FIG. 1 is a front, bottom and left side perspective view of a USB hub, showing my new design;
FIG. 2 is a rear, top and right side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is an enlarged top plan view thereof; and,
FIG. 8 is an enlarged bottom plan view thereof.
The broken lines shown in the drawings illustrate portions of the USB hub that form no part of the claimed design.