Well, I don't have my "green card" with me at the moment, but IIRC 3F is the 
EBCDIC SUB character, which means mapping it to ASCII 1A is correct.  EBCDIC 41 
I think is "hard space" or something like that, and classic 7-bit ASCII does 
not support such a character, so there is no way for EBCDIC 41 to "round trip" 
through classic 7-bit ASCII (which is what I believe CCSID 1208 is, no?).  Now 
if you are transferring through ISO8879 (Latin-1) or UTF-8 instead, there may 
be a code point in one of those CCSID's that maps to "hard space".  I don't 
have time for the necessary code point research at the moment, but you may want 
to look into those CCSID's as an alternative to CCSID 1208.

HTH

Peter

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf Of 
Charles Mills
Sent: Tuesday, June 12, 2012 1:10 PM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Anyone a Unicode Services expert? -- roundtrip conversion

Thanks, Peter. 

Please understand I am not criticizing or faulting z/OS Unicode Services. I
am just trying to explain to a customer the output they may expect to see
when they use our product that in turn uses Unicode Services (USS? -- LOL --
never mind).

Let's leave PCs out of it. If I were going z/OS to z/OS to z/OS, how could
both 3F and 41 make the round trip successfully?

Charles

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf
Of Farley, Peter x23353
Sent: Tuesday, June 12, 2012 9:04 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Anyone a Unicode Services expert? -- roundtrip conversion

I believe that slide refers to "round trips" within the z/OS world only.
There is no statement that CCSID conversion by a system other than z/OS
(such as the PC ftp client in your example) will be covered in the 'round
trip" guarantee.

You have to be transmitting and receiving with the same or a very compatible
iconv() instance to be able to make such a guarantee.  It's remotely
possible that transmission to a linux ftp client with an iconv() that is
compatible with the z/OS iconv() *might* support such a guarantee (e.g.,
z/Linux), but I wouldn't bet on it.  And Win systems are almost guaranteed
NOT to support such a guarantee.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On Behalf
Of Charles Mills
Sent: Tuesday, June 12, 2012 11:49 AM
To: IBM-MAIN@bama.ua.edu
Subject: Re: Anyone a Unicode Services expert? -- roundtrip conversion

Well, Peter, that's certainly consistent with what I see.

I'm looking, however, at slide 11 of
http://publib.boulder.ibm.com/infocenter/ieduasst/stgv1r0/index.jsp?topic=/c
om.ibm.iea.zos/zos/1.9/IntegratingNewAppOnzOS/zOSV1R9_Integrating_newAppl_LE
UnicodeServices/player.html . (You may have to unfold that URL.)

It says "R - Roundtrip conversion. Roundtrip conversions between two CCSIDs
assure that all characters making the roundtrip arrive as they were
originally." How is that going to be accomplished if both 3F and 41
translate to 1A? How will they make the round trip back to what they were?

What does technique R mean?

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