International Telecommunication Union

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TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU

TELECOMMUNICATION
DEVELOPMENT SECTOR
OF ITU

RADIOCOMMUNICATION
SECTOR
OF ITU

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CAUTION !

PREPUBLISHED  RECOMMENDATION

This prepublication is an unedited version of a recently approved Recommendation. It will be replaced by the published version after editing. Therefore, there will be differences between this prepublication and the published version.

Recommendation  ITU‑{{ bureau }}  {{ docnumber }}