CT4 Leakage 16 Flashcards
What is LTE
Long-Term Evolution
LTE operates in
700 MHz to 800 MHz frequency range
The FCC specifies the following signal leakage limits
Less than 54 MHz,No more than 15 microvolts per meter @ 30 meters
More than 216 MHz,No more than 15 microvolts per meter @ 30 meters
Between 54 MHz and 216 MHz,No more than 20 microvolts (μV/m) @ 3 meters
cable operator arrives at a cumulative (average-weighted) score. The pass/fail score is
64
CLI test is conducted annually and may be one of the following:
Ground-based
By an aerial “flyover”
Leakage logs must be kept on file for at least
two years
the FCC requires cable operators to file an annual CLI calculation, using Form
Form 320
During a flyover, an airplane flies over the system, measuring any detectable leaks. This is done at an altitude
1500 feet
Define CLI
A figure of merit derived mathematically from the number and severity of signal leaks in a cable system
What year was FCC established
1934
What caused the FCC to start proceedings to establish new rules.
In 1976, signal leaking from a cable system in Harrisburg, PA, interfered with air traffic communication
what environmental factors affect leakage
temperature, lightning, static electricity, UV rays, solar emissions,