Held, Gilbert <br/><br/>
Voice & data internetworking / 
Gilbert Held 
 - 3rd ed. 
 - New York:  McGraw-Hill,   ©2001 
 - xviii, 397 pages :    illustrations ;  24 cm 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>9780072131833 (Pbk) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems
<br/><br/><label>Dewey Class. No.: </label>621.385  / HEL