ecom case study_RAG_11 / 14 - ALL RIGHTS RESERVED 1 CaseStudy 1 The challenge Coal mines are well known for their harsh work environment including dirt, dust and extraordinary physical pressure and stress. Under these conditions, wireless mo- bile communication is difficult to re- alize. Furthermore, branches, curves & mine doors interfere with wireless devices which themselves have to ful- fil the requirements regarding explo- sion protection. Therefore, voice, data and video com- munication remain non-portable and wire-bound. Besides technical and lawful re- quirements, wireless mobile com- munication must fulfil economic requirements in order to increase ef- ficiency and therefore make German coal mining more competitive. The solution RAG introduces a computer based communic

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