Grade 16
A flat loss plug-in used to ensure the RF input levels to the preamplifier hybrid (gain stage) are equal at all identical amplifiers (unity gain) regardless of amplifier spacing.
"pads" or attenuator (check)
What should the light level be at 1310nm at a Phillips node at normal operating level (output)?
0 to -1 dBm
If a 3.2MHz upstream channel is using 16 QAM with a configured symbol rate of 2.560 millions of symbols per second (MS/s), what is the raw data rate on this channel?
10.24 Mbps
A section of coaxial cable is 200 feet long feeding an 8-way splitter at the customer location. Assume that the coaxial cable has an attenuation of 5.5 dB per hundred feet at 752 MHz. What would be the approximate dB attenuation at the splitter's output port at 752 MHz?
22.5 Had gotten it right (Check)
Which statement is true about clearances at the pole?
40 inches from primary power and 12 inches from telephone line
A directional coupler 9 (DC-9) with an input of 15dBmV has a tap port output of ___ dBmV.
6 dBmV
What is the name of the component used to establish the band split of an amplifier?
????? (check) gotten it right
What type of devices are HFC amplifiers?
Active devices
What does Link Loss mean?
Attenuation from point to point for optical links based upon wavelenghts and optical footage (check)
What causes reflections in the outside plant?
Channel override and high noise (check)
What does CLI stand for?
Cumulative Leakage Index
Which two powering architectures are commonly used in coaxial cable networks? (Choose 2)
Distributed Power (used by Cablevision one or more supplies per node) and Centralized Power ( one supply multiple nodes)
What is it called when a break in the coax cable shield allows signals to leak out?
Egress
Who is responsible for the calibration and maintenance of all PPE?
Employee
The rounder or more circular the cable end is, the harder it is for the coring tool to enter the cable to begin coring.
False (check)
In a fiber the light travels down?
Glass (Check)
What are the FCC frequencies in the High-Band radio spectrum?
High-Band is 174 to 216MHz
Refer to the diagram and select the housing to housing connector.
Housing to housing connector
What are the FCC frequencies in the Hyper-Band radio spectrum?
Hyper-Band is 300 to 456MHz
An amplifier has an input signal of 0.3 milliwatts (mW) and produces an output of 1 milliwatts (mW). What is the dB gain?
I think its "0" (check)
How does the "Arcom Digital Signal Leakage System" avoid false leakage detections
It processes QAM samples and correlates between sampled signal and signal received
Passively combines RF signals with up to 90 vAC from a line power supply:
Line Power Inserter or Power inserter
What are the FCC frequencies in the Low-Band radio spectrum?
Low-Band is 54 to 88MHz (check)
What are the FCC frequencies in the Mid-Band radio spectrum?
Mid-Band is 120 to 174MHz
The "Tap Expert" on the adaptive equalizer of the VeEX CX380 meter displays the measurements in the picture below (Est. EQ Stress, Est. Un-EQ MER, Est. EVM, and Est. Echo Margin). These measurements can be used to?
Provide an early indication that the system might have marginal performance issues (check)
When testing a QAM signal for constalation impairment (MER. BER, PRES, etc...) with the VeEX meter it is important to make sure that _________ is achieved before recording the measurement.
QAM Lock
Refer to the diagram and select the splice connector.
Splice connector
What are the FCC frequencies in the Sub-Band radio spectrum?
Sub-Band is 7 to 49MHz
What are the FCC frequencies in the Super-Band radio spectrum?
Super-Band is 216 to 300MHz
The constellation display of a digital carrier on the VeEX Meter graphically represents?
The constellation (check)
What is the guideline for coaxial bending radius?
The maximum bend radius is 5 times the cables diameter (check)
What are the FCC frequencies in the Ultra-Band radio spectrum?
Ultra-Band is 456 to 1002MHz (check)
A cable design philosophy for amplifier spacing in the forward path, where the total loss of the amount of coax cable and other flat loss passive devices in the network before an amplifier will equal the gain of the amplifier.
Unity gain
75 ohms is the characteristic impedance of coaxial cable used in CATV, 1 mV signal across this impedance is equal to:
Zero dBmV
At what point in a cable operator's network can RF leakage occur?
anywhere from the node to the home
On non-level roadways it is helpful to__________. This reduces the chance of the bucket truck moving while working on the aerial plant.
chuck wheels or turn wheels to the curb
What is a single fiber made of?
core(glass),cladding,coating,strengthening fibers and cable jacket
What is the difference between dB and dBmV?
dB is a ratio with no specific unit of measure while dBmV is a specific signal level measured across a specific resistance(75 ohms)(check)
What is the frequency for the 2-way cable configuration of the high-split?
high-split is 5 to 200MHz
How does Effigis help to improve performance and reliability of our HFC network?
it penetrates any open in the system and helps repair ingress (check)
Which is the correct assessment of the display screen?
look at image
Which of the following best describes the upstream SNR graphed below?
look at image
What is the primary cause of Cumulative Leakage Index, or CLI problems in the cable network?
loose RF connectors,defective cable shields or equipment with compromised shielding
What is the frequency for the 2-way cable configuration of the mid-split?
mid-split is 5 to 85 MHz
What factors usually contribute to poor upstream CNR?
noise level increases
What is the frequency for the 2-way cable configuration of the sub-split?
sub-split is 5 to 42 MHz
A DOCSIS return path uses a sub-split, which will produce a return path spectrum of:
sub-split is 5 to 42MHz
The log (to the base 10) of 1000 is:
the answer is 3 or 10^3 (check)
What is the frequency for the 2-way cable configuration of the top-split?
top-split is 900 to 1050MHz
According to the DOT, it is unlawful to have __________propane tanks in your truck.
unproperly stored