Helmers,Scotta <br/><br/>
Data communications  A beginner's guide to concepts and technology 

 - New Jersey  Prentice Hall  
 - Soft Binding  xiii      330 
<br/><br/><br/>English 
<br/><br/><label>Subjects--Topical Terms: </label>--Data,  communications
<br/><br/><label>Dewey Class. No.: </label>621.3981 HEL-D  / HEL-D