Bellamy, John C. <br/><br/>
Digital Telephony / 
John C. Bellamy. 
 - 3rd ed. 
 - New Delhi :  Wiley,  c2000 [Reprint 2017]. 
 - xxv, 643 p. :  ill. ;  23 cm. 
<br/><br/>Includes index 
<br/><br/><label>ISBN: </label>9788126509294 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital telephone systems
<br/><br/><label>Dewey Class. No.: </label>621.385  / BED 2000