This reports whether a specific channel in an Inverse Multiplexer group is active(2) or inactive(1); it is active only when both the group's admin status is enabled and the channel itself is operational. An admin uses this per-channel status to pinpoint which physical links within a bonded group are actually carrying traffic versus down or administratively disabled. For example, if a group shows three channels but only two report active(2), the admin knows one physical link has failed or is not yet operational even though the group itself remains enabled.