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Standards [CURRENT]

DIN ETS 300085

Integrated Sevices Digital Network (ISDN); 3,1 kHz telephony teleservice; attachment requirements for handset terminals; english version ETS 300085:1990
Edition 1992-02

Standards [CURRENT]

DIN ETS 300192

Private Telecommunication Network (PTN); signalling protocol at the S-reference point; circuit mode basic services; English version ETS 300192:1992
Edition 1993-09

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