SPECTRUM DESIGNER 1 -> 2 TEST PREP QUESTIONS & ANSWERS (RATED A+)
The process of combing digital services in the headend is called: - ANSWER-
Multiplexing
What technologies are defined in DOCSIS 4.0 to help sustain the Hybrid fiber/coaxHFC network infrastructure for several more years? - ANSWER-Full Duplex DOCSISFDX and Extended Spectrum DOCSISESD.
How can a less-experienced technician identify what non-standard symbols on the network design maps represent? - ANSWER-The legend at the bottom of the network design map that defines the map symbols, cable types, and amplifier data.
How can a distribution amplifier be identified in the network or on a network design map? - ANSWER-The distribution amplifier has multiple downstream outputs
What test instrument sends out a test signal and displays any reflections caused by impedance mismatches in the cable that are characteristic of cable faults? - ANSWER-
Time domain reflectometerTDR
What is required for checking the physical network integrity when maintaining the coaxial cable network? - ANSWER-Being observant and performing some minor tasks while engaged in regularly scheduled activities
When opening a distribution amplifier station housing, why is it usually unnecessary to loosen the bolts at the bottom of the housing? - ANSWER-The housing lid is usually attached to the base of the housing with hinges.
Shorts in the coaxial cable and excessive amounts of current can damage the distribution amplifier. Several devices can be used to protect the distribution amplifier from these problems. Which device shorts to ground when an overvoltage situation occurs? - ANSWER-A fast transfer electronic crowbar (FTEC).
What is the basic amplifier application that increases the amplitude of the radio frequency (RF) signal to compensate for the signal loss of cable and passive devices preceding the amplifier called? - ANSWER-Unity gain. How does a distribution amplifier in a fiber node receive the downstream radio frequency (RF) signals? - ANSWER-Through a coaxial cable that is connected to the downstream optical receiver.
What is the purpose for distribution amplifiers in a hybrid fiber/coax (HFC) network? - ANSWER-Boost the downstream signals before being divided and circulated throughout
neighborhoods in the coaxial cable portion of the network.
What does a thermal control circuit in a distribution amplifier do? - ANSWER-It maintains the amplifier output levels as the input levels vary with temperature changes.
Why is there a diplex filter at each downstream output port in a distribution amplifier? - ANSWER-To separate the downstream radio frequency (RF) from the upstream RF signals.
What is used to select which distribution amplifier secondary downstream output ports are active and whether they have equal or unequal output levels? - ANSWER-Plug-in modules or jumpers.
Where does a distribution amplifier module receive the direct current (DC) required for operation? - ANSWER-From a DC power supply module that converts the alternating current (AC) voltage to DC voltage.
Describe an application for a distribution amplifier in a hybrid fiber/coax (HFC) network? - ANSWER-To maintain downstream amplitude levels to the addresses farthest from the
fiber-node.
In a distribution amplifier, why is the frequency response at the input of the second output stage sloped? - ANSWER-To reduce intermodulation distortion levels caused by amplifying high amplitude input levels.
Why is the term "gain control" applied to amplifier gain and controls inaccurate? - ANSWER-The only way to vary the output of any amplifier is to adjust the amplitude level of the signal going into the amplifier.
How is the AC voltage separated from the RF signal in a distribution amplifier? - ANSWER-???By a capacitor that passes RF but blocks the low frequency 60 hertz (Hz) AC voltage which finds a low resistance path through the RF choke that blocks RF.????
What is the expected DC voltage on most hybrid fiber coax (HFC) network equipment? -
ANSWER-+24 VDC, +_ 0.5V
What term describes the frequency spectrum into an amplifier having higher amplitude at low frequencies than the high frequencies? - ANSWER-Negative tilt.
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