Harte, Lawrence <br/><br/>
Introduction to public switched telephone networks (PSTNs) : POTS, ISDN, DLC, DSL, and PON technologies, systems and services 
Lawrence Harte, Robert Flood 
 - Second edition 
 - Fuquay-Varina, NC  Althos  c2005 
 - vi, 44 pages  illustrations  28 cm 
<br/><br/>Includes indexs and references 
<br/><br/><label>ISBN: </label>0974278769 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telecommunication systems