Griffiths, J. M. <br/><br/>
ISDN Explained:  networks and applications technology 

 - 2nd ed. 
 - New York.  John Wiley & Sons  1990. 
 - xiv; 239p.: ill. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISSN: </label>
<br/><br/><label>LC Class. No.: </label>TK 6103.7  / gri1990