00470pamaa2200157 4500 0000028971 20050922090000.0 0471979058 004.66 GRI TK5105.7 GRI GRIFFITHS ISDN explained : worldwide network and applications technology John M. Griffiths. 3rd ed. Chichester: John Wiley & Sons Ltd., 1998. xiv, 291p.; 24cm. Integrated services digital networks