Bellamy, John. <br/><br/>
Digital telephony / 
by John Bellamy. 
 - New York, N.Y. :  John Wiley & Sons,  1982. 
 - xviii, 526 p. 
<br/><br/> Includes bibliography and index. 
<br/><br/><label>ISBN: </label>0471080896 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communications.<br/>Digital modulation.<br/>Telephone switching systems, Electronic.