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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