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: mailto:gunnar.hellstrom@omnitor.seGunnar Hellström To: mailto:paulej@packetizer.comPaul E. Jones Cc: mailto:fred.lucas@worldnet.att.netFred Lucas ; mailto:asaks@waitrose.comAndrea Saks ; mailto:chuk@dvttest.nb.rockwell.comKeith Chu ; mailto:hwildfeu@cisco.comHerb Wildfeuer ; mailto:rkumar@cisco.comRajesh 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

---

Gunnar Hellström, Omnitor, Renathvägen 2 SE 121 37 Johanneshov, SWEDEN Tel: +46 8 556 002 03 Mob: +46 708204288 e-mail: gunnar.hellstrom@omnitor.se web: www.omnitor.se

-----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