Bates ,R .J <br/><br/>
Voice & Data Communications Hand Book  [Book]. 

 - 4 
 -  Tata Mcgraw-Hill 
<br/><br/> All. 
<br/><br/><label>ISBN: </label>70472815 
<br/><br/><label>Subjects--Topical Terms: </label><br/>The Engineering Hand Book