Attenuation is a reduction in signal strength during transmission, such as when sending data collected through automatic monitoring. Attenuation is measured in decibels (dB), which is **ten times the logarithm of the signal power at a given input divided by the signal power at an output of a given media**.

Contents

- What is 10 dB attenuation?
- What is 3dB attenuation?
- Why is attenuation measured in dB?
- What is dB formula?
- What means dB?
- What is dB in cable?
- What does it mean 20 dB?
- What is dB power?
- What is dB in filter?
- Why is power expressed in dB?
- What is dB in radio frequency?
- What is dB loss in fiber optics?
- Why is dB used?
- How much reduction is dB?
- What is the value of 1 dB?
- How does dB work?
- What does negative dB mean?
- What is dB loss in RF?

Note that for the power ratio, for a cable with 10dB of attenuation **only 10% of the transmitted signal is received on the other side**.

The -3dB point is at the beginning of the attenuation. Frequencies beyond that are attenuated at 20 dB per frequency decade (per pole) beyond the -3 dB frequency. (Assuming a low pass filter) Actually -3dB means that **half of _this_frequency_ of the signal is power attenuated**.

Signal strength is measured in decibels **because signals are a form of radiation**. They are emitted in frequency and also have amplitude. Therefore, they are measured in decibels, which is also the unit used to measure sound intensity.

A smaller unit, decibel or dB, is usually used. 10 decibels equals one bel. Power ratio 10:1 – 1 Bel – = +-10 dB; a ratio of 100:1 = 2 Bels = 20 dB. So becomes the formula. **Decibels (dB) = 10 log(P2/P1)**

What does decibel (dB) mean? A decibel (dB) is **a unit used to measure the strength or intensity of an electrical signal or audible sound**. It is measured as a comparison to a specific level on a logarithmic scale. The larger the number, the higher the sound energy.

The power of these cables is measured in decibels (dB), which **indicates how much power the light has when it travels through the cables**. The goal, of course, is to transmit 100% of the data, so measuring how much data can be lost during transmission can tell you how well the cables are performing.

Near silence is expressed as 0 dB, but a noise measured at 10 dB is actually 10 times louder. If a sound is 20 dB, it’s **100 times louder than near silence**.

Decibel (dB), **Unit used to express the relationship between two physical quantities, usually acoustic or electrical power, or to measure the relative loudness of sounds**. One decibel (0.1 bel) is 10 times the logarithm of the power ratio.

Decibel (dB) – **a logarithmic unit of attenuation or gain used to express the relative tension or power between two signals**. For filters, we use decibels to indicate cutoff frequencies (-3dB) and blocking signal levels (-20dB), as shown in Figure F-3.

The decibel is commonly **used to indicate the ratio of change in power (increasing or decreasing)** and is commonly defined as the value that is ten times the base 10 logarithm of two levels of power.p>

dB (decibels)

**The difference (or ratio) between two signal levels**. Used to describe the effect of system devices on signal strength. For example, a cable has a signal loss of 6dB or an amplifier has a gain of 15dB. This is useful because signal strengths vary logarithmically and not linearly.

This **indicates how much power the light has as it travels through the cables**. Since the ultimate goal is to transfer 100% of the data, the most useful metric is how much of it is lost in transit. This is called dB loss.

The decibel (dB) is a logarithmic unit used **to measure sound level**. It is also widely used in electronics, signals and communications. The dB is a logarithmic way of describing a ratio. The ratio can be power, sound pressure, voltage or intensity, or several other things.

The decibel scale is logarithmic, not linear. This simply means that **for every 3 decibels you move up or down on the 0-194 scale, you add or decrease 50% of your remaining sound pressure level to your exposure**.

On the decibel scale, **the quietest audible sound (perceived near silence) is 0 dB**. A tone 10 times stronger corresponds to 10 dB. A sound 100 times stronger than near silence is 20 dB. A noise 1,000 times louder than near silence is 30 dB, 40 dB, and so on.

A positive dB means the sound is a few times louder than the threshold, while a negative dB means you are **a few times quieter than this threshold**.

**A 3 dB loss means half the performance**. For example, a system with 40 watts of input power and an insertion loss of 6 dB has only 10 watts of output power. dB: Decibel, a logarithmic (equivalent to 10 times) ratio of the difference between two values.

- https://www.ad-net.com.tw/decibels-101-everything-need-know-decibels/
- https://www.researchgate.net/post/Please-tell-me-Why-the-cutoff-frequency-is-taken-for-3dB-and-not-other-values-like-1-or-2-db
- https://www.quora.com/Why-signal-strength-is-measured-in-decibels
- https://www.cablefree.net/wirelesstechnology/decibel-power-measurement-db/
- https://www.safeopedia.com/definition/40/decibel-db
- https://www.fiberplusinc.com/helpful-information/db-loss-prevention/
- https://www.healthyhearing.com/report/52514-What-is-a-decibel
- https://www.britannica.com/science/decibel
- https://dspguru.com/dsp/reference/filter-terminology/
- https://www.electronics-tutorials.ws/filter/decibels.html
- https://www.fcc.gov/file/14382/download
- https://www.cablexpress.com/education/blog/why-minimizing-db-loss-in-fiber-cables-is-important/
- https://www.animations.physics.unsw.edu.au/jw/dB.htm
- https://www.controlnoise.com/support-tools/about-sound-waves/understanding-the-decibel/
- https://en.wikipedia.org/wiki/Decibel
- https://pulsarinstruments.com/news/understanding-decibels-decibel-scale-and-noise-measurement-units/
- https://www.scienceabc.com/pure-sciences/why-negative-decibels-are-a-thing.html
- https://dl.cdn-anritsu.com/en-us/test-measurement/ohs/10450-00061D/UserGuide/3-Adv-Cable_Antenna.04.03.html

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