This read-only integer reports the measured round-trip delay, in milliseconds, of the connection as determined by running the testdelay option of ausmChanTestType. Admins use this figure to assess latency on a specific PVC, useful for validating SLA commitments or diagnosing performance complaints tied to delay-sensitive applications. For example, an admin investigating a customer's complaint about voice quality on a PVC would run the delay test and check ausmChanRTDResult to see whether round-trip latency is abnormally high.