Noise margin.

[ceprateek]

When I saw the status of my router then it also showed my noise margin to be 9. What is noise margin and what value it should have?

[Smash]

Noise margin describes when a signal exceeds the minimum amount for correct
operation.

It is often used to measure voltage. I dont know what it should be but I would look it up on the manufacturers site if I were you. Don't want to burn it out.

[niki]

In electrical engineering, noise margin is the amount by which a signal exceeds the minimum amount for proper operation. It is commonly used in at least two contexts:

* In communications system engineering, noise margin is the ratio by which the signal exceeds the minimum acceptable amount. It is normally measured in decibels.
* In a digital circuit, the noise margin is the amount by which the signal exceeds the threshold for a proper '0' or '1'. For example, a digital circuit might be designed to swing between 0.0 and 1.2 volts, with anything below 0.2 volts considered a '0', and anything above 1.0 volts considered a '1'. Then the noise margin for a '0' would be the amount that a signal is below 0.2 volts, and the noise margin for a '1' would be the amount by which a signal exceeds 1.0 volt. In this case noise margins are measured as an absolute voltage, not a ratio.

Noise margins are generally defined so that positive values ensure proper operation, and negative margins result in compromised operation, or perhaps outright failure.

Source--> wikipedia

[london]

Noise margin is a term used to measure the voltage of the router. it is important to know it because of the volatage fluctuations which cause problems.

[funtoosh]

My router is of cisco and it has a noise ratio of 5. This is also a possibility that different brands have different ratios so contact your vendor if there is some problem regarding speed or connectivity.