The design is the visual features of the CONNECTION CABLE shown in the drawings, whether those features are features of one of shape, configuration, ornament or pattern, or are a combination of any of those features. A portion of the article is of variable length and, as such, break lines (jagged lines) are included in Figures 1, 2, 4, 6, 7, 8, 9, 11, 13, 14, 15, 16, 18, 20, 21, 22, 23, 25, 27 and 28. The drawings show four (4) variants.Figure 1 is a front perspective view of the first variant of the CONNECTION CABLE;Figure 2 is a first side view of the first variant thereof;Figure 3 is a front view of the first variant thereof;Figure 4 is a second side view of the first variant thereof; Figure 5 is a rear view of the first variant thereof;Figure 6 is a top view of the first variant thereof;Figure 7 is a bottom view of the first variant thereof;Figure 8 is a front perspective view of the second variant of the CONNECTION CABLE;Figure 9 is a first side view of the second variant thereof;Figure 10 is a front view of the second variant thereof;Figure 11 is a second side view of the second variant thereof; Figure 12 is a rear view of the second variant thereof;Figure 13 is a top view of the second variant thereof;Figure 14 is a bottom view of the second variant thereof;Figure 15 is a front perspective view of the third variant of the CONNECTION CABLE;Figure 16 is a first side view of the third variant thereof;Figure 17 is a front view of the third variant thereof;Figure 18 is a second side view of the third variant thereof; Figure 19 is a rear view of the third variant thereof;Figure 20 is a top view of the third variant thereof;Figure 21 is a bottom view of the third variant thereof;Figure 22 is a front perspective view of the fourth variant of the CONNECTION CABLE;Figure 23 is a first side view of the fourth variant thereof;Figure 24 is a front view of the fourth variant thereof;Figure 25 is a second side view of the fourth variant thereof; Figure 26 is a rear view of the fourth variant thereof;Figure 27 is a top view of the fourth variant thereof; andFigure 28 is a bottom view of the fourth variant thereof.Drawings of the design are included.