Open University T321 <br/><br/>
Telecommunication systems course :  units3-4. Channels and lines /  [Book]. 
Open University. 
 - Milton Keynes :   Open University Press,   1976. 
<br/><br/><label>ISBN: </label>0335061079 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication systems.