ctFnbConnect is a read-write enumerated value that reports, and lets an admin set, how this CSMA/CD board is physically wired into the chassis's inter-RIC backplane bus. Because the coded values group into "connect" (1, 2, 4), "subnet connect" (5, 6), a front-panel connection (8), or disconnect (3), an admin can see at a glance whether the board is bridged onto a backplane channel, only reachable via its front panel, or cut off entirely. For instance, seeing ctFnbConnect return disconnect(3) on a board that is supposed to be forwarding traffic tells the admin that board's inter-RIC bus link has been dropped and needs to be reconnected.