A power access service deploys GPON Type C dual-homing protection, and the state of the protection group and the uplink Ethernet port is determined on the OLT. When the state of the Ethernet port associated with the protection group on the OLT changes to down, which of the following descriptions is incorrect?

A power access service deploys GPON Type C dual-homing protection, and the state of the protection group and the uplink Ethernet port is determined on the OLT. When the state of the Ethernet port associated with the protection group on the OLT changes to down, which of the following descriptions is incorrect?
A . The state of the work port on the ONU side changes to standby
B. OLT communicates with ONU uplink status change
C. After switching, the service on the ONU is sent to the OLT through the protect port, that is, the service message is transmitted on the protect port
D. ONU detects link failure and triggers protection switching

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Answer: D