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650-754 - Advanced IP NGN Architecture System Engineer (PANGNSE)
What is the reason that OEO conversion is used?
Traffic analysis is easier with electrical signals, so OEO is introduced at every data communication junction point to conduct government oversight of traffic and potential corporate espionage.
OEO increases available fan-out and is used to increase the number of possible connections in access layer.
There are data rate benefits of electrical signals to prevent congestion on conversion points.
Historically, only short-reach wavelengths have been used between devices inside the POP environment and not DWDM wavelengths directly.
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