What do you mean "network usb" as in Network-attached storage (NAS)? 3G usb adapter? WCN?
Please explain these features.
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Network USB
Select to share a USB printer, scanner, or storage device connected to the USB port behind the router with multiple users within your network.
Support
Device drivers and the D-Link USB Network Utility must be installed on each computer that will use the device.
3G USB Adapter
Select 3G USB Adapter to use a 3G adapter to provide access to the Internet using an EV-DO cellular signal. Simply connect a 3G USB adapter to access the Internet (third party EV-DO subscription and available signal required).
Support
If you have trouble accessing the Internet through the router. Double check the settings you entered on this page and verify with your Internet Service Provider (ISP) if needed.
WCN Configuration
Select to configure your wireless network using Windows Connect Now (WCN). WCN allows you to copy your wireless settings from the router to a USB flash drive and use to automatically configure the wireless settings on your computer(s) or other WCN-compatible devices.