Tutorials

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

Attenuation on an ADSL line

Attenuation is known as the decrease in signal strength due to the distance from the telephone line. The more distance there is 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 many jumpers, which is considered a bad installation.

In general, each 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 it will be delivered incomplete.

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

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

How to view and improve the attenuation

Attenuation is expressed in logarithmic units such as decibel (dB), as it is an easier 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 attenuation problems on the network is by testing the termination point. It can also be checked from the router configuration, usually it has a tool included to know the level of attenuation that exists.

How to view and improve the attenuation

Dimming faults generally cannot be controlled if the fault is outside our home. In any case, the state of the network cables found inside the house can be verified. If they have suffered deterioration or any physical damage, it is best to replace it.

ADSL installations must be done with a microfilter that separates the voice and data signals. Added to this, 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 with signal interference from electrical appliances. The level of signal interference will depend on the degree of disturbance that the device causes.

Noise on an ADSL line

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

How to check and improve noise

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

Within the settings page you should look for the SNR Margin option or something similar, it may vary depending on the router. Here the noise level that exists in the connection will be displayed, which is usually a value.

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

To improve the connection, the installation time of the cables and devices must be evaluated. As is the condition of the cables, since if they present humidity they can generate excessive noise.

Making facilities with good quality cables and avoid bridges is extremely important. Check the status of the microfilter and the connection devices such as the router or the modem.

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