Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so the router can be mounted in any rack that provides holes spaced at that distance.
RATED voltage is the voltage on the nameplate - the "design point" for maximum power throughput and safe thermal operation.
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
Current rating is the maximum current that a fuse will carry for an indefinite period without too much deterioration of the fuse element.
The “reduction” or gear ratio is calculated by dividing the number of teeth on the large gear by the number of teeth on the small gear.