[WIMS] Errata for PWG 5107.3: Printer MIB and IPP MFD Alerts

[WIMS] Errata for PWG 5107.3: Printer MIB and IPP MFD Alerts

[WIMS] Errata for PWG 5107.3: Printer MIB and IPP MFD Alerts

Michael Sweet msweet at apple.com
Tue Mar 18 16:58:36 UTC 2014


Ira,

Unfortunately, I know of existing implementations for these keywords, so I don't think changing them to use "-fault" at the end is feasible.  And at least for all of the media feed keywords the "-error" suffix is likely OK - feed errors generally require user interaction, so typically the printer will be in the stopped state, meeting the requirements of RFC 2911.

An alternative is to add definitions of 'fax-modem-protocol-warning' and 'fax-modem-protocol-report' and make the other keywords exclusively report errors that stop the printer.  The IANA registration could just be for 'fax-modem-protocol' to match the other "printer-state-reasons" registrations.


On Mar 17, 2014, at 4:45 PM, Ira McDonald <blueroofmusic at gmail.com> wrote:

> Hi Mike,
> 
> I suggest that we replace "-error" with "-fault" in all of these printer state 
> reasons.
> 
> If the current "-error" suffix is simply removed, the meaning of these alerts
> is lost.
> 
> BTW - normally, we couldn't change these names in the PrtAlertCodeTC 
> textual convention in the IANA Printer MIB, because it's illegal under SMIv2 
> rules to change the name of an already assigned enumeration value.
> 
> HOWEVER - *none* of the PWG 5107.3 section 9.2 updates for PrtAlertCodeTC
> were ever registered with IANA - this fell through the cracks in mid-2012.
> 
> SUGGESTION - we revise/update PWG 5107.3 and change the IPP and
> IANA Printer MIB names from "-error" to "-fault" (or "Error" to "Fault" in the
> MIB) and correct or submit the IANA IPP and MIB registrations.
> 
> WDYT?
> 
> Cheers,
> - Ira
> 
> 
> 
> Ira McDonald (Musician / Software Architect)
> Co-Chair - TCG Trusted Mobility Solutions WG
> Chair - Linux Foundation Open Printing WG
> Secretary - IEEE-ISTO Printer Working Group
> Co-Chair - IEEE-ISTO PWG Internet Printing Protocol WG
> IETF Designated Expert - IPP & Printer MIB
> Blue Roof Music / High North Inc
> http://sites.google.com/site/blueroofmusic
> http://sites.google.com/site/highnorthinc
> mailto: blueroofmusic at gmail.com
> Winter  579 Park Place  Saline, MI  48176  734-944-0094
> Summer  PO Box 221  Grand Marais, MI 49839  906-494-2434
> 
> 
> 
> On Mon, Mar 17, 2014 at 2:07 PM, Michael Sweet <msweet at apple.com> wrote:
> All,
> 
> It was recently pointed out to me that PWG 5107.3 defines several "printer-state-reasons" keywords with the suffix "-error":
> 
>     input-media-tray-feed-error
>     output-media-tray-feed-error
>     media-path-input-feed-error
>     media-path-output-feed-error
>     scan-media-path-input-feed-error
>     scan-media-path-output-feed-error
>     fax-modem-protocol-error
> 
> However, RFC 2911 reserves this suffix for indicating the severity of the reason:
> 
>    4.4.12 printer-state-reasons (1setOf type2 keyword)
> 
>    This REQUIRED Printer attribute supplies additional detail about the
>    device's state.  Some of the these value definitions indicate
>    conformance requirements; the rest are OPTIONAL.
> 
>    Each keyword value MAY have a suffix to indicate its level of
>    severity.  The three levels are: report (least severe), warning, and
>    error (most severe).
> 
>       - '-report':  This suffix indicates that the reason is a "report".
>         An implementation may choose to omit some or all reports. Some
>         reports specify finer granularity about the printer state;
>         others serve as a precursor to a warning. A report MUST contain
>         nothing that could affect the printed output.
>       - '-warning': This suffix indicates that the reason is a
>         "warning".  An implementation may choose to omit some or all
>         warnings. Warnings serve as a precursor to an error. A warning
>         MUST contain nothing that prevents a job from completing, though
>         in some cases the output may be of lower quality.
>       - '-error': This suffix indicates that the reason is an "error".
>         An implementation MUST include all errors. If this attribute
>         contains one or more errors, printer MUST be in the stopped
>         state.
> 
>    If the implementation does not add any one of the three suffixes, all
>    parties MUST assume that the reason is an "error".
> 
> Since an IPP Printer MAY report any of the above keywords when the Printer is not in the stopped state, I propose we add an informative note to table 3 saying something like the following:
> 
>     Note 1: Section 4.4.12 [RFC2911] requires that the Printer is in the
>     stopped state when reporting "printer-state-reasons" values ending
>     with "-error". Printers MUST append a suffix of "-report" or
>     "warning" to this keyword when the Printer is not in the stopped
>     state.
> 
> I'm not sure if we want to clarify that the "job-state-reasons" attribute only contains the registered values without added suffixes.
> 
> _________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
> 
> 
> _______________________________________________
> wims mailing list
> wims at pwg.org
> https://www.pwg.org/mailman/listinfo/wims
> 
> 

_________________________________________________________
Michael Sweet, Senior Printing System Engineer, PWG Chair

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