As a global leader in the PC market, IBM develops, manufactures and markets cutting-edge, reliable, high-quality PC products and value-added professional services that provide customers around the world with smarter ways to be productive and competitive.This product is a 7- to 14-frame X-track cable.It is required when you have 1 to 6 frames and you want to add one frame for a total of 7 frames. Does not apply to a library that contains dual accessors.It is required when you have 1 to 6 frames and you want to add frames for a total of 8 to 14 frames. Does not apply to a library that contains dual accessors.It is required when you have 8 to 16 frames, when you have feature code 1816 or 9316 installed, and when you want to remove frames such that you have a total of 7 frames. Does not apply to a library that contains dual accessors.