-32763.0 dBm

Bjørn Mork bjorn at mork.no
Thu Sep 27 05:23:20 PDT 2012


Aleksander Morgado <aleksander at lanedo.com> writes:

>> Your output with Get Signal Strength was before:
>> 
>> ECIO:
>>         Network 'umts': '-126.0 dBm'
>> 
>> That was given from a raw read value of '252' treated as unsigned. If we
>> treat that value as signed we would get '-4', which multiplied by (-0.5)
>> gives us +2dBm.
>
> Which takes us to the next issue, which is that EcIo is not supposed to
> be positive as you usually have more interference/noise than signal
> energy...

Really? Well, anyway, the last patch seems to give consistent readings:

bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
[/dev/cdc-wdm0] Successfully got signal info
WCDMA:
        RSSI: '-85 dBm'
        ECIO: '5.5 dBm'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
[/dev/cdc-wdm0] Successfully got signal info
WCDMA:
        RSSI: '-85 dBm'
        ECIO: '3.5 dBm'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
[/dev/cdc-wdm0] Successfully got signal info
WCDMA:
        RSSI: '-85 dBm'
        ECIO: '3.5 dBm'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-info
[/dev/cdc-wdm0] Successfully got signal info
WCDMA:
        RSSI: '-85 dBm'
        ECIO: '3.5 dBm'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
[/dev/cdc-wdm0] Successfully got signal strength
Current:
        Network 'umts': '-85 dBm'
RSSI:
        Network 'umts': '-85 dBm'
ECIO:
        Network 'umts': '3.5 dBm'
IO: '-106 dBm'
SINR: (8) '9.0 dB'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
[/dev/cdc-wdm0] Successfully got signal strength
Current:
        Network 'umts': '-85 dBm'
RSSI:
        Network 'umts': '-85 dBm'
ECIO:
        Network 'umts': '3.5 dBm'
IO: '-106 dBm'
SINR: (8) '9.0 dB'
bjorn at nemi:/usr/local/src/git/libqmi$ cli/qmicli -d /dev/cdc-wdm0 --nas-get-signal-strength
[/dev/cdc-wdm0] Successfully got signal strength
Current:
        Network 'umts': '-85 dBm'
RSSI:
        Network 'umts': '-85 dBm'
ECIO:
        Network 'umts': '3.5 dBm'
IO: '-106 dBm'
SINR: (8) '9.0 dB'


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