P1394 Mail Archive: P1394> units and logical units definition

P1394 Mail Archive: P1394> units and logical units definition

P1394> units and logical units definition

Atsushi_Nakamura (atsnaka@bsd.canon.co.jp)
Mon, 16 Mar 1998 20:58:11 +0900

I have a questions about the current profile.

I am still wondering if the usage method of SBP-2
logical units(and "unit"s) in the printer profile
matches with the meaning of logical units
described in SBP-2.

In the SBP-2 spec, it says ;

"A logical unit is part of the unit architecture and is
an instance of a device model e.g., mass storage,
CD-ROM or printer"

In section 17:Model Configuration of document 0.1d -PWG
printer profile, it says ;

"Each unique combination of the above information represents
a unique service provided by the device and is identified as a
separate Unit within the device. Zero or more instances of
a unit may exist within the device at any given time.
All instances of a unit have identical functionality."

It may be my lack of mis-understanding, but doesn't the
2 statements conflict ?
SBP-2 considers logical units as instances of "device" models
whereas the printer profile considers logical units as instances
of a "logical channels".

If there is 1 instance of a printer device with multiple
SBP-2 logical channels, how do I address this device as a
unit architecture following both rules ?

1 "printer" unit with 2 logical unit directories?...
but then,a logical unit has to be "an instance" of a
device model,so there should be only 1 logical unit ????

Ats

-----------------------------------------
Atsushi Nakamura
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BJ Technology Develpoment 22,
Canon Inc.

53 Imai Kami-cho
Nakahara-Ku, Kawasaki-shi
postal no. 211

tel:+81-3-44-733-6111(ext.5593)
+81-3-44-739-6634(direct)
fax:+81-3-44-739-6756
email(1):Atsushi_Nakamura@cbj.canon.co.jp
email(2):atsnaka@bsd.canon.co.jp
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