Microsens Media Converter/Signal Repeater Module User Manual page 18

Media Converter/Signal Repeater
temperature, optical input power, etc. provided by the DDM. The DDM or Digital
Diagnostic Monitoring in each SFP provides real-time monitoring of voltage and
temperature readings of each optical component, together with thresholds and alarms.
A description of all the available measurements can be found in Appendixes.
The following describes the method of interpretation of the different types of
measurements:
Temperature
The object:
•
ms430580mMesrportaTemperature
Location:..\microsens\modulems430580m\ms430580mmeasures\
ms430580mMesrClient\
The object:
•
ms430580mMesrportbTemperature
Location:..\microsens\modulems430580m\ms430580mmeasures\
ms430580mMesrLine\
Give the temperature value of the SFP plugged into Line 1 and Line 2, read from the
Digital Diagnostic Monitoring (Unit = °C) . The following formula must be applied to
the returned value in order to obtain the actual temperature:
T (°C) = MSB + LSB/256
Parameter
MSB
LSB
For example:
A listing of ms430580mMesrportaTemperature outputs the following:
***** SNMP QUERY STARTED *****
1: ms430580mMesrportaTemperature (integer) 11066
***** SNMP QUERY FINISHED *****
The value returned from the SFP in Line 1 is: 11066. This is a decimal value,
the Hexadecimal equivalent is: 2B3A
2B (hex) = 43 (dec) and 3A (hex) = 58 (dec)
So applying the formula: T = 43 + 58/256
Gives an actual temperature of: + 43.23°C
Voltage
The object:
•
ms430580mMesrportaVolt
Location:..\microsens\modulems430580m\ms430580mmeasures\
ms430580mMesrClient\
The object:
•
ms430580mMesrportbVolt
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Meaning
Most Significant Byte
Least Significant Byte
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Format
Signed Byte
Unsigned Byte