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Cable Math- Suggestions

Terms in this set (25)

Formula for cable loss
Footage x cable loss per foot
Formula for total loss
Cable loss + passive loss
Expected level
Starting level - total loss
What is ADMAS
ADD all like cables, DIVIDE the total footage by 100, MULTIPLY that number by the known cable losses, SUBTRACT total from starting signal
Of the two frequencies, 54MHz and 750 MHz, which attenuates more
Higher frequencies attenuate more than lower frequencies
For every 100ft of RG6 at 54MHz cable loss is
2dB
For every 100ft of RG6 at 750 MHz cable loss is
6dB
The difference between transmitted and received power from resulting from the loss through equipment, lines, and other transmission devices
Attenuation
The flow of signal upstream, from the customer's equipment to the headend
Return Path
Return Path frequency
5-42 MHz
Signal loss for 2-way splitter
4dB
Signal loss for a 4-way splitter
8dB
Signal loss for a 8-way splitter
12dB
Used to measure the level and quality of signal in a cable
SLM (Signal Level Meter)
A test instrument used to measure AC and DC voltage, current, and resistance in ohms
Volt Ohm Meter (VOM) Or Digital Multimeter (DMM)
Used to test cables and coax, AC Power, and batteries
VOM or (DMM)
Used to detect egress
Leakage detector
Used to check the presence of low voltage
Polarity Test
Traps or filters that block a channel or channels from being received by cable TV customer
Negative Trap
Positive traps that remove an interfering carriers rom a channel that a customer wants to receive
Positive Trap
Optical power is expressed in this measurement
dBm (or decibels referenced to 1 milliwatt(mW))
0DBm equals this many mW?
1mW
If an amplifier increases the power level by 10 times, the amplifier has a gain of this?
10dB (The rule of 10s)
More power out than in is referred to as.
Positive Gain
Less Power out than in is referred to as.
Loss
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