We claim the ornamental design for a connection cable, substantially as shown and described.
FIG. 1 is a perspective view of a connection cable showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIGS. 4 and 5 are side views thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a perspective view thereof.
The cable connection is shown with a break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.