This object describes the connector type available for attaching an external clock source to port 2 of the PXM-UI-S3 back card, distinct from the primary port's connector type. An admin cares because it tells them what cabling hardware is needed specifically for the redundant timing port when planning a second external reference connection. For example, an admin adding a backup timing source to port 2 would check this object to confirm the correct connector before ordering cable.