Is High Attenuation Good Or Bad?

Is low attenuation a sign of good quality fiber?

Is low attenuation a sign of good quality fiber.

Generally yes, but in lighting fiber optics the manufacturer’s attenuation figures are frequently meaningless..

What is a good line attenuation?

The attenuation depends on the cable length between the ADSL modem and the DSL switch. The higher the value of this parameter, the lower the line quality and therefore the lower the data transfer/receipt speed. Optimal values should be between 5 and 30 dB (excellent or good line).

What attenuation means?

Attenuation is a general term that refers to any reduction in the strength of a signal. Attenuation occurs with any type of signal, whether digital or analog. Sometimes called loss, attenuation is a natural consequence of signal transmission over long distances.

What does attenuation mean in CT scan?

PET/CT > Physics > Attenuation Attenuation is the loss of detection of true coincidence events because of their absorption in the body or due to their scattering out of the detector field of view. Attenuation problems are greater with PET imaging compared to traditional nuclear medicine SPECT imaging.

How is attenuation calculated?

The amount of attenuation in a given network is determined by the ratio of: Output/Input. For example, if the input voltage to a circuit is 1 volt (1V) and the output voltage is 1 milli-volt (1mV) then the amount of attenuation is 1mV/1V which is equal to 0.001 or a reduction of 1,000th.

What is the best SNR value?

Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications.

Why is SNR margin low?

Actually the connection is wired from the exchange to your home and the cables are of copper so during raining it got moisture so it affect the signal strength. Second is the distance between Exchange to your nearest DP. More is the distance less will be SNR.

What causes cable attenuation?

Inherent attenuation can be caused by a number of signaling issues including: Transmission medium – All electrical signals transmitted down electrical conductors cause an electromagnetic field around the transmission. … Crosstalk from adjacent cabling causes attenuation in copper or other conductive metal cabling.

Is attenuation good or bad?

Line attenuation (loss) is a measure of how much the signal has degraded between the DSLAM and the modem. This is largely a function of the distance from the exchange. The lower the dB, the better for this measurement. … High value Line Attenuation very poor.

How can SNR and line attenuation be improved?

Luckily, there are some things you can do to improve the SNR margin:Buy a router that is good enough to manage low SNR margin figures.Install a good quality ADSL filter to your router and to each phone device installed on the same line.Try to change the ADSL provider, as some providers are less crowded than others.More items…

Why is attenuation important?

Attenuation is the reduction in amplitude and intensity of a signal. … Attenuation is an important property in telecommunications and ultrasound applications because of its importance in determining signal strength as a function of distance.

What are the causes of attenuation?

Attenuation is the reduction in power of the light signal as it is transmitted. Attenuation is caused by passive media components, such as cables, cable splices, and connectors.

What does low attenuation mean on CT scan?

Attenuation is a feature of CT, and low attenuation means that a particular area is less intense than the surrounding. All of the malignant nodules confirmed by biopsy have low attenuation, with the exception of two which have a mixture of high and low attenuation.

How do you reduce line attenuation?

How to Reduce Line Attenuation For DSLChange the network and connection cables running from your cable to your modem. … Switch the cables running from your modem to the main source of power in the building you are in. … Find the phone jack where your modem connects to the phone line in your building.More items…

What does attenuation mean medically?

Medical Definition of attenuation : a decrease in the pathogenicity or vitality of a microorganism or in the severity of a disease.

Is higher or lower SNR better?

Greater than 40 dB is even better! Recommended minimum SNR for data is 18 dB and for voice over wifi it is 25 dB. As more interference is introduced, the SNR decreases because it raises the noise floor. Let’s take an example of a laptop and an access point.

How do you determine Snr?

The easiest way – you can divide the amplitude (or sum of the amplitudes present in the certain part of the spectrum) referring to your ‘usable’ signal, by the same referring to part occupied by noise. For power spectrum SNR = (average signal power)/ average noise power), which in dB refers to (SNRdB=10 log10(SNR).