This read-only octet string (up to 15 characters) reports the Destination Access Point Identifier actually being received right now on an OTUC3 (300 Gb/s-class flexible OTU) trunk port, as opposed to what was configured as expected. An administrator compares this live received value against the configured expected DAPI to confirm the signal is truly destined for this facility and not arriving from a misrouted path. For example, seeing an unexpected received DAPI on OTUC3 would tell an operator the incoming signal was intended for a different destination, pointing at a cross-connect or patching error upstream.