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LTC4269-1 for LLDP protocol


According to LTC4269-1 datasheet,

a Type 2 PD must be able to recognize both layers of communications and identify a Type 2 PSE.

According to IEEE802.3at-2009,

Type 2 PDs implement both 2-Event Physical Layer classification (see and Data Link Layer
classification (see 33.6) and advertise a 2-Event class signature of 4.

Will LTC4269-1 recognize PSE through data layer negotiations ?

Or need change PSE register bit through Physical Layer ?

Thanks a lot !