Held, Gilbert <br/><br/>
Understanding data communications 

 - 5 
 - New Delhi  Techmedia  1996 
 - xv, 504p. : ill.  
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>8120310802 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Communication networks<br/>Computer networks<br/>Data communication