Command line access to noise data

Discussion in 'Tomato Firmware' started by sstidman, Aug 27, 2009.

  1. sstidman

    sstidman Addicted to LI Member

    I want to track the signal to noise ratio of my WAN connection between two Tomato routers. I have found that I can retrieve the RX signal strenght with the following command:

    wl rssi 00:1D:7E:18:B0:80
    rssi is -87

    However, I can't always get the noise measurement. There is a "noise" option to the wl command, but it doesn't always display the noise level:

    # wl noise
    noise is 0 (off)

    If I use the "Measure" option on the "Device List" admin web page, the same command suddenly seems to work:

    # wl noise
    noise is -95

    So I guess the router calculates the noise level and stores it for a while. Is there a way to run this noise measure from the command line to ensure thath the "wl noise" command returns a meaningful value? Where is Tomato getting the noise floor info when I have not run the "Measure" command?
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