What should line attenuation be?
Below 10dB is very bad and more than 20dB is good. At higher ratios, more speed can be achieved and lower ratios mean error-prone cable and lower speeds. 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.
What is noise margin for broadband?
The minimum noise margin limit for data transmission is 6 dB, and a value lower than this will not support a stable ADSL connection. Moreover, a value of less than 6 dB will facilitate frequent interruptions in your communications.
How do you reduce line attenuation?
How to Reduce Line Attenuation For DSL
- Change the network and connection cables running from your cable to your modem.
- Switch the cables running from your modem to the main source of power in the building you are in.
- Find the phone jack where your modem connects to the phone line in your building.
Is attenuation good or bad?
The greater the attenuation in a circuit, then more signal will be lost. So lower attenuation cable is always better but it comes at a price. Designers must make tradeoffs between cost, availability and “good enough” designs that make sense for everyone. However, not all attenuation is bad.
What does line attenuation mean?
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 is SNR margin and line attenuation 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). Calculation example: Desired downstream in Kilobits per second: 8096 (ADSL) SNR: 44 dB Attenuation: 35 dB SNR Margin: 44-35 = 9 dB
Which is better line attenuation or noise margin?
Attenuation is how much the signal has been reduced. So lower attenuation is better. So that’s not the problem. On the other hand, noise margin being higher is better. If they can look at their noise margin figures, that may give you a clue.
What is considered good DSL noise margin / Snr?
11dB-20dB is good with little or no sync problems (if no large variation) 20dB-28dB is excellent. 29dB or above is outstanding. The more commonly used SNR margin, as described below is sometimes abbreviated as simply SNR as well. SNR margin (a.k.a. noise margin) is the difference between the actual SNR and minimal SNR required to sync
Why is my ADSL line attenuation so low?
This could be because of the electromagnetic noise (cars,music,dogs barking) or the ADSL exchange’s load (people talking). Signal-to-noise ratio (SNR) is another figure you can check in the ADSL stats of your home / corporate router ( show dsl interface atm (something) for Cisco).