CCITT <br/><br/>
BLUE BOOK,VOLUME III,FASCICLE III.3: TRANSMISSION MEDIA CHARACTERISTICS RECOMMENDATIONS G.601-G.654 ( 

 - GENEVA  ITU  1989 
 -  129 
<br/><br/> SC-021 
<br/><br/><label>ISBN: </label>ERNET 
<br/><br/><label>Dewey Class. No.: </label>335