Bates, Regis J. <br/><br/>
Principles of voice and data communications 

 - Boston  McGraw-Hill  2007. 
 - xxiii; 782p.: ill. 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>9780072257328 
<br/><br/><label>LC Class. No.: </label>TK 5101   / bat2007