※ Reference
Although any of the signal level conversion methods as stated above is used, there are
many cases with problems occurring from the fact that the power supply (the grounding line
to be exact) for the transmission side is connected from a remote distance connection
through the communication line. Noises flown in through this grounding line might lead the
transmitting or receiving system to the instability. For such reasons, it is desirable to insulate
and separate the power supply for the system from the power supply for communication
line if it involves a long-distant transmission or it is used under the surrounding environment
with many noises to the communication system.
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