EN 300 392-12-21 : 1.5.1现行
TERRESTRIAL TRUNKED RADIO (TETRA); VOICE PLUS DATA (V+D); PART 12: SUPPLEMENTARY SERVICES STAGE 3; SUB-PART 21: AMBIENCE LISTENING (AL)
出版：European Telecommunications Standards Institute
专家解读视频
Describes the stage 3 specification of the Supplementary Service Ambience Listening (SS-AL) for the Terrestrial Trunked Radio (TETRA).
DS EN 300392-12-21 : 2012 - Identical
NF EN 300392 12-21 : 2012 - Identical
DIN EN 300392-12-21 : 2014 - Identical
NBN EN 300 392 12-21 : 2012 - Identical
PN EN 300 392-12-21 : AUG 2012 - Identical
NEN EN 300392-12-21 : 2012 - Identical
