Held, Gilbert,  1943- <br/><br/>
Understanding data communications :  from fundamentals to networking / 
Gilbert Held 
 - 3rd ed. 
 - New York :  John Wiley & Sons,  2000 
 - xvi, 852 p. :  ill. ;  25 cm. 
<br/><br/> Includes index 
<br/><br/><label>ISBN: </label>0471627453  RM417.88 
<br/><br/><label>LCCN: </label>00-032094 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems<br/>Computer networks