00497nam a2200145Ia 4500008004100000020001900041082001800060100001600078245007800094260003600172650002900208942000700237952009000244999001700334240817s9999    xx            000 0 und d  a 3-540-54819-x  a621.382 B63,i  aBocker , P. 0aI S D N The integrated services digital network concepts  methods systems  c1992a Berlinb Springer Verlag  a Electronics Engineering  cBK  00104070aTCLbTCLd2024-08-21l0o621.382 B63,ip44758r2024-08-21w2024-08-21yBK  c31077d31077