**Friday Nov 1, 2013 questions** Flashcards
Made of a silica glass and is roughly the size of a human hair.
Fiber Optic Cable
Performs the same splitting or combing function as an RF splitter but they do it at the light wave level.
Optical splitters / combiners
Allows multiple wavelengths, above and below a center wavelength, to be carried on a single optical fiber.
Dense Wave Division Multiplexing
What are the three most common types of Laser Transmitters?
Fabry-Perot (F-P), Distributed Feedback (DFB), Yttirum-Aluminum-Garnet (YAG)
oden - word jumble
node
fwrmoeav - word jumble
waveform
lxpide trelif
diplex filter
What is the clearance for power at the mid-span?
24 inches
What does Article 820 of the National Electrical Code refer to?
The minimum requirements of all aerial drops.
With only cable on the pole, how many inches to the left and right of the center of the pole should the straps and spacers be placed?
14 inches
How is the vertical deflection of an oscilloscope measured?
Volts per division.
What level of DC voltage would you expect to find at an amplifier DC test point?
Between 24 - 28VDC
When testing batteries in a standby power supply, the difference in voltage levels should be no more than how many VDC?
0.3 VDC
Which 2 wires transmit using the T568A standard?
white green, green
How many test points are required by the FCC for every 45,000 customers?
9
What frequency range must a spectrum analyzer have in order to align satellite dishes?
950MHz - 1450MHz
For high resolution traces, how many sweep points may be entered for each 6MHz segment of bandwidth?
Up to 3
What is the minimum/maximum level of a leak that must be fixed within 72 hours?
20-149 uV/M
What is the term used to define an electrical process that combines several individual signals into a single medium?
Multiplex
What is the forward bandwidth that must be supported by all active and passive equipment?
54 MHz to 1,002 MHz
If the input level (in dBmV) numerically equals an amplifier’s noise figure, what will the output C/N be?
59.2 dB (+/-.5db)
What transmitter component changes RF signals to pulses of light?
Semiconductor Laser Diode
At 64 Kbps, what is the sample rate per second in the G.711 PCM encoding scheme?
8,000 per second
Relative to time and “eye lead time,” how far in advance is the recommended scan while driving?
12 to 15 seconds
What is the term for the peak value of an AC waveform?
Amplitude
What is the formula to determine wavelength?
Frequency divided by the Speed of Light
What is the web address to access the configuration screens for the Business Internet gateway?
http://IPAddress:8080
In a typical on-hook state, what is the level of ring wire voltage?
-48V
In a typical off-hook state, what is the level of tip wire voltage?
-20V
What is the frequency range typically applied to ring voltage?
20-25 Hz
How does bonding limit potentially lethal voltage that may be present on the drop cable from external sources?
Through equalization of potential between Comcast services and other utility services at the home