We already have that setting enabled. However these sensors are not linked to ports in Observium (we wish they were). We are only able to identify the port involved from the sensor name.

On Sat, Jun 29, 2024 at 2:18 AM Mike Stupalov <mike@observium.org> wrote:

Hi,

 for converting mW dom sensors to dBm, set option:
Global Settings -> Entities -> (Ports) Convert Port DOM power sensors to dBm.

Corwin Ziegler Hunts via observium wrote on 25.06.2024 21:13:

Hi Observium team,

We're having issues with some of the generated graphs. Some of our devices report the light level received by SFPs using mW (rather than dBm). We are on the latest stable revision (13582).

Issue 1: The graphs generated by Observium for these sensors usually show an excessive scale of at least -100 mW to 100 mW when the data in the specified time interval are entirely within the range 100 nW to 1 mW and usually only a small chunk of that. The calculated minimum and maximum values shown below the graph are correct. These graphs worked properly in the past with a prior version of Observium.

Issue 2: Selecting and deselecting the Force Autoscale option appears to have no effect on the generated graph or displayed rrd graph command. Manually running the generated rrd graph command after removing the "--alt-autoscale" option results in a good graph.

Here is the raw SNMP output for one of the these sensors showing a current value of 0.5560mW:

ENTITY-SENSOR-MIB::entPhySensorType.1000004631 = INTEGER: watts(6)
ENTITY-SENSOR-MIB::entPhySensorScale.1000004631 = INTEGER: milli(8)
ENTITY-SENSOR-MIB::entPhySensorPrecision.1000004631 = INTEGER: 4
ENTITY-SENSOR-MIB::entPhySensorValue.1000004631 = INTEGER: 5560
ENTITY-SENSOR-MIB::entPhySensorOperStatus.1000004631 = INTEGER: ok(1)

Corwin

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