What should line attenuation and noise margin be?
Typical values are: 10dB and lower is bad. 11db – 20dB is OK. 20dB – 28dB is excellent.
What noise margin is acceptable?
Moreover, a value of less than 6 dB will facilitate frequent interruptions in your communications. However, if the noise resistance is greater than 10 dB, the line is within acceptable parameters for data transmission. For ADSL, the higher the value, the better the line quality.
What is a good SNR margin on ADSL?
In most cases, a broadband connection can work well with an SNR margin of 3 dB. When a broadband connection is first made live, a default target SNR margin is set. For a BT-based ADSL or ADSL2+ broadband service, this is 6 dB.
Should noise margin be high or low?
There are two noise margins we must consider, and they are as follows: noise margin high (NMH) and noise margin low (NML). The minimum voltage output of the driving device for a logic high (VOH min) must be larger than the minimum voltage input (VIH min) of the receiving device for a logical high.
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.
How can I boost my SNR signal?
Once you see the list of WiFi signals, you can do a few things to increase the SNR ratio:
- Remove Extra WiFi networks. This is especially true if this is a business environment.
- Check for “Noisy” devices. Take a look at the devices around the WiFi router.
- Turn off unneeded signals.
What is low level noise margin?
The noise margin, NMH = |VOH min – VIH min|, for logical high is the range of tolerance for which a logical high signal can still be received correctly. The same can be said with noise margin, NML = |VIL max – VOL max|, for logical low, which specifies the range of tolerance for logical low signals on the wire.
What affects ADSL speed?
The biggest factor that affects ADSL speed is your distance from your local telephone exchange. ADSL and ADSL2+ are delivered to your home over copper wires, and because of this, the speed of your connection to the network is impacted by the distance the information needs to travel between the exchange and your home.
What are DSL line stats and how do I use them?
DSL line stats from your modem or router can be a useful tool to aid troubleshooting adsl problems and line faults. Some users may just wish to know what the figures mean, or if they can use this information to give a rough guide as to whether or not your line can cope with higher speeds.
What do the Lineline stats mean?
Line stats are a set of various figures that can give some indication about the status and condition of your adsl connection. When using your linestats as a diagnostic tool you have to look at all the figures and not just rely on say just the sync speed or SNR Margin.
What is the Max sync rate with ADSL2+?
With adsl2+ most lines will be running to their maximum capability, and a figure of around 18-19 dBm is the norm. The sync rate you could attain if any line card or DSLAM restrictions were removed. If you see a figure like Max (Kbps): 10048 1048 then this is likely the restriction of the DSLAM on ADSL1.
How do I get my line stats from ISP?
Your ISP will also be able to get your line stats by performing something called a WOOSH test which will advise them your loop loss (attenuation) and SNR Margin. However, due to the time element involved, most ISPs are very reluctant to perform this test unless it is specifically in relation to an adsl fault.