Contents
- 1 What is upstream and downstream SNR?
- 2 What is the best SNR margin?
- 3 Why is upstream and downstream attenuation difference?
- 4 What is a good downstream power level?
- 5 Is higher SNR margin better?
- 6 What is a good downstream SNR?
- 7 What should the SNR margin be for ADSL?
- 8 What is the difference between SNR and SNR margin?
What is upstream and downstream SNR?
Downstream SNR (Signal to Noise Ratio) refers to the signal being sent in relation to the noise on the line. Upstream Power refers to the line signal from the cable modem to transmit data back to the cable provider.
What is the best SNR margin?
In short, the lower this number is, the better:
- 20dB and below is outstanding.
- 20dB – 30dB is excellent.
- 30dB – 40dB is very good.
- 40dB – 50db is OK.
- 50dB and above is bad.
How do you increase SNR margin downstream?
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.
Why is upstream and downstream attenuation difference?
Re: Upstream Line/Signal Attenuation HIGHER than Downstream! The upstream and downstream channels are separate from each other, so there’s no hard and fast law that the attenuations are linked in any way although there may be a rule of thumb.
What is a good downstream power level?
-7 to +7 dBmV
Good Downstream power levels are within -7 to +7 dBmV. Good Upstream power levels are within 38-48 dBmV. To view the upstream and downstream power levels: Launch a web browser from a computer or mobile device that is connected to your network.
What should my downstream SNR be?
What do your readings mean (Downstream)?
| Power level (dBmV) | SNR |
|---|---|
| -15 to -6 -6 to +15 | 33 dB or higher 30 dB or higher |
Is higher SNR margin better?
Noise margin (also known as Signal-to-noise ratio margin, SNR) — is used to measure line quality and defines a minimum limit at which the signal level is above the noise level. The higher the value, the better the line quality. The ‘Noise margin’ value should be 6 dB and higher.
What is a good downstream SNR?
The modem status will show the downstream SNr (signal to noise ratio) which usually should be above 30, mid to upper 30’s is good, over 30 usually means you’ve got too much power anyhow, and under the 25-30 range you’re gonna start losing packets.
What should the upstream Snr be on a cable modem?
This is true for both the “Downstream SNR” and the “Upstream SNR”, which may be different values. Typically, cable modems show the Downstream SNR, the Upsteram SNR can only be calculated at the remote end of the coax (usually at the node). Just remember that higher SNR means cleaner signal. A value well over 40 may mean you have too much power.
What should the SNR margin be for ADSL?
This also depends on the ADSL technology, ADSL (up to 8 Megabits), ADSL2 (up to 12 Megabits) or ADSL2+ (up to 24 Megabits). 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 difference between SNR and SNR margin?
The SNR margin is the difference between the SNR of the cable and the SNR needed to get an specific speed. Every cable on earth suffers of attenuation. It is a measure of how the signal loses strength when running through the cable.
What’s the difference between SNR and line attenuation?
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).