Basic training : ISDN  introduction to practical aspects 

 - New Delhi  Narosa Publishing House  1998 
 - 72p. : ill.  
<br/><br/><label>ISBN: </label>8173192499 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Integrated service digital networks<br/>ISDN<br/>ISDN -- Practical aspects