eXtreme 6+ Category 6 110 to T568A Patch Cord, 4 pair, 3-foot Dependable, flexible, and cost-effective, Leviton 110-style and 66-block cross connect products are ideal for telecommunications rooms and distribution frames. 110-style wiring blocks are available in CAT 6A, 6, and 5e, and can be mounted to the wall or plywood backboard. Rack-mount solutions are also available.