Bellamy, John <br/><br/>
Digital telephony / 
John Bellamy 
 - New York :  Wiley,  1982 
 - 526 p. :  ill. ;  23 cm. 
<br/><br/>Includes index Bibliography : p.519-p.521 
<br/><br/><label>ISBN: </label>0471080896 
<br/><br/><label>LCCN: </label>81-11633 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communications<br/>Digital modulation<br/>Telephone switching systems, Electronic