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Canon fax basic 2000 Manuale Di Servizio

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BASIC OF TELEPHONE
1–18
In this way, a telephone network consists of telephones used as a terminal
for converting voice to electrical signals and electrical signal back again to
voice, a telephone line for transmitting electrical signals to places far away,
and an exchange system for connecting two telephones.
Telephone lines come in various types: coaxial cable, optical fiber cable,
microwaves communications satellites and submarine cable.
The places where the exchange system is located is called the telephone
center (or the exchange center).
Fig. 1-20   Telephone Network Organization
Telephone
Transit
exchange
Subscriber
exchange
Telephone
Transit
exchange
Subscriber
exchange
Micro
wa
ve
radio
rela
y system
Satellite
communication
system
Optical
fiber
cab
le/
Coaxial
cab
le
system
Electrical signal
Voice
Electrical signal
Voice
T
ransit
trunk
Subscriber
line
Submarine
cable system