00564nam a2200193Ia 4500 6312 140320s9999 xx 000 0 und d 0-07-114430-7 PK-LaUMT 004.6 KES-I Kessler, Gary C. ISDN : concepts, facilities, and services Kessler, Gary C.<>Southwick, Peter V., Jt. Auth. New Delhi,India: McGraw-Hill, 1997. 672 p. EN Integrated services digital networks Southwick, Peter V., Jt. Auth. BK 7906 7906 0 0 ddc 0 0 01 01 2014-03-20 0 004.6 KES-I 6871 2014-03-20 00:00:00 2014-03-20 BK 0 0 ddc 0 0 01 01 2014-06-02 0 004.6 KES-I 15639 2014-06-02 00:00:00 2014-06-02 BK