Shay, William A. <br/><br/>
Understanding data communications and networks / 
William A. Shay. 
 - Boston :  PWS,  c1995. 
 - xvi, 600 p. :  ill. (some col.) ;  24 cm. 
 - The PWS series in computer science. .
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical reference. 
<br/><br/><label>ISBN: </label>0534202446 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Data transmission systems.<br/>Computer networks.