Does ADI PSE support LLDP protocol for classification

Hi Ken,

A PSE, referring to the entire device or switch, may declare the availability of high power by performing a multiple-event Physical Layer Classification using voltage pulses, or with Data Link Layer Classification (DLL), using data packets. PSE controllers exist on the physical layer and you can read more about physical layer classification in their respective datasheets. The LTC4274 and LTC4291-1/LTC4292 do not directly interface with the data layer.

Link Layer Discovery Protocol (LLDP) negotiations are handled by the PHYs and that information is relayed to the PSE controller through a Host Controller or microprocessor. Both the LTC4274 and LTC4291-1/LTC4292 PSE controllers have an I2C data interface, so that the Host Controller can use that interface to configure the PSE based on the LLDP negotiation.

The LTC4271 and LTC4291 software interface datasheets are available for request on Analog’s Software Request Form (http://analog.com/srf). These documents include information on the LTC4271’s and LTC4291’s register maps. You can also request the Semi-Auto software, which is example code for a system that could implement LLDP.

Best Regards,

Eric

Hi Ken,

A PSE, referring to the entire device or switch, may declare the availability of high power by performing a multiple-event Physical Layer Classification using voltage pulses, or with Data Link Layer Classification (DLL), using data packets. PSE controllers exist on the physical layer and you can read more about physical layer classification in their respective datasheets. The LTC4274 and LTC4291-1/LTC4292 do not directly interface with the data layer.

Link Layer Discovery Protocol (LLDP) negotiations are handled by the PHYs and that information is relayed to the PSE controller through a Host Controller or microprocessor. Both the LTC4274 and LTC4291-1/LTC4292 PSE controllers have an I2C data interface, so that the Host Controller can use that interface to configure the PSE based on the LLDP negotiation.

The LTC4271 and LTC4291 software interface datasheets are available for request on Analog’s Software Request Form (http://analog.com/srf). These documents include information on the LTC4271’s and LTC4291’s register maps. You can also request the Semi-Auto software, which is example code for a system that could implement LLDP.

Best Regards,

Eric