European Telecommunications -1 And -2, And Es 200 778-1 And -2, The Latter Replacing Ets 300 778-1 & -2) Allows 3 Physical Transport Layers (bellcore, Bt And Cca) Combined With 2 Data Formats ([[mdmf Articles about
 

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European Telecommunications -1 And -2, And Es 200 778-1 And -2, The Latter Replacing Ets 300 778-1 & -2) Allows 3 Physical Transport Layers (bellcore, Bt And Cca) Combined With 2 Data Formats ([[mdmf