ISDN explained :  worldwide network and applications technology / 
John M. Griffiths with Peter Adams ... [et al.]. 
 - Chichester :  John Wiley & Sons,  1990. 
 - 175 p. :  ill. ;  26 cm. 
<br/><br/><label>ISBN: </label>0471926752 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Integrated services digital networks.