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Build the Best Data Center Facility for Your Business by Douglas Alger

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R
rack unit

A unit of measurement for the height of internal, installable space within a server cabinet or rack. 1 rack unit = 1.75 inches (4.45 centimeters). Abbreviated as U, as in “1U server” or “42U server cabinet.”

radio frequency interference (RFI)
See [electromagnetic interference (EMI)]
relative humidity

A percentage of how much water is in the air compared to how much water the air could hold at whatever temperature it happens to be when you measure it.

return loss

The ratio of an outgoing signal's power to that of a return signal caused by an impedance mismatch. The return signal is created when the outgoing signal encounters a jack or other piece of connecting hardware. Measured in decibels.

reverse fiber positioning

Installing a single ...

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