No doubt by scientists, but not by router manufacturers, as this typical one here:

In reply to a post by Loading:

SNR Margin (0.1 dB): 22 70
Attenuation (0.1 dB): 635 315
Output Power (0.1 dBm): 161 124

Tho' not as accurate as I imagined; only to the nearest CeeBees .

Edited by XRaySpeX (Wed 05-Feb-14 00:15:20)

In reply to a post by XRaySpeX:

No doubt by scientists, but not by router manufacturers, as this typical one here:

In reply to a post by Loading:

SNR Margin (0.1 dB): 22 70
Attenuation (0.1 dB): 635 315
Output Power (0.1 dBm): 161 124

Tho' not as accurate as I imagined; only to the nearest CeeBees .

That is because they either do not understand the concept of Bels and deciBels &c or they cannot be bothered to code correctly to change the reported figure into dBs ...



Would you define a length in terms of 0.1cm units or would you use mm ?

You don't have a line fault. If your aeroplane is steady in the air, but the altimeter needle is all over the place, what would you do?

Have you tried a different modem? The upstream snr is retrieved by the modem from the ATU-C using the extended operations channel. I've seen modems before suffer various glitches in this operation - one popular model flashes zero at regular intervals for example.

In reply to a post by MHC:

More often called centiBels !

In reply to a post by MHC:

That is because they either do not understand the concept of Bels and deciBels

They are bels, decibels and centibels, actually.

Bit swaping can and does change the SNR margin displayed, but how much will depend on the bins played with and the algorithm for how the SNR margin is displayed

You don't have a line fault. If your aeroplane is steady in the air, but the altimeter needle is all over the place, what would you do?

Sound advice.

But then given how many people end up following a GPS blindly many seem to believe the computer rather than employ some common sense, or heaven forbid look at a road sign

Yep, I'd agree with that too, you don't learn nowt following a sat-nav.