2

Optical CATV 1  Optical CATV
CATV       
  CATV
  
   (RETRANSMISSION)   CATV  COAXIAL CABLE  TRUNK ROUTE 
  COAXIAL  MULTI CHANNEL
 TRUNK LINE  CATV        DATA BASE    IMAGE INFORMATION  2  (DUPLEX)

2  Optical LAN
     
 LAN 