Held, Gilbert,  1943- <br/><br/>
Understand data communications / 
Gilbert Held 
 - 7th ed 
 - Boston:  Addison-Wesley,   2002 
 - xv, 765 p.:   ill.;   24 cm 
<br/><br/> Includes glossary and index 
<br/><br/>Includes bibliographical references (p. 706-708) 
<br/><br/><label>ISBN: </label>0672322161 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems<br/>Computer networks