We claim the ornamental design for a cover for data repeater, as shown and described.
FIG. 1 is the front perspective view of a cover for data repeater showing our new design;
FIG. 2 is the front view thereof;
FIG. 3 is the rear view thereof;
FIG. 4 is the left-side view thereof;
FIG. 5 is the right-side view thereof;
FIG. 6 is the top plan view thereof; and,
FIG. 7 is the bottom plan view thereof.
The broken lines in the drawings depict parts of the cover for data repeater that form no part of the claimed design. All unshaded surfaces between the broken and solid lines form no part of the claim.