Transmission Lines Of Telephone Lines - Canon FACSIMILE BASIC 2000 Service Manual

1. TRANSMISSION LINES OF TELE-
PHONE LINES
Let's take a look at what is used as the transmission lines of an actual tele-
phone lines. Fig. A-1 shows the transmission lines of a hierarchical organi-
zation in Japan.
Fig. A-2 shows an organization and transmission lines of an international
telephone network.
A–2
Toll line
Local line
Fig. A-1 Transmission Lines of a Hierarchical Organization (example)
International
exchange
Domestic
telephone
network
Subscriber telephone
Fig. A-2 Organization and Transmission Lines of
an International Telephone Network
Regional
Center (RC)
4-wire coaxial cable
system/optical fiber
cable system or
District
Center (DC) microwave radio
relay system
Toll Center
(TC)
2-wire cable system
or 4-wire coaxial
cable system
End Office
(EO)
2-wire cable system
Subscriber
telephone
4-wire coaxial cable system,
Optical fiber cable system,
Microwave radio relay system,
Satellite communication system,
or Submarine cable system