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What is the correlation between Stage 1, Stage 2 (GSM 3.90 and GSM 02.90) and Phase 1, Phase 2?

April 26, 2017correlation GSM phase Stage

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What is the correlation between Stage 1, Stage 2 (GSM 3.90 and GSM 02.90) and Phase 1, Phase 2?

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The “stage” nomenclature was an ancient CCITT invention, related to ISDN standardisation. “Stage 1” refers to the service description from a service-user’s point of view. “Stage 2” is a logical analysis, breaking the problem down into functional elements and the information flows amongst them. “Stage 3” is the concrete implementation of the protocols between physical elements onto which the functional elements have been mapped.