Digital loop carrier systems  past, present & future  [videorecording] : 

 - 2 videocassettes (ca. 46 min. each) :  sd., col. ; 1  2 in. +  1 viewer's guide 
 - New transport technology series [videorecording] .
<br/><br/><label>ISBN: </label> RM836.46 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication.<br/>Multiplexing.<br/>Digital communications.