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Coaxial cable system
Coaxial cable, which is an assembly of coaxial pairs with relatively low
attenuation and superior high-frequency characteristics compared to 2-
wire cable, is used. Among its various methods, the FDM-FM method
which provides 1000 to 10000 channels, is adopted.
Microwave radio relay system
This system uses microwave radio in the 1 to 10 GHz band for transmis-
sion. FDM-DM is used as the modulation method.
Satellite communication system
This system refers communications via communications satellites.
Submarine coaxial cable system
This system refers to the coaxial cable that is load on the ocean floor. The
TASI (Time Assignment Speech Interpolation) system is used for efficient
use of the cables. However, the tip of the leading section of the signal may
be cut for the TASI system.
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