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List:       mpls
Subject:    Re: [mpls] Question for clarification on
From:       Huub van Helvoort <huubatwork () gmail ! com>
Date:       2011-10-31 13:59:39
Message-ID: 4EAEA9CB.8060809 () gmail ! com
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Yaacov, hi

You wondered:

> Question for my clarification about the MEG-ID format:
>
> When defining the MEG-ID the draft states - "followed by a
 > Unique MEG ID Code (UMC) as defined in [Y.1731_cor1]"
>
> The Corrigendum does not specify what the character set that
 > is used for the UMC is.  Could you please clarify what is the
 > character set that is used for the UMC?

The Corrigendum contains the following text:

"A.2 Global MEG ID format based on CC and ICC
Figure A-4 shows the format that uses the ITU Carrier Code (ICC)
with Country Code (CC). The MEG ID Value is identified by Type 33
and consists of 15 characters coded according to [ITU  T.50]."

and:

"The UMC code immediately follows the ICC and shall consist of
7-12 characters, with trailing NULLs, completing the 15-character
MEG ID Value."

So the UMC is part of the MEG ID which consists of 15 T.50 coded
characters.
T.50 describes a set of 128 characters (i.e. 7 bits per character)

> Assuming a ICC of 6 characters - what is the maximum number of
 > MEG-IDs supported by this format (dependent upon the character
 > set)?

In figure A-5 of the corrigendum you have seen that in case of a
6 character ICC the UMC consists of up to 7 characters.
The maximum number is then 7 characters of 7 bits = 2^49 MEG-IDs
per service provider.

> Thank you,

You're welcome, Huub.

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