Uses for the USB port of AirPort Time Capsule, AirPort Extreme, AirPort Express
The USB port on a AirPort Time Capsule, AirPort Extreme Base Station, or AirPort Express is only intended for the uses described here. It is not intended for use with other USB devices, such as broadband modems, speakers, or keyboards.
AirPort Time Capsule 802.11ac & AirPort Time Capsule 802.11n (1st - 4th Generation)
A self-powered USB hard drive
A USB printer
A USB hub, which may be used to connect several USB hard drives and/or printers
AirPort Extreme 802.11ac & AirPort Extreme 802.11n (1st - 5th Generation)
A self-powered USB hard drive
A USB printer
A USB hub, which may be used to connect several USB hard drives and/or printers
AirPort Express 802.11n (2nd Generation) & AirPort Express 802.11n (1st Generation)
A USB printer
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Broadband modem note
To connect to a broadband modem, such as cable and DSL, use Ethernet. If your broadband Internet service provider uses USB modems, contact them for an alternate solution.