Team,

At the TR.30.1 meeting in Arlington, VA we discussed the conversion of 5-bit Baudot to T.140/ISO 10646. Basically, we came to the same conclusion as Gunnar describes below. However, the simple padding of 0's does not work for characters such as a carriage return, does it? Of course, there are several characters in the T.140 ISO 10646-1 Basic/Extended Latin subset and other useful T.140 characters such as a missing character that do not have Baudot equivalents, and the consensus is to use an apostrophe for missing/untranslatable characters in Baudot, right? So there would be more than specifying a simple scheme that leverages the V.18 Annex A will not suffice, right?

I am not sure if I am right here -- Fred Lucas was probably going to put together a Baudot <-> T.140 Unicode conversion table. Fred?

Rajesh


At 11:15 AM 5/23/2003 -0400, Paul E. Jones wrote:
Gunnar,
 
I was looking for a defined specification.  I think we need one to ensure consistency.
 
Paul
 
----- Original Message -----
From: Gunnar Hellström
To: Paul E. Jones
Cc: Fred Lucas ; Andrea Saks ; Keith Chu ; Herb Wildfeuer ; Rajesh Kumar
Sent: Friday, May 23, 2003 11:10 AM
Subject: SV: T.140 -> 5-bit Baudot

Paul,
 
I am not aware of any specific information about the 5-bit to Unicode conversion.
 
But it is straightforward, if you take the conversion tables from V.18 Annex A, that goes between 5-bit and 7-bit T.50, and add your knowledge that for all these 7-bit characters, the corresponding Unicode character has the same value, just padded with 0 until it is 16 bits.
 
Then you convert between  Unicode UCS-16 and Unicode UTF-8 that is used in T.140. I guess you have library functions for that.
 
If you use V.18, the 5-bit to 7-bit is already there for you.
 
The GSM implementation in the GTT feature must contain Unicode to 5-bit conversion, but I do not think it is explicitly specified anywhere how it is done.
 
What do you want to find, code or specification?
 
Gunnar

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Gunnar Hellström, Omnitor, Renathvägen 2
SE 121 37 Johanneshov, SWEDEN
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-----Ursprungligt meddelande-----
Från: Paul E. Jones [mailto:paulej@packetizer.com]
Skickat: den 23 maj 2003 12:03
Till: Gunnar Hellström
Kopia: Fred Lucas; Andrea Saks; Keith Chu; Herb Wildfeuer; Rajesh Kumar
Ämne: T.140 -> 5-bit Baudot
Gunnar,
 
It was said in the meeting that there is a way already defined to convert between Unicode and 5-bit Baudot characters.  I've not seen this conversion.  Can you point me to it?
 
Paul