Held, Gilbert,  1943- <br/><br/>
Understanding data communications :   from fundamentals to networking / 
Gilbert Held 
 - 2nd ed. 
 - Chichester ; New York:   John Wiley & Sons,   1996 
 - xx, 728 p.:   ill., maps; 25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>047196820X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems<br/>Computer networks