This reports which hardware revision of the MUX board, v1 through v6, is installed, analogous to gnMdmStatXBoardType for the modem, again intended for NMS-side use in adapting behavior to the specific board capabilities. Later MUX board revisions typically support higher-capacity multiplexing options or additional connector types, so capacity-planning or upgrade-eligibility tools need this value to know what a given site's hardware can actually support. An audit identifying sites still on v2(3) MUX boards, versus newer v5(6) or v6(7) boards, would use this object to prioritize which sites need a hardware refresh before a planned capacity increase.