Bellamy, John. , <br/><br/>
Digital telephony / 
John Bellamy. 
 - 2nd ed. 
<br/><br/><label>ISBN: </label>0471620564 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital telephone systems.
<br/><br/><label>LC Class. No.: </label>TK5103.7   / .B44 1991