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

 - 2nd ed. 
 - New York  John Wiley  1990 
 - xix,572p. 
<br/><br/><label>ISBN: </label>0471620564 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ELECTRICAL ENGINEERING
<br/><br/><label>Universal Decimal Class. No.: </label>621.395.721  / BEL