A GPON Type C dual-homing protection is deployed for a power access service, and the status of the protection group and the uplink Ethernet port is set on the OLT. When the status of the Ethernet port associated with the protection group on the OLT becomes down, which of the following description is incorrect?

A GPON Type C dual-homing protection is deployed for a power access service, and the status of the protection group and the uplink Ethernet port is set on the OLT. When the status of the Ethernet port associated with the protection group on the OLT becomes down, which of the following description is incorrect?
A . The status of the work port on the ONU side becomes standby
B . OLT general ONU uplink status changes
C . After the switch, the service on the ONU is sent to the OLT through the protect port, that is, the service message is transmitted on the protect link.
D . ONU detects link failure and triggers protection switching

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Answer: D