What is good SNR and attenuation?

In short, the lower this number is, the better: 20dB and below is outstanding. 20dB – 30dB is excellent. 30dB – 40dB is very good.

What should line attenuation and noise margin be?

The ‘Noise margin’ value should be 6 dB and higher. 11 dB to 20 dB is a good line, no problems with synchronization; 21 dB to 28 dB is a very good line; 29 dB and above is a perfect line.

What is line attenuation?

Line attenuation (loss) is a measure of how much the signal has degraded between the DSLAM and the modem. The lower the dB, the better for this measurement. Attenuation is logarithmic and each 3dB of attenuation halves the strength of the signal power received.

What’s SNR margin?

SNR margin (a.k.a. noise margin) is the difference between the actual SNR and minimal SNR required to sync at a specific speed. It can be simplified to: the difference between actual signal and signal required to sync. It is normally measured in decibels.

How can I lower my SNR margin?

SNR margin above 6dBs is good

1. Replace your router with a better one.
2. Install a good quality ADSL / VDSL filter to your router.
3. Try to change Internet provider, as some providers are less crowded than others.
4. Check cabling patching.
5. Change the in-building cabling.

How can I lower my SNR?

Fixing SNR Issues

1. Remove Extra WiFi networks. This is especially true if this is a business environment.
2. Check for “Noisy” devices. Take a look at the devices around the WiFi router.
3. Turn off unneeded signals. Some routers support multiple bands in the 2.4 GHz and 5 GHz range.

Is lower SNR better?

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.

What is SNR margin and how is it calculated?

SNR Margin is a value to set in order to get the speed you desire. It’s the difference between the actual SNR (dB noise) and the line attenuation required to sync at a specific speed. This also depends on the ADSL technology, ADSL (up to 8 Megabits), ADSL2 (up to 12 Megabits) or ADSL2+ (up to 24 Megabits).

What should the SNR and attenuation figure be for a router?

The SNR margin figure should be above 6dB and the attenuation figure must meet some standards. Note, that the router will probably display statistics for the upstream and the downstream traffic. These statisctics will be different, as upstream/downstream speed is different.

What SNR margin should I set for my ADSL speed?

This also depends on the ADSL technology, ADSL (up to 8 Megabits), ADSL2 (up to 12 Megabits) or ADSL2+ (up to 24 Megabits). Calculation example: In conclusion, in order to get speeds close to 8 Megabits for your normal ADSL, the SNR Margin should be set to 9 dB, when the noise measurements are the above values.

What is the SNR margin of a 6MB cable?

Suppose that the SNR of the cable is 34dB and the SNR to sync at 6Mb is 30dB, then the SNR margin is 34-30 = 4dB Attenuation Every cable on earth suffers of attenuation.