hwDehaPortClockMode shows or sets the port's clock source: system clock, line-derived clock, or SRTS (Synchronous Residual Time Stamp) clock recovery. An admin chooses this based on network synchronization needs, since srts is typically used to recover timing across an asynchronous transport when a direct line clock isn't available. For example, an admin deploying this DEHA port over an unstructured path without a reliable line clock might set hwDehaPortClockMode to srts(3) to recover timing at the far end.