Brother MFC-J6720DW - Manual (Page 211)

Specifications
197
D
Interfaces
D
1 Your machine has a USB 2.0 Hi-Speed interface. The machine can also be connected to a computer that has a USB
1.1 interface.
2 Third party USB ports are not supported.
3 See Network on page 198.
For more information, see Software and Network User’s Guide: Supported Protocols.
USB
1 2 Use a USB 2.0 interface cable that is no longer than 16 feet (5 m).
LAN
3 Use an Ethernet UTP cable category 5 or greater.
Wireless LAN IEEE 802.11b/g/n (Infrastructure/Ad-hoc Mode)
IEEE 802.11g/n (Wi-Fi Direct™)