How do you convert dB to KM?
Estimate Fiber Distance Fiber length = {[(-8.0dB) – (-34.0dB)] – [0.1dB × 5] – [0.75dB × 2] – [3.0dB]} / [0.4dB/km] = 62.5km. In this example, an estimated 62.5 km.
What does dB km stand for?
Optical losses of a fiber are usually expressed in decibels per kilometer (dB/km).
How do you convert dB to energy?
The power P2 is equal to the reference power P1 times 10 raised by the gain in GdB divided by 10.
- P2 = P1 ⋅ 10(GdB / 10)
- A2 = A1 ⋅ 10(GdB/ 20)
- Vout = Vin⋅ 10 (GdB / 20) = 5V ⋅ 10 (6dB / 20) = 9.976V ≈ 10V.
How far can 12 dBi reach?
Know that on a low-speed device, 24 dBi is 26.2km, 14 dBi is 19km, 12 dBi is 17.3km, 10 dBi is 15.8km and 7 dBi is 14.1km.
What is dB in optical fiber?
dB (decibel) In the case of fiber optic cable, we are comparing the power injected at one end of the cable to the power received at the other end.
How do you read OTDR results?
How to Read Your Trace. OTDR displays will show a Y and X axis. The X axis measures distance, and the Y axis measures attenuation and reflection in dB. Before running your trace, select the appropriate fiber network length, pulse width and acquisition time.
Is Base 10 a dB?
The base-10 logarithm of the ratio of the two power quantities is the number of bels. The number of decibels is ten times the number of bels (equivalently, a decibel is one-tenth of a bel). P and P0 must measure the same type of quantity, and have the same units before calculating the ratio.
What does 9dBi mean?
Antenna Basics
| Antenna | Type | Signal use |
|---|---|---|
| 9dbi | Omni directional | Receive/transmit |
| 9dBi Panel | Directional | Receive/transmit |
| 11dBi | Omni directional | Receive/transmit |
| 14dbi | Omni directional | Receive/transmit |
What is good dB for fiber?
The range they measure will be determined by the output power of the source in the unit and the sensitivity of the detector. For multimode fiber, an OLTS using a LED source will usually measure over a range of 0-30 dB, more than adequate for most multimode cable plants which are under 10 dB loss.
Is base 10 a dB?
How do you find 10log10?
A logarithmic function is a function that is the inverse of an exponential function. The purpose of the logarithm is to tell us about the exponent….Logarithms.
| 100=1 | Log10(1) = 0 |
|---|---|
| 102 =100 | Log10(100) = 2 |
| 103 =1,000 | Log10(1,000) = 3 |
| 104 =10,000 | Log10(10,000) = 4 |
| 105 =1,00,000 | Log10(1,00,000) = 5 |
What is a log in math?
log: (in math) An abbreviation for logarithm. logarithm: The power (or exponent) to which one base number must be raised — multiplied by itself — to produce another number. For instance, in the base 10 system, 10 must be multiplied by 10 to produce 100. So the logarithm of 100, in a base 10 system, is 2.