No current public standard defines power-related counters or meters - they are not addressed in PWG Imaging Systems Counters v1.1 (PWG 5106.1-2007), PWG Imaging System State and Counter MIB v2 (PWG 5106.3-2008), or current drafts of the PWG Power Management Model and PWG Imaging System Power MIB (4 December 2009).
However, several large enterprise customers have recently expressed an interest in standardized power-related counters and meters (e.g., for use by fleet management applications that track the operating costs of printers and MFDs). A lively discussion ensued at during the WIMG WG session at the PWG F2F last week, with several use cases suggested.
[Note: The abstract datatype Gauge (XML int / SNMP Gauge32) should be added to Table 1 in Section 2.3]
[Note: The following text should be added to Section 3.2]
Reading Power Counters for diagnostics...
[to be supplied]
Reading Power Meters for cost analysis and configuring new policies...
[to be supplied]
[Note: The following text should be added to Section 5]
The Power Counter group of Power Status elements contains the power counters for this Imaging System and MUST only be instantiated on the System object. The following OPTIONAL read-only elements are defined in the Power Counter group.
This read-only element specifies the lifetime number of transitions into the Hibernate power state in a positive 32-bit integer or zero (XML Schema/SNMP MIB) of this Imaging System.
This read-only element specifies the lifetime number of transitions into the On power state in a positive 32-bit integer or zero (XML Schema/SNMP MIB) of this Imaging System.
This read-only element specifies the lifetime number of transitions into the Standby power state in a positive 32-bit integer or zero (XML Schema/SNMP MIB) of this Imaging System.
This read-only element specifies the lifetime number of transitions into the Suspend power state in a positive 32-bit integer or zero (XML Schema/SNMP MIB) of this Imaging System.
The Power Meter group of Power Status elements contains the power meters for this Imaging System and MUST only be instantiated on the System object. The following OPTIONAL read-only elements are defined in the Power Meter group.
The read-only element specifies whether or not Power Meter properties for this Imaging System are based on actual measurement (true) or software estimation (false) in a binary encoding ('boolean' in an XML Schema or 'TruthValue' in an SNMP MIB).
Default Value: "false"
The read-only element specifies whether or not Power Meter properties for this Imaging System use units of Root Mean Square (RMS) watts (true) or peak watts (false) in a binary encoding ('boolean' in an XML Schema or 'TruthValue' in an SNMP MIB).
Default Value: "false"
This read-only element specifies the current power consumption in watts in a positive 32-bit integer or zero (for less than one watt, i.e., nominal none) of this Imaging System.
This read-only element specifies the peak power consumption in watts in a positive 32-bit integer or zero (for less than one watt, i.e., nominal none) since last reboot of this Imaging System.
This read-only element specifies the current month's power consumption in kilowatt hours in a positive 32-bit integer or zero (for less than one kilowatt hour, i.e., nominal none) of this Imaging System.
Usage: Because it specifies the *current* month's power consumption, the value of this property will change rapidly.
This read-only element specifies the previous month's power consumption in kilowatt hours in a positive 32-bit integer or zero (for less than one kilowatt hour, i.e., nominal none) of this Imaging System.
Usage: Because it specifies the *previous* month's power consumption, the value of this property will be stable and may be read on any day of the current month (for reliable accounting).
This read-only element specifies the lifetime power consumption in kilowatt hours in a positive 32-bit integer or zero (for less than one kilowatt hour, i.e., nominal none) of this Imaging System.