The optical amplifier unit compensates for line losses and extends the transmission distance. Connecting multiple optical amplifier units in cascaded mode allows for extended transmission distances without following the system.
I'm not so sure about that. Doesn't the question mention something about 'without following the system'? There might be more to this than meets the eye.
Hmm, this one seems straightforward. I'll go with True. Optical amplifiers are designed to boost the signal, so connecting them in cascade should extend the transmission range.
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