A dock-kit interface port on an in-tray of a mobile rack which includes casing, an interface circuit board mounted inside the casing and having an interface circuit, an in-tray connector soldered to the interface circuit board at one side and connected to an electric connector on the in-tray, and at least one interface connector soldered to the interface circuit board at an opposite side and adapted for connecting to a computer by a cable, a power connector mounted on the rear cover shell and connected to the interface circuit and adapted to receive power supply from a power supply outlet through a transformer circuit, a power switch mounted on the rear cover shell for power on/off control.
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