In, wavelength-division multiplexing (WDM) is a technology which a number of signals onto a single by using different (i.e., colors) of. This technique enables communications over a single strand of fiber (also called wavelength-division duplexing) as well as multiplication of capacity.
Having a PDU is not always necessary, but it can provide additional power distribution and monitoring capabilities in a data center or server room. Depending on the specific requirements and setu.