1-1 is just the number Linux gave to your device. It means, as far as I can tell, the device on the first port on the first USB bus (take a look at
lsusb to see if bus 001 is a 1.1 or 2.0 bus). On my machine, I see 1-2.1 and 1-2.2 (the keyboard and mouse plugged on both ports of the hub plugged on the second port of the first USB bus). Note that the same port is often on two buses, one 1.1 (OHCI or UHCI) and one 2.0 (EHCI), and which one is used depends on whether the device is high-speed (2.0 only) or full-speed/low-speed (1.1 or 2.0).
You can see more interesting information with
lsusb -v or
sudo lsusb -v.