From: Richard_Landau@Dell.com
Date: Fri Oct 20 2006 - 15:32:33 EDT
My off-center read on the cover table = shabby naming. What is included
here is the set of "covers and interlocks." Quoth the MIB, "The cover
portion of the General print sub-unit describes the covers and
interlocks of the printer. The Cover Table has an entry for each cover
and interlock." However, the only covers that count are the ones with
interlocks on them. No interlock sensor, no table entry. A door is a
door only if it has an interlock sensor on it. All covers are
interlocks, but not all interlocks are covers. The group should have
been called interlocks in the first place. Flame off. :-)
Thinking how one might implement an IsCover boolean property in a
CIM-to-SNMP proxy agent, one would have to use the enum values
{door,interlock} x {Open,Closed}, which the client can use anyway if we
preserve the enums.
Not a big deal. Maybe we'll flip a coin in Lexington. The projector
group was not bound to the naming of the past, so Interlock group was an
okay name. The description (attached, which I wrote for it, I admit),
applies well to printers, I think, except perhaps for the word
"projector."
rick
PS: If I can ever get to the ftp site, I will upload the amended
spreadsheet, which says PrintDeviceCover.
________________________________
From: McDonald, Ira [mailto:imcdonald@sharplabs.com]
Sent: Friday, October 20, 2006 12:46
To: Landau, Richard
Cc: wims@pwg.org
Subject: RE: What name for Covers?
Hi Rick,
The Printer MIB did a bit of shabby modelling, because an Interlock
may protect a part (e.g., pinch roller) that is NOT a Cover (I've seen
MIB-walks of real printers that did this).
Locations in MediaPaths are often instrumented with Interlock sensors,
although the thing being moved/removed isn't always a cover.
So, what about 'prtCoverTable' maps to 'PrintInterlock(s)', but
with a good Description cause explaining the legacy Printer MIB
modelling, and ADDING an 'IsCover' boolean property (defaults
to 'false' of course) to disambiguate the two cases?
Cheers,
- Ira
Ira McDonald (Musician / Software Architect)
Blue Roof Music / High North Inc
PO Box 221 Grand Marais, MI 49839
phone: +1-906-494-2434
email: imcdonald@sharplabs.com
-----Original Message-----
From: Richard_Landau@Dell.com [mailto:Richard_Landau@Dell.com]
Sent: Friday, October 20, 2006 1:20 PM
To: McDonald, Ira
Cc: wims@pwg.org
Subject: RE: What name for Covers?
Gee, I thought that Cover included Interlock and that they were already
thoroughly intertwined a decade ago by the TC that you cited. It's only
the sensor that we care about, whether it's on a door or an internal
component -- for instance, if there is a door without a sensor, it
certainly would not appear in this group -- so I thought that interlock
was the more general and inclusive term.
---------
PrtCoverStatusTC ::= TEXTUAL-CONVENTION
-- This TC was extracted from prtCoverStatus in RFC 1759.
STATUS current
DESCRIPTION
"Values for encoding the state of a particular cover or
access panel on the printer case or enclosure."
SYNTAX INTEGER {
other(1),
coverOpen(3),
coverClosed(4),
interlockOpen(5),
interlockClosed(6)
}
---------
But if the group wants PrintDeviceCovers, hey, I'm easy. Other opinions
or suggestions?
rick
________________________________
From: McDonald, Ira [mailto:imcdonald@sharplabs.com]
Sent: Friday, October 20, 2006 11:56
To: Landau, Richard
Cc: 'wims@pwg.org'
Subject: RE: What name for Covers?
Hi Rick,
[copied WIMS list to make others aware of these issues]
A Cover is NOT an Interlock (in the Printer MIB) - the Interlock is just
the
sensor and logic.
Conflating Cover with Interlock will screw up the semantics of some
widely
implemented existing values of 'PrtAlertCodeTC' as well.
In the WIMS and Semantic Model/v2.0 schema Subunits.xsd, the classes
are simply Cover(s).
I dislike abandoning Printer MIB terms - how about
'PrintDeviceCover(s)'?
Cheers,
- Ira
Ira McDonald (Musician / Software Architect)
Blue Roof Music / High North Inc
PO Box 221 Grand Marais, MI 49839
phone: +1-906-494-2434
email: imcdonald@sharplabs.com
-----Original Message-----
From: Richard_Landau@Dell.com [mailto:Richard_Landau@Dell.com]
Sent: Friday, October 20, 2006 12:39 PM
To: McDonald, Ira
Subject: What name for Covers?
I think that PrintCovers is a crummy name for a class. Almost everyone
who did not grow up with PrinterMIB would misunderstand the class until
they read the description. I suggest PrintInterlocks. In the Projector
& Display Management group, we are calling the comparable stuff the
Interlock Group. (If there isn't a sensor on the door, then we don't
care about it.) Seem reasonable to use PrintInterlock as a classname
instead?
rick
----------------------
Richard_Landau(at)dell(dot)com, Stds & System Mgt Arch, CTO Office
+1-512-728-9023, One Dell Way, RR5-3, MS RR5-09, Round Rock, TX 78682
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