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NCTI MT1-MT2 QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+
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NCTI MT1-MT2 QUESTIONS WITH VERIFIED ANSWERS ALREADY GRADED A+
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Name: Score:130 Multiple choice questions
Term 1 of 130
How is laser clipping in the return path characterized on a spectrum analyzer?
By an elevated noise floor above 42 MHz after the optical signal has been converted
back to RF typically in the headend.
They can be modulated at the maximum order of modulation for a given bandwidth that
is suitable for the condition of the network.
The calculated difference between the configured Input and the received input.
To route the forward and return signals over different circuit paths to the appropriate
section so that they can be amplified separately.
Term 2 of 130
When a laser light source is used to test fibers,
At the output of a forward amplifier because the forward levels are highest and the
return levels are lowest.
The meter's calibration must be traceable to the National Institute of Standards
Technology (NIST).
By an elevated noise floor above 42 MHz after the optical signal has been converted
back to RF typically in the headend.
A 2 kHz modulation provides a test signal that allows the fiber under test to be detected
by an optical fiber identifier.
,Term 3 of 130
House amplifiers with a passive return path are used for what type of situation?
Impulse noise will appear as random spikes of energy across the entire return path
frequency spectrum (5 to 42 MHz).
For situations when long service drops are used and the forward path needs to be
amplified but return path amplification is unnecessary.
To route the forward and return signals over different circuit paths to the appropriate
section so that they can be amplified separately.
Baseline sweep responses that are used to balance and sweep all the amplifiers serviced
by that fiber-node.
Term 4 of 130
What recourse do broadband cable operators have if citizens band (CB) and ham radio signals
ingress into their network?
Low value taps have less isolation between ports and offer less attenuation to ingress and
impulse noise coming from an individual drop system.
None, as long as the radio transmissions are at or below legal power levels, it is the cable
operator's obligation to prevent these signals from entering their network.
Between active return carriers only if there is adequate space to accommodate the
bandwidth of the injected sweep pulses.
To route the forward and return signals over different circuit paths to the appropriate
section so that they can be amplified separately.
Term 5 of 130
Which type of rectifier circuit uses two alternating current (AC) waveforms on the transformer
secondary?
The antenna must be placed 3 meters from the system components and 3 meters from
the ground.
A full-wave rectifier with a center-tapped transformer secondary.
The narrow bandwidth and quadrature phase shift keying (QPSK) modulation.
To eliminate interference generated by the spectrum analyzer itself.
,Term 6 of 130
Why is 38 MHz typically the highest frequency in the sub-band frequency that is used for
upstream modem transmissions?
Some combination of higher transmit power, more sensitive receivers, and lower path
loss.
The upper edge of the sub-band frequency spectrum is prone to group delay caused by
the duplex filters.
They can be modulated at the maximum order of modulation for a given bandwidth that
is suitable for the condition of the network.
That there are high micro-reflections and that the cause is near the modem, likely in the
drop system.
Term 7 of 130
Optical power meters used for testing fiber-to-the-user (FTTX) installations operating
downstream from the headenc should be calibrated for which wavelengths?
1.6 mhz.
1,310 nm, 1,610 nm, and 1,777 nm.
1,490 nm, 1,550 nm, and 1,577 nm.
1,310 nm, 1,490 nm, and 1,625 nm.
Term 8 of 130
When aligning the optical return path, what are the ideal characteristics of the test signal
injected into the upstream optical transmitter?
Proof of good engineering practices and that test procedures are documented
It stores energy in its magnetic field with the current lagging the voltage by 90 degrees.
The value of the attenuator pad at the input of the STB demodulator.
A noise signal of the same bandwidth to be used for upstream transport
, Term 9 of 130
What is it necessary in the optical return path to get the most performance from the DOCSIS 3.1
specification?
To compensate for variable amounts of attenuation in the return path of each device.
Some combination of higher transmit power, more sensitive receivers, and lower path
loss.
The antenna must be placed 3 meters from the system components and 3 meters from
the ground.
Notify the power company with the exact location so the cause of the interference can
be repaired.
Term 10 of 130
What is the maximum allowable signal detectable in the airspace during a flyover?
20 uv/m.
10 uv/m.
112 uv/m.
11 uv/m.
Term 11 of 130
What should be done about injected test carriers at the node appearing at the transceiver in
the headend with frequency response variations of less than 1 dB?
The larger the duty cycle, the higher the voltage.
To eliminate interference generated by the spectrum analyzer itself.
Notify the power company with the exact location so the cause of the interference can
be repaired.
These variations are normal and Can Usually be disregarded,
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