This object reports the interface type of a specific candidate clock source configured for T4 output selection, the T4-table equivalent of cnsInpSrcIntfType. It matters for the same interoperability-checking reason, confirming the type of signal, Ethernet or T1/E1, available to feed the T4 distribution path so an admin can match it against what downstream equipment expects. An admin building redundant T4 feeds would use this to confirm multiple, diverse interface types are configured rather than several sources sharing a single failure-prone medium.