 standard
definition channels
Question :Egress
Correct answer:When a signal leaks out of a cable
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Question :Ingress
Correct answer:when a signal leaks into a cable
Question :Field technicians are responsible from
Correct answer:The tap to the CPE (customer premise
equipement)
Question :The most preferred BER is measured in
________ and is shown as _______
Correct answer:Billions, 1.0E-09
Question :The headend
Correct answer:Is the master facility for distributing
signals over a cable television system
Question :Charter passing modem receive levels (Rx)
Correct answer:between -10dBmv and +12dBmv
Question :Charter passing modem transmit levels (Tx)
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Correct answer:between 35dBmv and 50dBmv
Question :Charter passing MER
Correct answer:35dBmv
Question :HD channels
Correct answer:around 10Mbps each
Question :standard definition channels
Correct answer:around 3-4Mbps each
Question :QAM (qaudarature apmlitude modulation)
Correct answer:two amplitude modulated waveforms at
the same frequency that are phase shifted by 90 degrees
Question :QPSK (qaudrature phase shift keying)
Correct answer:16 QAM, 64 QAM, and 256 QAM are all
exapmles of QAM modulation.
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Question :RF loss or gain
Correct answer:is a relative measurement and is measured
in dB (decibels)
Question :RF measurements that are read from a meter
are
Correct answer:absolute measurements and are measured
in dBmV (decibels per millivolts)
Question :Analog signal loss
Correct answer:is often gradual and reduces signal slowly
Question :Digital signal loss
Correct answer:sudden where very small margin exists for
difference between a good picture and no picture (called the cliff effect)
Question :FM radio stations
Correct answer:found between frequencies 88 MHz and
108 MHz