Bellamy, John  1941- . <br/><br/>
Digital telephony 
John Bellamy. 
 - 2nd ed. 
 - New York  Wiley  1991. 
 - 572p.  ill.  25cm. 
<br/><br/><label>ISBN: </label>0471620564 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital telephone systems.