 Can I join CAT 6A cable? The standard advice with all structured cabling is that the cables should be a direct link with no joins. However, in some cases, there is no choice other than to join the cables. Therefore, it is possible to use an inline IDC connector. With an inline IDC connector, a junction box is used to permanently punch down two CAT 6A cables at opposite ends of the junction box. This box itself then creates the permanent join between the cables. When you use these types of connection boxes, the cable will still pass a Fluke certification test. It is not recommended to extend two CAT 6A cables for the patch lead and jacks or couplers. The patch lead creates an additional loss in the link and can cause the overall link to fail when testing.