Brother FAX-2440C - Manual (Page 216)

SPECIFICATIONS S - 8
Interfaces
USB A Full-Speed USB 2.0 cable that is no longer than
6 feet (2.0m).*
LAN cable
(MFC-620CN only) Ethernet UTP cable category 5 or greater.
* Your machine has a Full-Speed USB 2.0 interface. This
interface is compatible with Hi-Speed USB 2.0; however, the
maximum data transfer rate will be 12 Mbits/s. The machine can
also be connected to a computer that has a USB 1.1 interface.