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Hi, Wednesday (3 November 2010)<br><br>High North has reviewed the PWG Imaging System Power Management specs<br>and has the following comments:<br><br><br>Power Model (wd-wimspower10-20100926.pdf)<br>
<br>(1) Editorial - replace "transitional" with "interrupt" (for states)<br> - section 2.4.2, line 408 (first instance - global change)<br><br> Rationale: Original term is obscure and inaccurate<br>
- all power states may be "transitional" during ResetXxx operations<br> - all non-Stable states are defined as software/hardware interrupts<br> in sections 2.4.2 and 2.4.3<br><br>(2) Technical - delete all 10 PowerGeneral.MaxXxxRecords elements<br>
- section 5.1.1 through 5.1.10, lines 825-892<br><br> Rationale: Table limit elements are unlikely to be queried/used<br> - typical Client will simply attempt to create a row<br><br>(3) Technical - reduce PowerMeter from RECOMMENDED to OPTIONAL<br>
- section 5.5, lines 1043-1050<br><br> Rationale: All elements exposing power usage should be OPTIONAL<br> - legal issues have already been caused by vendor power usage claims<br><br>(4) Technical - reduce PowerSupport from RECOMMENDED to OPTIONAL<br>
- section 6.1, lines 1189-1193<br><br> Rationale: All elements exposing power usage should be OPTIONAL<br> - legal issues have already been caused by vendor power usage claims<br><br> Rationale: PowerSupport group was originally designed to be simple<br>
list of supported power states<br> - addition of power/job/network usage elements forced only Stable<br> states to be listed (breaking original design)<br> - PowerGeneral.CanRequestPowerStates was added to correct the design<br>
flaw, so original purpose of PowerSupport group is now redundant<br><br>(5) Technical - reduce PowerTransition from RECOMMENDED to OPTIONAL<br> - section 6.2, lines 1270-1275<br><br> Rationale: All elements exposing power usage should be OPTIONAL<br>
- legal issues have already been caused by vendor power usage claims<br> and transition times are implicit vendor power usage claims<br> - PowerTransition shouldn't be higher conformance than PowerSupport<br>
<br><br>Power MIB (wd-wimspowermib10-20100926.pdf/mib)<br><br>(1) Editorial - replace "transitional" with "interrupt" (for states)<br> - section 2.4, line 228 (first instance - global change)<br><br>
Rationale: See Power Model comment (1) above<br><br>(2) Technical - delete all 10 powGeneral.MaxXxxRecords objects<br> - section 5 (spec), lines 261-363 and 389-413 (MIB)<br><br> Rationale: See Power Model comment (2) above<br>
<br>(3) Technical - reduce powMeterGroup from RECOMMENDED to OPTIONAL<br> - section 5 (spec), lines 1740-1744 (MIB)<br><br> Rationale: See Power Model comment (3) above<br><br>(4) Technical - reduce powSupportGroup from RECOMMENDED to OPTIONAL<br>
- section 5 (spec), lines 1692-1697 (MIB)<br><br> Rationale: See Power Model comment (4) above<br><br>(5) Technical - reduce powTransitionGroup from RECOMMENDED to OPTIONAL<br> - section 5 (spec), lines 1699-1704 (MIB)<br>
<br> Rationale: See Power Model comment (5) above<br><br><br>Cheers,<br>- Ira (Editor of Power Model and Power MIB)<br><br clear="all">Ira McDonald (Musician / Software Architect)<br>Chair - Linux Foundation Open Printing WG<br>
Co-Chair - IEEE-ISTO PWG IPP WG<br>Co-Chair - TCG Hardcopy WG<br>IETF Designated Expert - IPP & Printer MIB<br>Blue Roof Music/High North Inc<br><a href="http://sites.google.com/site/blueroofmusic" target="_blank">http://sites.google.com/site/blueroofmusic</a><br>
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