Bellamy, John <br/><br/>
Digital telephony 

 - 2 
 - New York  John Wiley  1991 
 - xix, 572p. : ill. ;  
<br/><br/> Includes biliographical references and index. 
<br/><br/><label>ISBN: </label>471620564 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone systems -- Digital