How to check and improve the noise and attenuation of an ADSL line?

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Marie-Ange Demory
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Attenuation on ADSL line

Attenuation is known as decrease in signal strength due to distance from the telephone line. The greater the distance between the control panel and the network access point (the modem), the lower the signal strength. Another factor that could cause attenuation is that the cable is joined with one or more jumpers, which is considered a bad installation.

In general, any type of network has distance restrictions to avoid attenuation. If the signal becomes too weak, the receiving equipment will not receive the information well or will be delivered incomplete.

Fiber optic connections have an attenuation level of 1 dB for each kilometer traveled. While the copper UTP cable connections used in the ADSL connections have a loss of 10dB per kilometer.

avoid attenuation, repeaters or amplifiers are often used to increase the signal strength, as the cable is usually limited to a specific distance.

How to view and improve attenuation

Attenuation is expressed in logarithmic units such as decibels (dB), as it is a simpler measure for calculations. Its value is exponential and the lower its value, the lower the attenuation level that the connection presents.

One way to identify if there are mitigation problems on the network is test the termination point. It can also be verified by the router configuration, usually it has a tool included to know the existing attenuation level.

Blind faults generally cannot be checked if the fault is away from home. In any case it is possible check the status of the network cables present inside the house. If they have suffered deterioration or physical damage, it is best to replace it.

ADSL installations must be done with a microfilter that separates voice and data signals. Also, ADSL connections should not be made over a PCR line because it interferes with the transmission of information.

Noise on an ADSL line

The term noise in the telecommunications area is associated interference with the signal from electrical appliances. The level of signal interference will depend on the degree of noise caused by the device.

Unlike attenuation , the noise does not interfere with correct data transmission as long as the signal strength is greater than the noise.

How to control and improve noise

The noise level is measured in SNR or decibels, even if the SNR term is the most used in ADSL devices. To identify the noise level in the connection, you need to access the router configuration with your username and password.

Within the settings page you should look for the option SNR margin or something similar, it may vary by router. The noise level existing in the connection will be displayed here, which is usually a value.

If the value is less than 6 dB, the noise is considerable. If the value obtained is between 7 dB and 10 dB, there is a lot of noise in the connection. Optimal values ​​are between 11 dB and 20 dB.

To improve the connection it is necessary to evaluate the installation times of the cables and devices. As well as the state of the cables, since if have humidity can generate excessive noise.

To achieve structures with good quality cables and avoiding bridges is extremely important. Check the status of the microfilter and connecting devices such as the router or modem.

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